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Scan Lenses for OCT Imaging


  • Optimized for OCT Laser Scanning Systems
  • Telecentric Scanning Objectives with a Flat Image Plane
  • Minimal Optical Aberrations and Low F-Theta Distortion
  • Large Maximum Fields of View up to 28.9 by 28.9 mm2

LSM02

1250 to 1380 nm
EFL = 18 mm 

LSM54-850

750 to 950 nm
EFL = 54 mm 

LSM04

1250 to 1380 nm
EFL = 54 mm 

LSM03-VIS

400 to 700 nm
EFL = 39 mm 

LSM54-1050

950 to 1150 nm
EFL = 54 mm 

Related Items


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Click on the red Document icon next to the item numbers below to access the Zemax file download. Our entire Zemax Catalog is also available.

Features

  • Flat Image Plane
  • Minimal Optical Aberration Over Image Plane (See Specs Tab for Details)
  • Large Field of View
  • Low F-Theta Distortion
  • Easily Incorporated into Custom-Built Microscopy Systems
  • Dispersion Compensators Available Separately for LSM02(-BB), LSM03(-BB), LSM03-VIS, LSM04(-BB), and LSM05(-BB)
Scan Lens Quick Links
Wavelength Item #
400 to 700 nm LSM03-VIS
750 to 950 nm LSM54-850
810 to 890 nm; 
1000 to 1100 nm
LSM02-BB, LSM03-BB,
LSM04-BB, and LSM05-BB
950 to 1100 nm LSM54-1050
1200 to 1400 nm LSM54-1310
1250 to 1380 nm LSM02, LSM03, LSM04, and LSM05

Thorlabs' LSM scan lenses are optimized for Optical Coherence Tomography (OCT) laser scanning imaging systems. Telecentric scan lenses are crucial for OCT and other laser scanning imaging systems, as they produce a flat imaging plane as a laser beam is scanned across the sample. A low f-theta distortion creates geometrically correct scanned images that do not require extensive post-image processing. A telecentric scan lens path can also maximize the captured scattered or emitted light from the sample (the signal) into the detection system. In addition, the spot size and shape vary minimally over the entire FOV (see Specs tab), which results in nearly constant image resolution.

These scan lenses operate over wavelength ranges centered on the popular OCT wavelengths of 633, 850, 1050, or 1315 nm. They offer a selection of effective focal lengths, fields of view, depths of view, and related parameters. All have AR coatings designed to minimize back reflections from broadband light sources.

The LSM02-BB, LSM03-BB, LSM04-BB, and LSM05-BB lenses have been designed to support operation around both 850 and 1050 nm, and therefore several system parameters have been specified (see the Specs tab) at 850 nm and 1050 nm.

The LSM54-850, LSM54-1050, and LSM-1310 scan lenses are optimized for operation around 850, 1050, and 1300 nm, respectively. Their large 6 mm entrance pupils and ±14° scan angles (single-axis scan) make them ideal for use with larger galvo mirrors that produce more highly deflected beams. The LSM54-850, LSM54-1050, and LSM54-1310 scan lenses have also been optimized to provide a flat field of view, and they are corrected for chromatic aberrations across their wide 200 nm band of operating wavelengths. Please see the Specs tab for detailed information.

Click on the links in the table to the right to jump to lenses of interest, or scroll down the page.

Specifications

The complete specifications available for each scan lens are provided in the tables below, and definitions of the various parameters follow the tables. Click the blue icons, info icon, to view the plots.

Lenses with Wavelength Ranges Between 400 and 1150 nm

Item # LSM03-VIS LSM54-850 LSM02-BB LSM03-BB LSM04-BB LSM05-BB LSM54-1050
Optical Specifications
Wavelength Range 400 to 700 nm 750 to 950 nm 810 to 890 nm and 1000 to 1100 nm 950 to 1150 nm
Effective Focal Length 39 mm 54 mm 18 mm 36 mm 54 mm 110 mm 54 mm
Entrance Pupil Diametera 4 mm 6 mm 4 mm 8 mm 6 mm
Parfocal Distance 50.7 mm 112 mm 30.7 mm 50.5 mm 80.7 mm 154.8 mm 112 mm
Lens Working Distance 25.1 mm 64 mm 7.5 mm 25.1 mm 42.3 mm 93.8 mm 64 mm
Scanning Distanceb 29.0 mm ± 5 mm 17.5 mm ± 7.3 mm 16.1 mm ± 5 mm 18.9 mm ± 5 mm 18.9 mm ± 5 mm 75.5 mm ± 5 mm 17.5 mm ± 7.3 mm
Optical Scan Anglec
(Single-Axis Scan)
Maximum ±10.6° ±14.0° ±10.6° ±10.6° ±10.6° ±10.6° ±14.0°
Diffraction Limited ±8.4° (543 nm) ±13.6° ±10.2° (850 nm)
±10.6° (1050 nm)
±9.0° (850 nm)
±9.7° (1050 nm)
±10.6° (850 nm)
±10.6° (1050 nm)
±7.2° (850 nm)
±8.1° (1050 nm)
±14.0°
Optical Scan Anglec
(Two-Axis Scan)
Maximum ±7.5° x ±7.5°  ±10.0° x ±10.0° ±7.5° x ±7.5° ±7.5° x ±7.5° ±7.5° x ±7.5° ±7.5° x ±7.5° ±10.0° x ±10.0°
Diffraction Limited ±5.1° x ±5.1°
(543 nm)
±8.4° x ±8.4° ±5.1° x ±5.1°
(850 nm)
±5.9° x ±5.9°
(1050 nm)
±6.3° x ±6.3°
(850 nm)
±6.8° x ±6.8°
(1050 nm)
±7.5° x ±7.5°
(850 nm)
±7.5° x ±7.5°
(1050 nm)
±4.9° x ±4.9°
(850 nm)
±5.5° x ±5.5°
(1050 nm)
±9.5° x ±9.5°
Spot Size Plotsa
Two-Axis Scan: 

Single-Axis Scan:
Two-Axis Scan:

Single-Axis Scan:
Two-Axis Scan:
850 nm:
1050 nm:

Single-Axis Scan:
850 nm:
1050 nm:
Two-Axis Scan:
850 nm:
1050 nm:

Single-Axis Scan:
850 nm:
1050 nm:
Two-Axis Scan:
850 nm:
1050 nm:

Single-Axis Scan:
850 nm:
1050 nm:
Two-Axis Scan:
850 nm:
1050 nm:

Single-Axis Scan:
850 nm:
1050 nm:
Two-Axis Scan:

Single-Axis Scan:
Minimum Spot Sizea
(Diffraction Limited)
10 µm (546 nm)  14 µm 7 µm (850 nm)
9 µm (1050 nm)
14 µm (850 nm)
18 µm (1050 nm)
21 µm (850 nm)
26 µm (1050 nm)
22 µm (850 nm)
27 µm (1050 nm)
18 µm
Field of Viewd
(Two-Axis Scan)
Maximum 10.3 x 10.3 mm2 18.8 x 18.8 mm2 4.7 x 4.7 mm2 9.4 x 9.4 mm2 14.1 x 14.1 mm2 28.9 x 28.9 mm2 18.8 x 18.8 mm2
Diffraction Limited 6.9 x 6.9 mm2 15.8 x 15.8 mm2 3.2 x 3.2 mm2
(850 nm)
3.7 x 3.7 mm2
(1050 nm)
7.9 x 7.9 mm2
(850 nm)
8.6 x 8.6 mm2
(1050 nm)
14.1 x 14.1 mm2
(850 nm)
14.1 x 14.1 mm2
(1050 nm)
18.8 x 18.8 mm2
(850 nm)
21.1 x 21.1 mm2
(1050 nm)
18.0 x 18.0 mm2
Depth of Viewd 
(Twice Rayleigh Length)
0.15 mm 0.17 mm 0.04 mm (850 nm)
0.05 mm (1050 nm)
0.18 mm (850 nm)
0.22 mm (1050 nm)
0.39 mm (850 nm)
0.49 mm (1050 nm)
0.41 mm (850 nm)
0.51 mm (1050 nm)
0.22 mm
F-Theta Distortiond <1% <0.3% <0.9% <0.2% <1.1% <0.4% <0.25%
Field Curvature <0.3 mm <0.3 mm <0.1 mm <0.2 mm <0.2 mm <0.5 mm <0.3 mm
Axial Color 60 µm
(400 to 700 nm)
210 µm
(750 to 950 nm)
5 µm
(810 to 890 nm)
10 µm
(1000 to 1100 nm)
15 µm
(810 to 890 nm)
10 µm
(1000 to 1100 nm)
30 µm
(810 to 890 nm)
10 µm
(1000 to 1100 nm)
30 µm
(810 to 890 nm)
150 µm
(1000 to 1100 nm)
50 µm
(950 to 1150 nm)
Lateral Color Shift 15 µm
(400 to 700 nm)
5 µm
(750 to 950 nm)
5 µm
(810 to 890 nm)
5 µm
(1000 to 1100 nm)
10 µm
(810 to 890 nm)
10 µm
(1000 to 1100 nm)
20 µm
(810 to 890 nm)
20 µm
(1000 to 1100 nm)
10 µm
(810 to 890 nm)
30 µm
(1000 to 1100 nm)
30 µm
(950 to 1150 nm)
f/# 9.8 9.0 4.5 9.0 13.5 13.8 9.0
Transmittance - -
Reflectance - -
Dimensional Specifications
Mounting Thread (External) M25 x 0.75 M25 x 0.75 M25 x 0.75 SM2 (2.035"-40) M25 x 0.75
Thread Length 4.4 mm (0.17") 4.7 mm (0.19") 4.4 mm (0.17") 4.5 mm (0.18") 4.7 mm (0.19") 5.5 mm (0.22") 4.7 mm (0.19")
Barrel Diameter 34 mm (1.35") 43.0 mm (1.40") 33 mm (1.30") 34 mm (1.35") 34 mm (1.35") 59.5 mm (2.34") 43.0 mm (1.40")
Length of Barrel 25.5 mm (1.00") 48.0 mm (1.89") 23.2 mm (0.91") 25.5 mm (1.00") 38.25 mm (1.51") 61.0 mm (2.40" 48.0 mm (1.89")
  • The beam at the entrance pupil is assumed to be Gaussian, and the entrance pupil is assumed to be the 1/e2 diameter of the Gaussian beam. A mirror separation of 14.7 mm is assumed for the LSM54-850 and LSM54-1050 lenses, while one of 10 mm is assumed for the LSM03-VIS, LSM02-BB, LSM03-BB, LSM04-BB, and LSM05-BB lenses. 
  • Distance from Pupil Position to the Base of the Mounting Threads (See Diagram Below)
  • Defined with Respect to the Optical Axis of the Lens
  • At the Center Wavelength, Unless Noted Otherwise

Lenses with Wavelength Ranges Between 1200 and 1400 nm

Item # LSM54-1310 LSM02 LSM03 LSM04 LSM05
Optical Specifications
Wavelength Range 1200 to 1400 nm 1250 to 1380 nm
Effective Focal Length 54 mm 18 mm 36 mm 54 mm 110 mm
Entrance Pupil Diametera 6 mm 4 mm 8 mm
Parfocal Distance 112 mm 30.7 mm 50.6 mm 80.8 mm 154.8 mm
Lens Working Distance 64 mm 7.5 mm 25.1 mm 42.3 mm 93.8 mm
Scan Distanceb 17.5 mm ± 7.3 mm 16.1 mm ± 5 mm 18.9 mm ± 5 mm 18.9 mm ± 5 mm 75.5 mm ± 5 mm
Optical Scan Anglec
(Single-Axis Scan)
Maximum ±14.0°  ±10.6° ±10.6° ±10.6° ±10.6°
Diffraction Limited ±14.0°  ±10.6° ±10.6° ±10.6° ±9.0°
Optical Scan Anglec
(Two-Axis Scan)
Maximum ±10.0° x ±10.0° ±7.5° x ±7.5° ±7.5° x ±7.5° ±7.5° x ±7.5° ±7.5° x ±7.5°
Diffraction Limited ±10.0° x ±10.0° ±6.7° x ±6.7° ±7.4° x ±7.4° ±7.5° x ±7.5° ±6.2° x ±6.2°
Spot Size Plotsa 
Two-Axis Scan:

Single-Axis Scan:
Two-Axis Scan

Single-Axis Scan:
Two-Axis Scan

Single-Axis Scan:
Two-Axis Scan

Single-Axis Scan:
Two-Axis Scan

Single-Axis Scan:
Minimum Spot Sizea 
(Diffraction Limited)
22 µm 11 µm (1300 nm) 22 µm (1300 nm) 33 µm (1300 nm) 34 µm (1300 nm)
Field of Viewd
(Two-Axis Scan)
Maximum 18.8 x 18.8 mm2 4.7 x 4.7 mm2 9.4 x 9.4 mm2 14.1 x 14.1 mm2 28.9 x 28.9 mm2
Diffraction Limited 18.8 x 18.8 mm2 4.2 x 4.2 mm2 9.3 x 9.3 mm2 14.1 x 14.1 mm2 23.8 x 23.8 mm2
Depth of Viewd 
(Twice Rayleigh Length)
0.27 mm 0.07 mm  0.27 mm  0.61 mm  0.63 mm 
F-Theta Distortiond <0.25% <0.9% <0.2% <1.1% <0.4%
Field Curvature <0.3 mm <0.1 mm <0.2 mm <0.2 mm <0.5 mm
Axial Color 200 µm
(1200 to 1400 nm)
25 µm
(1250 to 1380 nm)
5 µm
(1250 to 1380 nm)
50 µm
(1250 to 1380 nm)
300 µm
(1250 to 1380 nm)
Lateral Color Shift 50 µm
(1200 to 1400 nm)
10 µm
(1250 to 1380 nm)
10 µm
(1250 to 1380 nm)
25 µm
(1250 to 1380 nm)
60 µm
(1250 to 1380 nm)
f/# 9.0 4.5 9.0 13.5 13.8
Transmittance -
Reflectance -
Dimensional Specifications
Mounting Thread (External) M25 x 0.75 M25 x 0.75 SM2 (2.035"-40)
Thread Length 4.7 mm (0.19") 4.4 mm (0.17") 4.5 mm (0.18") 4.7 mm (0.19") 5.5 mm (0.22")
Barrel Diameter 43.0 mm (1.40") 33 mm (1.30") 34 mm (1.35") 34 mm (1.35") 59.5 mm (2.34")
Length of Barrel 48.0 mm (1.89") 23.2 mm (0.91") 25.5 mm (1.00") 38.25 mm (1.51") 61.0 mm (2.40")
  • The beam at the entrance pupil is assumed to be Gaussian, and the entrance pupil is assumed to be the 1/e2 diameter of the Gaussian beam. A mirror separation of 14.7 is assumed for the LSM54-1310 and LSM05 lenses, and one of 10 mm is assumed for the LSM02, LSM03, and LSM04 lenses.
  • Distance from Pupil Position to the Base of the Mounting Threads (See Diagram Below)
  • Defined with Respect to the Optical Axis of the Lens
  • At the Center Wavelength, Unless Noted Otherwise

 

Definitions of Key Parameters

Scan Lens Schematic
    Entrance Pupil Size (EP): If a single galvo mirror is used, the Entrance Pupil (EP), also known as the back aperture, is located at the pivot point of the mirror. When two mirrors are used, the EP is located between the mirrors. The size of the EP specifies the diameter of the collimated laser beam that will maximize the resolution of the imaging system.


    Scanning Distance (SD): The SD is the distance between the aperture plane, where the EP lies, and the back mounting plane of the objective, which is defined as the base of the mounting threads. For these lenses, the mounting plane is the shoulder adjacent to the threads, or thread mounting plane, of the lens. When two galvo mirrors are used, the aperture plane occurs midway between the two mirrors. When one galvo mirror is used, the pivot point of the single mirror coincides with the aperture plane. See the Application Info tab for more details.


    Scan Angle (SA): After being routed from the galvo mirror(s) the laser beam is incident on the lens at an angle. This angle, defined with respect to the optical axis of the lens, is the scan angle. When listed in the specification table, it indicates the range of maximum allowed scan angles.


    Parfocal Distance (PD): The PD is the distance from the scan lens mounting plane to the front focal plane of the scan lens.


    Working Distance (WD or LWD): The distance between the tip of the scan lens housing and the front focal plane of the scan lens is defined as the WD.


    Field of View (FOV): The FOV is the maximum size of the area on the sample that can be imaged with a resolution equal to or better than the stated resolution of the scan lenses. This assumes the proper utilization of the scan lenses in the optical system. During operation, the spot positions scan through the FOV. 


    Depth of View (DOV): The DOV parameter corresponds to the distance between the parallel planes on either side of the front focal plane where the beam spot diameter is √2 greater than it is at the front focal plane. This parameter is of interest when tube lenses are not used in the optical system design and the front focal place is also the sample plane, as is generally the case for OCT. When a tube lens is paired the scan lens, the image plane is located between the scan and the tube lens; the depth of field at the sample is then controlled by the microscope objective.

     

    Spot Size Data 

    Spot sizes formed in the image plane are typically of more interest to OCT system design than to other laser scanning microscopy system designs. This is because in most OCT systems the image plane is also the sample plane. In other laser scanning applications, scan lenses are routinely paired with tube lenses and the image plane of the scan lens does not coincide with the sample plane.

    Spot size plots for these lenses may be viewed by clicking on the blue icons, info icon, in the preceding tables. Spot size data are calculated for simulated two-axis and single-axis scans; for the two-axis case a system with two galvo mirrors is simulated, and for the single-axis case a system with a single galvo mirror is simulated. The location of the entrance pupil, which is positioned at the aperture plane, varies depending on whether one or two mirrors are used. When two galvo mirrors are used, the aperture plane is located midway between two galvo mirrors, as is shown in the right image of the Application Info tab. When a single galvo mirror is used, the aperture plane falls at the pivot point of the mirror, as is shown in the left image of the Application Info tab. 

    The two-axis scan gives detailed information about the variation in spot size and spot position over an entire two-dimensional range of scan angles; spot sizes over entire image plane are plotted. These data are calculated for a single wavelength (the center wavelength of the lens) and presented as a 3D plot, with the spot size data plotted on the vertical axis.

    The 2D single-axis scan graph contains three curves corresponding to: the center wavelength, the minimum specified wavelength, and the maximum specified wavelength. Together they illustrate the dependence of spot size on wavelength. The single-axis scan graphs plot spot size and spot position over a one-dimensional range of scan angles; the spot positions scan a line through the image plane. Because the aperture plane is not located in the same place for the Two-Axis and Single-Axis Scan plots, the data in the Single-Axis plot is not an exact cross section of the Two-Axis Scan plot data. The single-axis scan data were simulated using a system focused at the center wavelength of the lens; the system was not individually focused at each of the three wavelengths.

    In optical coherence tomography (OCT) and other laser scanning and imaging systems, a laser beam incident on the back aperture (entrance pupil) of the lens is scanned through a range of angles. This translates the position of the spot formed in the image plane across the lens' field of view. In the case of non-telecentric lenses, this approach to scanning the focal spot through the image plane would introduce severe aberrations that would significantly degrade the quality of the resulting image. Telecentric scan lenses are designed to create a uniform spot size in the image plane at every scan position, which allows a high-quality image of the sample to be formed. Plots showing the spot size and scan position as a function of scan angle are included in the Specs tab.

    In general, laser scanning microscopy systems pair a scan lens with a tube lens to create an infinity-corrected optical system. However, most OCT systems are designed to use the scan lens without a tube lens, so that the image plane of the lens coincides with the sample plane. The following discussion assumes the optical system design does not include a tube lens. 

    When designing an imaging system that uses an LSM scan lens in an OCT configuration, it is important to accommodate the design wavelength, parfocal distance, scanning distance, entrance pupil, and scan angle specifications in order to maximize the image quality (see the Specs tab for scan lens specifications and definitions). As an example, the larger the input beam diameter, the smaller the focused spot size. However, due to the effects of vignetting and/or increased aberrations, the range of scan angles decreases as the diameter of the beam increases. Beams smaller than the entrance pupil specification will result in spot sizes larger than those specified in the Specs tab, and beams with larger diameters will be clipped.

    For imaging systems with a single galvo mirror the center of the scan lens' entrance pupil is coincident with the pivot point of the galvo mirror. When a single galvo mirror is used, the scanning distance is measured from the mounting surface of the lens to the pivot point of the mirror. This is shown in the image at bottom-left.

    If the imaging system uses two galvo mirrors (one to scan in the X direction and one to scan in the Y direction), the entrance pupil is located between the two galvo mirrors, as is shown in the image at bottom-right. The scanning distance is then the distance from the mounting surface of the lens to the pivot point of the mirror closest to the lens (d1) plus the distance from the pivot point of that mirror to the entrance pupil (d2). It is important to minimize the distance between the two galvo mirrors, because when the entrance pupil and beam steering pivot point are not coincident, the quality of the image is degraded. This is principally due to the variation in the optical path length as the beam is scanned over the sample. Below are schematics for an imaging system containing one and two galvo mirrors.

    2d galvo mirror schematic
    When one galvo mirror is used, the entrance pupil is located
    at the pivot point of the mirror.
    1d galvo mirror setup
    When two galvo mirrors are used, the entrance pupil is located between the mirrors.

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    400 to 700 nm Wavelength Range

    Key Specificationsa,b
    Wavelength Range 400 to 700 nm
    Effective Focal Length 39 mm
    Lens Working Distance 25.1 mm
    Field of View, Maximum 10.3 x 10.3 mm2
    Field of View, Diffraction Limited 6.9 x 6.9 mm2
    Spot Size Plot, 543 nm
    (Two-Axis Scan)
    Reflectance
    Mounting Threads (External) M25 x 0.75
    • For detailed specs, please refer to the Specs tab.
    • Click the blue icons, info icon, to view the plots.
    • 550 nm Center Wavelength 
    • Entrance Pupil: 4 mm
    • Scan Angle Range: ±10.6° (Maximum, Single Axis)
    • External M25 x 0.75 Mounting Threads

    The LSM03-VIS scan lens is designed and AR coated for imaging over the visible wavelength range (400 to 700 nm). Key specifications for this lens are listed to the right; see the Specs tab for complete specifications.

    The external M25 × 0.75 threading can be adapted to Thorlabs' standard SM1 (1.035"-40) threading by using an SM1A12 adapter. An RMSA2 adapter allows the scan lens to be used with RMS-threaded (0.800"-36) components.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    LSM03-VIS Support Documentation
    LSM03-VISScan Lens, 400 to 700 nm, EFL=39 mm
    $1,036.66
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    750 to 950 nm Wavelength Range, Large Field of View

    Key Specificationsa,b
    Wavelength Range 750 to 950 nm
    Effective Focal Length 54 mm
    Lens Working Distance 64 mm
    Field of View, Maximum 18.8 x 18.8 mm2
    Field of View, Diffraction Limited 15.8 x 15.8 mm2
    Spot Size Plot, 850 nm
    (Two-Axis Scan)
    Transmittance
    Mounting Threads (External) M25 x 0.75
    • For detailed specs, please refer to the Specs Tab.
    • Click the blue icons, info icon, to view the plots.
    • 850 nm Center Wavelength
    • Large Entrance Pupil: 6 mm
    • Wide Scan Angle Range: ±14.0° (Maximum, Single Axis)
    • Large Maximum Field of View: 18.8 x 18.8 mm2
    • Minimum Spot Size: 14 µm at 850 nm (See Table at Right)

    Compared with many of our other LSM scan lenses, the LSM54 lenses, with their larger entrance pupils and range of scan angles, offer better compatibility with galvo mirrors that are larger and produce more highly deflected beams. Other features made possible through optimized optical design and an increased number of refractive elements include improved chromatic correction and the ability to operate over a wide spectral range. For systems operating in the 950 to 1150 nm or 1200 to 1400 nm wavelength ranges, the LSM54-1050 or LSM54-1310 lenses, respectively, provide similar performance.

    The table at right includes key specifications for the LSM54-850 lens, including a representative plot showing the small spot size and the spot position in the image plane as a function of all scanned angles at a wavelength of 850 nm. Click on the blue icons, info icon, to view the spot size and transmittance plots. For additional specifications, please see the Specs tab.

    The external M25 × 0.75 threading can be adapted to Thorlabs' standard SM1 (1.035"-40) threading by using an SM1A12 adapter. An RMSA2 adapter allows the scan lens to be used with RMS-threaded (0.800"-36) components.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    LSM54-850 Support Documentation
    LSM54-850Scan Lens, 750 to 950 nm, EFL=54 mm
    $1,659.97
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    810 nm to 890 nm and 1000 to 1100 nm Dual Wavelength Bands

    Key Specificationsa,b
    Item # LSM02-BB LSM03-BB LSM04-BB LMS05-BB
    Wavelength Range    810 to 890 nm and
    1000 to 1100 nm
    Effective Focal Length 18 mm 36 mm 54 mm 110 mm
    Lens Working Distance 7.5 mm 25 mm 42 mm 94 mm
    Field of View, Maximum 4.7 x 4.7 mm2 9.4 x 9.4 mm2 14.1 x 14.1 mm2 28.9 x 28.9 mm2
    Field of View,
    Diffraction Limited
    3.2 x3.2 mm2
    (850 nm)
    3.7 x 3.7 mm2
    (1050 nm)
    7.9 x 7.9 mm2
    (850 nm)
    8.6 x 8.6 mm2
    (1050 nm)
    14.1 x 14.1 mm2
    (850 nm)
    14.1 x 14.1 mm2
    (1050 nm)
    18.8 x 18.8 mm2
    (850 nm)
    21.1 x 21.1 mm2
    (1050 nm)
    Spot Size Plot, 850 nm
    (Two-Axis Scan)
    Spot Size Plot, 1050 nm
    (Two-Axis Scan)
    Reflectance
    Mounting Thread (External) M25 x 0.75 SM2 (2.035"-40)
    • For detailed specs, please refer to the Specs Tab.
    • Click the blue icons, info icon, to view the plots.
    • Center Wavelengths at 850 and 1050 nm
    • Scan Angle Range: ±10.6° (Maximum, Single Axis)
    • Range of Effective Focal Length Options from 18 to 110 mm

    The performance of these lenses has been optimized for wavelength bands around 850 and 1050 nm, two popular wavelengths for OCT. Selected specifications are quoted in the table at right. For additional specifications, please see the Specs tab.

    The external M25 × 0.75 threading can be adapted to Thorlabs' standard SM1 (1.035"-40) threading by using an SM1A12 adapter. An RMSA2 adapter allows the scan lens to be used with RMS-threaded (0.800"-36) components.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    LSM02-BB Support Documentation
    LSM02-BBScan Lens, 810 to 890 nm and 1000 to 1100 nm Dual Wavelength Bands, EFL=18 mm
    $1,715.16
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    LSM03-BB Support Documentation
    LSM03-BBScan Lens, 810 to 890 and 1000 to 1100 nm Dual Wavelength Bands, EFL=36 mm
    $1,081.04
    Today
    LSM04-BB Support Documentation
    LSM04-BBCustomer Inspired! Scan Lens, 810 to 890 and 1000 to 1100 nm Dual Wavelength Bands, EFL=54 mm
    $1,070.21
    Today
    LSM05-BB Support Documentation
    LSM05-BBCustomer Inspired! Scan Lens, 810 to 890 and 1000 to 1100 nm Dual Wavelength Bands, EFL=110 mm
    $1,070.21
    Today

    950 to 1150 nm Wavelength Range, Large Field of View

    Key Specificationsa,b
    Wavelength Range 950 to 1150 nm
    Effective Focal Length 54 mm
    Lens Working Distance 64 mm
    Field of View, Maximum 18.8 x 18.8 mm2
    Field of View, Diffraction Limited 18.0 x 18.0 mm2
    Spot Size Plot, 1050 nm
    (Two-Axis Scan)
    Transmittance
    Mounting Threads (External) M25 x 0.75
    • For detailed specs, please refer to the Specs Tab.
    • Click the blue icons, info icon, to view the plots. 
    • 1050 nm Center Wavelength
    • Large Entrance Pupil: 6 mm
    • Wide Scan Angle Range: ±14.0° (Maximum, Single Axis)
    • Large Maximum Field of View: 18.8 x 18.8 mm2
    • Minimum Spot Size: 18 µm at 1050 nm (See Table at Right)

    Compared with many of our other LSM scan lenses, the LSM54 lenses, with their larger entrance pupils and range of scan angles, offer better compatibility with galvo mirrors that are larger and produce more highly deflected beams. Other features made possible through optimized optical design and an increased number of refractive elements include improved chromatic correction and the ability to operate over a wide spectral range. For systems operating in the 750 to 950 nm or 1200 to 1400 nm wavelength ranges, the LSM54-850 or LSM54-1310 lenses, respectively, provide similar performance.

    The table at right includes key specifications for the LSM54-1050 lens, including a representative plot showing the small spot size and the spot position in the image plane as a function of all scanned angles at a wavelength of 1050 nm. Click on the blue icons, info icon, to view the spot size and transmittance plots. For additional specifications, please see the Specs tab.

    The external M25 × 0.75 threading can be adapted to Thorlabs' standard SM1 (1.035"-40) threading by using an SM1A12 adapter. An RMSA2 adapter allows the scan lens to be used with RMS-threaded (0.800"-36) components.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    LSM54-1050 Support Documentation
    LSM54-1050Scan Lens, 950 to 1150 nm, EFL=54 mm
    $1,659.97
    Today

    1200 to 1400 nm Wavelength Range, Large Field of View

    Key Specificationsa,b
    Wavelength Range 1200 to 1400 nm
    Effective Focal Length 54 mm
    Lens Working Distance 64 mm
    Field of View, Maximum 18.8 x 18.8 mm2
    Field of View, Diffraction Limited 18.8 x 18.8 mm2
    Spot Size Plot, 1300 nm
    (Two-Axis Scan)
    Transmittance
    Mounting Threads (External) M25 x 0.75
    • For detailed specs, please refer to the Specs Tab.
    • Click the blue icons, info icon, to view the plots.
    • 1300 nm Center Wavelength
    • Large Entrance Pupil: 6 mm
    • Wide Scan Angle Range: ±14.0° (Maximum, Single Axis)
    • Large Maximum Field of View: 18.8 x 18.8 mm2
    • Minimum Spot Size: 22 µm at 1300 nm (See Table at Right)

    Compared with many of our other LSM scan lenses, the LSM54 lenses, with their larger entrance pupils and range of scan angles, offer better compatibility with galvo mirrors that are larger and produce more highly deflected beams. Other features made possible through optimized optical design and an increased number of refractive elements include improved chromatic correction and the ability to operate over a wide spectral range. For systems operating in the 750 to 950 nm or 950 to 1150 nm wavelength ranges, the LSM54-850 or LSM54-1050 lenses, respectively, provide similar performance.

    The table at right includes key specifications for the LSM54-1310 lens, including a representative plot showing the small spot size and the spot position in the image plane as a function of all scanned angles at a wavelength of 1300 nm. Click on the blue icons, info icon, to view the spot size and transmittance plots. For additional specifications, please see the Specs tab.

    The external M25 × 0.75 threading can be adapted to Thorlabs' standard SM1 (1.035"-40) threading by using an SM1A12 adapter. An RMSA2 adapter allows the scan lens to be used with RMS-threaded (0.800"-36) components.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    LSM54-1310 Support Documentation
    LSM54-1310Scan Lens, 1200 to 1400 nm, EFL=54 mm
    $1,659.97
    Today

    1250 to 1380 nm Wavelength Range

    Key Specificationsa,b
    Item # LSM02 LSM03 LSM04 LSM05
    Wavelength Range 1250 to 1380 nm
    Effective Focal Length 18 mm 36 mm 54 mm 110 mm
    Lens Working Distance 7.5 mm 25.1 mm 42.3 mm 93.8 mm
    Field of View, Maximum 4.7 x 4.7 mm2 9.4 x 9.4 mm2 14.1 x 14.1 mm2 28.9 x 28.9 mm2
    Field of View,
    Diffraction Limited
    4.2 x 4.2 mm2 9.3 x 9.3 mm2 14.1 x 14.1 mm2 23.8 x 23.8 mm2
    Spot Size plot, 1315 nm
    (Two-Axis Scan)
    Mounting Threads (External) M25 x 0.75 SM2 (2.035"-40)
    • For detailed specs, please refer to the Specs tab.
    • Click the blue icons, info icon, to view the plots.
    • 1315 nm Center Wavelength
    • Entrance Pupil: 4 mm
    • Scan Angle Range: ±10.6° (Maximum, Single Axis)
    • Range of Effective Focal Length Options
    • External M25 x 0.75 Mounting Threads

    The LSM02, LSM03, LSM04, and LSM05 scan lenses are designed and have AR coatings for imaging centered around 1315 nm in the near-infrared.  

    Representative plots of the spot size along the sagittal and tangential scan directions can be seen by clicking on the blue icons, info icon, in the table to the right. For a detailed list of specifications, please see the Specs tab.

    The external M25 × 0.75 threading can be adapted to Thorlabs' standard SM1 (1.035"-40) threading by using an SM1A12 adapter. An RMSA2 adapter allows the scan lens to be used with RMS-threaded (0.800"-36) components.

    Based on your currency / country selection, your order will ship from Newton, New Jersey  
    +1 Qty Docs Part Number - Universal Price Available
    LSM02 Support Documentation
    LSM02Scan Lens, 1250 to 1380 nm, EFL=18 mm
    $1,670.79
    Today
    LSM03 Support Documentation
    LSM03Scan Lens, 1250 to 1380 nm, EFL=36 mm
    $1,036.66
    Today
    LSM04 Support Documentation
    LSM04Scan Lens, 1250 to 1380 nm, EFL=54 mm
    $1,025.85
    Today
    LSM05 Support Documentation
    LSM05Customer Inspired! Scan Lens, 1250 to 1380 nm, EFL=110 mm
    $1,025.85
    Today
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