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Handheld Laser Source


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Features

  • Output Wavelength: 635 nm
  • FC/PC Fiber Connector
  • Selectable Low (~1 mW), High (≥2.5 mW), and Pulse (≥2.5 mW at 2 Hz, 50% Duty Cycle) Output Power Levels
  • Automatic Power Control
  • Universal Power Supply Included
  • Red Rubber Cover Boot with Kickstand
  • Compact Design for Easy Handling: 5.8" x 3.1" x 1.36" With Boot

This compact, handheld fiber-coupled laser source (measuring only 5.8" x 3.1" x 1.36") is intended to be used as a portable alignment laser. The laser output of the HLS635 may be set in 3 modes: low power (~1 mW), high power (≥2.5 mW), and a pulse mode that switches the laser from high power to off at 2 Hz. The selected mode is indicated by indicator lights on the front panel of the HLS635. The output is FC/PC coupled using the standard SM600 single mode fiber pigtail, which provides true single mode output at 635 nm. The unit includes an internal 3.6 V NiMH rechargeable battery and charger. A removable red rubber cover boot with a kickstand is also included.

The universal DC power supply will work with line voltages between 90 and 264 VAC from 47 to 63 Hz. To charge this device, the HLS635 must not be lasing and be within the battery charge temperature range (see the Specs tab). Additionally, Thorlabs also offers other Fiber-Coupled Laser Sources.

Note: The laser must be off when connecting or disconnecting fibers from the device.

HLS635 Sample Output
Click to Enlarge

Specifications
HLS635
Center Wavelength635 nm
Operating ModeLow, High, Pulse
CW Output Power (High/Low)>2.5 mW/1 mW
Pulsed Output Power (High/Low)>2.5 mW/~0 mW
Power Stability≤1%
Pulse Frequency2 Hz, 50% Duty Cycle
Laser Class3R
Fiber ConnectorFC/PC
DC Input Voltage9 VDC, 2A (9.2 VDC Max)
Operating Temperature Range4 - 45 °C
Battery TypeNiMH, 3.6 V
Battery Life>8 Hours (on Full Charge), ~60 Days (on Standby)
Battery Temperature Limits-20 - 60 °C
Maximum Charge Time~135 Minutes
Battery Charge Temperature Range10 - 38 °C
Dimensions5.8" x 3.1" x 1.36" (147.2 x 78.7 x 34.5 mm)
HLS635 Power Supply
AC Adapter Input90 - 264 VAC, 0.6 A, 47 - 63 Hz
Max Power18 W
Output Voltage9 VDC, 2 A

Laser Safety and Classification

Safe practices and proper usage of safety equipment should be taken into consideration when operating lasers. The eye is susceptible to injury, even from very low levels of laser light. Thorlabs offers a range of laser safety accessories that can be used to reduce the risk of accidents or injuries. Laser emission in the visible and near infrared spectral ranges has the greatest potential for retinal injury, as the cornea and lens are transparent to those wavelengths, and the lens can focus the laser energy onto the retina. 

Alignment Tools
Laser Barriers
Enclosure Systems
Blackout Materials
Laser Glasses
Laser Viewing Cards
Laser Safety Signs
Shutter and Controllers

Safe Practices and Light Safety Accessories

  • Thorlabs recommends the use of safety eyewear whenever working with laser beams with non-negligible powers (i.e., > Class 1) since metallic tools such as screwdrivers can accidentally redirect a beam.
  • Laser goggles designed for specific wavelengths should be clearly available near laser setups to protect the wearer from unintentional laser reflections.
  • Goggles are marked with the wavelength range over which protection is afforded and the minimum optical density within that range.
  • Laser Barriers and Blackout Materials can prevent direct or reflected light from leaving the experimental setup area.
  • Thorlabs' Enclosure Systems can be used to contain optical setups to isolate or minimize laser hazards.
  • A fiber-pigtailed laser should always be turned off before connecting it to or disconnecting it from another fiber, especially when the laser is at power levels above 10 mW.
  • All beams should be terminated at the edge of the table, and laboratory doors should be closed whenever a laser is in use.
  • Do not place laser beams at eye level.
  • Carry out experiments on an optical table such that all laser beams travel horizontally.
  • Remove unnecessary reflective items such as reflective jewelry (e.g., rings, watches, etc.) while working near the beam path.
  • Be aware that lenses and other optical devices may reflect a portion of the incident beam from the front or rear surface.
  • Operate a laser at the minimum power necessary for any operation.
  • If possible, reduce the output power of a laser during alignment procedures.
  • Use beam shutters and filters to reduce the beam power.
  • Post appropriate warning signs or labels near laser setups or rooms.
  • Use laser sign lightboxes if operating Class 3R or 4 lasers (i.e., lasers requiring the use of a safety interlock).
  • Do not use Laser Viewing Cards in place of a proper Laser Barrier or Beam Trap.

 

Laser Classification

Lasers are categorized into different classes according to their ability to cause eye and other damage. The International Electrotechnical Commission (IEC) is a global organization that prepares and publishes international standards for all electrical, electronic, and related technologies. The IEC document 60825-1 outlines the safety of laser products. A description of each class of laser is given below:

ClassDescriptionWarning Label
1This class of laser is safe under all conditions of normal use, including use with optical instruments for intrabeam viewing. Lasers in this class do not emit radiation at levels that may cause injury during normal operation, and therefore the maximum permissible exposure (MPE) cannot be exceeded. Class 1 lasers can also include enclosed, high-power lasers where exposure to the radiation is not possible without opening or shutting down the laser. Class 1
1MClass 1M lasers are safe except when used in conjunction with optical components such as telescopes and microscopes. Lasers belonging to this class emit large-diameter or divergent beams, and the MPE cannot normally be exceeded unless focusing or imaging optics are used to narrow the beam. However, if the beam is refocused, the hazard may be increased and the class may be changed accordingly. Class 1M
2Class 2 lasers, which are limited to 1 mW of visible continuous-wave radiation, are safe because the blink reflex will limit the exposure in the eye to 0.25 seconds. This category only applies to visible radiation (400 - 700 nm). Class 2
2MBecause of the blink reflex, this class of laser is classified as safe as long as the beam is not viewed through optical instruments. This laser class also applies to larger-diameter or diverging laser beams. Class 2M
3RLasers in this class are considered safe as long as they are handled with restricted beam viewing. The MPE can be exceeded with this class of laser, however, this presents a low risk level to injury. Visible, continuous-wave lasers are limited to 5 mW of output power in this class. Class 3R
3BClass 3B lasers are hazardous to the eye if exposed directly. However, diffuse reflections are not harmful. Safe handling of devices in this class includes wearing protective eyewear where direct viewing of the laser beam may occur. In addition, laser safety signs lightboxes should be used with lasers that require a safety interlock so that the laser cannot be used without the safety light turning on. Class-3B lasers must be equipped with a key switch and a safety interlock. Class 3B
4This class of laser may cause damage to the skin, and also to the eye, even from the viewing of diffuse reflections. These hazards may also apply to indirect or non-specular reflections of the beam, even from apparently matte surfaces. Great care must be taken when handling these lasers. They also represent a fire risk, because they may ignite combustible material. Class 4 lasers must be equipped with a key switch and a safety interlock. Class 4
All class 2 lasers (and higher) must display, in addition to the corresponding sign above, this triangular warning sign Warning Symbol
Click the Support Documentation icon document icon or Part Number below to view the available support documentation
Part Number Product Description
HLS635 Support Documentation HLS635 : Handheld Laser Source, 635 nm, FC/PC

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Posted Comments:
Poster: tcohen
Posted Date: 2013-11-14 04:09:08.0
Response from Tim at Thorlabs: It would not be easy for the end user to make this modification but we may be able to quote this as a special. I'll contact you to keep you updated.
Poster: thiel
Posted Date: 2013-11-05 17:02:51.837
Is it possible to switch the laser on and of with a power supply insted of the battery? We like to change it.
Poster: bdada
Posted Date: 2012-06-08 12:55:00.0
Response from Buki at Thorlabs to edouard.schmidtlin: Thank you for participating in our feedback forum. The HLS635 laser source was recently released and we really appreciate your interest. I have shared your feedback with our production team for consideration as we continue to expand this product line.
Poster: edouard.schmidtlin
Posted Date: 2012-06-07 12:05:47.0
Could you propose such pigtailed laser source for major wavelenghts (850, 1310, 633, 532 etc)?
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HLS635 Support Documentation
HLS635 Customer Inspired! Handheld Laser Source, 635 nm, FC/PC
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