Rutile TiO₂ Polarizers

Extinction Ratio: 100 000:1
2.2 - 4 µm Wavelength Range
Transmits Linearly Polarized Light

GTR8-MIR

GTR5-MIR

GTR5-MIR Mounted in a
PRM1GL10 Rotation Mount

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Overview
Specs
Feedback
Polarizer Guide

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Figure 1.1 Side View of a Rutile Polarizer
Unpolarized Light Enters, S-Polarized Light is Reflected
and Absorbed, P-Polarized Light is Transmitted

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Features

100 000:1 Extinction Ratio
2.2 - 4 µm Wavelength Range
AR-Coated Entrance and Exit Faces for the Entire Wavelength Range

Our Rutile (TiO₂) Polarizers offer extremely pure polarization of light with a 100 000:1 extinction ratio. They are meant for use with lasers in the 2.2 - 4 µm wavelength range and have an air-spaced design. Please note that Rutile Polarizing Prisms are designed to work with well collimated light beams. Divergent beams will produce multiple output beams.

Our Rutile Polarizing Prisms utilize a Glan-Foucault design, with two right-angle rutile prisms spaced slightly apart to create a gap. As rutile is a positively birefringent crystal, as opposed to a negatively birefringent material like calcite, the ordinary, rather than the extraordinary ray, is transmitted. When unpolarized light enters the polarizer, the beam is split into two polarized rays at the internal interface. Due to the difference in refractive indices, n_o and n_e, the ordinary polarization component (p-polarized light) passes straight through the polarizer without deviation, while the extraordinary polarization component (s-polarized light) is deflected by total internal reflection and absorbed by the polarizer housing. The output polarization is parallel with the Polarization Axis line on the polarizer housing.

Our rutile polarizers have λ/4 polished optical faces with a Ø5 mm or Ø8 mm clear aperture. Additionally, the entrance and exit faces are AR-Coated over the entire wavelength range. They include a square aluminum housing with the polarization axis clearly marked. The GTR5 has a 9.6 mm square housing, while the GTR8 has a 15.9 mm square housing.

The GTM5 is compatible with the SM05PM5 and PRM05GL5 mounts, while GTM8 is compatible with the SM1PM10 and PRM1GL10 mounts.

Item #	GTR5-MIR	GRT8-MIR
Material	TiO₂ (Rutile)^a
Extinction Ratio^b	100 000:1
Wavelength Range	2.2 - 4 µm
Transmission	93% Average within Specified Wavelength Range
Acceptance Angle (Typical)	±2.0°
Beam Deviation	<3 arcmin
Surface Quality	20-10 Scratch-Dig
Surface Flatness (@633 nm)	λ/4
AR Coating (Entrance and Exit Windows)	R_avg < 1% from 2.2 - 4 µm
Clear Aperture	Ø5 mm	Ø8 mm
Housing	Anodized Aluminum
Housing Dimensions (l x w x h)	9.1 mm x 9.5 mm x 9.5 mm	10.7 mm x 15.9 mm x 15.9 mm
Recommended Mounts	SM05PM5 PRM05GL5	SM1PM10 PRM1GL10

Click Link for Detailed Specifications on the Substrate
The extinction ratio (ER) is the ratio of maximum to minimum transmission of a sufficiently linearly polarized input. When the transmission axis and input polarization are parallel, the transmission is at its maximum; rotate the polarizer by 90° for minimum transmission.

Posted Comments:

Giorgio Guercio (posted 2023-06-26 09:16:30.83)

Hello, Is it possible to obtain a transmittance spectrum that cover the wavelength range between 1000-2000 nm for the GTR5-MIR device? Best regards

jpolaris (posted 2023-06-26 02:25:43.0)

Thank you for contacting Thorlabs. GTR5-MIR uses a Rutile (TiO2) substrate, which has a typical transmission of ~70% - 73% within the 1000 nm - 2000 nm range. I have reached out to you directly with extended transmission data for this substrate. More information about Rutile can be found at the following page. https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=6973&tabname=Rutile.

jean-christophe.delagnes (posted 2016-03-22 21:48:46.147)

Rutile Sellmeier equation for both (o) and (e) wave is the one established by Devore in 1951. This formula is only specified for wavelength in the 0.43 - 1.53 um range while GTR8-MIR is specified for 2.2 - 4 um? How can I estimate the GVD of this polarizer at 3 um (ultrafast application)? Can you update the product page with GVD in the ragne of interest?

besembeson (posted 2016-03-24 04:35:47.0)

Response from Bweh at Thorlabs USA: That is correct. We will review the plot we have that extends to 5um. I will contact you regarding the GVD around 3um.

Polarizer Selection Guide

Thorlabs offers a diverse range of polarizers, including wire grid, film, calcite, alpha-BBO, rutile, and beamsplitting polarizers. Collectively, our line of wire grid polarizers offers coverage from the visible range to the beginning of the Far-IR range. Our nanoparticle linear film polarizers provide extinction ratios as high as 100 000:1. Alternatively, our other film polarizers offer an affordable solution for polarizing light from the visible to the Near-IR. Next, our beamsplitting polarizers allow for use of the reflected beam, as well as the more completely polarized transmitted beam. Finally, our alpha-BBO (UV), calcite (visible to Near-IR), rutile (Near-IR to Mid-IR), and yttrium orthovanadate (YVO₄) (Near-IR to Mid-IR) polarizers each offer an exceptional extinction ratio of 100 000:1 within their respective wavelength ranges.

To explore the available types, wavelength ranges, extinction ratios, transmission, and available sizes for each polarizer category, click More [+] in the appropriate row below.

Wire Grid Polarizers

Film Polarizers

Beamsplitting Polarizers

alpha-BBO Polarizers

Calcite Polarizers

Quartz Polarizers

Magnesium Fluoride Polarizers

Yttrium Orthovanadate (YVO₄) Polarizers

Rutile Polarizers

Click on the graph icons in this column to view a transmission curve for the corresponding polarizer. Each curve represents one substrate sample or coating run and is not guaranteed.
Mounted in a protective box, unthreaded ring, or cylinder.
Available unmounted or mounted in cubes for cage system compatibility.
Available unmounted or in an SM05-threaded (0.535"-40) mount that indicates the polarization axis.
Available unmounted or in an SM1-threaded (1.035"-40) mount that indicates the polarization axis.
PBS519: Average T_P:T_S > 1000:1
Calcite's transmittance of light near 350 nm is typically around 75% (see Transmission column).
Available unmounted or in an unthreaded Ø1/2" housing.
The transmission curves for calcite are valid for linearly polarized light with a polarization axis aligned with the mark on the polarizer's housing.
The 1064 nm V coating corresponds to a -C26 suffix in the item number.
Available unmounted or mounted in a protective box or unthreaded cylinder that indicates the polarization axis.

Polarizer Type	Wavelength Range	Extinction Ratio	Transmission^a	Available Sizes
Wire Grid Polarizers on Glass Substrates	300 nm - 3.2 µm	≥30:1 at 300 nm ≥600:1 at 450 nm ≥650:1 at 550 nm ≥650:1 at 650 nm ≥700:1 at 800 nm ≥800:1 at 1100 nm ≥800:1 at 2500 nm ≥5000:1 at 3200 nm		12.5 mm x 12.5 mm, Ø25.0 mm^b, 25.0 mm x 25.0 mm, and 50.0 mm x 50.0 mm
Wire Grid Polarizers on Glass Substrates	420 nm - 700 nm	>683:1 (Unmounted) >800:1 (Mounted)	-
Wire Grid Polarizing Beamsplitter Cubes (Unmounted or 30 mm Cage Cube)	400 nm - 700 nm	>1000:1 (AOI: 0° - 5°) >100:1 (AOI: 0° - 25°)	P-Pol. S-Pol.	1"^c
Holographic Wire Grid Polarizers	2.5 µm - 12 µm	>150:1 at 3 µm 300:1 at 10 µm		Ø25.0 mm^b and Ø50.0 mm^b
	2.5 µm - 9 µm	>150:1 at 3 µm 300:1 at 8 µm
	2.5 µm - 30 µm	>150:1 at 3 µm 300:1 at 15 µm
	2.5 µm - 18 µm	>150:1 at 3 µm 300:1 at 10 µm
MIR Wire Grid Polarizers on Silicon Substrates	3 µm - 5 µm	>1000:1		12.5 mm x 12.5 mm^b, Ø25.0 mm^b, 25.0 mm x 25.0 mm^b, and 50.0 mm x 50.0 mm^b
MIR Wire Grid Polarizers on Silicon Substrates	7 µm - 15 µm	>10 000:1		12.5 mm x 12.5 mm^b, Ø25.0 mm^b, 25.0 mm x 25.0 mm^b, and 50.0 mm x 50.0 mm^b

Polarizer Type	Wavelength Range	Extinction Ratio	Transmission^a	Available Sizes
Nanoparticle Linear Film Polarizers	365 nm - 395 nm	>1000:1 from 365 nm - 395 nm >10 000:1 from 369 nm - 390 nm >100 000:1 from 372 nm - 388 nm		Ø12.5 mm^d and Ø25.0 mm^e
	480 nm - 550 nm	>10 000:1 from 480 nm - 550 nm		Ø12.5 mm^d and Ø25.0 mm^e
	510 nm - 800 nm	>1000:1 from 510 nm - 800 nm >10 000:1 from 520 - 740 nm >100 000:1 from 530 - 640 nm		Ø12.5 mm^d and Ø25.0 mm^e
	550 nm - 1500 nm	>10 000:1 from 550 nm - 1500 nm >100 000:1 from 600 nm - 1200 nm		Ø12.5 mm^d and Ø25.0 mm^e
	650 nm - 1100 nm	>200:1 from 650 nm - 695 nm >1000:1 from 695 nm - 1100 nm		Ø1/2"^d and Ø1"^e
	650 nm - 2000 nm	>1000:1 from 650 nm - 2000 nm >10 000:1 from 750 nm - 1800 nm >100 000:1 from 850 nm - 1600 nm		Ø12.5 mm^d and Ø25.0 mm^e
	1 µm - 3 µm	>1000:1 from 1 µm - 3 µm >10 000:1 from 1.2 µm - 3 µm		Ø12.5 mm^d and Ø25.0 mm^e
	1.1 µm - 1.8 µm	>1000:1 from 1.1 µm - 1.8 µm		Ø1/2"^d and Ø1"^e
	1.26 µm - 1.36 µm	>10 000:1 from 1.26 µm - 1.36 µm		Ø12.5 mm^d and Ø25.0 mm^e
	1.50 µm - 1.60 µm	>10 000:1 from 1.50 µm - 1.60 µm		Ø12.5 mm^d and Ø25.0 mm^e
	1.5 µm - 5 µm	>1000:1 from 1.5 µm - 5 µm >10 000:1 from 2 µm - 4.5 µm		Ø12.5 mm^d and Ø25.0 mm^e
Economy Film Polarizers	400 nm - 700 nm	>100:1 from 400 nm - 500 nm >1000:1 from 500 nm - 700 nm >5000:1 from 530 nm - 690 nm		2" x 2"
Economy Film Polarizers	600 nm - 1100 nm	>400:1 from 600 nm - 1100 nm >1000:1 from 600 nm - 940 nm		2" x 2"
Economy Laminated Film Polarizers	400 nm - 700 nm	>100:1 from 400 nm - 500 nm >1000:1 from 500 nm - 700 nm >5000:1 from 530 nm - 690 nm		Ø1/2", Ø1", and Ø2"
	600 nm - 1100 nm	>1000:1 from 600 nm - 950 nm >400:1 from 600 nm - 1100 nm		Ø1/2", Ø1", and Ø2"
	1050 nm - 1700 nm	>1000:1 from 1050 - 1400 nm >2000:1 from 1400 - 1700 nm		Ø1/2", Ø1", and Ø2"

Polarizer Type	Wavelength Range	Extinction Ratio	Transmission^a	Available Sizes
Polarizing Plate Beamsplitters	405 nm	>10 000:1		Ø1" and 25 mm x 36 mm
	532 nm
	633 nm
	780 nm
	808 nm
	1030 nm
	1064 nm
	1310 nm
	1550 nm
Broadband Polarizing Beamsplitter Cubes (Unmounted, 16 mm Cage Cube, or 30 mm Cage Cube)	420 nm - 680 nm	>1000:1^f		5 mm, 10 mm, 1/2", 20 mm^c, 1"^c, and 2"
	620 nm - 1000 nm
	700 nm - 1300 nm
	900 nm - 1300 nm
	1200 nm - 1600 nm
Wire Grid Polarizing Beamsplitter Cubes (Unmounted or 30 mm Cage Cube)	400 nm - 700 nm	>1000:1 (AOI: 0° - 5°) >100:1 (AOI: 0° - 25°)	P-Pol. S-Pol.	1"^c
Laser-Line Polarizing Beamsplitter Cubes (Unmounted or 30 mm Cage Cube)	532 nm	>3000:1		10 mm, 1/2", 1"^c
	633 nm
	780 nm
	980 nm			1"^c
	1064 nm			10 mm, 1/2", 1"^c
	1550 nm			10 mm, 1/2", 1"^c
High-Power Laser-Line Polarizing Beamsplitter Cubes (Unmounted or 30 mm Cage Cube)	355 nm	>2000:1		1/2" and 1"^c
	405 nm
	532 nm
	633 nm
	780 - 808 nm
	1064 nm
High-Power, Broadband, High Extinction Ratio Polarizers	700 nm - 1100 nm	>1000:1 (700 - 1100 nm) >5000:1 (750 - 1000 nm) >10 000:1 (800 - 900 nm)		12.7 mm (Input/Output Face, Square)
	720 nm - 1080 nm	>1000:1 (720 - 1080 nm) >10 000:1 (730 - 1060 nm) >100 000:1 (800 - 900 nm)		10 mm (Input/Output Face, Square)
	900 nm - 1300 nm	>1000:1 (900 - 1300 nm) >10 000:1 (900 - 1250 nm) >100 000:1 (980 - 1080 nm)		10 mm and 5 mm (Input/Output Face, Square)
Calcite Beam Displacers	350 nm^g - 2.3 µm (Uncoated)	-		10 mm^b (Clear Aperture, Square)
Yttrium Orthovanadate (YVO₄) Beam Displacers	488 nm - 3.4 µm (Uncoated)	-		>3 mm x 5 mm Ellipse^h (Clear Aperture)
Yttrium Orthovanadate (YVO₄) Beam Displacers	2000 nm (V Coated)	-		>3 mm x 5 mm Ellipse^h (Clear Aperture)

Polarizer Type	Wavelength Range	Extinction Ratio	Transmission^a	Available Sizes
alpha-BBO Glan-Laser Polarizers	210 nm - 450 nm	100 000:1		5 mm^b and 10 mm^b (Clear Aperture, Square)
	220 nm - 370 nm
	405 nm
Wollaston Prism Polarizers	190 nm - 3500 nm	>100 000:1		Ø10 mm^b (Clear Aperture)

Polarizer Type	Wavelength Range	Extinction Ratio	Transmission^a,i	Available Sizes
Glan-Laser Calcite Polarizers	350 nm^g - 2.3 µm (Uncoated)	100 000:1		5 mm^b, 10 mm^k, and 15 mm^b (Clear Aperture, Square)
	350 nm^g - 700 nm (A Coated)
	650 nm - 1050 nm (B Coated)
	1050 nm - 1700 nm (C Coated)
	1064 nm (V Coated)^j
Glan-Taylor Calcite Polarizers	350 nm^g - 2.3 µm (Uncoated)			5 mm^b, 10 mm^b, and 15 mm^b (Clear Aperture, Square)
	350 nm^g - 700 nm (A Coated)
	650 nm - 1050 nm (B Coated)
	1050 nm - 1700 nm (C Coated)
Glan-Thompson Calcite Polarizers (Unmounted or Mounted)	350 nm^g - 2.3 µm (Uncoated)			5 mm^k and 10 mm^k (Clear Aperture, Square)
	350 nm^g - 700 nm (A Coated)
	650 nm - 1050 nm (B Coated)
Double Glan-Taylor Calcite Polarizers	350 nm^g - 2.3 µm (Uncoated)			9 mm^b (Clear Aperture, Square)
Beam Displacers	350 nm^g - 2.3 µm (Uncoated)	-		10 mm^b (Clear Aperture, Square)
Wollaston Prism Polarizers	350 nm^g - 2.3 µm (Uncoated)	>100 000:1		Ø10 mm^k (Clear Aperture)
	350 nm^g - 700 nm (A Coated)
	650 nm - 1050 nm (B Coated)