Infrasil® (Optical Quartz) Windows

Uncoated Windows for 300 nm - 3 µm
1.0, 3.0, or 5.0 mm Thick Windows
Ø1/2" and Ø1" Versions Available
Offer Enhanced Transmission Above 1 µm

UDP10

(Ø1", 1.0 mm Thick)

UDP053

(Ø1/2", 3.0 mm Thick)

UDP05

(Ø1/2", 1.0 mm Thick)

UDP105

(Ø1", 5.0 mm Thick)

Related Items

Precision Windows

Fixed Optic Mounts

Ultrafast Beamsplitters

Alignment Tools

Optics Handling

Lab Supplies

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Overview
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Window Guide

Flat Window Selection Guide
Wavelength Range	Substrate Material
180 nm - 8.0 μm	Calcium Fluoride (CaF₂)
185 nm - 2.1 μm	UV Fused Silica
200 nm - 5.0 μm	Sapphire
200 nm - 6.0 μm	Magnesium Fluoride (MgF₂)
220 nm to >50 µm	CVD Diamond Windows
230 nm - 1.1 µm	UV Fused Silica, Textured Antireflective Surface
250 nm - 1.6 µm	UV Fused Silica, for 45° AOI
250 nm - 26 µm	Potassium Bromide (KBr)
300 nm - 3 µm	Infrasil^®
350 nm - 2.0 μm	N-BK7
600 nm - 16 µm	Zinc Selenide (ZnSe)
1 - 1.7 µm	Infrasil^®, Textured Antireflective Surface
1.2 - 8.0 μm	Silicon (Si)
1.9 - 16 μm	Germanium (Ge)
2 - 5 μm	Barium Fluoride (BaF₂)
V-Coated Laser Windows

Recommended Configuration with a 1.0 mm Window
for Balanced Dispersion in Transmitted and Reflected
Beam of 50:50 Ultrafast Beamsplitter (Only Necessary
for Sub-50 fs Pulses)

Features

Ø1/2" and Ø1" Windows
1.0, 3.0, or 5.0 mm Thickness
Flat Transmission from 300 nm to 3 µm
Nearly Identical Material Properties to UV Fused Silica
Ideal for Dispersion Management in Ultrafast Applications

These uncoated windows are fabricated from Infrasil^®†, a type of optical quartz. Infrasil is a popular alternative to UV fused silica since the two materials have nearly identical mechanical and optical properties. Relative to UV fused silica, Infrasil offers increased internal transmission around 1380 nm, flat transmission from the UV to the mid-IR, and nearly identical dispersion. The plot above shows the total transmission of a sample window from 200 nm to 3.2 µm.

Please note that these optics are significantly thinner than most windows, making them more delicate than their thicker counterparts. They are also too thin for standard setscrew-based optic mounts. In applications where one of these windows is being placed in an optic mount, it should be secured using a retaining ring, as is done in Fixed Optic Mounts.

Usage in Ultrafast Applications
When one of the 1.0 mm thick windows is combined with our UFBS5050 Ultrafast Beamsplitter, the transmitted and reflected arms of the beamsplitter will have nearly equal group delay dispersion (GDD). For our other Ultrafast Beamsplitters, our 1.0 mm thick Infrasil windows are not thick enough to balance the dispersion exactly, but they will still improve dispersion matching between the beams. When using our 4.0 mm thick beamsplitters, the 3.0 mm or 5.0 mm thick Infrasil windows (Item #s UDP053 and UDP105) may be used to provide some dispersion compensation, although it was not specifically designed to match those items.

†Infrasil is a registered trademark of Heraeus Quarzglas.

Posted Comments:

Carolina Barrientos (posted 2021-02-03 21:50:38.763)

Dear All, I write from Aerial Photogrammetric Service of Chilean Air Force since we need to modify 2 G-IV for photogrammetry and remote sensing soon (this and next year). We have some doubts regarding the optical window and we are visualizing Infrasil as possible material. For our digital camera we have a sort of requirements, The window should be around 60x 60 cm, fullfil M, Mil Specs MIL-W-1366F (ASG) Oct. 1975, S/D 80/50 and antireflective coating (e.g. RYN-1, RYN-B, AR106). However we are considering a hyperspectral VNIR-SWIR for the near future. Some providers have suggested S/D 60/40 and the requirements of transmittance along the spectral range, however we have a doubt regarding the coatings. The above mentioned work up to ~1000nm and we would need to know if you provide another option suitable for the sensor we have and if having a coating or not would interfere with a hyperspectral sensor. I would be very gratefull for any feedback Carolina Barrientos Gajardo Aerial Photogrammetric Service Chilean Air Force E-mail: carolina.barrientos@saf.cl Web: www.saf.cl 56- 02-29769360 Av. Diego Barros Ortiz Nº 2300 – Aeropuerto Arturo Merino Benítez - Pudahuel Skype: carolina.barrientos.saf

YLohia (posted 2021-02-03 11:22:35.0)

Thank you for contacting Thorlabs. Custom optics can be requested by clicking the "Request Quote" button above or by emailing your local Thorlabs Team (in your case techsupport.br@thorlabs.com). We will contact you directly to discuss this further.

Abani Nayak (posted 2019-05-23 10:12:14.667)

I would like to have Rectangular shape of Infrasil instead of Circular. Can I get rectangular window of Infrasil with customized length, width or height?

YLohia (posted 2019-05-23 10:06:30.0)

Hello, thank you for contacting Thorlabs. We are reaching out to you directly to discuss the possibility of offering a custom option.

jarias (posted 2017-04-03 06:59:16.557)

Is it possible to get this window in 2 inches diameter and with AR coating for 1070 nm?

tfrisch (posted 2017-04-19 02:44:03.0)

Hello, thank you for contacting Thorlabs. I have contacted you directly concerning more details for a quote.

Window Selection Guide (Table Sorted by Wavelength)
Substrate and Window Type	Wavelength Range	Available AR Coatings	Reflectance over AR Coating Range^a	Transmission Data	Reflectance Data
Calcium Fluoride (CaF₂): Flat or Wedged	180 nm - 8.0 μm	Uncoated	-	Raw Data	-
Calcium Fluoride (CaF₂): Flat or Wedged	180 nm - 8.0 μm	-D Coating, 1.65 - 3.0 µm	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
UV Fused Silica: Flat, Wedged, V-Coated Flat, or V-Coated Wedged	185 nm - 2.1 μm	Uncoated (Flat or Wedged)	-	Raw Data	-
		-UV Coating, 245 - 400 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C3 Coating, 261 - 266 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C6 Coating, 350 - 450 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-A Coating, 350 - 700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-B Coating, 650 - 1050 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C Coating, 1050 - 1700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
Sapphire: Flat or Wedged	200 nm - 5.0 μm	Uncoated	-	Raw Data	-
		-D Coating, 1.65 - 3.0 µm	R_avg < 1.0% at 0° AOI	Raw Data	Raw Data
		-E1 Coating, 2.0 - 5.0 µm	R_avg< 1.50%, R_abs< 3.0% (per Surface, 2.0 - 5.0 µm); R_avg < 1.75% (per Surface, 2.0 - 4.0 µm) at 0° AOI	Raw Data	Raw Data
Magnesium Fluoride (MgF₂): Flat or Wedged	200 nm - 6.0 μm	Uncoated	-	Raw Data	-
Barium Fluoride (BaF₂): Flat or Wedged	200 nm - 11 µm	Uncoated (Wedged Only)	-	Raw Data	-
Barium Fluoride (BaF₂): Flat or Wedged	200 nm - 11 µm	-E1 Coating, 2 - 5 µm	R_avg < 1.25%; R_abs < 2.5% at 0° AOI	Raw Data	Raw Data
UV Fused Silica, for 45° AOI: Flat or Wedged	250 nm - 1.6 µm	Coating for 250 nm - 450 nm	R_avg < 1.0% at 45° AOI	Raw Data
		Coating for 350 nm - 1100 nm	R_avg < 2.0% at 45° AOI	Raw Data
		Coating for 400 nm - 700 nm	R_avg < 1.0% at 45° AOI	Raw Data
		Coating for 600 nm - 1700 nm	R_avg < 1.5% at 45° AOI	Raw Data
		Coating for 700 nm - 1100 nm	R_avg < 1.0% at 45° AOI	Raw Data
		Coating for 1200 nm - 1600 nm	R_avg < 1.0% at 45° AOI	Raw Data
Potassium Bromide (KBr): Flat	250 nm - 26 µm	Uncoated	-		-
Infrasil^®: Flat	300 nm - 3 µm	Uncoated	-	Raw Data	-
N-BK7: Flat, Wedged, V-Coated Flat, or V-Coated Wedged	350 nm - 2.0 μm	Uncoated (Flat or Wedged)	-	Raw Data	-
		-A Coating, 350 - 700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C7 Coating, 400 - 700 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C10 Coating, 523 - 532 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C11 Coating, 610 - 860 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-B Coating, 650 - 1050 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C13 Coating, 700 - 1100 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		C14 Coating, 1047 - 1064 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C15 Coating, 523 - 532 nm & 1047 - 1064 nm (V-Coated)	R_avg < 0.5% at 0° AOI	-	Raw Data
		-C Coating, 1050 - 1700 nm (Flat or Wedged)	R_avg < 0.5% at 0° AOI	-	Raw Data
Zinc Selenide (ZnSe): Flat or Wedged	600 nm - 16 µm	Uncoated	-	Raw Data	-
		-D Coating, 1.65 - 3.0 µm	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
		-E4 Coating, 2 - 13 µm (Only Flat)	R_avg < 3.5%; R_abs < 6% at 0° AOI	Raw Data	Raw Data
		-E2 Coating, 4.5 - 7.5 µm (Only Flat)	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
		-E3 Coating, 7 - 12 µm (Only Wedged)	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data
		-G Coating, 7 - 12 µm (Only Flat)	R_avg < 1% at 0° AOI	Raw Data	Raw Data
Silicon (Si): Flat or Wedged	1.2 - 8.0 μm	Uncoated	-	Raw Data	-
		-E1 Coating, 2 - 5 µm (Only Wedged)	R_avg < 1.25%; R_abs < 2.5% at 0° AOI	Raw Data	Raw Data
		-E Coating, 3 - 5 µm (Only Flat)	R_avg < 2% at 0° AOI	Raw Data	Raw Data
Germanium (Ge): Flat or Wedged	1.9 - 16 μm	Uncoated, 2.0 - 16 μm	-	Raw Data	-
		-C9 Coating, 1.9 - 6 µm (Only Flat)	R_avg < 2% at 0° AOI	Raw Data	Raw Data
		-E3 Coating, 7 - 12 µm	R_avg < 1.0%; R_abs < 2.0% at 0° AOI	Raw Data	Raw Data

Reflectance is given per surface and each window is coated on both sides.

Ø1/2" Infrasil® Windows, Uncoated

Zoom

Item #	UDP05	UPD053
Diameter	1/2" (12.7 mm)
Diameter Tolerance	+0.0 / -0.1 mm	+0.0 / -0.2 mm
Thickness	1.0 mm	3.0 mm
Thickness Tolerance	±0.1 mm	±0.3 mm
Clear Aperture	>90% of Diameter	≥80% of Diameter
Parallelism	<5 arcmin	<3 arcmin
Transmitted Wavefront Error^a	<λ/10 Over Clear Aperture
Surface Quality	10-5 Scratch-Dig
Wavelength Range	300 nm - 3 µm (Uncoated)
Substrate	Infrasil^®
Transmission Data	Raw Data	Raw Data

Measured at 633 nm

Ø1" Infrasil® Window, Uncoated

Zoom

Item #	UDP10	UDP105
Diameter	1" (25.4 mm)
Diameter Tolerance	+0.0 / -0.1 mm	+0.0 / -0.2 mm
Thickness	1.0 mm	5.0 mm
Thickness Tolerance	±0.1 mm	±0.3 mm
Clear Aperture	>80% of Diameter	≥85% of Diameter
Parallelism	<5 arcmin	<3 arcmin
Transmitted Wavefront Error^a	<λ/10 Over Clear Aperture
Surface Quality	10-5 Scratch-Dig
Wavelength Range	300 nm - 3 µm (Uncoated)
Substrate	Infrasil^®
Transmission Data	Raw Data	Raw Data

Measured at 633 nm