Silicon Wedged Windows

30 arcminute Wedge
Eliminate Etalon Effects and Prevent Cavity Feedback
Uncoated and AR-Coated Silicon Substrates
Custom Options Available

WW81050

Ø1", Uncoated

Back Reflections from Wedges Are not Collinear with the Incident Beam
(Drawing not to Scale)

WW80530-E1

Ø1/2", AR Coated for 2 - 5 µm

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Overview
Feedback
Window Guide

Wedged 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)
200 nm - 11 µm	Barium Fluoride (BaF₂)
250 nm - 1.6 µm	UV Fused Silica for 45° AOI
350 nm - 2.0 μm	N-BK7
600 nm - 16 µm	Zinc Selenide (ZnSe)
1.2 - 8.0 µm	Silicon (Si)
2.0 - 16 µm	Germanium (Ge)
V-Coated Wedged Windows

Features

30 arcmin Wedged Windows
Ø1/2" or Ø1" Silicon Windows Available
Available Uncoated (1.20 - 8.0 µm) or with -E1 Broadband AR Coating (2 - 5 µm)
Custom Sizes Available by Contacting Tech Support

Thorlabs offers uncoated Ø1/2" and Ø1" wedged silicon (Si) windows. These wedged optics eliminate fringe patterns and can be used to help avoid cavity feedback. Windows are useful for protecting a laser output from environmental effects and for beam sampling applications. These windows are available uncoated or with an AR coating for 2 - 5 µm. We also supply planar windows with a variety of substrate materials and coating options.

Silicon is an ideal optical material for applications using wavelengths in the near-IR range and parts of the mid-IR range. Silicon offers high thermal conductivity and low density, making it suitable for laser windows. These windows are fabricated using optical Czochralski silicon (OCz-Si) and therefore exhibit a strong absorption band at 9 µm and low transmission at THz frequencies. As a result, they are not suitable for use in CO₂ laser transmission or terahertz applications.

In addition to the silicon wedged windows offered here, Thorlabs also offers wedged windows with other substrate materials (see the selection guide to the right). Wedged Laser Windows with AR coatings centered around common lasing wavelengths and wedged Beam Samplers with broadband AR coatings on only one face are also available. Additionally, wedged windows with custom sizes and thicknesses are available; please contact Tech Support for more information.

Posted Comments:

chen feifan (posted 2021-01-05 20:17:56.7)

which surface is the wedge surface?

YLohia (posted 2021-01-13 11:31:58.0)

Thank you for contacting Thorlabs. If the window is not engraved with an arrow on the edge pointing to the wedged side, you can rest the optic on a flat table on top of graph paper or lined paper. Then look for the reflection of the lines in the surface reflection. Tilt the window so that, on the flat side, the lines in the reflection are parallel to the lines on the paper. As the optic rolls, this will still be true on the flat side. On the angled side, the lines in the reflection will process around the lines on the paper when it rolls.

j.travers (posted 2017-08-04 16:42:16.427)

Can you provide 2" pieces, or at least 1.5"?

nbayconich (posted 2017-08-07 04:49:01.0)

Thank you for contacting Thorlabs. I will contact you directly about our custom capabilities.

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.

Silicon Wedged Windows, Uncoated

Zoom

Item #	WW80530	WW81050
Wedge Angle	30 ± 10 arcmin
Diameter	1/2" (12.7 mm)	1" (25.4 mm)
Diameter Tolerance	+0.0 / -0.2 mm
Thickness	3.0 mm	5.0 mm
Thickness Tolerance	±0.1 mm
Clear Aperture	≥Ø11.43 mm	≥Ø22.86 mm
Surface Flatness^a	≤λ/4 Over Central Ø5 mm ≤λ/2 Over Entire Clear Aperture	≤λ/4 Over Central Ø10 mm ≤λ/2 Over Entire Clear Aperture
Surface Quality	40-20 Scratch-Dig
Wavelength Range	1.2 - 8.0 µm (Uncoated)
Substrate	Silicon^b
Transmission Data (Click for Graph)	Raw Data

Measured at 633 nm
Click Link for Detailed Specifications on the Substrate

Silicon Wedged Windows, AR Coating: 2 - 5 µm

Zoom

Item #	WW80530-E3	WW81050-E3
Wedge Angle	30 ± 10 arcmin
Diameter	1/2" (12.7 mm)	1" (25.4 mm)
Diameter Tolerance	+0.0 / -0.2 mm
Thickness	3.0 mm	5.0 mm
Thickness Tolerance	±0.1 mm
Clear Aperture	>Ø11.4 mm	>Ø22.9 mm
Surface Flatness^a	≤λ/2 Over Central Ø5 mm ≤λ Over Entire Clear Aperture	≤λ/2 Over Central Ø10 mm ≤λ Over Entire Clear Aperture
Surface Quality	40-20 Scratch-Dig
AR Coating Range	2 µm - 5 µm (-E1 Coating)
Reflectance over AR Coating Range^b	R_avg < 1.25% (per Surface) R_abs < 2.5% (per Surface) Both Sides are Coated
Transmission over AR Coating Range^b	T_avg > 94% T_abs > 92%
Reflectance Data (Click for Graph)	Raw Data
Substrate	Silicon^c
Transmission Data (Click for Graph)	Raw Data

Measured at 633 nm
For Normal Incidence
Click Link for Detailed Specifications on the Substrate