Create an Account  |   Log In

View All »Matching Part Numbers


Your Shopping Cart is Empty
         

Germanium Wedged Windows


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

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

WW91050

Ø1"

WW90530-E3

Ø1/2"

Related Items


Please Wait
Wedged Window Selection Guide
Wavelength Range Substrate Material
150 nm - 5.0 µm Sapphire
180 nm - 8.0 µm Calcium Fluoride (CaF2)
185 nm - 2.1 μm UV Fused Silica
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
Optic Cleaning Tutorial  Optical Coatings Guide

Features

  • 30 Arcmin Wedged Windows
  • Ø1/2" and Ø1" Germanium Windows Available
  • Available Uncoated (2.0 - 16 µm) or with -E3 Broadband AR Coating (7 - 12 µm)
  • Custom AR Coatings and Sizes Available by Contacting Tech Support

Thorlabs offers Ø1/2" and Ø1" wedged germanium (Ge) windows that are uncoated or AR-coated for 7 - 12 µm. 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.

Due to its broad transmission range (2.0 - 16 µm) and opacity in the visible portion of the spectrum, germanium is well suited for IR laser applications. As shown in the Graphs tab, this substrate also acts as a longpass filter for wavelengths greater than 2 µm. In addition, germanium is inert to air, water, alkalis, and acids (except nitric acid). Germanium's transmission properties are highly temperature sensitive; in fact, the absorption becomes so large the material is nearly opaque at 100 °C and completely non-transmissive at 200 °C.

When handling optics, one should always wear gloves. This is especially true when working with germanium, as dust from the material is hazardous. For your safety, please follow all proper precautions, including wearing gloves when handling this material and thoroughly washing your hands afterward.

In addition to the germanium wedged windows offered here, Thorlabs also offers wedged windows with other substrate materials (see the selection guide above and 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 our standard AR coatings or custom sizes and thicknesses are available; please contact Tech Support for more information. We also supply planar windows with a variety of substrate materials and coating options. We also supply planar windows with a variety of substrate materials and coating options.

All of these germanium wedged windows can be ordered uncoated or with a 7 - 12 µm AR coating (designated as -E3).

Thorlabs' high-performance -E3 broadband AR coating has an average reflectance of less than 1.0% (per surface) across its specified wavelength range (denoted by the shaded blue area in the Coating graph below). The AR coating provides good performance for angles of incidence (AOI) between 0° and 30° (0.5 NA). The substrate transmission graph below shows the transmission of light through an uncoated Ge substrate. Please contact Tech Support to order optics with custom coatings or sizes.

Uncoated Ge Window

Ge Window Transmission
Click to Enlarge
Click for Raw Data
This graph shows the full scale measured transmission of an uncoated germanium window at normal incidence.
Ge Window Transmission
Click to Enlarge

Click for Raw Data
This graph shows the measured transmission of an uncoated germanium window at normal incidence in the visible wavelength range. The values reported in the visible and near infrared are limited by the noise floor of the spectrometer used. Please note that out-of-band transmission is not monitored during production and will vary from lot to lot.

Ge Window, AR Coated for 7 - 12 µm

AR-Coated Germanium Reflectance
Click to Enlarge

Click for Raw Data
This plot gives the measured reflectance (per surface) at normal incidence of our AR-coated germanium window. The average reflectance is <1.0% per surface within the shaded wavelength range of 7 µm - 12 µm.

Click to Enlarge

Click for Raw Data
Shown above is a graph of the measured transmission of a 5 mm thick AR-coated germanium substrate. The blue shaded region denotes the 7 - 12 μm spectral range where we suggest using these Ge wedged windows. For this wavelength range, the measured transmission is in excess of 90%.

Posted Comments:
No Comments Posted
Window Selection Guide (Table Sorted by Wavelength)
Substrate and Window Type Wavelength Range Available AR Coatings Reflectance over AR Coating Rangea Transmission Data Reflectance Data
Sapphire:
Flat or Wedged
150 nm - 5.0 μm Uncoated -
Raw Data
-
 -D Coating, 1.65 - 3.0 µm Ravg < 1.0% at 0° AOI
Raw Data

Raw Data
 -E1 Coating, 2.0 - 5.0 µm Ravg < 1.50%, Rabs < 3.0% (per Surface, 2.0 - 5.0 µm);
Ravg < 1.75% (per Surface, 2.0 - 4.0 µm) at 0° AOI

Raw Data

Raw Data
Calcium Fluoride (CaF2):
Flat or Wedged
180 nm - 8.0 μm  Uncoated -
Raw Data
-
-D Coating, 1.65 - 3.0 µm Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data

Raw Data
UV Fused Silica:
FlatWedgedV-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)
Ravg < 0.5% at 0° AOI -
Raw Data
-C3 Coating, 261 - 266 nm
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C6 Coating, 350 - 450 nm
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
 -A Coating, 350 - 700 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
 -B Coating, 650 - 1050 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
 -C Coating, 1050 - 1700 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
Magnesium Fluoride (MgF2):
Flat or Wedged
200 nm - 6.0 μm Uncoated -
Raw Data
-
Barium Fluoride (BaF2):
Wedged 
(Flat BaF2 Windows
Available Below)
200 nm - 11 µm Uncoated -
Raw Data
-
-E1 Coating, 2 - 5 µm  Ravg < 1.25%; Rabs < 2.5%  at 0° AOI
Raw Data
Icon
Raw Data
UV Fused Silica, for 45° AOI:
Flat or Wedged
250 nm - 1.6 µm Coating for 
250 nm - 450 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Coating for
350 nm - 1100 nm
Ravg < 2.0% at 45° AOI info
Raw Data
Coating for
400 nm - 700 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Coating for
600 nm - 1700 nm
Ravg < 1.5% at 45° AOI info
Raw Data
Coating for
700 nm - 1100 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Coating for
1200 nm - 1600 nm
Ravg < 1.0% at 45° AOI info
Raw Data
Infrasil®:
Flat
300 nm - 3 µm Uncoated -
Raw Data
 -
N-BK7:
FlatWedgedV-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)
Ravg < 0.5% at 0° AOI -
Raw Data
-C7 Coating, 400 - 700 nm
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C10 Coating, 523 - 532 nm (V-Coated) Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C11 Coating, 610 - 860 nm 
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-B Coating, 650 - 1050 nm 
(Flat or Wedged)
Ravg < 0.5% at 0° AOI -
Raw Data
-C13 Coating, 700 - 1100 nm 
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
C14 Coating, 1047 - 1064 nm
(V-Coated)
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C15 Coating, 523 - 532 nm
& 1047 - 1064 nm
(V-Coated) 
Ravg < 0.5% at 0° AOI - Click to View Index Plot
Raw Data
-C Coating, 1050 - 1700 nm 
(Flat or Wedged)
Ravg < 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 Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data

Raw Data
-E4 Coating, 2 - 13 µm
(Only Flat)
Ravg < 3.5%; Rabs < 6% at 0° AOI
Raw Data

Raw Data
-E2 Coating, 4.5 - 7.5 µm
(Only Flat)
Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data

Raw Data
-E3 Coating, 7 - 12 µm
(Only Wedged)
Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data
Icon
Raw Data
-G Coating, 7 - 12 µm
(Only Flat)
Ravg < 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)
Ravg < 1.25%; Rabs < 2.5% at 0° AOI
Raw Data
Icon
Raw Data
-E Coating, 3 - 5 µm
(Only Flat)
Ravg < 2% at 0° AOI
Raw Data

Raw Data
Germanium (Ge):
Flat or Wedged
2.0 - 16 μm Uncoated -
Raw Data
-
-C9 Coating, 1.9 - 6 µm
(Only Flat)
Ravg < 2% at 0° AOI
Raw Data

Raw Data
-G Coating, 7 - 12 µm
(Only Flat)
Ravg < 1% at 0° AOI
Raw Data

Raw Data
-E3 Coating, 7 - 12 µm
(Only Wedged)
Ravg < 1.0%; Rabs < 2.0% at 0° AOI
Raw Data
Icon
Raw Data
Barium Fluoride (BaF2):
Flat 
(Wedged BaF2 Windows Available Above)
3 - 5 μm -E Coating, 3 - 5 µm Ravg < 2% at 0° AOI
Raw Data

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

Germanium Wedged Windows, Uncoated

Item # WW90530 WW91050
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 Flatnessa ≤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
Wavelength Range 2.0 - 16 µm (Uncoated)
Substrate Germaniumb
Transmission Data
(Click for Graph)

Raw Data
  • Measured at 633 nm
  • Click Link for Detailed Specifications on the Substrate
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
WW90530 Support Documentation
WW90530Ø1/2" Wedged Germanium Window, Uncoated
$148.13
Today
WW91050 Support Documentation
WW91050Ø1" Wedged Germanium Window, Uncoated
$187.01
Today

Germanium Wedged Windows, AR Coating: 7 - 12 µm

Item # WW90530-E3 WW91050-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 Flatnessa ≤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 7 µm - 12 µm (-E3 Coating)
Reflectance over AR Coating Rangeb Ravg < 1.0% (per Surface)
Rabs < 2.0% (per Surface)
Both Sides are Coated
Transmission over AR Coating Rangeb Tavg > 94%
Tabs > 90%
Reflectance Data
(Click for Graph)
Icon
Raw Data
Substrate Germaniumc
Transmission Data
(Click for Graph)

Raw Data
  • Measured at 633 nm
  • For Normal Incidence
  • Click Link for Detailed Specifications on the Substrate
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
WW90530-E3 Support Documentation
WW90530-E3Customer Inspired! Ø1/2" Wedged Germanium Window, AR Coating: 7 - 12 µm
$144.20
Today
WW91050-E3 Support Documentation
WW91050-E3Customer Inspired! Ø1" Wedged Germanium Windows, AR Coating: 7 - 12 µm
$206.00
Today
Log In  |   My Account  |   Contact Us  |   Careers  |   Privacy Policy  |   Home  |   FAQ  |   Site Index
Regional Websites: West Coast US | Europe | Asia | China | Japan
Copyright 1999-2019 Thorlabs, Inc.
Sales: 1-973-300-3000
Technical Support: 1-973-300-3000


High Quality Thorlabs Logo 1000px:Save this Image