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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

25mm N-BK7 Wedged Window

Stock #34-245
Qty 1-5
Qty 6+
Volume Pricing
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Clear Aperture CA (mm):
Diameter (mm):
25.00 +0.0/-0.10
Thickness (mm):
3.00 ±0.20
Coefficient of Thermal Expansion CTE (10-6/°C):
7.1 (-30 to +70°C)
8.3 (+20 to +300°C)
Fine Ground
Index of Refraction nd:
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Flatness:
λ/10 over 25mm Aperture
Surface Quality:
Wedged Window
Wavelength Range (nm):
350 - 2200
Young's Modulus (GPa):
Wedge Angle:
30 ±10 arcmin

Regulatory Compliance

RoHS 2015:
Reach 219:

Product Family Description

TECHSPEC® N-BK7 Wedged Windows are available in standard metric sizes with a 30 arcminute wedge. The wedge of these windows eliminate Etalon effects by preventing back surface reflections from traveling along the same optical path as the transmitted beam. In laser cavities, wedged windows help prevent laser instability, mode-hopping, and power spikes caused by these unwanted reflections. TECHSPEC N-BK7 Wedged Windows are often used as a cost-effective alternative to Fused Silica Wedged Windows in applications that do not require UV transmission or where high thermal stability is not required such as with low power visible or NIR lasers. Wedged windows can also be used as beam samplers or beam pick-off optics to monitor laser beam properties such as beam power over time.