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25.4mm Dia., 4mm Thick, 30' Wedge, BBAR (2000-5000nm) Coated, ISP Optics Calcium Fluoride (CaF2) Wedged Window

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Calcium Fluoride (CaF2) Wedged Windows

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Specifications

General

Type:
Protective Window

Physical & Mechanical Properties

Bevel:
Protective as needed
Clear Aperture (%):
85
Clear Aperture CA (mm):
21.59
Diameter (mm):
25.40 +0.0/-0.13
Thickness (mm):
4.00 ±0.13
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
158.3
Poisson's Ratio:
0.26
Young's Modulus (GPa):
75.8

Optical Properties

Abbe Number (vd):
94.99
Axis Orientation:
Random
Coating:
BBAR (2000-5000nm)
Coating Specification:
Ravg <1.5% @ 2000-5000nm
Rabs <3.0% @ 2000-5000nm
Ravg <1.75% @ 2000-4000nm
Index of Refraction (nd):
1.495
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Surface Flatness (P-V):
2λ @ 633nm
Surface Quality:
60-40
Wavelength Range (nm):
2000 - 5000
Wedge Angle:
30' ±15

Material Properties

Coefficient of Thermal Expansion CTE (10-6/°C):
18.85
Density (g/cm3):
3.18

Regulatory Compliance

RoHS 2015:
Certificate of Conformance:
Reach 235:

Product Details

ISP Optics Calcium Fluoride (CaF2) Wedged Windows feature a 30 arcmin wedge to eliminate fringe patterns from etalon effects and to prevent cavity feedback. Calcium fluoride’s combination of low absorption and high damage threshold make these windows a popular choice for free-space lasers. Its low refractive index allows it to be used without an anti-reflective coating. ISP Optics Calcium Fluoride (CaF2) Wedged Windows feature low water solubility and offer superior hardness compared to other fluoride-based substrates, making them suitable for laser applications in harsh environments. Calcium Fluoride (CaF2) Wedged Windows provide laser output protection from environmental effects and are ideal for beam sampling applications.

Technical Information

Special Handling

These optics require special handling to avoid damage and ensure long-term performance. Proper handling, cleaning, and storage are essential to maintain optical quality. Explore our Optics Cleaning Resources for step-by-step guides and best practices. For personalized assistance, Email us or Chat with our technical support team.

Related Products

Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

  • Custom dimensions, materials, coatings, and more
  • High-precision surface quality and flatness
  • Tight tolerances and complex geometries
  • Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.

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