NIR II Coated, Calcium Fluoride Window

Key Features:

  1. Low Absorption, High Transmission UV Grade Calcium Fluoride:
    • High Transmission: Provides excellent transmission from 200 nm to 7000 nm when used uncoated.
    • Low Absorption: Ensures minimal signal loss, making it ideal for high-performance optical applications.
  2. Low Index of Refraction:
    • Optical Performance: The low index of refraction reduces reflection losses, enhancing the overall transmission efficiency.
  3. AR Coatings Available:
    • Coating Range: Anti-reflection (AR) coatings are available for wavelength regions spanning 250 – 5000 nm, improving transmission and minimizing back reflections.
  4. Wedged Windows Available:
    • Design Options: CaF2 windows are also available in a wedged design to prevent interference fringes and reduce etalon effects in high-precision applications.




SHAPE OPTICS Calcium Fluoride (CaF2) Vacuum UV Grade Window Specifications

Parameter Specification
Abbe Number (v_d): 94.99
Bevel: Protective as needed
Clear Aperture CA (mm):
Clear Aperture (%): 90
Diameter (mm):  +0.0/-0.1
Thickness (mm):  ±0.1
Coating: NIR II (750-1550nm)
Coating Specification: R_abs ≤1.5% @ 750 – 800nm<br>R_abs ≤1.0% @ 800 – 1550nm<br>R_avg ≤0.7% @ 750 – 1550nm
Density (g/cm³): 3.18
Coefficient of Thermal Expansion CTE (10^-6/°C): 18.85
Edges: Fine Ground
Index of Refraction n_d: 1.434
Knoop Hardness (kg/mm²): 158.3
Poisson’s Ratio: 0.26
Parallelism (arcmin): <1
Substrate: Calcium Fluoride (CaF2), Vacuum UV Grade
Surface Quality: 40-20
Surface Flatness (P-V): λ/2
Type: Protective Window
Wavelength Range (nm): 750 – 1550
Axis Orientation: Random
Young’s Modulus (GPa): 75.8
Damage Threshold, By Design: 8 J/cm² @ 1064nm, 10ns

These specifications provide detailed information about the SHAPE OPTICS Calcium Fluoride (CaF2) Vacuum UV Grade Window. Designed for high-performance optical applications, these windows offer low absorption and high transmission with a broad wavelength range of 750 – 1550 nm. The NIR II coating ensures minimal reflection losses, making them suitable for laser systems, spectroscopy, and other precision optical applications.

SHAPE OPTICS Calcium Fluoride (CaF2) Windows


  1. Laser Systems:
    • Excimer Lasers: The high bulk damage threshold and low absorption make CaF2 windows suitable for excimer laser systems.
    • General Laser Systems: Ideal for a variety of laser systems requiring high transmission and low absorption.
  2. Protective Windows:
    • Gas Detectors: Suitable for use as protective windows in gas detectors operating in the Vacuum UV (VUV) and MWIR regions.
    • Thermal Imaging: Excellent for cryogenically cooled thermal imaging systems where high transmission in the MWIR is required.
  3. Spectroscopy Systems:
    • UV Spectroscopy: Perfect for UV spectroscopy systems due to their high transmission in the UV range.
    • Wideband Substrates: Used as substrates for coatings requiring wideband substrate transmission.

Product Description:

  1. Material Properties:
    • High Transmission: Uncoated CaF2 windows provide high transmission from 200 nm to 7000 nm.
    • AR Coatings: Various AR coatings available to enhance performance in specific wavelength regions.
  2. Design Options:
    • Standard Windows: Available in standard flat window designs for general optical applications.
    • Wedged Windows: Available in a wedged design to minimize interference effects and improve measurement accuracy.
  3. Durability Note:
    • Soft Material: Calcium fluoride is relatively soft and more susceptible to scratches compared to typical glass windows. Handle with care to maintain optical quality.


SHAPE OPTICS Calcium Fluoride (CaF2) Windows are designed for high-performance optical applications requiring low absorption and high transmission across a wide wavelength range. Available with various AR coatings and in both standard and wedged designs, these windows are suitable for laser systems, protective applications, and spectroscopy systems. Despite their excellent optical properties, calcium fluoride is relatively soft and should be handled with care to prevent scratches.

Additional information

Weight 0.5 kg
Dimensions 12 × 10 × 8 cm


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