BBAR (1650-3000nm) Coated, Calcium Fluoride Window

Key Features:

  1. Low Absorption, High Transmission UV Grade Calcium Fluoride:
    • High Transmission: Provides high transmission across a broad wavelength range from 200 nm to 7000 nm when uncoated.
    • Low Absorption: Ensures minimal loss of signal, making it ideal for high-performance optical systems.
  2. Low Index of Refraction:
    • Optical Performance: The low index of refraction reduces reflection losses, enhancing the overall transmission efficiency of the optical system.
  3. AR Coatings Available:
    • Coating Range: Anti-reflection (AR) coatings are available for wavelength regions spanning 250 – 5000 nm, further improving transmission and reducing 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): 4.50
Clear Aperture (%): 90
Diameter (mm): +0.0/-0.1
Thickness (mm):  ±0.1
Coating: BBAR (1650-3000nm)
Coating Specification: R_avg <1% @ 1650-3000nm<br>R_abs <2% @ 1650-3000nm
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): 1650 – 3000
Axis Orientation: Random
Young’s Modulus (GPa): 75.8

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 1650 – 3000 nm. The BBAR coating ensures minimal reflection losses, making them suitable for laser systems, spectroscopy, and other precision optical applications.


  1. Laser Systems:
    • Excimer Lasers: The high bulk damage threshold and low absorption make CaF2 windows suitable for use in 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 that require 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 are 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: Also available in a wedged design to minimize interference effects and improve measurement accuracy.

Specifications for Calcium Fluoride (CaF2) Windows:

Parameter Specification
Diameter (mm): Customizable
Coating Options: Uncoated, AR Coated (250 – 5000 nm)
Wavelength Range (nm): 200 – 7000
Index of Refraction n_d: 1.434
Surface Quality: 60-40
Bulk Damage Threshold: High
Design Options: Standard, Wedged


SHAPE OPTICS Calcium Fluoride (CaF2) Windows are designed for high-performance optical applications, providing low absorption and high transmission from 200 nm to 7000 nm. Available with various AR coatings and in both standard and wedged designs, these windows are ideal for laser systems, protective applications in gas detectors and thermal imaging, and UV spectroscopy systems. The low index of refraction and high bulk damage threshold make CaF2 windows a versatile and reliable choice for demanding optical environments.

Additional information

Weight 0.5 kg
Dimensions 12 × 10 × 8 cm


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