Hellma Calcium Fluoride, Germany

Hellma Calcium Fluoride, Germany

Hellma material CaF2 crystal

Calcium fluoride (a validated optical material of CaF2Hellma Materials)

Broadband transmission: Transmittance in the ultraviolet, visibility, and infrared frequency bands.

Low dispersion: Minimize color difference to the greatest extent possible.

High resistance to ionizing radiation: can be used in space.

Low nonlinear refractive index: Very suitable for high-power laser applications.

Large diameter: For applications with high requirements, it can reach up to 440 millimeters.

Due to the high purity of the starting material, we plant large, high-purity single crystal calcium fluoride.

Thanks to these characteristics, our CaF2 crystal is the choice for the following industries:

Semiconductor industry: Micro lithography optical technology to achieve high precision.

Vacuum technology: Sturdy vacuum windows are suitable for harsh environments.

Core optical characteristics

High broadband transmittance

Covering the deep ultraviolet (130nm) to infrared (8 μ m) wavelength range, suitable for full spectrum optical systems.

For example, in excimer laser optical devices (157nm, 193nm, 248nm), the transmittance of HellmaCaF ₂ far exceeds that of traditional materials, becoming the industry standard.

Low refractive index and low dispersion

The refractive index (nd) is 1.43384, and the spectral dispersion (vd) reaches 95.23, significantly reducing optical distortion and improving imaging accuracy.

Comparison: The dispersion value of ordinary optical glass is usually below 60, while HellmaCaF ₂ has an advantage in dispersion control.

Laser durability

Under high-energy laser conditions (such as 193nm excimer laser), HellmaCaF ₂ can withstand hundreds of millions of pulse irradiation without performance degradation, and its lifespan is more than 10 times that of ordinary materials.

environmental adaptability

A large-sized crystal with a diameter of up to 420mm meets the requirements of large-scale optical systems.

Capable of withstanding high-energy particle radiation and suitable for environments such as space exploration.

Advantages of Hellma Calcium Fluoride

featurevalueadvantage

Low refractive indexnd=1.43384Very suitable for high-power laser applications

Low spectral dispersion𝜈 d=95.23Minimize color difference

Laser resistors suitable for excimer laser optics193 nautical miles, 248 nautical milesLong service life of laser components

High bandwidth transmission from deep ultraviolet to infrared range130nm到8μmTransmission performance of ultraviolet, visible and infrared bands

Available sizes for semi-finished productsUp to 440 millimeters in sizeSuitable for high demand applications

Advantages of HellmaMaterials semi-finished products:

Flexibility in material size: Tailored solutions for your specific needs.

Optimize performance: achieve high optical accuracy and efficiency.

Reliability: Trust materials that have been verified and have a long service life.

Quality control: All measurement techniques are conducted internally, including the laser laboratory.

Hellma Calcium Fluoride, Germany