Calcium Fluoride(CaF2) Lens

Calcium Fluoride (CaF2) Lenses are made of calcium fluoride substrate. Calcium fluoride material has a wide transmission spectrum range (180nm-8.0μm), with high damage threshold, low fluorescence, high uniformity and soft physical properties, is used as a basis for a variety of optical components.

Key Features

Ultra-wide transmission range

Its transmission band covers ultraviolet, visible, and mid-infrared (approximately 0.13-10 μm). It is almost a standard choice, especially in the deep ultraviolet below 180 nm and the mid-infrared band of 3-5 μm.
$Low refractive index and low dispersion$
Low refractive index and low dispersion

With a refractive index of approximately 1.35-1.51 and an Abbe number as high as 95, it effectively reduces surface reflection loss and significantly reduces chromatic aberration, making it an ideal material for high-quality imaging systems.
High laser damage threshold

It can withstand extremely high laser energies, making it ideal for use with high-power laser sources such as excimer lasers.
Physical and chemical properties

It exhibits superior moisture resistance compared to other fluorides, is twice as hard as barium fluoride, and possesses excellent optical homogeneity and no birefringence.

Specification of Calcium Fluoride(CaF2) Lens

Material	Calcium Fluoride (CaF2)
Focal length tolerance	± 3%
Dimension tolerance	± 1%
Thickness tolerance	± 0.03mm
Surface accurcay	△/v=0.3nm
Surface quality	10/5
Centration	< 1 arc min
Clear aperture	> 90%
Chamfer	< 0.1

Typical Application Areas

Laser technology

Used for optical path construction in excimer lasers and mid-infrared quantum cascade lasers (QCLs).
Spectroscopic analysis

Covers a wide wavelength range, suitable for ultraviolet, visible, and infrared spectrometers.
Imaging systems

Used in apochromatic lenses, high-resolution microscopes, ultraviolet lithography machines, and astronomical observations.
Infrared thermal imaging

Applied to mid-wave infrared (MWIR) thermal imaging systems.