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Material

ZnGeP2

Dimension Tolerance(mm)

±0.1

Surface Quality

10/5

Flatness

<λ/6@633nm

Wavefront Distortion

λ/8

Parallelism(arcsec)

<20

Mount

Unmounted

Crystal symmetry

Tetragonal

Point group

42m

Lattice Constants, Å                                                      a

                                                                         c

5.465

10.771

Density

4.175

Optical Properties

Optical transmission, µm

0.74–12

Indices of Refraction at

3.2324 

3.2786

3.1141 

3.1524

3.0725 

3.1119

3.0

0.03

0.02

0.02

0.4

0.8

Nonlinear Optical Properties

Laser damage threshold, MW/cm²

60

at pulse duration, ns

100

at wavelength, µm

2.05

Nonlinearity, pm/V

111

Phase matching angle for Type 1 SHG at 10.6µm, deg

76

Walk-off angle at 5.3µm, deg

0.57

Thermal Properties

Melting point, °C

1298

Thermal Expansion Coefficient, 10^-6/°K

17.5

9.1

||

1.59

||

8.08

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