CdSe

CRYLINK’s CdSe product, also known as Cadmium Selenide crystal, is a nonlinear crystal product with excellent comprehensive performance, which is widely used in solar cells, light-emitting diodes, and high-energy ray detection. The product has the characteristics of a wide transmittance band, low optical absorption, and excellent optical and electrical properties. It can be used in polarizers, beams, DFM converters, and visual parametric oscillation products.

Parameter

Parameters

Structure	Wurtzite (Hexagonal)
Growth methods	HPVB or HPVZM
Density	5.81 g/ cm³
Young’s Modulus	5×10¹¹ dyne/cm²
Coef. of Thermal Expansion (500 K)	α₁=6.26×10^-6/K; α₃=4.28×10^-6/K
Specific Heat	0.49 J/gK
Thermal conductivity (at 25 °C)	0.04 W/cmK
Eg, eV (E//<0001>, 300 K)	1.73
Eg, eV (E perpendicular to <0001>, 300 K)	1.705
Max. Transmittance (λ =2.5-15 μm)	≥ 71 %
Absorption Coef. (λ =10.6 μm)	≤ 0.0015 cm^-1 (including 2 surfaces)
Refractive index (λ =10.6 μm)	n_o= 2.4258 n_e=2.4437
Max. single crystal diameter/length	Ø50.8×40 mm
Max. IR optic blank diameter/length	Ø50×50 mm or plate 60×60×6 mm
Surface quality	As-cut, 60/40 scratch*dig per MIL-0-13830
Specific resistivity	low: < 1 Ohmcm high: > 10¹² Ohmcm

Sellmeier equation coefficients (T=300 K)

Sellmeier coefficient	CdSe n_o	CdSe n_e
A	4.1318	4.0832
B	1.8584	2.0041
C [um²]	0.21999	0.20646
D	2.7673	3.9928
E [um²]	2962.98	3866.93

Standard product (example)

Plan view size (mm)	Length (mm)	θ	PHI	Application	Coating
5×5	1	39°	45°	DFG@1, 2-2, 4μm, I type	BBar/BBar@1.2-2.4/2.4-11μm, AOI=0°
8×8	1	39°	45°	DFG@1, 2-2, 4μm, I type	BBar/BBar@1.2-2.4/2.4-11μm, AOI=0°
6×6	2	50°	0°	DFG@1, 2-2, 4μm, I type	BBar/BBar@1.2-2.4/2.4-11μm, AOI=0°
8×8	2	50°	0°	DFG@1, 2-2, 4μm, I type	BBar/BBar@1.2-2.4/2.4-11μm, AOI=0°