CdSe

Density                      5.81 g/ cm3


Absorption Coef.         ≤ 0.0015 cm-1 


Surface quality           As-cut, 60/40




CdSe  Laser systems with CdSe crystal have obvious advantage – much broader tuning range . In the difference-mixing of the output of parametric oscillator in CdSe to obtain the phase matched 9.4-24.3 µm tuning range . CdSe crystal has its band edge in the near infrared and shows transmission far into the infrared. The long wavelength limit determined by the onset of lattice absorption 1.5 cm-1 @ 24.3µm.

There is also a narrow impurity absorption centered at 18.5um which varies from one crystal to another. As a nonlinear optical material, CdSe crystal was explored for OPG, OPO and DFG in 1970’s .First of all, picoseconds pulses tunable from 10 to 20 µm were produced .Furthermore, CdSe was also used to achieve megawatt peak power in the range of 8-13 and 7-12  µm, based on OPG and OPO respectively.

Basic properties

Structure: 

Wurtzite (Hexagonal)

Density:

5.81 g/ cm3

Young’s Modulus:

5×1011 dyne/cm2

Coef. of Thermal Expansion (500 K): 

α 1=6.26×10-6/K;  α 3=4.28×10-6/K

Specific Heat:   

0.49 J/gK

Thermal conductivity (at 25 °C): 

0.04 W/cmK

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): 

 no= 2.4258, ne=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

Absorption coefficient of CdSe α [cm-1]

Laser Damage Threshold of CdSe

λ [μm]

τp [ns]

Ithr×10-12 [W/m2]

Ref

1.833

200

0.3

[65]

1.995

20

0.5

[68]

2.36

35

0.5

[60]

10.6

200

0.6

[69]

OPO Properties and phase matching angle of CdSe

Interacting wavelength [μm]

θ exp [deg]

Ref

θ theor [deg]

SFGo + e  o

 

 

 

 

16.4+3.479 2.87

73.7

[64]

71.3

72.4

15.96+2.281.995

62.2

[68]

64.2

64.6

14.1+3.6042.87

70.9

[64]

68.9

69.7

13.7+2.84922.3587

65

[71]

65.2

65.5

10.6+2.722.1646

70.5

[62]

70.4

70.5

10.361+2.2271.833

78

[72]

78.7

78.5

9.871+2.2511.833

84

[72]

83.9

83.5

9.776+2.2561.833

90

[72]

85.8

85.1







Customized

You can customise this product to your needs. If you do not find suitable specifications for your application please contact us for custom solution.