CdSe

CdSe
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Cadmium selenide (CdSe) crystals are Ⅲ-Ⅰ cluster compound semiconductors with a wide infrared transparent band (0.75~25 μm), large nonlinear coefficient (d31=18 pm/V), and suitable birefringence, meanwhile. CdSe crystals also have the following advantages:

  • Good chemical stability
  • No deliquescence
  • Moderate mechanical strength
  • Good processing performance

They can be frequency-converted in the infrared band, which is a kind of performance. CdSe crystals also have the advantages of good chemical stability, deliquescence, mechanical strength, and good processing performance. It can be used to prepare infrared nonlinear optical devices.

Features of Cadmium Selenide (CdSe) Crystals:

  • Wide transmittance range
  • very nonlinear
  • small walk-off angle
  • low light absorption
  • good mechanical properties
  • small departure angle
  • Broadband-specific transmission range: 1.6μm to 2.5μm high laser damage threshold

Basic Parameters

StructureHexagonal System,6mm
Density5.81 g/ cm3
Young's Modulus5×1011 dyne/cm2
Coefficient of Thermal Expansion(500 K)a1=6.26×10-6/K;
a3=4.28×10-6/K
Specific Heat0.49 J/(g•K)
Thermal Conductivity (@ 25 °C)0.04 W/cmK
Maximum Transmittance(λ =2.5-15 µm )≥ 71 %
Absorption Coefficient. (λ =10.6 µm )≤ 0.0015 cm-1 (Includes 2 surfaces)
Refractive Index(λ =10.6 µm )2.4258 (no), 2.4437 (ne)
Sellmeier方程@T=293 K(λ in μm)no2=4.2243+1.7680λ2/(λ2-0.2270)+3.1200λ2/ (λ2 - 3380);
ne2=4.2009+1.8875λ2/(λ2-0.2171)+3.6461λ2/ (λ2 - 3629)
Mohs Hardness3.25
Damage Threshold60MW/cm2@10.6µm ，200 ns
Transparent Range0.7-24µm
Optical SymmetryPositive uniaxial(ne>no)
Lattice ParametersÅa=4.2985，
c=7.0150
ResistivityLow resistance: < 1 Ohm*cm 
High resistance: > 1011 Ohm*cm
Thermal Conductivity6,9 (||c) Wm-1K-1, 6,2 (⊥c) Wm-1K-1
Melting Point1240℃
Bandgap1.74eV
Nonlinearity Coefficientd31 = 18 pm/V

Spectrum

CdSe nonlinear crystal transmission crylink

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