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Cr:ZnSe Laser Crystal

22 May 2019

Description

Cr: ZnSe laser crystal has the advantages of normally no excited state absorption and upper level conversion, an extremely broad absorption band and large emission cross-section, superb fluorescence quantum efficiency at room temperature and extra broad emission width as well as good chemical and mechanical properties, which make it become an excellent source of efficient and powerful tunable mid infrared laser. Because of mid infrared wavelength band is the window of atmosphere, the Cr: ZnSe laser crystal has important application prospect in the field of photo-communication, pollution gas detection, industrial combustion product test and so on.

 

Parameter

Material and Specifications

Crystal structure Cubic
Poisson Ration 0.28
Thickness/Diameter Tolerance ±0.05mm
Orientation Tolerence < 0.5°
Surface Flatness <λ/8@632nm
Wavefront Distortion <λ/4@632nm
Surface Quality 10-5(MIL-O-13830A)
Parallel 30〞
Perpendicular 15ˊ
Clear Aperture >90%
Chamfer <0.2×45°
Melting Point 1520 ºC

Physical and Chemical Properties

Thermal Expansion Coeff. @20ºC 1.5×10-6/ºC
Thermal Conductivity Coeff. @20ºC 14 W/m/ºK
 Specific Heat 0.79 J/g K
Density 5.27 g/cm³
Durability Knoop Hardness 112 kgf/mm²
Mohs Hardness 8.5
Young‘s Modulus 67 GPa
Modulus of Rupture 55 MPa
Orientation or

Optical and Spectral Properties

Laser Wavelengths 2150 – 2600 nm
Emission Linewidth  
Emission Cross-section (@1064nm) 9×10-19 cm²
Intrinsic Loss @1064nm -1
Refractive Index (n) @ 1650nm 2.455
Thermal Optical Coeff. (dn/dT) @nm  61×10-6/ºC

Absorption and Emission Spectrum

Feature

  • Broad tunability (lasing from 2.1-3.1 μm)

  • Broad absorption bands

  • Large gain cross section (σemission ~ 9 × 10-19 cm2)

  • Minimal problem of excited state absorption (no spin-allowed excited state transitions from the upper laser level)

  • High thermal conductivity − better than YAG (18 W/m·K in ZnSe versus 13 W/m·K in YAG)

  • High IR (0.6-20 μm) transparency

Application 

  • Surgery

  • Remote sensing

  • Dentistry

  • Free space communications

  • Military applications

CONTACT DETAILS
Nanjing Crylink Photonics Co.,Ltd
No.3, Hengda Road, Economic and Technological Development Zone, Nanjing, China
No.200,Zhaoxian Road,Jiading District,Shanghai City
Nanjing
Jiangsu
210038
China
Tel: (86)025-68790684
Fax: (86)025-68790685
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