Cr4+:YAG crystal

Cr4+:YAG is an ideal material for passive Q-switching of Nd:YAG and other Nd or Yb doped laser in the wavelength range of 0.8 to 1.2 μm. One of the remarkable feature of Cr4+:YAG is high damage threshold of 500-1000MW/cm2. Passive Q-Switching is preferred for simplicity of manufacturing and operation, low cost and reduced system size and weight.

The preliminary experiments of Cr4+:YAG shows that the pulse width of passively Q-switched lasers could be as short as 9ns for diode pumped Nd:YAG lasers and repetition as high as 10kHz for diode pumped Nd:YVO4 lasers. Furthermore, an efficient green output @532nm, and UV output @355nm and 266nm were generated, after a subsequent intracavity SHG in KTP or LBO, THG and 4HG in LBO and BBO for diode pumped and passive Q-switched Nd:YAG and Nd:YVO4 lasers.

  Orientation   <111> or <100> crystalline direction
  Wavefront distortion   λ/8 per inch @633nm
  Surface quality   10/5 Scratch / Digper MIL-O-1380A
  Parallelism   <10 arc seconds
  Perpendicularity   <5 arc minutes
  Clear Aperture   >90%
  Transmission Tolerance   ±3%
  Flatness   <λ/10 @633nm
  Anti-Reflection Coating   R<0.20% @1064nm per surface