Passive Q-switch Crystals

  • Chromium Doped Yttrium Aluminum Garnet (Cr4+:YAG) Crystal is excellent E-O material for passively Q-switching diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Nd:YVO4 and other Nd (or Yb) doped lasers at wavelength 0.8~1.2µm. With the advantages of chemically stable, durable, UV resistant, good thermal conductivity, high damage threshold ( >500 MW/cm2) and easy to be operated, Cr4+:YAG is edging out traditional materials, such as LiF, organic Dye and color centers.  
  • Co2+:MgAl2O4 (Co2+:Spinel or Co:MALO) is a relatively new material for passive Q-switching in lasers emitting from 1.2 to 1.6 µm, in particular, for eye-safe 1.54 µm Er:glass laser, but also works at 1.44 µm and 1.34 µm wavelengths. High absorption cross section (3.5 × 10-19cm2) permits Q-switching of Er:glass laser without intracavity focusing both with flash-lamp and diode-laser pumping. Negligible excited-state absorption results in high contrast of Q-switch, i.e. the ratio of initial (small signal) to saturated absorption is higher than 10. Hangzhou Shalom EO offer the high quality Co:Spinel crystals materials with laser grade polishing and coatings.
  • V3+:YAG is a relatively new material for saturable absorber passive Q-switching in lasers emitting from 1.06 to 1.44 µm, in particular, for 1.3 um Nd-lasers. Extremely high ground state absorption (GSA) cross section of 7x10-18 cm2 near 1.3 m and negligible excited state absorption (ESA) permits Q-switching of 1.3 and 1.44 m Nd-lasers without intracavity focusing both with flash-lamp and diode-laser pumping.

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