Cr⁴⁺: YAG (Chromium Doped Yttrium Aluminum Garnet)

Cr⁴⁺:YAG is an excellent crystal for passively Q-switching at wavelength from 0.8 to 1.2μm for both diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Nd:YVO₄ or other Nd and Yb doped lasers. It has high damage threshold (>500 MW/cm2),good thermal conductivity and chemical stability, durability, and is easy to use, it will replace traditional LiF and Dye and color center amterials for passive Q-switching lasers. which are commonly used as passive Q-switching materials. Cr⁴⁺:YAG is also an useful lasing material, with output from 1350 nm to 1600 nm (tunable).

Q&W provides Cr⁴⁺: YAG with Cr⁴⁺ doping level from 0.5 mol% to 3 mol% The size could be from 2*2mm² to 14*14mm² with length from 0.1mm to 12 mm available. We can control the initial transmission from 5% to 95% on request.

The preliminary experiments of Q&W¡¯s Cr:YAG showed that the pulse width of passively Q-switched lasers could be as short as 5 ns 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.

Cr:YAG is also a laser crystal with tunable output from 1.35μm to 1.55μm. It can generate ultrashort pulse laser (to fs pulsed) when pumped by Nd: YAG laser at 1.064μm.

Typical size of Cr4+:YAG:

Ø 5 mm x appr.1 mm unsaturated Transmission = 90% AR 1064 nm

Ø 5 mm x appr.1 mm unsaturated Transmission = 95% AR 1064 nm

Ø 5 mm x appr.1 mm unsaturated Transmission = 40% AR 1064 nm

Ø 5 mm x appr.1 mm unsaturated Transmission = 60% AR 1064 nm

Ø 5 mm x appr.1 mm unsaturated Transmission = 70% AR 1064 nm

Ø 5 mm x appr.1 mm unsaturated Transmission = 80% AR 1064 nm

Ø 9.5 mm x 1.53 mm unsaturated Transmission = 90% AR 1064 nm

Ø 9.5 mm x 1.60 mm unsaturated Transmission = 85% AR 1064 nm