Cr:YAG Crystals

Cr:YAG (Chromium doped Ytterium Aluminum Garnet, Cr:Y₃Al₅O₁₂) crystal is an ideal material for passive Q-switching of Nd:YAG and other Nd or Yb doped lasers in the wavelength range of 0.8 to 1.2 μm. One of the remarkable features of Cr:YAG is its high damage threshold of 500-1000 MW/cm2. Its absorption band extends from 800 nm to 1200 nm and peaks at around 1060nm with a very large absorption cross section. Passive Q-switched lasers incorporating Cr:YAG crystals have been extensively manufactured at low cost and with reduced system size and weight.

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Model	Name	aperture	coating	application	Price	Availability	Action
CYG0064-T41-AR1064	Cr:YAG, Dia. 6.35mm, T0 =41% @1064nm, AR@1064nm	Dia 6.35mm	AR@1064nm	T0:41%	Ask	Out Of Stock
CYG0100-T50-AR1064	Cr:YAG, Dia. 10mm, T0 =50% @1064nm, AR@1064nm	Dia 10.0mm	AR@1064nm	T0:50%	Ask	Out Of Stock
CYG0045-T60-AR1064	Cr:YAG, Dia. 4.5mm, T0 =60% @1064nm, AR@1064nm	Dia 4.5mm	AR@1064nm	T0:60%	Ask	Out Of Stock
CYG0127-T70-AR1064	Cr:YAG, Dia. 12.7mm, T0 =70% @1064nm, AR@1064nm	Dia 12.7mm	AR@1064nm	T0:70%	Ask	Out Of Stock
CYG0100-T80-AR1064	Cr:YAG, Dia. 10mm, T0 =80% @1064nm, AR@1064nm	Dia 10.0mm	AR@1064nm	T0:80%	Ask	Out Of Stock
CYG0100-T90-AR1064	Cr:YAG, Dia. 10mm, T0 =90% @1064nm, AR@1064nm	Dia 10.0mm	AR@1064nm	T0:90%	Ask	Out Of Stock
CYG0127-T90-AR1064	Cr:YAG, Dia. 12.7mm, T0 =90% @1064nm, AR@1064nm	Dia 12.7mm	AR@1064nm	T0:90%	Ask	Out Of Stock
CYG0100-T95-AR1064	Cr:YAG, Dia. 10mm, T0 =95% @1064nm, AR@1064nm	Dia 10.0mm	AR@1064nm	T0:95%	Ask	Out Of Stock
CYG0100-T98-AR1064	Cr:YAG, Dia. 10mm, T0 =98% @1064nm, AR@1064nm	Dia 10.0mm	AR@1064nm	T0:98%	Ask	Out Of Stock

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Basic Properties:

Chemical Formula	Cr4+:Y₃Al5O12
Crystal Structure	Cubic garnet
Recovery time	8.5 μs
Hardness	8.5 Mohs
Density	4.56 g/cm3
Thermal conductivity	12.13 W/m/K
Refractive index	1.82 @ 1064 nm
Ground state absorption cross section	σs1=4.3x10-18 cm2
Excited state absorption cross section	σs2=8.2x10-19 cm2
Fluorescence lifetime	3.4 μs

Specifications of Cr:YAG components:

Orientation:	The rod axis is along <111> or <100>
Cr⁴⁺ concentration:	0.5 mol% ~ 3 mol%
Aperture	2x2 ~ 14x14 mm
Length:	0.1 ~ 12 mm
Initial transmission (T0):	5% ~ 99%
T0 tolerance:	+/- 2%
Flatness:	λ /8 @ 633 nm
Parallelism:	20 arc sec
Perpendicularity:	5 arc minutes
Surface finishing:	20/10 scratch/dig to MIL-O-13830A
Wavefront distortion:	less than λ/8 @ 633 nm

Anti-Reflection (AR) Coating:

AR coatings are available @ 1064 nm or other wavelengths. The typical reflectance is R < 0.20% per surface.

Typical AR coating curve @ 1064 nm: