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Cr:LiSAF|Cr4+:YAG|Nd:GdVO4|Nd:KGW|Nd:YAG|Nd:YVO4|Ti:Sapphire| Yb:KGd(WO4)2 |Yb:YAG|


Chromium Doped Yttrium Aluminum Garnet Crystal (Cr4+:YAG) is an excellent crystal for passively Q-switching diode pumped or lamp-pumped Nd:YAG, Nd:YLF, Nd:YVO4 or other Nd and Yb doped lasers at wavelength from 0.8 to 1.2 µm. It is chemically stable, durable, UV resistant, good thermal conductivity, high damage threshold (> 500 MW/cm2) and easy to be operated.

Chromium(IV)-doped YAG (Cr:YAG) provides a large absorption cross section in the 0.9-1.2 micrometer spectral region, which makes it an attractive choice as a passive Q-switch for Nd-doped lasers. The resulting devices are solid-state, compact and low-cost. It has high damage threshold, good thermal conductivity, good chemical stability, is resistant to ultraviolet radiation, and is easily machined. It is replacing the more traditional Q-switching materials like lithium fluoride, organic dyes and color centers. The dopant levels range between 0.5-3 molar %.

It can be used for passive Q-switching the diode or lamp pumped Nd:YAG, Nd:YLF, Nd:YVO4, Yb:YAG, and other neodymium and yttrium doped lasers at wavelengths between 1000-1200 nm.

Cr:YAG can be also used for tunable lasers with output adjustable between 1350-1550 nm. It can generate ultrashort (down to femtoseconds range) pulses when pumped at 1064 nm by a Nd:YAG laser.

Cr:YAG was demonstrated in a non-linear optics application as a self-pumped phase-conjugated mirror in a Nd:YAG loop resonator. It provides compensation of both phase and polarization aberrations induced into the loop resonator.


The preliminary experiments of Cr4+:YAG showed that the pulse width of passively Q-switched lasers could be as short as 5ns for diode pumped Nd:YAG lasers and repetition rate 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.

Basic Properties of Cr4+:YAG:

Chemical Formula: Cr4+:Y3Al5O12
Crystal Structure: Cubic Garnet
Density: 4.56g/cm^3
Hardness: Mohs 8.5
Thermal Conductivity: 12.13W/m.K
Refractive Index: 1.82 @ 1064 nm
Base state absorption cross section: 4.3x10^-18 cm^2
Emission state absorption cross section: 8.2x10^-19 cm^2
Fluorescence lifetime: 3.4µs

General Specifications

1) Aperture: 2x2mm to 15x15mm
2) Length: 0.1mm to 12mm
3) Initial Transmission: 10% to 99%
4) Surface Quality: better than 10/5 scratch/dig Per MIL-0-13830A
5) Parallelism: < 10"
6) Transimission Wavfront Distortion: < 1/8 @633nm
7) Coating: R<0.1%@1064nm or upon customer's specification
8) Damage Threshold: > 500 MW/cm2
9) Dopant Level: 0.5 mol% ~ 3 mol%

Diffusion Bonded Nd:YAG/Cr4+:YAG crystals are available in OptoCity. These Diffusion Bonded Crystals are combined by optical contact method and further bonded under high temperature.

RFQ PartNo Descrption NetPrice LeadTime
[?] DNY03-10 Diffusion Bonded Nd:YAG/Cr4+:YAG Dia. 3 T=10 AR/AR @1064nm $395.00 5- 7 days
[?] CrYAG510 5mm Aperture To=10% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG520 5mm Aperture To=20% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG530 5mm Aperture To=30% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG540 5mm Aperture To=40% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG550 5mm Aperture To=50% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG560 5mm Aperture To=60% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG570 5mm Aperture To=70% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG580 5mm Aperture To=80% AR/AR @1064nm with 1" holder $295.00 5 - 7 days
[?] CrYAG590 5mm Aperture To=90% AR/AR @1064nm with 1" holder $295.00 5 - 7 days

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