Cr4+:YAG

Chromium-doped yttrium aluminum garnet crystal (Cr:YAG) is an excellent performance passive Q-switched crystal widely used in dymium-doped YLF, neodymium-doped yttrium vanadate and passively Q-doped Q-doped lasers with wavelengths of 0.8 to 1.2um. Due to its superior chemical stability, resistance to UV radiation and good thermal conductivity, as well as its high damage threshold, Cr:YAG has become a very popular passive Q-modulating material.

Q-modulated principle: In passive Q-modulated lasers, Cr:YAG is used as a saturated absorber. It first absorbs light from the pump source, and when the absorption reaches saturation, it quickly releases the light, resulting in a high-intensity, short-pulse laser output. This release of light produces high-intensity, short-duration pulses that are typical of passively Q-switched lasers.

 

General parameters

 

Form Tolerance(mm)	±0.1	Effective aperture(mm)	＞90%
Face	＜λ/10@633nm	Eccentricity	＜20〞
Finish	20/10	Design wavelength(nm)	1064
Coating	Both end faces are coated with anti-reflection film, and the residual reflectivity on one side is residual R＜0.5%@1064nm

Peculiarity 

• Crystal structure: Cr:YAG crystals have a cubic crystal structure and the chemical formula is Cr:Y3Al5O12.
• Optical characteristics: It has a wide absorption band in the near-infrared region, which can effectively absorb light in the wavelength range of 900 to 1200 nanometers, reaching an absorption peak at about 1060nm, and its absorption peak cross-sectional area is large.
• Thermal Properties: Cr:YAG has high thermal conductivity and good thermal stability, allowing for effective heat dissipation and stability during high-power operation.
• Mechanical Properties: The crystal has high mechanical strength and hardness, with a hardness of around 8.5 on the Mohs scale.
• Chemical stability: Cr:YAG crystals have good chemical stability and can resist UV radiation and chemical corrosion, making them suitable for various harsh environments.

Physical and optical properties