Nd:YAG

Description:

Nd:YAG (neodymium-doped yttrium aluminium garnet; Nd:Y3Al5O12) is a crystal that is used as a lasing medium for solid-state lasers. The dopant, triply ionized neodymium, typically replaces yttrium in the crystal structure of the yttrium aluminium garnet (YAG), since they are of similar size. Generally the crystalline host is doped with around 1% neodymium by atomic percent.

Features:

High Gain, Low Threshold, High Efficiency;
Low Loss at 1.06 mm, High Optical Quality;
Good Mechanical and Thermal Properties;
Due to the cubic symmetry and high quality, Nd:YAG is easy to operate with TEM00 mode.

Applications:

Nd:YAG can produce blue laser with the frequency-doubling of 946nm;
Nd:YAG can be operated in a very high power laser up to kw level at 1064nm;
Nd:YAG can be Q-switched with Cr4+YAG directly;
Nd:YAG can be used for high power green laser for SHG@1064nm.

Optical Properties:

Stimulated Emission Cross Section	2.8x10-19 cm²
Relaxation Time of Terminal Lasing Level	30 ns
Radiative Lifetime	550 us
Spontaneous Fluorescence Lifetime	230 us
Linewidth	0.6 nm
Pump Wavelength	807.5nm
Absorption Bandwidth	1nm
Polarized Emission	Unpolarized
Thermal Birefringence	High
Loss Coefficient	0.003 cm^-1@ 1064nm

Specifications:

Doping (atm%)	0.2%~ 2.5%
Orientation	<111> crystalline direction
Wavefront distortion	λ/8 per inch @ 633 nm
Extinction Ratio	>28dB
Dimension Tolerances	Dia.: +/-0.025 mm , Length: +/-0.5 mm
Surface quality	10/5 Scratch / Digper MIL-O-1380A
Parallelism	< 10 arc seconds
Perpendicularity	< 5 arc minutes
Clear Aperture	>90%
Flatness	<λ/10 @ 633 nm
chamfer	<0.1 mm @ 45deg
Barrel Finish	50-80 micro-inch (RMS) ,
Anti-Reflection Coating	R < 0.20% @ 1064 nm per surface. Damage threshold over 1GW/cm2@ 1064nm, 10 ns and 10 HZ
High-Reflection Coating	Standard HR coating with R>99.8% @ 1064nm and R<5% @ 808nm

Note: Other specifications of Nd:YAG crystals and coatings are also available upon request.

Nd:YAG

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