Nd:YAG Crystals

Nd:YAG Crystals
Nd:YAG Crystals Nd:YAG Crystals

Nd:YAG (Neodymium Doped Yttrium Aluminum Garnet, Nd:Y3Al5O12) has been and continues to be the most mature and most widely used crystals for lasers, no matter solid state or lamp pumped, CW or pulsed. It possesses a combination of properties uniquely favorable for laser operations. Newlight Photonics has developed the state-of-the-art crystal growing technology to enable the availability of large and high quality crystals.

Nd:YAG crystals with diffusion bonded undoped YAG endcaps are also available from Newlight Photonics. Please visit here

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Newlight's Nd:YAG crystal features,

High gain, low threshold, high efficiency
Low loss at 1064 nm, high optical quality
Excellent mechanical and thermal properties

Basic Properties:

Crystal Structure Cubic
Lattice Constant 12.01 Å
Melting Point 1970 oC
Density 4.56 g/cm3
Refractive Index 1.82 @ 1064 nm
Thermal Expansion Coefficient 7.8x10-6 /K along <111>
8.2x10-6 /K along <100>
Thermal Conductivity 14 W/m/K, 20 ºC
10.5 W/m/K, 100 ºC
Mohs Hardness 8.5

Optical Properties:

Stimulated Emission Cross Section 2.8x10-19 cm2
Spontaneous Fluorescence Lifetime 230 µs
Linewidth 0.6 nm@1064 nm
Pump Wavelength ( With Laser Diodes) 807.5 nm
Absorption Bandwidth 1 nm
Polarized Emission Unpolarized
Thermo-Optic Coefficient (dn/dT) 7.3x10-6 /K
Thermal Birefringence High
Loss Coefficient  ~ 0.002 cm-1 @ 1064 nm

Application examples:

Very high power lasers up to KW @ 1064 nm
Blue lasers with the frequency doubling of 946 nm 
 Compact passively Q-switched Nd:YAG lasers with Cr4+:YAG 
High power green laser from SHG @ 1064 nm


Specifications of Nd:YAG products:

Doping: 0.1% ~ 1.5% (Atomic Pencentage, atm%)
Orientation: axis along <111> or <100> direction
Wavefront Distortion: <  λ/4 per inch @ 632.8 nm
Extinction Ratio: > 30 dB
Dimension Tolerances Diameter +0.0/-0.05 mm , Length ±0.5 mm
Surface Quality: 10/5 Scratch/Dig as per MIL-O-1380A
Parallelism: < 10 arc seconds
Perpendicularity: < 3 arc minutes
Clear Aperture: > 90%
Surface Flatness: < λ/10 @ 632.8 nm
Chamfer: < 0.1 mm @ 45o


Standard Anti-Reflection (AR) Coating:

R < 0.20% @ 1064 nm per surface with the damage threshold > 1GW/cm2 @ 1064 nm,
10 ns and 10 Hz. 

Typical AR coating curve @ 1064 nm:

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