Nd:YAG Laser Crystal

Neodymium Doped Yttrium Aluminum Garnet (Nd:YAG) laser crystal is the most early and mature laser material adopted by R&D, medical, industrial and military customers. It is the  ubiquitous presence for near-infrared solid-state lasers and their frequency-doubler, tripler, and higher order multiplier.

Advantages

1 ) High gain, Low threshold, High efficiency

2 ) Low loss at 1.06um, Good thermal conductivity and thermal shock characteristics

3 ) Mechanical strength, High optical quality

4 ) Material characteristics allow for various modes of operation (CW, pulsed, Q-switched, mode locked and cavity dumped.)

Specifications

Material 

Nd:YAG

Nd Dopant Level

0.1- 2.5(+/-0.1)atm%

Orientation

or

Dimension

Diameter:1-50mm, Length:0.3-220mm(upon customer’s request)

Diameter Tolerance

+0/-0.04mm

Length Tolerance

+0.5/-0mm

Wavefront Distortion

<λ/10 per [email protected]

Chamfer

<0.1mm@45°

Damage Threshold

>750MW/cm2@1064nm 10ns 10HZ

Clear Aperture

>95%

Flatness

λ/10 per [email protected]

Scratch/Dig

10-5 @MIL-0-13830A

Barrel Finish

50-80 micro-inch(RMS)

Chips

<0.1mm

Extinction Ratio

>30dB(depends on actual sizes )

Perpendicularity 

 <5 arc minutes

Parallelism

 <10 arc seconds

Anti-Reflection Coating

R<0.15%@1064nm per surface

High-Reflection Coating

 Standard HR coating with R>99.8% @1064nm and R<5%@808nm

Properties

Chemical Formula

Nd:Y3Al5O12

Crystal Structure

Cubic

Lattice Constant

12.01Å

Melting Point

1970°

Rupture Stress

1.3-2.6*103 kg/cm2

Density 

4.55g/cm3

Mohs Hardness

8.5

Thermal Expansion Coefficient

[100] Orientation–8.2×10-6/oC (0-250oC)

[110] Orientation–7.7×10-6/oC (0-250oC)

[111] Orientation–7.8×10-6/oC (0-250oC)

Laser Transition

4F3/2 –> 4I11/2

Laser Wavelength

1064nm

Photon Energy

1.86×10-19J

Emission Linewidth

4.5Å @1.064µm

Stimulated Emission Cross Section

2.7-8.8×10-19 cm2 @Nd 1at%

Fluorescence Lifetime

230µs

Refractive Index

1.8197 @1.064µm