Neodymium Doped Yttrium AIuminum Garnet (Nd:YAG) Crystal

Nd:YAG crystal is the most widely used solid-state laser material today. Now,we are able to stably supply quantity of Nd:YAG rods with high optical homogeneity, consistent performance, high processing accuracy and on time delivery. Different specifications and size from f 3 x 0.5 mm to f 12 x 150 mm are available in CASIX.

1. Basic Properties (1.0 atm% Nd doped)

Chemical Formula

Nd:Y3Al5O12

Crystal Structure

Cubic

Lattice Constants

12.01 Å

Concentration

~ 1.2 x 1020 cm-3

Melting Point

1970 oC

Density

4.56 g/cm3

Mohs Hardness

8.5

Refractive Index

1.82

Thermal Expansion Coefficient

7.8 x 10-6 /K [111], 0 - 250 oC

Thermal Conductivity

14 W/m /K @20 oC, 10.5 W /m /K @100 oC.

Lasing Wavelength

1064 nm

Stimulated Emission Cross Section

2.8x10-19 cm-2

Relaxation Time of Terminal Lasing Level

30 ns

Radiative Lifetime

550 ms

Spontaneous Fluorescence

230 ms

Loss Coefficient

0.003 cm-1 @ 1064 nm

Effective Emission Cross Section

2.8 x 10-19 cm2

Pump Wavelength

807.5 nm

Absorption band at pump wavelength

1 nm

Linewidth

0.6 nm

Polarized Emission

Unpolarized

Thermal Birefringence

High

2. Standard Products specification

Dopant Concentration (atomic %): 0.9%~ 1.1%

Orientation: <111> crystalline direction (±5“)

Wavefront distortion:l/8 per inch, measured by a double-pass interferometer @ 633 nm

Extinction Ratio:
Rods with diameter from 3 mm to 6.35 mm and with length to 100 mm:>30dB
Rods with diameter from 7 mm to 10 mm and with length to 100 mm:>28dB

Dimension Tolerances
Rods with diameter: ±0.025 mm (±0.001"), Length: ±0.5 mm (±0.02")
Barrel Finish:50 80 micro-inch (RMS) ,  grooved rod barrel are also available

Ends Finish:
Surface Figure: <l/10 @ 633 nm
Parallelism: < 10 arc seconds
Surface quality:< 5 ar c minutes
Clear Aperture: > 10/5 Scratch / Digper MIL-O-1380A
chamfer:<0.1 mm @ 45°
clear Aperture:extend over the entire faces to the chamfered edges

Anti-Reflection Coating:
Single layer MgF2 coating with high damage threshold for high power laser operation. Reflectivity R < 0.25% @ 1064 nm per surface. Damage threshold over 750 MW/cm2@ 1064nm, 10 ns and 10 HZ.

High-Reflection Coating:
Standard HR coating with R>99.8% @ 1064nm and R<5% @ 808nm can be performed in CASIX. Other HR coatings, such as HR @ 1064/532 nm, HR @ 946nm, HR 1319 nm and other wavelengths are also available.

Standard products in-stock:
The standard Nd:YAG laser rod with dimension of f3x5 mm and f4x50 mm with AR or HR- coating for Diode Pumped Solid State Lasers (DPSS) are ready for immediate delivery. For more information about standard Nd:YAG rods, please refer to page 62 of Diode Pumped Laser Optics Kits.

Higher grade or specific Nd:YAG rods or slabs are also available upon request.