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Nd:YAG - Neodymium Doped Yttrium Aluminum Garnet

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Nd:YAG - Neodymium Doped Yttrium Aluminum Garnet
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  • Nd:YAG - Neodymium Doped Yttrium Aluminum Garnet

  • Nd:YAG, the earlist and most famous laser host crystal with advantageous properties, is ubiquitously used for near IR solid lasers and their frequency-doubler, tripler, and higher order multiplier.
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Introduction

Neodymium Doped Yttrium Aluminum Garnet (Nd:YAG) is the earliest and most famous laser host crystal. Since it combines great advantages in many basic properties, Nd:YAG is the ubiquitous presence for near-infrared solid-state lasers and their frequency-doubler, tripler, and higher order multiplier.

 

CASTECH's Nd:YAG is featured by

  • High gain
  • Low threshold
  • High optical quality
  • High efficiency
  • Low loss at 1064nm
  • Good thermal conductivity and thermal shock characteristics
  • Mechanical strength
  • Material characteristics that allow for various modes of operation (CW, pulsed, Q-switched, mode locked)

 

Table 1. Basic Properties

Crystal Structure

Cubic

Lattice Parameter

12.01 Å

Density

4.5 g/cm3

Melting Point

1970℃

Reflective Index

1.82

Mohs Hardness

8.5 Mohs

Thermal Expansion Coefficient

7.8 × 10-6 /K <111>, 0 - 250℃

Thermal Conductivity 

14 W/cm/K, 20℃

10.5 W/cm/K, 100℃

Stimulated Emission Cross-section

2.8 × 10-19 cm-2

Relaxation Time of Terminal Lasing Level

30 ns

Fluorescent Lifetime

550 µs

Spontaneous Fluorescence

230 µs

Linewidth

0.6 nm

Loss Coefficient

0.003 cm-1 @1064 nm

 

  Specifications of Nd:YAG crystal from CASTECH

Table 2. Specifications

Dopant Concentration

Nd: 0.3~2.0 (± 0.1) atm%

Dimension

size up to dia. 15 × 180 mm and maximum diameter of dia. 40 mm × 2 mm

Dimensional Tolerances

Diameter: ± 0.1mm 

Length: ± 0.5 mm

Surface Quality (Scratch/Dig)

10/5 to MIL-PRF-13830B

Wavefront Distortion

λ/8 @633 nm

Flatness

 λ/8 @633 nm

Parallelism

20 arc sec

Perpendicularity

≦ 15 arc min

Chamfer

≦ 0.2 mm×45°

HR Coating

R > 99.8% @1064 nm, R < 5% @808 nm

Other HR Coatings, such as HR-1064/532 nm, HR-946 nm, HR-1319 nm and other wavelengths are available.

Damage Threshold

>500 MW/cm2  @1064 nm, 10 ns, 10 Hz (AR-coated) 

 

Table 3. Optical Parameter of Nd:YAG crystal

Diameter (mm)

Standard grade

Excellent grade

Super-excellent grade

Φ3-6.35

≦ 0.5 fringes/inch

≦ 0.25 fringes/inch

≦ 0.1 fringes/inch

≧ 25 dB

≧ 28 dB

≧ 30 dB

Φ7-10

≦ 0.7 fringes/inch

≦ 0.4 fringes/inch

≦ 0.16 fringes/inch

≧ 22 dB

≧ 25 dB

≧ 28 dB

Φ11-13

≦ 1 fringes/inch

≦ 0.6 fringes/inch

≦ 0.2 fringes/inch

≧ 20 dB

≧ 23 dB

≧ 26 dB

Φ14-16

≦ 1.2 fringes/inch

≦ 0.8 fringes/inch

≦ 0.25 fringes/inch

≧ 18 dB

≧ 20 dB

≧ 23 dB

 

Higher grade or specific Nd:YAG rods or slabs, and Nd:YAG rods for 946 nm and 1319 nm lasers can be provided. Er:YAG, Yb:YAG and other ion doped YAG crystals are also available upon request.

  • Laser Crystals_Neodymium Doped Yttrium Aluminum Garnet(Nd_YAG) Crystal.pdf

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