Nd:YAG
 

 

 


Nd:YAG(Neodimium Doped Yttrium Aluminum Garnet) has been widely used laser crystal for solid-state laser. Its laser parameters are a good compromise between the strengths and weaknesses of its competition. Nd:YAG crystals are used in all types of solid-state lasers systems-frequency-doubled continuous wave, high-energy Q-switched , etc.. Compared with others laser crystals, its fluorescence lifetime is twice more than Nd:YVO4, and thermal conductivity is also better.

    1. High Gain, Low Threshold, High Efficiency,

    2. Low Loss at 1.06 mm, High Optical Quality,

    3. Good Mechanical and Thermal Properties

    4. Due to the cubic symmetry and high quality, Nd:YAG is easy to operate with TEM00 mode

 

 

 

 

 

 

Basic Properties

 

 

Chemical Formula:

Y3Al5O12

Crystal structure:

Cubic

Lattice constant:

12.01Å

Melting point:

1970 oC

Density:

4.5g/cm3

Reflective Index:

1.82

Thermal Expansion Coefficient:

7.8x10-6 /K <111>

Thermal Conductivity (W/m/K):

14W/m/K, 20º C
10.5W/m/K, 100º C

Mohs hardness:

8.5

Stimulated Emission Cross Section:

2.8x10-19 cm-2

Relaxation Time of Terminal Lasing Level:

30 ns

Radiative Lifetime:

550 m s

Spontaneous Fluorescence:

230 m s

Line

0.6 nm

Pump Wavelength

807.5nm

Polarized Emission

Unpolarized

Thermal Birefringence

High

Absorption band at pump wavelength

1nm

Loss Coefficient:

0.003 cm-1 @ 1064nm

 

 

 

 

 

Applications

 

 

   1. Nd:YAG can produce blue laser with the frequency-doubling of 946nm

   2. Nd:YAG can be operated in a very high power laser up to kw level at 1064nm

   3. Nd:YAG can be Q-switched with Cr4+YAG directly

   4. Nd:YAG can be used for high power green laser for SHG@1064nm

 

 

 

 

Specifications

 

 

   Nd dopant:                   0.8%~1.3% atm%

   Extinction Ratio:          >28dB

   Dimension Tolerance:   +/-0.05mm

   Length Tolerance:        +/-0.5mm

   Orientation:                 <111> crystalline direction

   Surface quality:           10/5 scratch/dig per MIL-O-13830A

   Parallelism:                 <10 arc sec.

   Perpendicularity:          <5 arc min.

   Flatness:                     <1/10 lambda at 632.8nm

   Wavefront Distortion:     1/8 lambda at 632.8nm

   Clear Aperture:             >90%

   Chamfer:                      <0.1mmx45deg.

   Barrel Finish:                50-80 micro-inch(RMS)

   Coating:                      AR @1064nm, R<0.2%@,

                                           HR @1064nm, R>99.8%, HT@808nm,T>95%

   Damage threshold:       1GW/cm2 @ 1064nm, 10ns, 10HZ

 

 

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