Nd:YAG

Nd:YAG

 Although Nd:YAG was invented in the Sixties last century, it has been and is still the most commonly used solid-state crystal material. Nd:YAG crystals are wildly used in all types of solid-state lasers systems-frequency-doubled continuous wave, high-energy Q-switched, and so forth.

Its good fluorescent lifetime thermal conductivity and physical strengths makes it suitable for high power lamp pumped laser.

1)

Nd Dopant Concentration:

0.5-1.2 atm%tolerance within 10% of concentration

2)

Diameter:

3 ~ 14mm

3)

Length:

1~ 160mm

 

Typical Specification and Tolerance:

1)

Orientation:

<111> crystalline direction (+/-0.5℃)

2)

Wavefront Distortion:

<l/10 at 632.8nm for 3 ~ 7mm
<l/8 per inch at 632.8nm for >=7mm

3)

Surface Quality:

better than 20/10 Scratch/Dig per MIL-O-1380A

4)

Parallelism:

< 10 arc seconds

5)

Perpendicularity:

< 5 arc minutes

6)

Surface Flatness:

<l/10 at 632.8nm

7)

Clear Aperture:

Central 90%

8)

Chamfer:

0.15x45o

9)

Damage Threshold:

> 15J/cm2(uncoated )
> 700 MW/cm2(coated)

10)

Coatings:

a)AR@1064nm, R<0.1%; (see coating 9-1)
b)AR@1064nm, R< 0.1%;HT@808nm, T>95%;(see coating 6-2)
c)HR@1064nm, R>99.8%; HT@808nm, T>95%;(see coating 9-2)
d)HR@1064nm, R>99.8%; HT@808nm, T>95%; HR@532nm, R>99%;(see coating 9-3)
 

 

 picture

 Notes:

 To inquiry or order a finished Nd:YAG laser rod, please specify the specification listed above, for common application, we only need to know the main specification: Nd-dopant concentration, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.

Physical and Optical Properties

Chemical Formula Nd:Y3A15O12
Crystal Structure Cubic
Lattice Constants 12.01Ä
Concentration ~ 1.2 x 1020 cm-3
Melting Point 1970 °C
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 °C
Thermal Conductivity 14 W/m /K @20 °C, 10.5 W /m /K @100 °C.

 

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
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