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Compared with the common Nd:YAG laser rods, the grooved Nd:YAG laser rods has the following advantages: Thermal effect has been reduced The quality of the beam has been improved The efficiency of Grooved Rod has been improved by 10%-20%
Properties
Chemical Formula
Nd:Y3Al5O12
Crystal Structure
Cubic
Lattice Constants
12.01
Concentration
~ 1.2 x 1020 cm-3
Melting Point
1970℃
Density
4.56 g/cm3
Mohs Hardness
8.5
Refractive Index
1.82
Thermal Conductivity
14 W/m /K @20℃, 10.5 W /m /K @100℃
Thermal Expansion Coefficient
7.8 x 10-6/K [111], 0 - 250℃
Lasing Wavelengths
1064 nm
Photon Energy
1.86x10-19J@1064nm
Stimulated Emission Cross-Section
2.8x10-19 cm2
Relaxation Time of Terminal Lasing Level
30 ns
Radiative Lifetime
550us
Spontaneous Fluorescence
230us
Loss Coefficient
0.003 cm-1@ 1064 nm
Pump Wavelength
807.5 nm
Absorption band at pump wavelength
1 nm
Linewidth
0.6nm
Polarized Emission
Unpolarized
Thermal Birefringence
High
Specifications
Nd Dopant Level
0.5-1.1 atm%
Orientation
<111> crystalline direction (±0.5deg)
Dimension Tolerances
Diameter: ±0.05mm
Length: ±0.5mm
Wavefront Distortion
λ/8@633nm
Surface Flatness
λ/10@633nm
Parallelism
<10 arc seconds
Perpendicularity
<5 arc minutes
Surface Quality
10/5 Scratch and Dig
Clear Aperture
>90%
Chamfer
<0.1mmx45°
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
AR Coating
Reflectivity R<0.25%@1064 nm per surface Damage threshold over 750MW/cm2@1064nm, 10 ns and 10 Hz Other coating is per your request
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