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     Nd:YAG
Home >> Laser Crystal >> 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.

Physical and Optical Properties
Chemical Formula Nd:Y3 Al5 O12
Crystal Structure Cubic
Lattice Constants 12.01?
Concentration ~ 1.2 x 1020 cm -3
Melting Point 1970 C
Density 4.56 g/cm 3
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 cm 2
Pump Wavelength 807.5 nm
Absorption band at pump wavelength 1 nm
Linewidth 0.6 nm
Polarized Emission Unpolarized
Thermal Birefringence High
Capabilities Include:
Nd dopant concentration 0.5---1.2 atm% tolerance within 10% of concentration.
Diameter 3 ~ 14mm
Length 1 ~ 160mm
Typical Specification and Tolerance:
Orientation <111> crystalline direction (+/-0.5C)
Wavefront Distortion </10 at 632.8nm for 3 ~7mm
</8 per inch at 632.8nm for >=7mm
Surface quality better than 20/10 Scratch/Dig per MIL-O-1380A
Parallelism < 10 arc seconds
Perpendicularity < 5 arc minutes
Surface flatness < /10 at 632.8nm
Clear aperture Central 95%
Chamfer 0.15x45
Damage threshold over 15J/cm 2 (rods without coating) over 700 MW/cm 2 (coating)
Coatings AR@1064nm,R < 0.1%;
AR@1064nm,R < 0.1%; HT@808nm,T > 95%;
HR@1064nm,R < 99.8%; HT@808nm,T > 95%;
HR@1064nm,R < 99.8%;
HT@808nm,T > 95%;HR@532nm,R > 99%;

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, size, and coating. For special request, please specify specification in details for evaluation and fabrication.