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.

Capabilities

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:	0.15x45^o
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)

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 10²⁰cm^-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

Nd:YVO4 Ti:Sapphire

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