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Yb:YAG

Ytterbium Doped Yttrium Aluminum Garnet(Yb: YAG)crystal is one of the most promising laser-active materials and more suitable for diode-pumping then thetraditional Nd-doped systems.It can bepumped at 0.94¦Ìm laser output. Compared withthe commonly used Nd: YAG crystal,Yb:YAG crystalhas a much larger absorption bandwidth to reduces thermal management requirements for diode lasers,a longer upper-state lifetime, three to four times lowerthermal loading per unit pump power.Yb:YAG crystal is expected to replace Nd: YAG crystal for high power diode-pumped lasers and other potential applications. 


The advantages of Yb:YAG crystals including:

Very low fractional heating, less than < 11%;
Very high slope efficiency;
Broad absorption bands, about 18nm @ 940nm;
No excited-state absorption or up-conversion
Conveniently pumped by reliable InGaAs diodes at 940nm (or 970nm);
High thermal conductivity and strength.


1.Main Specifications

 Dopant concentration:

 0.2%~25% at% (Tolerance 10% of concentration)

 Orientation:

 [100] or[111]within 5¡ã

 Wavefront Distortion:

 ¡ÜLambda/8 @632.8nm

 Extinction Ratio:

 ¡Ý28 dB

 Rod Sizes:

  Upon request of customer

 Dimensional Tolerances:

 Diameter:+0.00/-0.05mm,
 Length: ¡À 0.5mm

 Barrel Finish:

 Ground Finish: 400# Grit

 Parallelism:

 ¡Ü15" Arc Second

 Perpendicularity:

 ¡Ü5¡ä Arc Minute

 Flatness:

 ¡ÜLambda/10 @632.8nm

 Surface Quality:

 10/5 Scratch/Dig. (per MIL-O-13830A)

 Chamfer:

 <0.1 mm @ 45¡ã

 Coating:

 a) AR @ 940nm or HR @940nm
 b) AR @ 1053nm or AR @1030nm or HR @1053nm

2. Optical and Spectral Properties

 Laser Transition

 2F5/2  2F7/2

 Laser Wavelength

 1030nm

 Photon Energy

 1.93¡Á10-19J(@1030nm)

 Emission Linewidth

 9nm

 Emission Cross Section

 2.0¡Á10-20cm2

 Fluorescence Lifetime 

 1.2ms

 Diode Pump Band
 940nm or 970nm
 Pump Absorption Band Width
 8 nm

 Index of Refraction

 1.8197@1064nm

 
3.Physical and Chemical Properties

 Crystal Structure

 Cubic

 Lattice Parameters

 12.01Å

 Melting Point

 1970¡æ

 Moh Hardness

 8.5

 Density

 4.56¡À0.04g/cm3

 Specific Heat (0-20)

 0.59J/g.cm3

 Modulus of Elasticity

 310GPa

 Young's Modulus

 3.17¡Á104Kg/mm2

 Poisson Ratio

 0.3(est.)

 Tensile Strength

 0.13~0.26GPa

 Thermal Expansion Coefficient

 [100]Direction:8.2¡Á10-6/¡æ(0~250¡æ)

 [110]Direction:7.7¡Á10-6/¡æ(0~250¡æ)

 [111]Direction:7.8¡Á10-6/¡æ(0~250¡æ)

 Thermal Conductivity

 14W/m/K(@20¡æ)

 10.5W/m/K(@100¡æ)

 Thermal Optical Coefficient (dn/dT)

 7.3¡Á10-6/¡æ

 Thermal Shock Resistance

 790W/m

 Solubility

 Water:Insoluble;
 Common Acids:Slightly