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Yb:YAG

Laser Crystals ---------Yb:YAG

Ytterbium doped Yttrium Aluminum Garnet (Yb:Y3Al5O12 or Yb:YAG) is one of the most promising laser-active materials and more suitable for diode-pumping than the traditional Nd-doped crystals. It can be pumped at 0.94 μm and generates 1.03 μm laser output. Compared with the commonly used Nd:YAG crystal, Yb:YAG crystal has a larger absorption bandwidth in order to reduce thermal management requirements for diode lasers, a longer upper-state lifetime, three to four times lower thermal loading per unit pump power.

Physical and Chemical Properties

　

　Chemical formula

　Yb³⁺:Y₃Al₅O₁₂

　Crystal structure

　cubic

　Lattice Parameters

　12.01A

　Melting Point

　1970 ℃

　Density, g/cm³

4.56

　Mohs hardness

8.5

　Thermal expansion coefficient

　7.8 x 10^-6 x °K^-1 , <111>, 0 - 250 °C

　7.7×10^-6/ ℃ , <110> (0~250 ℃ )

　 8.2×10^-6/ ℃ , <100> (0~250 ℃ )

　Thermal conductivity at 25°C, W x cm^-1 x °K^-1

0.14

　Loss coefficient at 1064 nm, cm^-1

0.003

Laser Properties

　

　Laser Transition

　²F_5/2 → ²F_7/2

　Laser Wavelength

　1030nm

　Photon Energy

　1.93×10-19J(@1030nm)

　Emission Linewidth

　9nm

　Emission Cross Section

　2.0×10-20cm²

　Fluorescence Lifetime

　1.2 ms

Spectral Properties

　

　Diode Pump Band

　940nm or 970nm

　Thermal Optical Coefficient

　7.3×10^-6/ ℃

　Index of Refraction

1.82

Standard specifications

Dopant concentration, at.%

　0.5-30%

　orientation:

　<111>within 5°

　Flatness

　< λ/10

　Parallelism

　≤ 10"

　Perpendicularity

　≤ 5 ′

　Surface Quality

　10-5(MIL-O-13830A)

　AR Coating Reflectivity

　≤ 0.25% (@1030nm)

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