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Ho:Cr:Tm: YAG Crystal

Ho:Cr:Tm:YAG CrystalHo:Cr:Tm:YAG is a high efficient laser material which lases at 2.1 µm. It has wide applications in surgery, dentistry, atmospheric testing, etc. High spectral overlap of pump radiation (lamp or diode) with the Cr3+ and Tm3+ absorption bands, and a highly efficient conversion from the absorption bands into the 5I7 -> 5I8 Ho3+ emission band, enables 2 micron laser architectures with high quantum efficiency.

 

Ho:Cr:Tm:YAG Crystal Features:

- High slope efficiency

- Pumped by flash lamp or diode

- Operates well at room temperature

- Operates in a relatively eye-safe wavelength range    

 

Ho:Cr:Tm:YAG Crystal Physical Properties:

 

 Crystal Structure

 Cubic

 Lattice Parameters

 12.01 Å

 Melting Point

 1970 °C

 Moh Hardness

 8.5

 Density

 4.56±0.04g/cm3

 Specific Heat (0-20)

 0.59J/g.cm 3

 Modulus of Elasticity

 310GPa

 Young's Modulus

 3.17 x 104 Kg/mm2

 Poisson Ratio

 0.3(est.)

 Tensile Strength

 0.13~0.26GPa

 Thermal Expansion Coefficient

 [100]Direction:8.2x10-6 / °C (0~250 °C )

 [110]Direction:7.7x10-6 / °C (0~250 °C )

 [111]Direction:7.8x10-6 / °C (0~250 °C )

 Thermal Conductivity

 14W/m/K(@20 °C )

 10.5W/m/K(@100 °C )

 Thermal Optical Coefficient (dn/dT)

 7.3×10-6 / °C

 Thermal Shock Resistance

 790W/m

 

Ho:Cr:Tm:YAG Crystal Optical Properties:

 

 Laser Transition

 5I7 -> 5I8

 Laser Wavelength

 2097nm

 Photon Energy

 9.55×10-20J

 Emission Cross Section

 7×10-21 cm2

 Fluorescence Lifetime

 8.5 ms

 Absorption Linewidth

 4 nm

 Diode Pump Band

 781 nm

 Major Pump Bands

 400~800 nm

 Index of Refraction

 1.80 @2080nm

 Sellemeier equation (λ in um)

 n2=2.08745+1.2081λ2/(λ2-0.02119)+17.2049λ2/(λ2-1404.45)

 

Ho:Cr:Tm:YAG Standard Product Specifications:

 

 Dopant concentration

 Ho: ~ 0.35 at%, Tm: ~ 5.8 at%, Cr:~1.5at%

 Orientation

 <111> or <100> crystalline within 5°

 Wavefront distortion

 λ /8 @ 633 nm

 Extinction Ratio

 >25dB

 Rod Sizes

 Diameter:36mm, Length:50120 mm

 Dimension Tolerances

 Diameter: ±0.025 mm, Length: ±0.5 mm

 Surface quality

 10/5 Scratch / Dig per MIL-O-1380A

 Parallelism

 < 10 arc seconds

 Perpendicularity

 < 5 arc minutes

 Flatness

 < λ /10 @ 633 nm

 Chamfer

 <0.1 mm @ 45deg.

 Barrel Finish

 Ground Finish: 400# Grit

 AR Coating Reflectivity

 < 0.25%