Description of Holmium-Doped Yttrium Aluminum Garnet Crystal
The radiation wavelength of Ho3+ ions is near 2100nm, which is located in the human eye safe band has high transmittance in the atmosphere, and has important application prospects in the fields of remote sensing detection, laser ranging, laser radar, etc. Meanwhile, 2100nm is located in the absorption peak of the water molecule, which is highly absorbed by human tissues. When Ho laser is used for medical surgery, its penetration depth in the human body is only a few tens of micrometers, and it has little heat damage to the surrounding tissues of the human body. Therefore, it is widely used in medical surgery and treatment. Ho laser can also be used as a pump source, through the non-linear effect of the crystal (such as ZGP crystal), an infrared laser with a wavelength of 3 ~ 5 mm can be realized.
Specifications of Holmium-Doped Yttrium Aluminum Garnet Crystal
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Material specifications
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Concentration Tolerance (atm%)
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0.2% ~3%(as per customers request)
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Orientation
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<111>crystalline direction
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Parallelism
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<10”
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Perpendicularity
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<5”
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Surface Quality
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10/5 Scratch/dig per MIL-O-1380A
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Wavefront Distortion
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λ/8per inch @633nm
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Surface Flatness
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λ/10@ 633 nm
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Clear Aperture
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>90
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Thickness/Diameter Tolerance
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Rods with diameter:(+0、-0.05)mm,( ±0.5) mm
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Optical and spectral properties
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Laser Transition
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5I7→5I8
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Laser Wavelength
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2.05μm
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Effective Stimulated Absorption Cross-Section
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1.09×10-20cm2
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Effective Stimulated Emission Cross-Section
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1.14×10-20cm2
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Pump Wavelength
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1908 nm
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Laser Wavelength
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2090 nm
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Fluorescence Lifetime
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7 ms
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Quantum Efficiency
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1
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Refractive Index @1.030 μm
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1.82
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Upper Conversion Loss Factor
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1.8, 2.6, 5.3×10-18cm3/s
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Applications of Holmium-Doped Yttrium Aluminum Garnet Crystal
- Medical
- Optical communication
- Remote sensing and radar
- Laser Chemistry
- Laser spectrum
- Material processing,
- Laser ranging
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