Tm:YAP
Tm:YAP crystal is one of the most important crystals for LD pumping to emit 2um band laser, with excellent physical and chemical properties . The anisotropy in the structure of the Tm:YAP material makes the emission section also anisotropic, and the Tm:YAP crystals with different orientations have different laser functions, output wavelengths and operating forms . Compared with the physical and chemical properties of Tm:YAG, the 795nm pump absorption band of Tm:YAP crystal matches the emission wavelength of commonly used high-power AlGaAs diodes better, and its pump absorption bandwidth is 4nm wider than that of Tm:YAG crystal, with higher efficiency , and directly output linearly polarized light. Tm:YAP crystals are widely used in medical, communication and other fields.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Lattice constant | a = 0.518 nm , b = 0.532 nm c = 0.736 nm |
| Melting point | 1870 °C |
| Density | 5.35 g/ cm3 |
| Moh's hardness | 8.5 |
| Specific heat capacity | 400 J/(kg ·K) |
| Thermal conductivity | 11W/(m·K) |
| Coefficient of thermal expansion | a-axis: 9.5x 10 -6 /K ; b-axis: 4.2 x 10 -6 /K ; c-axis: 10.8x 10 -6 /K |
| Refractive index | na=1.91 , nb=1.92 , nc=1.94 |
| Thermo-optic coefficient | dn a /dT=9.7 x 10 -6 /K ; dn c /dT=14.5 x 10 -6 /K |
| Doping concentration | Tm: 0.2~15at% |
| Orientation | [010] or [100] ±5° |
| Crystal size | Diameter 2~10mm, length 2~100mm , can be customized |
| Wavefront distortion [@632.8nm] | ≤0.125l/25mm @632.8nm |
| Extinction Ratio | ≥25dB |
| Dimensional tolerance | Diameter: +0.00/-0.04, length ±0.5mm |
| Cylindrical processing | Grinding or Polishing |
| Parallelism of end faces | ≤10" |
| Perpendicularity between end face and rod axis | ≤5′ |
| Flatness of end face [@632.8nm] | l/8 @632.8nm |
| Surface finish | 10/5 (MIL-O-13830A) |
| Chamfer | 0.15±0.05mm |
| AR Coating Reflectance | ≤0.25% |
Key Features
Datasheet
Supplier Information
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Tm：YAP Laser Crystals Yagcrystal
Doping concentration: Tm:1.0 ~ 4.0 at%. Wavefront distortion: ≤0.125λ/25mm@632.8nm. Crystal rod dimensions: available to customer requirements. Dimensional tolerance: diameter:+0.00/-0.05mm, length:± 0.5mm. Barrel processing: fine grinding or polishing. End-face parallelism:≤10". End-face perpendicularity to rod axis:≤5′. End-face flatness:≤λ/8@632.8nm. Surface finish:gradeⅠ. Edge bevel:0.2±0.05mm. Tm:YAP is an important diode-pumped crystal for2μm laser emission. Although its physical and chemical properties resemble Tm:YAG, its795nm pump absorption band better matches commonly used high-power AlGaAs diodes, and its pump absorption bandwidth is4nm wider than Tm:YAG, giving higher efficiency and direct linearly polarized output. Tm:YAP has important medical-laser and military applications. Crystal structure: orthorhombic. Lattice constants:a = 0.5138 nm, b = 0.5274 nm/c = 0.7308 nm (space group Pbnm). Melting point:1870 °C. Density:5.35 g/cm³. Mohs hardness:8.5. Specific heat:400 J/(kg ·K). Thermal conductivity:11W/(m·K). Refractive indices:n_ₐ=1.91, n__b=1.92, n__c=1.94.
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