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Renewable Design for Kd P Eo Q-Switch - Ho: YAG Crystals – Dien Detail:
Ho:YAG Ho3+ ions doped into insulating laser crystals have exhibited 14 inter-manifold laser channels, operating in temporal modes from CW to mode-locked . Ho:YAG is commonly used as an efficient means to generate 2.1-μm laser emission from the 5I7- 5I8 transition, for applications such as laser remote sensing, medical surgery, and pumping Mid-IR OPO’s to achieve 3-5micron emission. Direct diode pumped systems,and Tm: Fiber Laser pumped system have demonstrated hi slope efficiencies, some approaching the theoretical limit.
Basic Properties
| Ho3+ concentration range |
0.005 – 100 atomic % |
| Emission Wavelength |
2.01 um |
| Laser Transition |
5I7 → 5I8 |
| Flouresence Lifetime |
8.5 ms |
| Pump Wavelength |
1.9 um |
| Coefficient of Thermal Expansion |
6.14 x 10-6 K-1 |
| Thermal Diffusivity |
0.041 cm2 s-2 |
| Thermal Conductivity |
11.2 W m-1 K-1 |
| Specific Heat (Cp) |
0.59 J g-1 K-1 |
| Thermal Shock Resistant |
800 W m-1 |
| Refractive Index @ 632.8 nm |
1.83 |
| Melting Point |
1965℃ |
| Density |
4.56 g cm-3 |
| MOHS Hardness |
8.25 |
| Young’s Modulus |
335 Gpa |
| Crystal Structure |
Cubic |
| Standard Orientation |
<111> |
| Y3+ Site Symmetry |
D2 |
| Lattice Constant |
a=12.013 Å |
Technical Parameters
| Wavefront distortion |
L/8per inch @633nm |
| Extinction ratio |
>28dB |
| Wavefront distortion |
L/8per inch @633nm |
| Extinction ratio |
>28dB |
| Tolerance:Rods with diameter |
(+0、-0.05)mm,( ±0.5) mm |
| Surface quality |
10/5 Scratch/dig per MIL-O-1380A |
| Parallelism |
<10arc seconds |
| Perpendicularity |
<5arc minutes |
| Aperture |
>90% |
| Flatness |
λ/10@ 633 nm |
| Tolerance:Rods with diameter |
(+0、-0.05)mm,( ±0.5) mm |
| Surface quality |
10/5 Scratch/dig per MIL-O-1380A |
| Parallelism |
<10arc seconds |
| Perpendicularity |
<5arc minutes |
| Aperture |
>90% |
| Flatness |
λ/10@ 633 nm |
Absorption coefficient

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