Nd:YAG
我司的Nd:YAG 晶體產(chǎn)品，又稱摻釹釔鋁石榴石晶體，是一種綜合性能良好的用作固態(tài)激光器的激光介質(zhì)晶體。Nd:YAG晶體中的原子被閃光燈激發(fā)，晶體產(chǎn)生以特定波長（1064 nm）傳播的放大光。Nd:YAG晶體在生物物理，醫(yī)學(xué)，軍事，機(jī)械，科研和建筑等領(lǐng)域有著廣泛的應(yīng)用。該產(chǎn)品有高光學(xué)質(zhì)量、良好的機(jī)械和熱性能的特點。Nd：YAG是通過將Nd離子摻雜到YAG晶體中而獲得的成熟的激光晶體之一。Nd：YAG激光晶體的吸收帶寬為730-760nm和790-820nm，通常由閃光管或激光二極管泵浦。典型的激光發(fā)射峰值為1064nm，波長為946nm，1120nm，1320nm和1440nm激光也可以通過一些測量發(fā)射，Q開關(guān)和鎖定模式適用于獲得不同波長的激光（532nm，分別為266nm，213nm等）和脈沖寬度（10-25ns）。Nd:YAG晶體廣泛用于各類固態(tài)激光器系統(tǒng)——倍頻連續(xù)波、高能調(diào)Q等。通常，高濃度摻雜晶體應(yīng)用于脈沖激光器中，低濃度摻雜晶體通常用于連續(xù)波輸出。
特點
- 增益系數(shù)高
- 激光閾值低
- 優(yōu)異的光學(xué)，機(jī)械和物理性能
- 高斜率效率
- 寬吸收帶寬
材料規(guī)格
| 釹濃度公差（atm％） | 0.1- 2.5(+/-0.1)atm% |
| 取向 | [001] or [110] or [111] <±0.5° |
| 平行性 | 10〞 |
| 垂直性 | 5ˊ |
| 表面質(zhì)量 | 10-5(MIL-O-13830A) |
| 波前失真 | λ/4@632 nm |
| 表面平整度 | λ/8@632 nm |
| 通光孔徑 | >95 % |
| 倒角 | <0.2×45° |
| 長度公差 | +0.5/-0mm |
| 厚度/直徑公差 | ±0.05 mm |
| 最大尺寸 | dia (3~12.7)×(3~150) mm |
| 損壞閾值 | >750 MW/cm2@1064 nm 10 ns 10 Hz |
| 消光比 | >30 dB(取決于實際尺寸) |
| 精密研磨 | 400 grit |
物理和化學(xué)特性
| 晶體結(jié)構(gòu) | 立方 – la3d |
| 晶格常數(shù) | 12.01 ? |
| 密度 | 4.56 g/cm3 |
| 熔點 | 1950 °C |
| 導(dǎo)熱系數(shù)/（W·m-1·K-1 @ 25°C） | 14 |
| 比熱/（J·g-1·K-1） | 0.59 |
| 斷裂應(yīng)力 | 1.3-2.6*103?kg/cm2 |
| 熱膨脹率/（10-6·K-1 @ 25°C） | [100] 取向–8.2 |
| [110] 取向–7.7 | |
| [111] 取向–7.8 | |
| 硬度（莫氏） | 8.5 |
| 楊氏模量/ GPa | 317 |
| 剪切模量/ Gpa | 54.66 |
| 消光比 | 25 dB |
| 泊松比 | 0.25 |
光學(xué)和光譜性質(zhì)
| 激光躍遷 | 4F3/2?→>?4I11/2 |
| 光子能量 | 1.86×10-19?J |
| 激光躍遷波長，λl（nm） | 1064 |
| 泵浦躍遷波長，λp（nm） | 808 |
| 泵浦躍遷帶寬，Δλp（nm） | <4 |
| 激光躍遷帶寬，Δλl（nm） | ~0.6 |
| 泵過渡峰截面，σp（E-20 cm2） | 6.7 |
| 激光躍遷峰截面，σl（E-20 cm2） | 28 |
| 泵過渡飽和強(qiáng)度φp（kW / cm2） | 12 |
| 激光躍遷飽和強(qiáng)度φl（kW / cm2） | 2.6 |
| 激光躍遷飽和通量Γl，sat（J / cm2） | 0.6 |
| 最小泵浦強(qiáng)度Imin（kW / cm2） | ~0 |
| 上部激光管壽命，τ（毫秒） | 0.26 |
| 量子缺陷分?jǐn)?shù) | 0.24 |
| 分?jǐn)?shù)熱產(chǎn)生 | 0.37 |
| 折光率 | 1.8197?@1.064 μm |
| 熒光壽命 | 230 μs |
吸收和發(fā)射光譜
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參考文獻(xiàn)
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| [14] Meng-yao, Wu, Peng-fei, et al. Investigation of multi-segmented Nd:YAG/NdYVO4 crystals and their laser performance end-pumped by a fiber coupled diode laser[J]. Optik, 2019, 179:367-372. |
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| [27]? Ajates J G ,? Romero C ,? Castillo G R , et al. Y-junctions based on circular depressed-cladding waveguides fabricated with femtosecond pulses in Nd:YAG crystal: A route to integrate complex photonic circuits in crystals[J]. Optical Materials, 2017, 72:220. |
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