Nd：KGW
Nd：KGW晶體是一種可以實(shí)現(xiàn)高濃度摻雜的激光晶體，因?yàn)樵摼w可以與高濃度的Nd離子混合并且具有較大的發(fā)射面積，因此其單脈沖和低重復(fù)激光性能優(yōu)于Nd：YAG 。Nd：KGW晶體的吸收帶在808 nm處，可以有效地與LD泵浦光源耦合（發(fā)射波長(zhǎng)為808 nm），從而提高其發(fā)光效率。此外，它的半高和半寬為12 nm，使其能夠適應(yīng)LD發(fā)射波長(zhǎng)隨溫度的漂移，這有利于進(jìn)行二極管泵浦KGw激光實(shí)驗(yàn)和器件研究。Nd：KGW不僅可以實(shí)現(xiàn)自由振蕩，Q開關(guān)，鎖模操作，還可以實(shí)現(xiàn)拉曼轉(zhuǎn)換。
Nd:KGW晶體是由受激拉曼散射產(chǎn)生的晶體，經(jīng)過倍頻后可以成為可見光波段的多波長(zhǎng)光源。
Nd：KGW晶體的拉曼特性取決于其高激發(fā)光束截面、低泵浦閾值、高輸出能量、高轉(zhuǎn)換效率以及兩個(gè)高拉曼增益系數(shù)（768和901 cm-1）。拉曼晶體的基頻光分別為911 nm，1067 nm和1351 nm，經(jīng)過倍頻后可產(chǎn)生0.455 um，0.533 um和0.675 um的紅，黃和藍(lán)光，可用于材料加工，光通信，遙感，醫(yī)藥，環(huán)境監(jiān)測(cè)，精密計(jì)量等領(lǐng)域。
物理性質(zhì)
| Nd濃度 | 2.2%(cw),3%(quasi-cw) |
| 熒光壽命 | 130 μs |
| 受激發(fā)射截面 | 3.7*10-19?cm2 |
| 躍遷波長(zhǎng) | 1067 nm |
| 導(dǎo)熱系數(shù) | Ka=2.6 W/Km |
| Kb=3.8 W/Km | |
| Kc=3.4 W/Km | |
| dn / dT | 0.4*10-6?K-1 |
| 折射率@ 1.06μm | np=1.978 |
| nm=2.014 | |
| ng=2.049 | |
| 熱膨脹系數(shù) | (100):4*10-6?K-1 |
| (010):3.6*10-6?K-1 | |
| (001):8.5*10-6?K-1 | |
| 密度（g * cm-3） | 7.248 |
| 比熱容Cp | 500 Jkg-1K-1 |
光譜性質(zhì)
| 激光波長(zhǎng)（nm） | 1067 |
| 發(fā)射截面（pm2）a | 32.3 |
| 增益帶寬（nm） | 2.73 |
| 熒光壽命（μs） | 130 at 3% doping |
| 導(dǎo)熱系數(shù)（Wm-1K-1） | ~3 |
吸收和發(fā)射光譜
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參考文獻(xiàn)
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