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Design and performance of a composite Tm:YAG laser pumped by VBG-stabilized narrow-band laser diode 下载免费PDF全文
A 2-μm composite Tm:YAG laser pumped with a narrow-band laser diode was presented. The temperature distribution and thermal lens in the Tm:YAG were numerically simulated by a finite element method and the results were used to design the special cavity, in order to achieve a high efficiency and stable output. With a 25-W incident pump power, we obtained a maximum output power of 11 W at 2018.5 nm, corresponding to a slope efficiency of 51.3% and an optical-to-optical efficiency of 44.5%, respectively. The beam quality was measured to be M_x~2= 1.8 and M_y~2= 1.6. 相似文献
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采用杆系-层模型,将计算结构静力可靠度的改进的JC法、常规有限元法及时程分析法相结合,建立了抗震结构弹塑性变形能力可靠度时域随机算法。本文方法可充分考虑结构参数及地震作用的随机性以及地震作用与静载的共同影响;可对结构侧向变形能力作地震全过程弹塑性时变可靠度分析。采用本文方法及MC模拟算法分析了一榀三层铪框架侧向变形能力弹塑性时变可靠度,结果表明了本文方法的合理性与有效性。 相似文献
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Development of an injection-seeded single-frequency laser by using the phase modulated technique 下载免费PDF全文
An injection-seeded single-frequency Q-switched Nd:YAG laser is accomplished by using a phase modulated rampfire technique. A RbTiOPO_4(RTP) electro-optic crystal is selected for effective optical path length modulation of the slave self-filtering unstable resonator. This single-frequency laser is capable of producing 50 m J pulse energy at 1 Hz repetition rate with a pulse width of 16 ns. The standard deviation of laser pulse intensity for consecutive 100 shots from the mean pulse intensity is less than 1.05%. A spectral linewidth of less than 0.5 pm with a frequency jitter of about 14 fm over30 min is obtained. 相似文献
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