Passively Mode Locked Diode-End-Pumped Nd∶YAG Laser with In0.25 Ga0.75 As as Output Coupler

A novel InGaAs(LT-In0.25 Ga0.75 As) absorber grown by metal organic chemical vapor deposition at low temperature is presented.Using it as well as an output coupler,passive mode locking,which produces pulses as short as several hundred picoseconds for diode-end-pumped Nd∶YAG laser at 1.06μm,is realized.The pulse frequency is 150MHz.

表面态型半导体可饱和吸收镜实现Yb:YAG激光器被动锁模

制作了一种新型的半导体可饱和吸收镜:表面态型半导体可饱和吸收镜.用表面态型半导体可饱和吸收镜作为被动锁模吸收体,实现了半导体端面泵浦Yb:YAG激光器被动连续锁模.在泵浦功率为10W时,获得了连续锁模脉冲序列,重复频率200MHz,锁模脉冲平均输出功率为70mW.在未加任何色散补偿的情况下,脉冲宽度为4.35ps.

表面态型半导体可饱和吸收镜实现Nd:YAG激光器被动锁模

砷化镓半导体材料与空气接触的表面存在密度很高的电子表面态,砷化镓材料内部的电子可以通过这种表面进行驰豫,驰豫时间估计在ps量级.依此原理,制作了一种新型的表面态型半导体可饱和吸收镜,用其作为被动锁模吸收体,实现了半导体端面泵浦Nd:YAG激光器被动连续锁模.在泵浦功率为4 W的情况下,获得了连续锁模脉冲序列,重复频率150 MHz,锁模脉冲平均输出功率为300 mW,脉冲宽度为10 ps.

半导体可饱和吸收镜被动锁模Nd:YAG激光器的研究

利用自行研制的半导体可饱和吸收镜(SESAM),在5 W光纤耦合半导体激光器端面抽运的Nd:YAG激光中,实现了半导体可饱和吸收镜被动锁模,获得了稳定的皮秒锁模激光输出.经自相关仪测量,其锁模激光脉冲宽度小于10 ps.实验采用直腔结构的谐振腔,该腔结构简单,易于调整,实现可饱和半导体吸收镜稳定锁模时,光-光转换效率达到19%.

Comparative study of the mode-locking of Nd:GdVO4 and Nd:YAG lasers with semiconductor saturable absorber mirrors

Stable continuous-wave passive mode-locking of diode-end-pumped Nd:GdVO4 and Nd:YAG lasers withsemiconductor saturable absorber mirrors (SESAMs) are reported. The comparative study shows that theNd:GdVO4 crystal is efficient to decrease the Q-switched mode-locking tendency, and easier to continuous-wave (CW) mode lock than Nd:YAG.

Stable mode-locking in an Yb:YAG laser with a fast SESAM

Stable mode-locking in a diode-pumped Yb:YAG laser was obtained with a very fast semiconductor saturable absorber mirror (SESAM). The pulse width was measured to be 4 ps at the central wavelength of 1047 nm. The average power was 200 mW and the repetition rate was 200 MHz.

半导体可饱和吸收镜自启动的Kerr锁模Cr~(4+)∶YAG激光器

采用传统的X型像散腔,利用一块精心设计的半导体可饱和吸收镜(SESAM)做启动元件,实现了自启动的Kerr锁模Cr4+∶YAG激光器.输出脉冲的最窄脉宽小于80 fs,脉冲重复频率为120 MHz,脉冲峰值功率可以达到100 W以上.

LD列阵泵浦的Nd:YAG和Nd:GdVO4连续激光器

介绍了一种二极管侧面泵浦激光头的新结构，用Nd:YAG晶体作为工作物质，将此结构下激光头的输入输出性能与传统结构下的输入输出性能进行了比较。此外利用这种新结构，对一种新型晶体Nd:GdVO4进行了实验，获得了连续1064nm的激光输出42.6W，最大光光效率为23.7％。

Passive Q-Switching in a Flash-Lamp Pumped Nd∶YAG Laser with Ion-Implanted GaAs Wafer

A passive Q-switched flash-lamp-pumped Nd:YAG laser with the ion-implanted semi-insulating GaAs water is reported．The wafer is implanted with 400keV As~+ ions in the concentration of 10~(16)cm~(-2). Using GaAs wafer as an absorber and an output coupler．62ns pulse duration of single pulse is obtained.

侧面抽运Nd:YAG连续激光器

介绍了一种二极管侧面春运的Nd:YAG连续激光器器，获得了37.9 W的连续1064nm的激光输出，光-光转换效率为23.7%.用光线追迹法对实验中的具体参数进行了数值模拟，指出了实验中的不足之处，对侧面抽运结构的设计作了分析的讨论.

Modulation of Photonic Bandgap and Localized States by Dielectric Constant Contrast and Filling Factor in Photonic Crystals

The band structure of 2D photonic crystals (PCs) and localized states resulting from defects are analyzed by finite-difference time-domain (FDTD) technique and Pade approximation. The effect of dielectric constant contrast and filling factor on photonic bandgap (PBG) for perfect PCs and localized states in PCs with point defects are investigated. The resonant frequencies and quality factors are calculated for PCs with different defects. The numerical results show that it is possible to modulate the location, width and number of PBGs and frequencies of the localized states only by changing the dielectric constant contrast and filling factor.

LD列阵泵浦Nd:YAG连续激光器

介绍了一种二极管侧面泵浦的Nd:YAG连续激光器，采用了简单、实用的侧面泵浦结构，获得37.9W的连续1064 nm的激光多模输出；斜效率为31.5%，光效率为23.7%。文中还对该泵浦头的热透镜效应作了测试。

两个激光二极管端面泵浦的基横模Nd:YAG激光器

用两个功率为1．5W的连续激光二极管偏振耦合端面泵浦及分别从双端同时泵浦Nd

Design of side-pumped Nd : YAG lasers

Design of the typical laser diode side-pumped Nd:YAG rod system has been discussed using the conventional ray tracing method in this paper. Firstly introduce two basic matrices, refractional and translational matrix, described the transmission of nonparaxial light ray in the medium without concerning the absorption of light. And then, using those matrices, analyze the distribution of pump light in the crystal respectively under the condition of directly pumped system and indirectly pumped system with a cylindrical quartz rod as focusing lens. From the result of simulation, we compare the advantage and disadvantage of the two pumped method, and mainly consider how to select the diameter of the focus lens and cooling tube, indicate the effect of deionized water and cooling tube have on the pump light distribution in the active material. At last, make some conclusions about the side-pumped Nd:YAG laser system.