2-μm singly resonant optical parameter oscillator

We experimentally realize a singly resonant optical parameter oscillator （OPO） which operates at the degenerate point of KTiOPOa （KTP） crystal. A thin film plate polarizer （TFP） is used as the output coupler to obtain linearly polarized 2.12 μm laser. A maximum output power of 2.2 W at 2.12 μm is obtained from a near-degenerate, type-II KTP OPO by utilizing a Q-switched diode-pumped Nd：YAG laser operating at 5 kHz.     

A Continuous-Wave Diode-Side-Pumped Tm:YAG Laser with Output 51W

A compact diode-side-pumped Tm：YAG laser is presented, which can output 51 W of cw power at 2.02 μm. The Tm：YAG rod is side pumped by nine diode arrays with the central wavelength of 783nm and the with bandwidth of about 2.5 nm at 25^o C. To decrease the thermal effect on the both ends and dissipate the heat effectively, one composite Tm：YAG rod with the undoped YAG end caps and the screw threads on the side surface of the rod is used as the laser crystal. The maximum optical-to-optical conversion efficiency of the 2.02-μm laser output is 14.2%, with a slope effciency of 26.8%     

我国第1台激光分子束外延设备研制成功

我国第１台激光分子束外延设备研制成功１９９６年５月下旬，国家自然科学基金委员会信息科学部会同中国科学院王大街院士、吴全德院士等专家，对中国科学院物理研究所杨国帧研究员主持的重点项目“激光分子束外延机理与关键技术研究”进行了中期评估。激光分子束外延是在...     

观测到分子氦的负离子He_2~-

美国的Bae等人[1]最近报告他们首次观测到了受激负离子 He2,它是亚稳态的,寿命大于 100 us.是否存在这类亚稳态的自动释放电子的负离子,无论在理论上还是在实验上都是令人感兴趣的课题.在这种类型的离子中,仅He-(1s2sZp4P0)得到多数人的确认,并在实验上做过研究.至于其它亚稳态负离子,虽然个别实验有过报道,或理论上也预言过。但并没有真正为人们所证实,它们的详细性质并不清楚。而Bae等人发现的He-2负离子尚没有被任何人预言过.由于He-2离子的电子态简单,而且也意味着其它已知的亚稳态的稀有气体准分子也可能有正电子亲合势而生成亚稳…     

Reply to Comment on ＇Q-switched Tm：YAG Laser Intracavity-Pumped by a 1064 nm Lasers

The essential goal of that paper （Chin. Phys. Lett. 26（2009） 124211） was to obtain a 2μm Tm：YAG laser with short pulse output. A Q-switched technique is used to realize the short pulse output in our laser system. The idea presented by Dr. Nieolaie Pavel is right. In our work, the directly Q-switched 2μm Tm：YAG pulse laser is not realized. As a matter of fact, the Q switch is used to directly switch the 1μm Nd：YAG laser.     

1.15 kW连续波全固态Nd:YAG激光器

研制了五组双线二极管列阵侧面泵浦Nd: YAG棒的高效率、高功率激光头。将一块90° 石英旋光片插入两个这样的激光头中间并置入热近非稳对称平平腔，产生了1157 W高光束质量（M2 ~ 39）1064 nm连续波输出，据我们所知，这是侧面泵浦双棒Nd: YAG激光器产生的最高功率。     

Reducing Thermal Effect in End-Diode-Pumped Laser Crystal by Using a Novel Resonator

We report a new way, i.e. double-end-pumping, to extend the stability range of a laser resonator, in advantage of making the thermal loading be effectively divided between the ends of the laser crystal to reduce the thermal effect, thus to extend the stability range. Using this new way, we experimentally obtained a 2.7-W cw laser source at 671 nm by intracavity frequency doubling of 1342nm ofa Nd:YVO4 laser based on the nonlinear crystal LIB3O5. The maximum pump power is 28 W, which is higher than 13 W of the single-end-pumping.     

High-power double-clad large-mode-area photonic crystal fiber laser

High power fiber lasers based on ytterbium-doped large- mode-area photonic crystal fiber (LMA PCF) have been the focus of considerable research[1-3]. Output powers up to 260 W based on the LMA PCF were obtained without any thermo-optical problems or reduction in slope efficiency, only limited by the available pump diode lasers[3]. High power fiber lasers based on the conventional ytterbium-doped step-index fibers require relatively large mode areas to avoid the fiber surface damage caused…     

V型腔腔内和频产生3 W连续波589 nm黄光激光器

报道了双Nd：YAG棒串接V型折叠腔腔内KTP和频全固态黄光激光器，得到了3 W连续波589 nm黄光输出.为了提高黄光输出功率，采用了两种手段：一是通过优化腔型设计使得两束基频在腔内达到了最佳的空间重合，二是通过选择合适大小的二极管激光器的抽运功率使得两束基频在腔内达到了最佳的功率配比. 关键词： 全固态激光器 Nd：YAG激光器 黄光 腔内和频     

4.6-W compact and efficient NdAl_3 （BO_3）_4 thin-disk laser

The capabilities of a compact and highly efficient NdAl 3 (BO 3) 4 (NAB) thin-disk laser are demonstrated.Under a pump power of 8.2 W,the NAB disk laser delivers an average output power of 4.6 W at 1 063 nm,with a slope efficiency of 64%.The difficulty and complexity of the thin-disk laser design are minimized by the high absorbance of the NAB crystal.To reduce the thermal effect,low repetition frequency pulsed 885 nm direct pumping is considered an efficient way to realize a compact and highly efficient NAB thin-disk laser.