Highly efficient single longitudinal mode-pulsed green laser

A novel design for a highly efficient 1-kHz single-frequency green laser is proposed.An efficient singlefrequency laser pulse output at 532-nm wavelength may be obtained by combining the injection seeding with intracavity frequency doubling in a compact U-shaped cavity formed by two plano dichroic mirrors in an end-pumping arrangement.The laser is capable of producing green pulses with a total energy of 6.3 mJ at a pulse repetition rate of 1 kHz.The pulse width is about 10 ns and the optical-optical efficiency from the 808-nm pump source to the 532-nm green output is around 12.7%.     

反相高效液相色谱同时分离和测定老鼠体内5种类黄酮化合物

类黄酮化合物是一类结构相似的多酚类化合物,它是由4000多种二级植物代谢物组成的化合物群.根据化学结构特点可以将类黄酮化合物分为5种亚纲:黄酮醇、黄酮、花色素、儿茶酚和二氧黄酮~([1]).     

High-Efficient Nd：YLF Q-Switched Laser Operating at 523.5 nm

An intracavity frequency doubling electro-optically Q-switched Nd： YLF 523.5 nm laser is developed. An appropriate cylindrical lens is employed in the oscillator to optimize the mode size and to improve the stability of the cavity. With an incident pump pulse energy of 58 mJ at a 500 Hz repetition rate, a green pulse energy of 16.8 mJ at 523.5 nm is obtained, corresponding to an optical-optical conversion efficiency of 29%. The pulse width is less than 8 ns, and the beam quality factor is M^2≤ 2.5.     

梯形茚并芴基红绿蓝三色聚合物激光增益材料的设计合成与性能

采用Suzuki聚合方法合成了一类梯形茚并芴基共轭聚合物,其中梯形茚并芴单元分别与蒽(An)、苯并噻二唑(BT)以及双噻吩基苯并噻二唑(TBT)进行交替共聚,得到了蓝(2LF-An)、绿(2LF-BT)、红(2LF-TBT)三色发光的共轭聚合物材料,薄膜状态下,发射波长分别为448、545、632 nm,发射光谱覆盖可见光波段.制备的有机电致发光器件获得了三基色电致发光:2LF-An、2LF-BT、2LF-TBT器件的电流效率分别为1.10、3.11、0.50 cd/A,最大亮度分别为2772、8582、1682 cd/m~2.自发放大辐射(ASE)测试结果显示,2LF-An和2LFBT获得了较低ASE泵浦阈值(Eth),分别为20.90和65.84μJ/cm~2,增益分别为62.40和66.07 cm~(-1),而常见的聚(9,9-二辛基芴-苯并噻二唑)衍生物(F8BT)在相同测试条件下的增益仅为26.88 cm-1.2LF-TBT红光聚合物材料通过掺杂后观察到ASE行为,当掺杂比例为1%时,Eth为88.04μJ/cm~2,增益g为68 cm~(-1).更重要的是,ASE稳定性测试结果表明,所得红绿蓝三色聚合物材料均表现出优异的ASE发光稳定性,即使在200oC退火处理的条件下仍能维持ASE泵浦阈值不发生明显变化.优异的光稳定性和高增益特性使得该类梯形茚并芴基共轭聚合物展现出作为激光增益介质的应用潜力.     

Highly efficient electro-optically Q-switched 473 nm blue laser

An external frequency doubling electro-optically Q-switched neodymium-doped yttrium aluminum garnet(Nd:YAG) 473 nm blue laser was demonstrated. With absorbed pump energy of 48 mJ at 100 Hz repetition rate, about 2 mJ of 473 nm blue laser pulse energy was achieved by cascade frequency doubling. The second harmonic conversion efficiency was 64.5%, and overall optical-optical efficiency was 4.2%, respectively. The blue laser pulse width was less than 10 ns, and beam quality factor was less than 2.4.     

Highly efficient H-β Fraunhofer line optical parametric oscillator pumped by a single-frequency 355 nm laser

A highly efficient laser system output at the H-β Fraunhofer line of 486.1 nm has been demonstrated. A high pulse energy single-frequency hybrid 1064 nm master oscillator power amplifier was frequency-tripled to achieve355 nm laser pulses, which acted as the pump source of the beta barium borate nanosecond pulse optical parametric oscillator. With pump energy of 190 mJ, the laser system generated a maximum output of 62 mJ blue laser pulses at 486.1 nm, corresponding to conversion efficiency of 32.6%. The laser spectrum width was measured to be around 0.1 nm, being in conformity with the spectrum width of the solar Fraunhofer line.     

A 5.9-mJ 500-Hz Electro-Optic Q-Switched 1053 nm Nd：LiLuF4 Laser

An efficient and high power 1053 nm electro-optic Q-switched Nd：LiLuF4 laser, end-pumped by two fiber coupled laser diodes at wavelength 806 nm, is reported for the first time. With an incident pump power of 24.4 W, the maximum laser output power of 7.3 W is achieved in free-running mode, and the optical conversion efficiency is 29.8%. For the Q-switched operation, the shortest pulse width of 17ns is obtained at the pulse repetition rate of 500 Hz, corresponding to the pulse energy of 5.9mJ with the peak power of 0.35 MW.     

高功率高重频U型腔激光器的仿真与实验研究

 为了得到结构紧凑的高功率、高重复频率固体激光器,设计了“U”型光学谐振腔,并利用LAS-CAD软件分析了激光晶体的热效应和激光输出特性。根据仿真结果进行了具体实验,最终得到了腔长400 mm的紧凑型固体激光器。在重复频率为100 kHz,泵浦功率为60 W时,输出功率达到21.6 W,光-光转换效率为36%,斜率效率为39.9%。     

Efficient and compact diode-end-pumped conductively cooled Q-switched Nd:YLF laser operating at 527 nm

A novel, compact diode-end-pumped conductively cooled Q-switched Nd:YLF laser is developed. A diode-end-pumped pair of Nd:YLF slabs and an intracavity-frequency-doubled configuration are adopted to increase conversion efficiency. Using 49.8-mJ incident pump pulse energy at 500-Hz repetition rate, the laser obtains 11-mJ pulse energy and 5.5-W average output power at 527-nm wavelength, achieving an optical-optical conversion efficiency of 22%. The pulsewidth is less than 15 ns, and the beam quality factors are Mx2=1.28 and M y2=1.12.