光引发脉冲氧碘化学激光器的研究

研究以O_2(~1⊿)-RI-N_2作为反应混合物的光引发脉冲氧碘化学激光,其激光能量输出高于160mJ,O_2(~1⊿)能量利用效率为12％。对O_2(~1⊿)-CH_3I-N_2和O_2(~1⊿)-CF_3I-N_2体系作了比较,以前者为佳。试验也证实以N_2代替Ar作为缓冲气,可得到同样高的激光输出。     

电引发脉冲氧碘化学激光器的增益

本文对脉冲氧碘化学激光器的增益性能进行了理论估算。碘原子由CH_3I电离产生。研究了各种压力条件下成份比和CH_3I离解度对增益系数的影响。     

模拟N2-氧碘化学激光器混合气体脉冲放电实验研究

模拟N2-氧碘化学激光器(COIL)混合气体对O2-N2-CH3I混合气体进行了脉冲放电实验研究,对混合气体的放电波形、注入能量及放电均匀性进行了探索,得到一些实验结果和实验规律.     

放电中有大量碘原子的脉冲氧碘激光器

完成了放电具有大量碘原子的氧－碘化学激光器的初步研究。在系统技术效率很高时，获得与激光器光解方案输出能量可比拟的输出能量。在氯的消耗量相同旦，脉冲功率比连续波氧－碘化学激光器大约高三倍。     

工业用化学氧碘激光器

１引言 化学氧碘激光器是利用电子态跃迁发射近红外光的化学激光器。自从美国空军实验室发明它以后，为军事应用而加强了研究，因为它的高效率和高可扩展性，可能用来做机载反导系统。同时，它的短波长、高效率和高度可扩展性，对工业也很有用。加上它的振荡波长１．３１５μｍ是光纤传输激光功率的理想波长。此外，由于化学氧碘激光器是低压气体激光器，预期有极好的光束质量。 早在１９８０年，Ｆｕｊｉｏｋａ就开始对化学氧碘激光器进行基础研究，目的是做工业应用。接着Ｋａｗａｓａｋｉ重工业社对化学氧碘激光器的商业化感到兴趣，并开…     

俄罗斯化学氧碘激光器的研究

本文对俄罗斯的化学氧碘激光作一综述，包括下列问题，单态氧发生器的发展与研究，连续小脉冲化学氧碘激光运转，二次谐波产生。着重考虑以化学氧碘激光作固体激光器泵浦源的可能性，其基础是化学氧碘激光的二次谐波辐射与一些高效激光材料，即掺Ｃｒ＾３＋晶体的泵浦带一致，因此可以建造化学氧碘与固体的混合激光器，它具有化学泵浦的高效率、高比能存贮、自充分性，又有固体激光器所持有的优秀性能，即具有包括连续波、脉宽为μｓ     

面阵滑闪火花预电离放电引发脉冲氧碘化学激光的实验研究

采用脉冲气体放电可以实现连续波氧碘化学激光器的脉冲化输出来获得高峰值功率。提出了面阵滑闪火花预电离电极结构并解决了大体积辉光放电问题。将这个电极结构应用到脉冲氧碘激光器中,获得了单脉冲能量为4.4 J,脉宽为58 s,峰值功率为75 kW的脉冲激光。脉冲峰值功率与连续波平均功率之比为63。研究了发生器的P和输出耦合镜透射率对激光特性的影响。     

高重复率脉冲频移化学氧碘激光器的进展

总结了高重复率脉冲频移化学氧碘激光器的几个研究领域中的进展，描述了用新颖的固体脉冲磁场系统在10KHZ脉冲重复率上进行的化学氧碘激光器增益开关实验，还描述了用脉冲光解碘激光器作为化学氧碘激光器替代物，在氢中进行的拉曼光频换实验。     

脉冲氧碘化学激光放大器的理论模型

本文提出脉冲氧碘化学激光主振荡器加功率放大器(MOPA)系统中放大器的理论模型。计算表明:氧碘放大器内采用折迭光路方案,可以获得高的放大率及化学效率。     

氧碘化学激光束特性的检测

在氧碘化学激光器上测试激光束的特性,为进一步研究该激光器的“化学问题”和“光学问题”提供了一定的依据。     

High-performance chemical oxygen-iodine laser using nitrogendiluent for commercial applications

A chemical oxygen-iodine laser (COIL), the VertiCOIL device, was transferred from the Air Force Research Laboratory (AFRL) to the University of Illinois at Urbana-Champaign (UIUC) and made operational. The performance of the high-power VertiCOIL laser was measured with nitrogen diluent, New nozzle designs were investigated and implemented to optimize nitrogen performance, Nitrogen diluent chemical efficiencies of 23% were achieved; these are the highest reported chemical efficiencies with room-temperature nitrogen diluent. A long duration, high chemical efficiency test was demonstrated with nitrogen diluent; a chemical efficiency of 18.545 at 30 mmol/s of chlorine was maintained for 35 min. The highest performance was obtained with new iodine injector blocks and a larger throat height. The new iodine injector blocks moved the injectors closer to the throat by 0.7 cm and the throat height was increased from 0.897 to 1.151 cm (0.353 to 0.453 in). The performance enhancements were in qualitative agreement with the system design predictions of the Blaze II chemical laser model. Three-dimensional computational fluid dynamics calculations using the general aerodynamic simulation program code confirmed the principle design change of moving the iodine injectors closer to throat     

Supersonic chemical oxygen-iodine laser with X-shaped streamwise vortex Generator

High-throughput operation of a supersonic chemical oxygen-iodine laser (COIL) is achieved with an advanced mixing nozzle. The mixing nozzle consists of a staggered arrangement of thin wedges lying across the flow duct, and looks like the letter "X" when it is viewed from the side. A 32.9% chemical efficiency is measured experimentally with this nozzle and buffer-gas precooling. Computational fluid dynamics (CFD) calculations are conducted to understand the rapid mixing capability of the nozzle. A series of streamwise vortices generated by the alternating wedges greatly enhances the mixing process in the supersonic stream and the rapid formation of the gain medium. The temperature and Mach number of the flow field are estimated from the gain-profile measurement of the I (/sup 2/P/sub 1/2/) to I (/sup 2/P/sub 3/2/) transition. Good agreement with the CFD calculations is seen.     

Efficient operation of a low-impedance Blumlein discharge initiated HF/DF chemical laser

A study is described on the efficient operation of an HF/DF chemical laser initiated by a low-impedance Blumlein discharge. Some combinations of 0.33 and 0.66-Ω flat-plate Blumlein lines with simple discharge chambers of various active volumes were investigated. For an SF6/H2mixture, an HF laser gave a maximum efficiency of 6.3 percent, and 5 J/1 was extracted. Substitution of D2for H2gave a DF laser output energy as high as 80 percent of the HF chemical laser output.     

Magnetic modulation of gain in a chemical oxygen-iodine laser

A magnetic modulation of gain in a continuous-wave (CW) chemical oxygen-iodine laser (COIL) is proposed for several regimes of laser generation. The principle of the method proposed is based on a direct magnetic modulation of gain in the active zone of a COIL utilizing the Zeeman effect on the laser transition ²P_1/2 -²P_3/2 of iodine atoms. The possible applications of this technique to control the laser generation in COIL for technological purposes are outlined     

Mode locking of a CW supersonic chemical oxygen-iodine laser

This paper presents the results of the first mode-locking experiments on a supersonic chemical oxygen-iodine laser (COIL). Mode locking has been achieved using an acoustooptic modulator (AOM) and lasing demonstrated on the TEM₀₀ modes with a small intracavity aperture. A dc magnetic field was used to increase the number of axial modes and a peak power of 2.5 kW has been reached with a pulse width of 2.1 ns at a repetition rate of 43.68 MHz