脉冲诱导放电气体激光器(英文)

Pulsed inductive discharge gas lasers

研究了一种实现新放电方法：诱导圆筒放电的可能性。该放电方法基于不同的粒子数反转机理,使用不同的原子和分子传能模式泵浦气体激光器。研制了用于气体中的脉冲诱导圆筒放电（脉冲感应耦合等离子体）激励系统,并对其进行了实验研究。首次实现了基于原子和分子不同传能模式的4种脉冲诱导激光器,其激励特性是光束发散角小,不同脉冲间的非稳定性在1%以内。首先研制出了基于F原子电子传能模式的红光激光器,这一激光器使用脉冲感应圆筒放电;通过在2.6646.55 kPa气压下激励He-F2（NF3,SF6）混合气获得了在624755 nm波段的8种波长的输出;FI激光器的脉冲能量为2.6 mJ,脉冲持续时间为80 ns,光束发散角为0.4 mrad。同时研制出了基于基态CO2分子传能的10.6μm远红外激光器,该感应激光器在脉冲持续时间（FWHM）为160μs时,获得的最大能量为152 mJ。另外,研制出了近远红外区的基于氢气分子中电子传能的脉冲感应放电氢气激光器,激射谱线为0.835,0.89,1.116和1.122μm,脉冲持续时间为20 ns时获得的脉冲峰值功率为11 kW。最后成功研制了波长为337.1 nm和357.7 nm的基于自限制电子传能过程Cu^3→Bg^3的脉冲感应紫外氮气激光器,在低压为133 Pa的感应氮气激光器中获得的最大能量输出为4.5 mJ,峰值功率为300 kW,脉冲持续时间为（15±1）ns,测得的感应氮气激光器的光束发散角为0.3 mrad。

The investigation results for the possibility of a pulsed inductive cylindrical discharge as a new method of pumping gas lasers operating at different transitions of atoms and molecules with different mechanisms of formation of inversion population are presented.The excitation systems of a pulsed inductive cylindrical discharge（pulsed inductively coupled plasma） in the gases are developed and experimentally investigated.At the first time,four kinds of pulsed inductive lasers on the different transitions of atoms and molecules are created.Characteristic features of the emission of pulsed inductive lasers are ring-shaped laser beam with low divergence and pulse-to-pulse instability is within 1%.Firstly,the red laser on the electronic transitions of atomic fluorine（FI） pumped by a pulsed inductive cylindrical discharge is developed.Lasing at 8 wavelengths in the spectral area 624-755 nm is obtained by exciting He-F2（NF3,SF6） gas mixtures in a pressure range from 2.66-46.55 kPa.The energy of the FI laser is 2.6 mJ at pulse durations of 80 ns and the divergence is 0.4 mrad.Secondly,the far infrared laser on the vibrational-rotational transitions of CO2 molecules in the ground electronic state with a wavelength of 10.6 μm is created.The maximum energy of this inductive laser is 152 mJ at the pulse duration of 160 μs（FWHM）.Thirdly,the pulsed inductive discharge H2 laser at the electronic transitions of hydrogen molecules in near IR laser is also developed.The laser action on four lines with 0.835 μm,0.89 μm,1.116 μm and 1.122 μm is obtained,and its pulsed peak power is 11 kW at duration of 20 ns.Furthermore,the pulsed inductive UV nitrogen laser on self-limited electronic transitions C^3Πu→B^3Πg at 337.1 nm and 357.7 nm is created,and its maximum generation energy is 4.5 mJ at low pressures 133 Pa and pulsed peak power is 300 kW at pulse duration（15±1） ns.The measured divergence of the inductive nitrogen laser radiation is 0.3 mrad.