Multifunctional CO 2 laser with average power up to 3 kW and its modern applications

Abstract

A laser has been developed on the basis of the CW CO2 laser with DC pumping and cross gas flow [3J. An optical resonator of the laser has been developed on the SFUR (Self Filtering Unstable Resonator) scheme [1]. High beam quality is provided by this scheme (full angle divergence is 0,7 mrad on 0,86 power level at beam diameter 30mm).The laser generates 3 kW output power without any additional equipment. Besides, it is equiped by four accesory units in a feedback arm to provide a variety of operating modes.1 . Single-frequency CW mode with capability of monotone line tuning in bands 9,4 microns and 10,4 microns (about 70 lines in all) with maximum output power up to 2,6 kW at line 10P20 and per-unite frequency instability ofthe order of 10 to the minus 7th. As it has been shown, there is a possibility to reduce a laser line width to 50 kHz. A mode with rapid tuning of the generation line (with about 1 microsec transition time) in combination with anopportunity to form any given spectral-temporal sequence. The generation spectrum and output power are the same, as in mode 1.3 . Repetition-rate Q-switching mode with high peak power (up to 800 kW) and the average one (up to 2,8 kW) with pulse repetition rate control in the range of 1 -100 kHz. 4. The repetition-rate Q-switching mode in combination with line-tuning (such as in mode 1) has been developed for selective photochemistry and laser isotop separation.The results of the applications of the laser with repetition rate mode to producing of a new variety of gas dischargepowerful optical pulsating discharge are presented.

Гомогенное зародышеобразование при лазерно-плазмохимическом синтезе твердых покрытий SiCN из гексаметилдисилазана

“…В отличие от моноимпульсных оптических разрядов оптический пробой и развитие такой плазмы происходят в термодинамически возмущенном газе с остаточной ионизацией и значительной плотностью возбужденных атомов. Такие условия определяют эффект многократного (3−10 раз) снижения порога зажигания пульсирующей плазмы по сравнению с моноимпульсными оптическими разрядами, точнее порога зажигания второго и последующих оптических разрядов после первого оптического пробоя, который инициируется микро/наночастицами или случайными электронами от космического излучения [2][3][4][5][6].…”