Pressure Dependence of the Small-Signal Gain and Saturation Intensity of a Copper Bromide Laser

Abstract

A pair of copper bromide lasers in an oscillator–amplifier configuration is used to investigate the small signal gain and saturation intensity as amplifying parameters and output power of lasers, versus pressure of buffer gas. It is shown that the amplifying parameters and laser output power have a maximum value at optimum buffer gas pressure of 11 Torr. The challenge between microscopic parameters such as stimulated emission cross section, laser upper level lifetime, and population inversion, which determine the values of laser characteristics respective to the operational pressure of buffer gas, are investigated. Thus an optimum delay time of about 10 ns is determined, and a maximum output power equivalent to about 12 W is extracted. The amplifying parameters and measured output power of laser versus delay times show some local maxima and minima at the delay time interval of 6–43 ns.

Various buffer gas effects on amplifying parameters of a copper bromide laser

“…But they did not calculate the amplification parameters for these lasers. Since both of the active length and the radius of the amplifier lasers are larger than the amplifier laser used in the current research, they obtained the output power of 7.1 W at the electrical input power of 2.6 W, so that the current research resulted in a greater output power of 8 W at smaller electrical input power of 1.75 W. Pressure dependence of the amplifying parameters and output power of a CBVL was investigated in an oscillator-amplifier configuration [20]. Both lasers have made the same inner diameter of 20 mm and different active lengths of 28 and 58 cm, respectively.…”

Investigation of operational parameters on copper bromide laser output power

“…Hence, the halide lasers produced to overcome the problems of CVL's. The operating temperature of halide lasers (400-600 o C) depend on the vapour pressure and type of the compounds and is about 500 o C for copper bromide lasers(CBLs) (Aeinehvand, Behrouzinia, Salem, Elahei, & Khorasani, 2017;Dehghani, Khorasani, Sajad, Salehinia, & Behrouzinia, 2011;Gabay, Smilanski, Levin, & Erez, 1977;Lima, Behrouzinia, & Khorasani, 2018, 2019Lima et al, 2017;Little, 1999;Petrash, 1988) which is much lower than of the pure CVL's (1550-1700 o C) (Ashtari, Behrouzinia, Sajad, & Zand, 2011;Behrouzinia, Namdar, Zand, Barry, & Hojabri, 2006;Kazaryan, Petrash, & Trofimov, 1980;Nerheim, 1977). The other advantages of halide lasers are reduction of warm-up time for laser oscillation, which is important in commercial applications, higher pulse repetition frequency, higher wall-plug efficiency and higher beam quality (D. Astadjov et al, 1997;D.…”

The optimum geometrical ratio in halide lasers

“…The problems, which make a single laser with large Fresnel number not suitable for providing high power with good beam quality, are reported (Chang, 1994). The best alternative to obtain high power with good beam quality from halide lasers, as CVLs, is the use of the master oscillator and power amplifier configuration (Aeinehvand, Behrouzinia, Salem, Elahei, & Khorasani, 2017;S Behrouzinia, Sadighi-Bonabi, Parvin, & Zand, 2004;Saeid Behrouzinia, Sadighi, & Parvin, 2003;Lima et al, 2017aLima et al, , 2017b. However, scaling to high output powers requires the active volume to be increased without detriment to another factors such as pulse repetition frequency and specific output energy, which determined the average output powers of laser.…”