Characteristics of a downstream-mixing CO_2 gasdynamic laser caused by behavior of two supersonic flows in a laser cavity

Hashimoto, Takashi; Nakano, Susumu; Hachijin, Michio; Komatsu, Katsuyoshi; Mine, Yasuharu; Hara, Hiroshi

doi:10.1364/ao.32.005936

Cited by 3 publications

References 9 publications

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Experimental research of gasdynamic-cooled discharge CO 2 laser

Kai-wen¹,

Cheng²,

Du³

et al. 1999

SPIE Proceedings

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This paper has reported the configuration and output characteristics of gasdynamic cooled discharge CO2 laser. In the same condition, the pre-mixed gasdynaniic cooled discharge laser's electro-optic transfer efficiency is up to 11. 15%, and there are no obvious difference in its output power and electro-optic transfer efficiency compared with the all-closed laser which needs helium or argon. The designed a downstream-mixed laser can obtain injecting power rate which is greater than 1300W/gsec' and 1%cm' small signal gain coefficient. When the total injecting power is 1 .8KW, the power of the output near basic mode laser is 108W.

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Experimental research of gasdynamic-cooled discharge CO 2 laser

Kai-wen¹,

Cheng²,

Du³

et al. 1999

SPIE Proceedings

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Analysis of the optical extraction efficiency in gas-flow lasers with different types of resonator

Barmashenko

Rosenwaks

1996

Appl. Opt.

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The celebrated Rigrod model [J. Appl. Phys. 34, 2602 (1963)] has recently been shown to be inadequate for calculating the output power of gas-flow lasers when the quenching of excited species is slow and the optical extraction efficiency is high [Opt. Lett. 20, 1480 (1995)]. The previous analysis of two-level systems is presented here in detail and extended to include the chemical oxygen-iodine laser (COIL). For both two-level systems and COIL's, we obtained simple analytic formulas for the output power, which should be used instead of the Rigrod model. We present the formulas for Fabry-Perot, stable, and unstable resonators. Both the saturation parameter and the extraction efficiency differ from those appearing in the Rigrod model. The highest extraction efficiency is achievable for both stable and unstable resonators with uniform intensity distribution over the resonator cross section and is greater than that calculated by the Rigrod model. A rather surprising conclusion is that the extraction efficiency of unstable resonators can be increased substantially if one increases the length of the part of the mirrors lying downstream of the optical axis. The derived formulas are applied to describe published experimental results of supersonic COIL's. The dependence of the power on the threshold gain is evaluated and from this the plenum yield of singlet oxygen is estimated. The value of the yield is in better agreement with experimental measurements than that obtained by the Rigrod model.

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Optical extraction efficiency in gas-flow lasers

Barmashenko

Rosenwaks

1995

Opt. Lett.

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It is shown that the celebrated Rigrod model [J. Appl. Phys. 34, 2602 (1963)] is inadequate for calculating the output power of gas-f low lasers in an important range of parameters in which the quenching of the excited species is slow and the optical extraction eff iciency is high. For two-level systems very simple analytical formulas for the output power are obtained that should be used instead of the Rigrod model. The formulas are given for Fabry-Perot, stable, and unstable resonators. Both the saturation parameter and the extraction efficiency differ from those appearing in the Rigrod model. Applications of the formulas to systems with more complex kinetic schemes are also indicated.

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Characteristics of a downstream-mixing CO_2 gasdynamic laser caused by behavior of two supersonic flows in a laser cavity

Cited by 3 publications

References 9 publications

Experimental research of gasdynamic-cooled discharge CO 2 laser

Experimental research of gasdynamic-cooled discharge CO 2 laser

Analysis of the optical extraction efficiency in gas-flow lasers with different types of resonator

Optical extraction efficiency in gas-flow lasers

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