3rd International Congress on Energy Efficiency and Energy Related Materials (ENEFM2015) by Ahmet Yavuz Oral & Zehra Banu Bahsi Oral

Author:Ahmet Yavuz Oral & Zehra Banu Bahsi Oral
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(3)

where interaction length is given by . By applying the principle superposition for electric fields and resonator conditions (3), laser field amplification/damping factor on j-th intersection can be written as

(4)

In our calculations we took into account that ZnSe window transmittance on power of impinging laser beam T = t 2 is slowly varying functions over quite broad interval of wavelength in infrared region T ≈ 0.7, while from inside IC semi-transparent mirror is fully reflective t 2 = 0 In calculations we assume that R = 0.98. Spatial variations of standing waves (resulting laser intensity) in the plane perpendicular to the gas flow at different values of resonant photoabsorption cross section are shown in Fig. 1b. Moreover, as seen from Fig. 1a, instead of expected amplification at resonant frequency we have its strong damping due to absorption by mirrors and target gas (see Fig. 1a). Photons emitted due to subsequent fluorescence cannot be used due to their larger wavelength. Therefore, in order to have laser intensity in the end of resonator still higher than the minimal level I min required to promote selective gas flow separation, initial laser intensity should be quite large. In Table 1 it is shown I CW at different photoabsorption cross sections, which increase over IC length, due to laser intensity decrease caused by absorption. I CW should not exceed maximal allowed level in order to prevent multiphoton dissociation (I max = 2019 W).

Fig. 1Laser intensity damping factor evolution along gas flow centerline (a) and across gas flow (b) at different resonant photoabsorption cross sections (s corresponds to dissociation limit). Mirror reflectivity R = 0.98

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