Basic physical mechanisms determining performance of the CH3F laser

Diagnostic experiments and modeling of the 118 μm CH3OH laser

“…models have been up to now the main quantitative method used to. evaluate the power efficiency of CW optically pumped FIR lasers [1][2][3][4][5][6]. They omit quantum effects which have been analyzed recently for short wavelengths transitions (Doppler or mixed broadened) by small signal gain measurements [7].…”

“…Then besides the common assumptions to R.E. models [1][2][3][4][5][6][7], the molecular velocities denoted by v must be introduced in the FIR stimulated emission crosssection [1][2][3][4] and in the pump source term [1] which must be fully treated to allow the R.E. model extension at short FIR wavelengths.…”

“…Ae is related to the excited state absorption and h to the hole burning. 3. Experiments and quantitative analysis of the 118 PM CH30H line.…”

Design and performances of a CW CH3OH waveguide laser

“…-We analyze the FIR laser parameters in the framework of our goals, high power level (10-100 mW range whenever possible), emphasis on short FIR wavelengths range (40-300 pm) and ease of operation at different frequencies. Although discarding quantum effects, rate equation models of CW FIR lasers [1][2][3][4][5][6][7][8] describe fairly well a large part of the physical mechanisms involved. They allow to write the FIR output power in a ciosed form which we reproduce for the purpose of the discussion [2,5,8] (*) This work was supported in part by the Groupement de Recherches Coordonnées du C.N.R.S.…”

“…Although discarding quantum effects, rate equation models of CW FIR lasers [1][2][3][4][5][6][7][8] describe fairly well a large part of the physical mechanisms involved. They allow to write the FIR output power in a ciosed form which we reproduce for the purpose of the discussion [2,5,8] (*) This work was supported in part by the Groupement de Recherches Coordonnées du C.N.R.S. n° 11 (Greco Micro-ondes).…”