Measurements of N 2 -broadening and pressure-shift coefficients in the ν 3 -band of 12 CH 4 using a cw-OPO

High‐power, continuous‐wave optical parametric oscillator based on MgO:sPPLT crystal

“…Near-infrared lasers have important applications in nonlinear optics, material processing, medical diagnosis, laser ranging, and other fields. [1][2][3][4][5][6] The optical parametric oscillator (OPO) based on the quasi-phase matching (QPM) technology can realize the tuning and expansion of the laser wavelength, which provides more possibilities for laser applications in many fields of science and technology including laser measurement, 7,8 and fingerprint imaging. 9 Periodically poled LiNbO 3 (PPLN), MgO-doped PPLN (PPMgLN), and periodically poled LiTaO 3 (PPLT) crystals are commonly used.…”

Air-induced collisional parameters in the ν3 band of methane

“…The e↵ects of the pressure of N 2 and O 2 on the shape of vibration-rotation lines of the ⌫ 3 band of 12 CH 4 or 13 CH 4 have been rather widely studied experimentally, while airinduced e↵ects received comparatively less attention. Early and some recent measurements involved the use of a Voigt profile to retrieve N 2 , O 2 or air broadening or shift coe cients ( [19,20,21,22] and references therein), including their temperature dependence ( [23,24,25] and references therein). As the Voigt line shape model did usually not fully match the observed line profiles, these measurements were more commonly performed considering Dicke narrowing excluding [12,26,27,28] or including [29,30,31,32,33] line mixing or speed dependence with line mixing [11,34,35].…”