CO₂laser frequency doubling in a new nonlinear AgGa_xIn_1-xSe₂crystal

Second Harmonic of Laser Radiation for IR-Range in Mixed AgGa0.6In0.4Se2Kasumova1 2014Indian Journal of Materials Science0000View full textAdd to dashboardCite

“…To study the ways of increasing frequency conversion efficiency in AgGa In 1− Se 2 crystal of CO 2 laser radiation in IR-range, we will make the numerous calculation of the analytical expression for conversion efficiency (5), received in the constant-intensity approximation; the parameters of the task are chosen according to conditions of existing experiments for the given crystal [4,13]. In Figures 1-3 the dynamic process of frequency conversion is shown to the second harmonic in AgGa 0.6 In 0.4 Se 2 crystal.…”

“…As showed in the result of experiment [4] by researchers, by choosing indium content, it is possible to perform the uncritical condition of 90 ∘ phase matching at second harmonic generation in near and middle IR-range. With this, a value of parameters on wavelength of CO 2 laser radiation = 9.64 mcm is equal to 0.6.…”

“…Moreover, determination of conditions for realizing uncritical phase matching at chosen length of pump wave is important for exclusion of taking down the influence of birefringent walkoff on generation efficiency. This fact allows one to take away the restriction of length of the used crystals [4,7,11].…”

“…We will carry out the calculation of deviation angle from the direction of phase matching Δ according to [7] for three values reflecting indium content in crystal (0, 0.3, and 0.4). With this, Sellmeier coefficients were used cited in [4,12].…”

“…The measured value of quadratic nonlinear susceptibility for AgGa 0. 6 In 0.4 Se 2 crystal is equal to 36 = 41 pm/V [4]. For comparison, the analogous specified value for AgGaSe 2 crystal is equal to 39 pm/V [3,4].…”