Second Harmonic of Laser Radiation for IR-Range in Mixed AgGa_𝟎.𝟔In_𝟎.𝟒Se_𝟐 Crystals

Figure 3

Dependences of conversion efficiency of radiation energy of pump wave to energy of wave of second harmonic on AgGa_𝑥In_1−𝑥Se₂ crystal 𝜂₂ as a function of the phase mismatch calculated in the constant-intensity approximation at pump intensity of 𝐼₁₀=0.6 MW/cm² for 𝑥=0.7—AgGa_0.7In_0.3Se₂ (groups of curves 1 and 4), 0.6—AgGa_0.6In_0.4Se₂ (groups of dashed curves 2 and 5), and 1—AgGaSe₂ (group of curve 3). In each group, the upper curve corresponds to wavelength of radiation equal to 9.64 mcm, the middle one corresponds to 9.55 mcm, and lower curve corresponds to 9.31 mcm. Here crystal length of 𝑙=1.05 cm [4] (groups of curves 1 and 2), 0.8 cm [4] (group of curve 3), and 0.65 cm (groups of curves 4 and 5). For AgGaSe₂ crystal 𝛿₁=0.09 cm⁻¹, 𝛿₂=0.15 cm⁻¹ [4] and AgGa_𝑥In_1−𝑥Se₂  𝛿₁=0.06 cm⁻¹, 𝛿₂=0.08 cm⁻¹ [4].