Tolerance and tuning properties of the optical parametric processes using periodically poled RbTiOAsO 4

Abstract

The maximal tolerance parameters of poling period and phase-matching, temperature in second harmonic generation (SHG) using periodically poled RbTiOAsO 4(PPRTA) as a function of the fundamental wavelength are investigated theoretically. The tolerance of the poling period Δ Λ of PPRTA is found larger than that of PPLN and PPKTP when the fundamental wavelength is beyond 2 μm, which reaches its maximum Δ Λ max for PPRTA at a fundamental wavelength of 2.7433 μm. However, the tolerance for the phase-matching temperature Δ T of PPRTA is found smaller than that of PPLN and PPKTP with an exception that PPRTA has a larger tolerance of the temperature or a larger temperature phase-matching bandwidth at fundamental wavelength of 2.2474 μm, where the maximum of Δ T(Δ T max) is obtained. Furthermore, the tuning characteristics of the optical parametric processes using PPRTA for collinear quasi-phase-matching (CQPM) is analyzed. The combination of temperature tuning and poling period tuning enables a quasi-continuous wavelength tuning range of 1493.2–1593.7 nm for the signal and 3201.8–3699.2 nm for the idler, where poling period of 39 μm, 39.5 μm and 40 μm and a temperature between 20 and 120° have been employed in the corresponding theoretical analysis.