Fiber Optical Parametric Oscillator for Large Frequency-Shift Wavelength Conversion

Analysis of Unwanted Stimulated Raman Scattering in Fibre Optical Parametric Oscillators

“…According to equation (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18), the dependence of the SRS net gain on the delay fibre length is figured out and the result is shown in Fig.3. Fig.…”

“…The signal laser intensity distribution, SRS gain and fibre loss is normally different in different segments of the cavity. The experiment setup in [4] shown in Fig.1 is taken as an example to analyse the unwanted SRS suppression. The photonic crystal fibre (PCF-LMA8, NKT Photonics) is employed as the nonlinear medium, in which the pump laser (1079nm narrow linewidth pules fibre laser, self-made) converts to signal laser based on four-wave mixing (FWM).…”

“…The FWM anti-Stokes acts as pump wave in the establishment of SRS, so it is labelled with P P , which is supposed to exponentially increase in the nonlinear fibre [4][5][6]. It is given by,…”

“…In literature [4], the signal laser peak power p0 reaches 112w. According to equation (26), the SRS net effective gain achieves 32, which is much larger than the threshold 16.5.…”

“…According to equation (26), the SRS net effective gain achieves 32, which is much larger than the threshold 16.5. Correspondingly, serious cascaded SRS has arisen, as shown in figure 7 in [4]. To demonstrate the SRS process under various SRS pump power, the signal laser peak power p0 is reduced to 88.2w, 77.8w, 67.4w, 57.1w and 36.3w by lowering the FWM pump power.…”