Research On Random Fiber Laser Based On Brillouin Raman Mixing Effect

In recent years,multi-wavelength fiber random laser with simple structure is an important research topic in the field of fiber optics.Because of its simple structure,no fixed mirror and high optical quality,it has been widely used in various fields.The hybrid gain fiber laser based on stimulated Brillouin scattering effect(SBS)and stimulated Raman scattering effect(SRS)has become a hot topic in the field of laser research in recent years.Two kinds of multi-wavelength fiber lasers are designed based on the mixed gain of SBS and SRS effects.The work is as follows:1.We design and study a multi-wavelength Brillouin Raman fiber laser with mixed gain using SBS effect and SRS effect(BRFL).The characteristics of the output laser are studied experimentally.The laser is using a simple half-open cavity,Using Raman gain amplification,a stable multi-wavelength Brillouin(Brillouin)laser is obtained.The experimental results show that the BP wavelength will obtain maximum Raman gain in the region of 1555.0nm.When the fixed BP wavelength is 1555.0nm、the power is 7.9d Bm and the RP power is 501.2m W.The multi-wavelength BRFL spectrum of 4.9nm wide,and the signal-to-noise ratio of multi-wavelength Brillouin laser is 19.5d B.When the BP power continues to increase,the peak power of the Stokes light(Stokes)output becomes flatter and more stable.But the number of wavelengths will continue to decrease.2.Designed and experimentally demonstrated a BRFL laser with a simple linear full-open cavity structure that can produce a double Brillouin frequency shift interval.In the experiment,by changing the wavelength and power of the tunable Brillouin pump light(BP)and the power of the Raman pump light(RP).The characteristics of random laser output under co-pumping and reverse-pumping schemes are experimentally studied respectively.The comparison experiment of forward pumping and backward pumping schemes shows.When the pump power of the same RP is831.8 m W,the signal-to-noise ratio of the backward pump output laser is higher than that of the forward pump output laser,and the threshold power of the SBS effect is high.