Ultrashort And Pulsed White Light Raman Fiber Lasers

Raman fiber laser becomes more and more papular relying on its small size,good mode and high efficiency in the field of information transmission from the start. White light laser is different from the traditional laser because of its covers a wider range of the spectrum. It has a great application of white light laser is to detect and identificate in a variety of complex systems by this property. It has good prospects for development in the new generation of laser display technology and other areas.This thesis designs a white light raman fiber lasers to study the theory and experiment of supercontinuum radiation source in the fiber. First of all we action a 9cm sapphier fiber by nanosecond fiber laser to get the new frequency photons at 1038 nm and 1084 nm.in the sapphier,we get the mechanism of spectral broadening is sidelobe effect which caused by self-phase modulation from this study. Secondly we choose a tunable laser with 50 fs pulse width as the pump source action the sappier fiber,we get the supercontinuum in the infrared band and visible band by tuning the pump wavelength. Last we composite resonator by the SESAM and the fiber end face incident,we get repeated oscillation by positive feedback of the resonator in sappier fiber, then it will cause broadening of frequency by self-phase modulation and cross-phase modulation and other phenomena. It will increase the output efficiency of white by this method and it will get a output of white laser with the nearly flat gaussian spectral distribution.We get the linear continuous and smooth and power stability white laser in the range of 480nm-780 nm when the center wavelength of laser is 1200 nm,1300nm,1400 nm,1500nm.