Research On The Origin And Control Method Of Timing Jitter In A Synchronized Time-lens Source

The synchronized time-lens source is a novel solution to two-color synchronized lasers,and has found successful applications in coherent Raman Scattering(CRS)microscopy.It is expected this source can also be used in other applications necessitating synchronized two-color picosecond and femtosecond pulses.However,the performance of this source can be further optimized,especially the timing jitter performance,whose physical origin was not known before.It is our goal in this thesis to perform detailed theoretical investigation of the optimization strategies for the synchronized time-lens source.We've established a physical model for the synchronized time-lens source,involving the main components of the whole system.Based on the established model,we have obtained the following results:(1)We have identified the physical origins that may contribute to the relative timing jitter,specifically,the stochastic timing jitter of the mode-locked laser,the directional repetition rate drift of the mode-locked laser,the bandwidth of the narrowband RF filter in the synchronized time-lens source,and the noise due to the photodetector;(2)For each origin of the timing jitter,we have proposed optimization strategies.Specific strategies include reducing the stochastic jitter and the directional repetition rate drift of the mode-locked laser,matching the optical delay between the synchronized time-lens source and the mode-locked laser,properly choosing the bandwidth narrowband RF filter,increasing the optical power incident onto the photodetector,and choosing a photodetector with a higher quantum efficiency;(3)We have demonstrated that the timing jitter will be translated into pulse-to-pulse fluctuation of the peak power of the synchronized time-lens source.The larger the intrinsic timing jitter of the mode-locked laser is,the larger this peak power fluctuation of the synchronized time-lens source is.Besides,our results indicate that an effective means of suppressing this peak power fluctuation is to reduce the bandwidth of the RF filter for the phase modulators;Through the aforementioned systematic theoretical investigation,we expect to provide theoretical guidance for the improving the performance of the synchronized time lens light source experimentally,and to expand the scope of its applications.