Stable Control Of Regenerative Mode-locking Fiber Laser

Narrow optical pulse is pulse with short duration,wide spectrum and high peak power.It plays an important role in the field of measurement.The development of narrow optical pulse technology will lead to the leap of measurement technology precision,and even produce some new subjects,such as femtosecond chemistry.The most convenient,flexible and practical method for producing narrow pulses is the method of mode-locked lasers.The mode-locked laser can keep the phase difference of each longitudinal mode constant by locking the longitudinal mode of the optical oscillation cavity.In this paper,the stability of the regenerative mode-locked fiber laser is studied.The regenerative mode-locked fiber laser is composed of an optical oscillation cavity and a optoelectronic regenerative cavity.The length of the two cavities determines two set of different fundamental modes.One of the fundamental modes is aligned to form optical oscillation.However,temperature change and vibration disturbance will change the length of the optical oscillation cavity and the optoelectronic regeneration cavity,and directly lead to the drift of the two basic modes.Because of the effect of injection traction,the cavity length drift will not collapse in a small range,but it will deteriorate phase noise.While the cavity length drift is beyond a certain range,the mode-locked pulses will disappear in the optical oscillation cavity.Through the combined control of two cavities,the long time stability of the repetition frequency of the regenerated mode-locked fiber laser is realized,and the regenerated mode-locked fiber laser will not collapse for a long time.Finally,the pictures of the spectrum,the electric spectrum and the pulse of the experiment are given.