Synchronously Pumped Self-Starting Femtosecond Ti:Sapphire Laser Oscillator

Abstract

The invention relates to a synchronous pumping self-start femtosecond Ti sapphire laser oscillator. The Ti sapphire laser oscillator comprises a pumping laser source (1) which outputs pumping laser, and a Ti sapphire resonant cavity (4) which comprises a Ti sapphire crystal (21) arranged in the resonant cavity. The pumping laser performs pumping on the Ti sapphire crystal to generate output laser.The cavity length of the Ti sapphire resonant cavity is N times or 1 / N the cavity length of the pumping laser source. The repetition frequency of the output laser generated by the Ti sapphire resonant cavity is 1 / N or N times that of the pumping laser output by the pumping laser source, wherein N is a positive integer. Without any self-start assisting materials, self-start femtosecond modelockedlaser operation can be achieved by matching the cavity lengths of the Ti sapphire resonant cavity and the pumping laser source; the repetition frequency of femtosecond pulses and repetition frequencyof the pumping laser source form a relation of integer multiples.

Description

technical field [0001] The present invention generally relates to the field of ultrafast laser technology, and more particularly relates to a synchronously pumped self-starting femtosecond Ti:sapphire laser oscillator whose output band can be in the near-infrared field. The femtosecond light source is used in time-resolved spectroscopy , femtosecond optical frequency comb frequency measurement technology, ultrashort pulse coherent synthesis technology, ultrafast spectroscopy and other fields have broad application prospects. Background technique [0002] Femtosecond laser, as a kind of laser with high peak power, wide spectral range and extremely short duration in the form of pulses, enables people to obtain femtosecond-level time resolution. The rapid development of femtosecond laser makes it widely used in physics, chemistry, biology, medicine and other fields, opening up new research fields. With the rapid development and maturity of crystal technology, titanium-doped sa...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that when the laser is disturbed by the external environment, it will lose lock. At this time, the laser mode changes from the original pulsed light to continuous light.

To restore the original mode-locked state, the cavity length of the oscillator must be readjusted, and the maintenance operation is more difficult

In addition, the pulse laser repetition rate is determined by the cavity length of the laser. In order to obtain a high repetition frequency pulse laser, the cavity length of the oscillator needs to be shortened, and the KLM effect of Ti:Sapphire is relatively low when achieving a high repetition frequency femtosecond mode-locked laser operation. tougher

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