A Kerr lens mode-locked Ti:sapphire laser pumped by a semiconductor laser

Abstract

The invention discloses a Kerr lens mode-locked Ti:sapphire laser pumped by a semiconductor laser, comprising: a first semiconductor laser for emitting continuous laser light in the blue-green band to pump a Ti:sapphire crystal in a resonant cavity; It is used to oscillate and mode-lock the laser in the near-infrared band to output the femtosecond pulse laser; the interferometer makes the femtosecond pulse laser generate a beat frequency signal to obtain the carrier envelope offset frequency; the feedback adjustment unit is used to adjust the front and rear positions of the resonator end mirror and inclination, as well as the output laser power of the semiconductor laser, so as to keep the repetition frequency and carrier envelope offset frequency stable. The invention can output ultra-short laser pulses with stable repetition frequency and carrier envelope offset frequency, and directly uses semiconductor lasers as pumping sources, which greatly reduces the cost of the laser and further reduces the volume of the entire laser.

Description

technical field [0001] The invention belongs to the field of laser technology, and more specifically relates to a Kerr lens mode-locked titanium sapphire laser pumped by a semiconductor laser. Background technique [0002] In 1991, Spence et al first realized the Kerr lens mode-locking of Ti-sapphire femtosecond oscillator, and the mode-locking pulse width was 60fs. Today, Kerr lens mode-locked titanium-sapphire lasers have become one of the most important and widely used ultrashort pulse light sources after long-term development and improvement. [0003] For oscillators and amplifiers based on Ti-doped sapphire, the most suitable wavelength of pump light is in the blue-green band. The original pump source was an argon ion laser. Argon ion laser is an inert gas ion laser, its typical spectral lines are 514.5nm and 488nm, and it has the advantage of high pump power. However, the low conversion efficiency limits its application range. Since 2000, there have been few reports...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above defects or improvement needs of the prior art, the present invention provides a semiconductor laser pumped Kerr lens mode-locked titanium-sapphire laser, thereby solving the problem that the prior art cannot realize the carrier wave with a lower cost and a more simplified system Technical Issues of Femtosecond Laser Output with Envelope Offset Frequency Stabilization

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