Self-starting mode locking device and method as well as laser system including device

Abstract

The invention provides a self-starting mode locking device and method as well as a laser system including the device, and particularly provides a self-starting mode locking device used for a titanium doped sapphire crystal femtosecond laser which comprises a reflecting mirror alignment jig mounted with a reflecting mirror and a translation platform fixed with a dispersion compensation component. The self-starting mode locking device comprises piezoelectric ceramic, an electromagnet and a controller, wherein the piezoelectric ceramic is mounted on the reflecting mirror alignment jig and used for adjusting horizontal and vertical attitudes of the reflecting mirror; the electromagnet is mounted to the translation platform and used for enabling the translation platform to move during power on so as to start mode locking of the laser; and the controller is electrically connected with the piezoelectric ceramic and the electromagnet, and controls the piezoelectric ceramic and the electromagnet according to received current signals of output laser of the laser and monitored laser power.

Description

technical field [0001] The invention relates to the field of femtosecond laser technology, in particular to a self-starting mode-locking device and method for a titanium-doped sapphire femtosecond laser and a titanium-doped sapphire femtosecond laser system including the device. Background technique [0002] The self-mode-locking phenomenon of titanium-doped sapphire (hereinafter referred to as titanium sapphire) was discovered by Spence et al. in Scotland in 1990. The advent of this technology can be said to have completely opened a new chapter in the research of ultrashort pulse lasers. The difference between active mode locking and passive mode locking is that for some laser oscillators containing strong Kerr effect media, under a specific cavity structure, stable locking can be achieved without any additional modulation or saturable absorbers. Mode operation, this simple structure combined with Ti:Sapphire laser with ultra-wide tuning bandwidth has become the mainstream ...

AI Technical Summary

Problems solved by technology

The most common way to push the translation stage is to open the laser cover and push it manually, or turn the fine-tuning knob of the translation stage that protrudes from the cover to start the mode locking. This manual method needs to open the laser or punch a hole in the cover to make fine-tuning device extended, more cumbersome

If the external environment is greatly disturbed or the mode-locking state of the laser is not stable, it is necessary to manually start the mode-locking frequently, which virtually increases the complexity of the laser user's work and reduces work efficiency

At the same time, due to air turbulence, people walking, speaking, etc. will cause slight vibration of the mechanical components in the laser, the output power of the laser will gradually weaken or even drop to zero, that is, the long-term stability of the Ti:Sapphire mode-locked laser is poor.

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