Passive mode-locking laser with tunable pulse width

Abstract

The invention discloses a passive mode-locking laser with a tunable pulse width. The passive mode-locking laser with the tunable pulse width comprises an 880nm pumping source, a pumping light transmission optical fiber, a pumping light coupling system, a dichroic mirror, a gain crystal, a planar-concave reflecting mirror set, a cavity length regulator, a planar output mirror and a semiconductor saturable absorber, wherein the 880nm pumping source is coupled to the pumping light coupling system through the pumping light transmission optical fiber, the pumping light coupling system is coupled with the dichroic mirror, the dichroic mirror is respectively coupled with the gain crystal and the planar-concave reflecting mirror set, the gain crystal, the cavity length regulator and the planar output mirror are coupled in sequence, the planar-concave reflecting mirror set is coupled with the semiconductor saturable absorber, assemblies between the planar output mirror and the semiconductor saturable absorber jointly form a resonant cavity of a laser, the cavity length regulator is composed of two prisms, and the cavity length of the resonant cavity can be continuously adjusted by adjusting the distance between the two prisms. The passive mode-locking laser with the tunable pulse width can easily adjust the cavity length of the resonant cavity by adjusting the distance between the two prisms, continuously adjusts the laser output pulse width, obtains laser of different pulse widths, and solves the problem that continuously tunable mode locking laser with the output pulse width smaller than 100ps can not be output in the prior art.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a passive mode-locked laser with tunable pulse width. Background technique [0002] All-solid-state picosecond lasers have extensive and important applications in scientific research, medicine, and laser micro-nano processing, such as nonlinear frequency conversion, biophotonics, laser ranging, and laser micro-processing. Different application fields require different mode-locked picosecond pulse widths. For example, the pulse width required for "cold processing" is less than 15ps. In order to regenerate and amplify to obtain kHz high-energy green light, the pulse width required for laser ranging can be relaxed to 30ps. Therefore, the development of passive mode-locked lasers with tunable pulse width has become a current research hotspot. [0003] Passively mode-locked lasers generate high repetition rate optical pulses with extremely narrow pulse widths (10 -10 -10 -15 seconds...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a passive mode-locked laser with tunable pulse width, which is used to solve the problem that the prior art cannot output a continuously tunable mode-locked laser with a pulse width less than 100 ps

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