A Kerr lens self-mode-locked Ti:sapphire laser based on blue laser diode pumping

Abstract

The invention discloses a Kerr lens self-mode-locked titanium sapphire laser based on novel blue laser diode pumping, Its structural features are: The novel blue laser diode-pumped Kerr lens self-mode-locked titanium sapphire laser comprises a blue laser diode, an aspherical lens, a cylindrical concave lens, a cylindrical convex lens, a 450 nm high-reflector, a plano-convex focusing mirror, a concave mirror, a titanium sapphire crystal, a coupling output mirror, a fused silica triprism and a laser high-reflector. The laser diode has the advantages of small volume, simple structure, high stability, low cost and the like, and is used for replacing the pump source of the traditional titanium sapphire femtosecond oscillator-all-solid-state frequency doubling laser. Therefore, the novel blue laser diode-pumped Kerr lens self-mode-locked Ti: sapphire laser provided by the invention has the advantages of compact, simple structure, stable operation, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of ultrafast lasers, and in particular relates to a Kerr lens self-mode-locked titanium sapphire laser based on blue-light laser diode pumping. Background technique [0002] Shorter pulse widths have been pursued and hoped for since the inception of lasers. Fast time resolution is possible thanks to ultra-short pulse widths. Similar to how high-speed cameras capture high-speed motion, ultra-short-pulse lasers can "freeze" ultra-fast motions like molecules or electrons at a certain moment, so they can be detected Electro-optical sampling of chemical reaction kinetics and high-speed moving electrons, and other femtosecond kinetic processes. The kinetics of molecular decomposition and more complex chemical reaction kinetics can be indirectly probed using ultrashort pulsed lasers. Harnessing ultra-intense lasers offers a whole new range of extreme physical conditions that can only be found in nature in the int...

AI Technical Summary

Problems solved by technology

However, the comprehensive output indicators such as pulse width and average power have not reached the output indicators of the Ti:Sapphire laser pumped by the all-solid-state frequency doubling laser, so there is still a lot of room for development of the LD pumped Ti:Sapphire laser.

[0003] In summary, the existing technical problems are: the maximum output power of a single multi-mode blue LD is 3.5 W, and the maximum output power of a multi-mode green LD is 1.5 W. It is difficult to achieve high power output by pumping Ti:Sapphire with a single LD, so Need to use LD double-sided pumping or combine multiple LDs spatially

Secondly, the quality of the LD beam is poor, and it is necessary to reshape the beam and focus it into the crystal, so that the pump light and the intracavity laser have a better mode matching, in order to realize the self-mode-locked operation of the Kerr lens

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