All-solid-state femtosecond laser of passive mode locking Nd,Y:CaF2 of diode pumping

Abstract

The invention discloses an all-solid-state femtosecond laser of passive mode locking Nd,Y:CaF2 of diode pumping. An Nd,Y:CaF2 laser crystal of the laser receives pumping laser penetrating through an optical coupling focusing system and a dichroic mirror; a first concave mirror, a second concave mirror and the dichroic mirror form a compact type confocal folded cavity; a third concave mirror focuses gain laser in a resonant cavity to a semiconductor saturable absorber mirror; the semiconductor saturable absorber mirror is used for starting and maintaining stable mode locking; a first GTI mirror and a second GTI mirror are used for compensating for positive chromatic dispersion in the resonant cavity; a coupling output mirror is used for outputting a stable passive mode locking pulse sequence. The all-solid-state femtosecond laser formed in the mode that a pumping source based on a laser diode is obtained, CaF2 with Nd3+ and Y3+ co-doped serves as a gain medium, the GTI mirrors are used for compensating for chromatic dispersion and the semiconductor saturable absorber mirror is used for starting mode locking, and the stable mode locking pulse sequence with the pulse width of 264 fs is output inside the resonant cavity. A laser diode pumping technology is adopted, so that the all-solid-state femtosecond laser has broader application prospects.

Description

Technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a diode-pumped passive mode-locking Nd, Y:CaF 2 All solid-state femtosecond lasers. Background technique [0002] Laser diodes have the advantages of high power, high brightness, and low cost, and are widely used to pump all solid-state lasers in the near-infrared band. All-solid-state femtosecond lasers directly pumped by laser diodes have become the mainstream research direction of all-solid-state femtosecond lasers in the 1-2μm band. Moreover, the use of laser diode direct pumping is beneficial to obtain high-power femtosecond laser output, which makes the application field of all solid-state femtosecond lasers broader. [0003] In the gain medium of all solid-state lasers, doped with Nd 3+ The ion laser crystal is one of the most widely used crystals. It has the advantages of long fluorescence lifetime and large stimulated emission cross section. So far, there are hund...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a diode-pumped passive mode-locked Nd, Y:CaF 2 All-solid-state femtosecond laser designed to solve existing Nd,Y:CaF 2 The problem of low laser output power

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