Kerr lens mode locking Yb: YCOB all-solid-state femtosecond laser pumped by diode

Abstract

The invention discloses a Kerr lens mode locking Yb: YCa4O (BO3) 3 (Yb: YCOB) all-solid-state femtosecond laser pumped by a diode. The laser comprises a pumping source, an optical coupling and focusing system, a Yb: YCOB laser gain medium, a first concave mirror, a second concave mirror, a first triangular prism, a second triangular prism, a plane reflection mirror and a plane output mirror. The central wavelength of lasers output by the pumping source is 976 nm. Kerr lens mode locking is achieved on Yb: YCOB laser crystals for the first time, mode locking pulses of 73 fs are output, and the full width at half maximum of a mode locking pulse spectrum is 19 nm. The laser has the advantages of being excellent in practicability and operability, compact in structure, suitable for repeated production and assembly and volume production and low in cost; the lasers are output in the single direction, repetition frequency is high, the pulse width of sub-100 fs magnitude is achieved, and stability and laser beam quality are high. The laser can be widely applied to the fields of national defense, industries, medical treatment, scientific research and others and has excellent application prospects and high commercial value.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a diode-pumped Kerr lens mode-locked Yb:YCOB all-solid-state femtosecond laser. Background technique [0002] The most mature and stable femtosecond laser is the mode-locked titanium-sapphire laser based on Kerr lens. Although it can already achieve period-level femtosecond pulse output (pulse width less than 5fs), it requires an expensive and complex 532nm laser. As a pump source, it is a kind of "noble" laser, which is mostly limited to some large-scale laboratories with conditions, which limits the research and application in many popular industries. Therefore, the development of all-solid-state lasers directly pumped by semiconductor diode lasers Femtosecond lasers are of great significance for reducing costs and expanding the range of applications. [0003] With the development of high-power and high-brightness laser diodes, various all-solid crystals, ceramics and other mat...

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Problems solved by technology

[0006] The purpose of the embodiment of the present invention is to provide a diode-pumped Kerr lens mode-locked Yb:YCOB all-solid-state femtosecond laser, aiming at solving the problem that the existing Yb:YCOB laser cannot realize pure Kerr lens mode-locking

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