Large-energy-cavity-dumped Yb femtosecond laser

Abstract

The invention belongs to the technical field of femtosecond lasers, and discloses a large-energy-cavity-dumped Yb femtosecond laser which comprises a pumping source, an optical coupling system, a planar dichroic mirror, a Yb laser crystal, a first concave mirror, a second concave mirror, an output mirror, a first GTI mirror, a second GTI mirror, a third GTI mirror, a third concave mirror, a nonlinear medium, a fourth concave mirror, a TFP, an electro-optical modulator and a planar mirror. The cavity-dumped laser is based on a high-power Kerr lens mode-locked oscillator, starts mode locking without the help of an SESAM device prone to damage, and guarantees that mode-locked pulses in a cavity have the short pulse width and the high single pulse energy; and after the large-energy short-pulse-width pulse in the cavity is stably oscillated, the electro-optical modulator is used for changing a polarization state of laser, and the pulse laser larger than 0.5 mu J and smaller than 100 fs in pulse width can be effectively guided out and achieved in combination with the TFP.

Description

technical field [0001] The invention belongs to the technical field of femtosecond lasers, in particular to a large-energy cavity-empty Yb femtosecond laser. Background technique [0002] At present: high-energy femtosecond lasers are widely used in cutting-edge scientific research and industrial processing. However, the laser single pulse energy directly output by the femtosecond oscillator is generally on the order of several nanojoules (nJ) or tens of nJ, which cannot meet the requirements of Femtosecond filament formation, high-order harmonic generation, and material micromachining are required. Cavity-dumped femtosecond laser is a laser based on cavity-dumping technology to directly expand the single pulse energy output by the oscillator. Compared with laser amplifiers, its structure is more compact and its cost is lower. [0003] Kerr lens mode-locked (KLM) Ti:sapphire oscillators are one of the schemes for cavity-dumped lasers. In 1993, M. Ramaswamy first reported ...

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Problems solved by technology

[0006] The difficulty in solving the above problems and defects is as follows: As far as the current various cavity-dumped femtosecond lasers are concerned, the cavity-dumped femtosecond lasers that use SESAM mode-locking cannot achieve short-pulse-width femtosecond laser output, and there are extremely It may cause damage to key mode-locking devices, requiring regular maintenance or replacement; cavity-dumped femtosecond lasers using traditional KLM mode-locking cannot use high-power LDs as pump sources, resulting in low output energy of cavity-dumped femtosecond lasers

Solving the above problems has a certain degree of difficulty in device technology and cavity design

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