Femtosecond mode-locked laser

Abstract

The invention discloses a femtosecond mode-locked laser and application of the Nd, Y:SrF2 material in the laser. The laser is used for outputting mode-locked lasers, and comprises a pump source with a focusing system, a laser crystal and an optical system composed of a plurality of optical components, wherein the pump source is used for providing pump lasers and focusing the pump lasers on the laser crystal, the laser crystal serves as a gain medium, the optical system comprises a resonant cavity used for forming a round trip optical path of the lasers, and the laser crystal is arranged in the round trip optical path, and made of the Nd, Y:SrF2 material. Due to the fact that the Nd, Y:SrF2 material is used for making the laser crystal and being applied to laser mode locking, the femtosecond mode-locked laser which is efficient and low in energy consumption and used for emitting sub-hundred-femtosecond lasers is obtained, the purpose that the pulse width is smaller than 100 fs is achieved, output power reaches 100 mW at 1 W pump power, and the problem that a neodymium-doped glass laser is insufficient in output power and poor in heat stability is solved.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a femtosecond mode-locked laser and Nd, Y:SrF 2 Applications of materials in lasers. Background technique [0002] LD (Laser Diode, laser diode) pumped all-solid-state lasers combine the advantages of diode lasers and solid-state lasers, and make up for the shortcomings of both, making LD-pumped all-solid-state lasers better than lamp-pumped solid-state lasers and diode lasers themselves , has the following advantages, such as high overall efficiency; good stability; high beam quality, small divergence angle, high spatial coherence; compact structure, miniaturization; high reliability, long life; easy to achieve single-frequency operation; peak power High; wide wavelength coverage, etc., so its various performance indicators and industrialization have made great progress. [0003] In 1981, Bell Laboratories in the United States successfully developed a collisional mode-locked dy...

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Problems solved by technology

[0005] At present, there have been some reports on Nd ultrafast lasers. The reported lasers have high efficiency and high output power, but their pulse width is on the order of picoseconds, because the fluorescence emission spectrum of the Nd-doped materials used is very small. Narrow, from the Fourier transform limit, not enough to support the generation of shorter femtosecond pulses

[0006] Nd:glass (neodymium glass) laser material is currently the only Nd-doped gain medium that can obtain a pulse width less than 100fs. The shortest output pulse can reach 60fs, but the output power is less than 100mW

And neodymium glass has the disadvantage of poor thermal conductivity, which brings some problems of poor stability

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