High-order dispersion compensation and chirp spectrum widening system

Abstract

The invention provides a high-order dispersion compensation and chirp spectrum widening system. The high-order dispersion compensation and chirp spectrum widening system comprises an impulse oscillator, an optical fiber pre-amplifier, an optical fiber main amplifier and a high-order dispersion compensation and spectrum stretcher, wherein the high-order dispersion compensation and spectrum stretcher is used for performing high-order dispersion compensation and spectrum expansion on pulse which is output by the optical fiber main amplifier and amplified for the second time, and femtosecond laser pulse is obtained. The high-order dispersion compensation and spectrum stretcher comprises a first collimating lens, a half-wave plate, a first reflector, a first diffraction grating, a first diffraction prism, a second diffraction prism, a second diffraction grating, a prism square, a second reflector, a high-power space isolator, a coupling lens, a photonic crystal fiber and a second collimating lens which are arranged in an optical path sequence. With adoption of the high-order dispersion compensation and chirp spectrum widening system, high-efficiency and high-quality optical parametric conversion and ultra-wideband femtosecond pulse laser output can be realized.

Description

technical field [0001] The invention relates to the fields of ultrashort pulse laser and nonlinear optics, in particular to a high-order dispersion compensation chirp spectrum broadening system. Background technique [0002] In recent years, with the continuous improvement of the production level of fiber optic devices and gain fibers, the pulse amplification system based on double-clad doped fibers has developed rapidly. The output continuous optical power of single-mode fibers can reach 10KW. The chirp pulse amplification system has obtained a laser output with a single pulse energy of 5.7mJ, a pulse width of 200fs, and an average pulse power of 230W. In the high-power ultrashort pulse amplification system, the gain-narrowing effect and high-order dispersion mismatch are the main reasons that limit the further narrowing of the laser pulse width. Among them, the high-order dispersion of the fiber itself, the distortion of the chirped pulse shape, and the residual third-ord...

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Problems solved by technology

However, the wider pulse width of the picosecond light source leads to an increase in the required pump power, which is likely to cause damage to the end face of the photonic crystal fiber, and the requirements for the end face treatment are more stringent; the use of a picosecond light source will greatly weaken the supercontinuum and the pump light source. coherence, or even completely degenerate it; on the other hand, the picosecond light source has a large second-order and third-order dispersion, and the chirp parameters are complex, and these characteristics will also be transferred to the supercontinuum optical pulse, and even deteriorate

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