Pulse separation and broadening structure based on polarization beam splitting

Abstract

The invention discloses a pulse separation and broadening structure based on polarization beam splitting, which is formed by sequentially rotating angles of a plurality of unit structures in different lengths, bonding with optical cement or directly connecting an optical surface plated antireflection film, wherein each unit structure is formed by combining two identical polarization beam splitters and a tapered quartz crystal or glass; included angles of tapered surfaces on the two sides of the bottom of each unit structure are 45 degrees; in each unit structure, optical surfaces between the two identical polarization beam splitters and the tapered quartz crystal or the glass are coated with the antireflection films; the longitudinal lengths of the unit structures are doubled sequentially; and longitudinal distances among light beam incidence points in the unit structures are optical path differences after light paths are separated and broadened. The structure is applicable to broadening narrow-spectrum and wide-line pulses, can achieve pulse broadening in a nanosecond order, and is suitable for broadening the pulses in different and multiple bands simultaneously.

Description

technical field [0001] The invention belongs to the technical field of optical devices, and relates to a pulse separation and broadening structure based on polarization beam splitting, which is used for widening ultrashort laser pulses. Background technique [0002] Ultrashort laser pulses with high power and high repetition rate have broad application prospects in the fields of material processing, medical treatment, laser chemistry and high-energy physics, and pulse stretching and compression is one of the key technologies in the field of laser technology. Excessively high power pulses will cause damage to some optical devices, so using pulse stretching to reduce the peak power is one of the more common methods. After the power is amplified, the stretched pulse is compressed to obtain an ultrashort laser with high peak power pulse. [0003] Fiber lasers are the third generation of new lasers after traditional gas lasers and solid-state lasers. They have the advantages of ...

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Problems solved by technology

Common pulse stretching methods include the use of gratings, dispersion, nonlinearity, etc. These methods have certain shortcomings, for example, it is not easy to accurately control the amount of stretching or compression; the accuracy of the optical path is high, complex, and the system is unstable; it is not easy to be used in industrial production. Integration; it is difficult to obtain wider broadening for pulses with narrow spectrum, and it is difficult to broaden femtosecond or picosecond pulses with wide spectrum to nanosecond level; it is inevitable to introduce unfavorable pulse compression in the process of high-power optical fiber amplification non-linear phase shift etc.

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