Fiber-fusion-mode-converter-based angular/radial polarization switchable cylindrical vector beam active-Q-switched fiber laser device

Abstract

The invention discloses a fiber-fusion-mode-converter-based angular / radial polarization switchable cylindrical vector beam active-Q-switched fiber laser device comprising a pump source, a wavelength division multiplexer, a gain fiber, a first fiber polarization controller, a fiber fusion mode converter, a second fiber polarization controller, and an optical isolator. All devices form a fiber resonant cavity by means of fiber coupling. The pump source is connected with the input terminal of the gain fiber by the wavelength division multiplexer; the output terminal of the gain fiber is connectedwith the first fiber polarization controller, the fiber fusion mode converter, and the optical isolator successively; and a few-mode fiber output port of the fiber fusion mode converter is connectedwith the second fiber polarization controller. According to the fiber laser device, the loss of the resonant cavity and establishment of the intra-cavity laser oscillation are controlled by the activeQ-switched technology; the laser pulse width compression is realized; the pulse running flexibility is high; and the pulse output energy, repetition frequency and pulse width can be adjusted flexibly.

Description

technical field [0001] The invention relates to an angular / radial polarization switchable cylindrical vector beam active Q-switching fiber laser based on a fiber fusion mode converter, and belongs to the technical field of fiber lasers. Background technique [0002] Cylindrical Vector Beam (CVB) laser has become an important part of spatially modulated structured beam due to its unique symmetry in amplitude and polarization. It is used in high-resolution optical testing, surface plasmon excitation, particle physics, material processing, It has potential application prospects in research fields such as optical tweezers. At present, the columnar vector beams are obtained mainly through spatial elements such as spatial light modulators, nanostructure holograms, and plasmas. These devices are less compact and have relatively higher insertion loss compared to all-fiber approaches. Recently, fiber lasers have become popular light sources for fiber optic communication and fiber o...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of the prior art in realizing pulsed CVB laser, such as large loss, low efficiency, low stability, limited peak power and pulse tunable performance, the present invention proposes an angular / radial laser based on fiber fusion mode converter. Polarization-switchable cylindrical vector beam active Q-switched fiber laser

Images