Feedback enhancement type polarization-maintaining erbium-doped fiber dual-wavelength random laser

Abstract

The invention discloses a feedback enhancement type polarization-maintaining erbium-doped fiber dual-wavelength random laser. The laser comprises a pump laser light source, an optical fiber wavelengthdivision multiplexer, a first optical fiber polarization controller, a first optical fiber polarization beam combiner, a polarization-maintaining erbium-doped optical fiber, a second optical fiber polarization beam combiner, an optical fiber laser, a first optical fiber coupler, a second optical fiber polarization controller, a first optical fiber isolator, a third optical fiber polarization controller, an electro-optical modulator, an arbitrary waveform generator, a fourth optical fiber polarization controller, a second optical fiber isolator, a second optical fiber coupler and the like. According to the random laser, a random Brillouin dynamic grating is generated in one axis of the polarization-maintaining erbium-doped optical fiber, and pumping is carried out in the other axis of thepolarization-maintaining erbium-doped optical fiber. The random Brillouin dynamic grating enhances the random feedback of the polarization maintaining optical fiber, so that random laser output is generated on the two axes of the polarization maintaining optical fiber, and the random laser has the advantages of the high integration level, the low threshold value and high conversion efficiency.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a feedback-enhanced polarization-maintaining erbium-doped fiber dual-wavelength random laser. Background technique [0002] Since Basov et al. proposed the concept of random lasers in the 1960s, random lasers have gradually become a hot topic in academic research. Different from traditional lasers, random lasers have no fixed reflective cavity, the feedback paths are randomly distributed, and the gain medium can be powder, polymer, fuel or biological tissue. Random lasers have low temporal and spatial coherence and are ideal light sources for optical coherence tomography. However, this kind of random laser has no directionality and high pumping threshold, which severely limits its development. [0003] In 2010, Turitsyn et al. proposed a random laser based on a standard single-mode fiber, using Rayleigh scattering to provide random optical feedback and stimulated Raman scatter...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of existing fiber random lasers, such as high threshold, low conversion efficiency and weak random feedback, the purpose of the present invention is to propose a feedback-enhanced guarantee that uses erbium ions to provide gain for random lasers and Brillouin dynamic gratings to provide random feedback. Erbium-Doped Fiber Dual-Wavelength Random Laser

Images