All-polarization-maintaining femtosecond fiber laser based on hybrid modulation mode locking

Abstract

The invention discloses an all-polarization-maintaining fiber femtosecond laser based on hybrid modulation mode locking, and belongs to the technical field of laser. The laser comprises a nonlinear amplification loop mirror, a linear arm, a first semiconductor laser, a first wavelength division multiplexer and a saturable absorber reflector. The nonlinear amplification loop mirror comprises a polarization-maintaining passive optical fiber, a first polarization-maintaining gain optical fiber and a coupler; the polarization-maintaining passive optical fiber and the first polarization-maintaining gain optical fiber are connected together through the coupler, the first output end of the coupler is connected with one end of the linear arm, and the other end of the linear arm is connected with the saturable absorber reflector; the saturable absorber reflector is used for self-starting mode locking of the laser and serves as a reflector to form a resonant cavity with the annular laser transmission structure to achieve reciprocating oscillation of laser pulses. According to the invention, the saturable absorber reflector is adopted, the mode-locked self-starting of the laser is realized, and the nonlinear amplification loop mirror and the linear arm adopt a full polarization maintaining optical fiber structure, so that the stability of the system is improved.

Description

technical field [0001] The invention belongs to the field of laser technology, and more specifically relates to a fully polarization-maintaining fiber femtosecond laser based on hybrid modulation mode-locking. Background technique [0002] Due to the advantages of extremely short time scale and high peak power, femtosecond laser is widely used in material processing, biomedical imaging, microspectroscopy, communication and other fields. The continuous innovation, development and application development of femtosecond laser technology is the current international It is a very important research field in laser technology and even modern science and technology. On the other hand, due to the large surface area to volume ratio of the optical fiber, the heat dissipation effect is good, and there is no need to install a circulating water cooling device, so that the fiber laser can be greatly miniaturized. In addition, the fiber laser can adopt a full polarization-maintaining fiber ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a fully polarization-maintaining fiber femtosecond laser based on hybrid modulation mode-locking, aiming to solve the problem that the self-starting characteristics and stability of the existing nonlinear loop-mirror mode-locked laser cannot be compatible. got problem

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