Full polarization-maintaining 9-shaped cavity mode-locked laser with high repetition frequency

Abstract

The invention discloses a full polarization-maintaining word cavity mode-locked laser with high repetition frequency, which comprises a pumping source, a non-reciprocal phase shifter, a wavelength division multiplexer, a first optical fiber collimator, a second optical fiber collimator, a first polarization beam splitter, a third half-wave plate, a second polarization beam splitter, a first half-wave plate and a reflector, wherein the non-reciprocal phase shifter is composed of a second half-wave plate, a first Faraday rotator, a quarter-wave plate and a second Faraday rotator which are arranged in sequence; the wavelength division multiplexer comprises a common end, a signal optical end and a pumping end; the pumping source is connected with the pumping end of the wavelength division multiplexer; the signal optical end of the wavelength division multiplexer is connected with the first optical fiber collimator; the common end of the wavelength division multiplexer is connected with thesecond optical fiber collimator through an erbium-doped optical fiber; the output end of the second optical fiber collimator is sequentially provided with the non-reciprocal phase shifter, the firstpolarization beam splitter, the third half-wave plate, the second polarization beam splitter and the reflector; and the output light of the first optical fiber collimator passes through the first half-wave plate and then enters the first polarization beam splitter.

Description

technical field [0001] The invention relates to the fields of optical frequency combs, microwave photonics, timing and synchronization of optical fiber transmission networks, and in particular to a high repetition frequency 9-cavity mode-locked laser with a repetition frequency up to 250 MHz. Background technique [0002] In recent years, fiber-optic femtosecond lasers have attracted more and more attention in the research fields of optical communication, military, optical detection, and medical treatment due to their low cost, compact structure, easy integration, easy portability, and good stability. Among them, passive mode-locked fiber lasers are favored in scientific research and industrial applications due to their advantages such as narrow output pulses, simple systems, and high environmental stability. In passive mode-locked fiber lasers, the repetition rate is one of the main technical indicators. Many application fields, such as optical frequency combs, microwave ph...

AI Technical Summary

Problems solved by technology

Nonlinear polarization rotation mode-locking is realized through the evolution of the pulse polarization state in the fiber, which can obtain better laser output performance, but cannot achieve full polarization maintenance, and the environmental stability is poor

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