High pulse repetition frequency mode-locking optical fiber laser

Abstract

A high pulse repetition frequency mode-locking optical fiber laser comprises a pump laser and a laser resonator, wherein the laser resonator is of an FP (Fabry-Perot) cavity structure. A gain medium and a mode-locking component are positioned between end faces of two optical fiber connectors, a bicolor film is plated on the end face of each optical fiber connector, a gain optical fiber is a phosphate optical fiber doped with rare earth ions, the mode-locking component is grapheme, one end of the laser resonator directly outputs via a laser isolator, the other end of the laser resonator is connected with an output end of a wavelength division multiplexer, an input end of the wavelength division multiplexer is connected with the pump laser, the other output end of the wavelength division multiplexer is connected with the laser isolator to output laser light, and the temperature of the laser resonator is controlled by a temperature control system. The high pulse repetition frequency mode-locking optical fiber laser can generate stable picosecond and even femtosecond without external additional modulation, the repetition frequency is larger than 1GHz ultra-short pulse sequence, and the optical fiber laser is simple in structure and capable of realizing all-fiber integration.

Description

technical field [0001] The invention belongs to laser ultrashort pulse, in particular to a high repetition frequency mode-locked fiber laser. Background technique [0002] High repetition rate (referred to as high repetition rate) ultrashort pulse laser is a key technology for high-speed optical sampling, precise distance measurement, precision laser radar and other scientific research, industry, national defense and military applications. It is a hot issue in the field of laser research. A higher repetition rate means a larger longitudinal mode spacing. The longitudinal modes of each order in the frequency domain of the mode-locked pulse sequence above GHz can be distinguished by the existing filter elements, and it is easy to realize the intensity and phase modulation of the single longitudinal mode to obtain the required waveform, so that it can be applied in high-speed optical communication system, laser-matter interaction, quantum dynamics control and other fields. ...

AI Technical Summary

Problems solved by technology

[0008] Ultrashort-cavity mode-locked fiber lasers basically use phosphate fiber as the gain medium, and most of the mode-locked devices use semiconductor saturable absorption mirrors (referred to as SESAMs) [see Byun, H., et al., Compact, stable1GHz femtosecond Er-doped fiber lasers.Appl.Opt., 2010.49(29)], however, the tunable range of SESAMs is very narrow, and requires a very complicated production and packaging process, and special attention should be paid to the heat dissipation

A simple and economical alternative is to use single-walled carbon nanotubes (SWCNTs for short) [Yamashita, S., et al., 5-GHz pulsed fiber Fabry-Perot laser mode-locked using carbonnanotubes. Photonics Technology Letters, IEEE , 2005.17(4)], its operating wavelength depends on the diameter of SWCNTs, and the tunable range is narrow; if a large tunable range is to be obtained, SWCNTs with various diameters must be used, which will lead to increased non-saturation loss and damage threshold The decrease, thus affecting its saturable absorption

Images