Mode selection coupler based 8-shaped cavity mode locking column vector fiber laser

Abstract

The invention discloses a mode selection coupler based 8-shaped cavity mode locking column vector fiber laser including a pump source, a wavelength division multiplexer, a gain fiber, a single-mode fiber, a first polarization controller, a second polarization controller, a 3dB coupler, an isolator, a coupler and a mode selection coupler. The output terminal of the pump source is connected with a short wavelength input terminal of the wavelength division multiplexer. The output terminal of the wavelength division multiplexer is connected with a 1 port input terminal of the 3dB coupler through the gain fiber, the single-mode fiber and the first polarization controller successively. A 2 port input terminal of the 3dB coupler is connected with a long wavelength port of the wavelength division multiplexer. A 4 port is connected with a 3 port of the 3dB coupler through the isolator, the coupler and the mode selection coupler successively. Therefore, an 8-shaped resonance cavity is formed. The second polarization controller is connected with a less-mode fiber output terminal of the mode selection coupler. The invention has advantages of being narrow in fiber laser output pulses, high in column vector laser polarization purity, small in loss and low in cost.

Description

technical field [0001] The invention belongs to the field of optical fiber lasers, in particular to an 8-cavity mode-locked cylinder vector optical fiber laser based on a mode selective coupler. Background technique [0002] In recent years, columnar vector lasers, especially columnar vector lasers with ultrashort pulse width, have received great attention because of their symmetrical polarization and intensity characteristics, as well as the focusing characteristics of radially polarized light at high numerical apertures. It is widely used in the fields of material processing, optical tweezers, optical fiber sensing, surface plasmon excitation and optical fiber communication. [0003] At present, cylindrical vector lasers are mainly obtained by precisely adjusting the polarization state of light through bulk free-space devices such as spatial phase modulators, combined half-wave plates, birefringent crystals, and subwavelength gratings. However, the use of the above-mentio...

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Problems solved by technology

[0005] The solution of the present invention is to overcome the disadvantages of complex structure, large loss, low efficiency and expensive production cost of producing ultrashort pulse column vector laser in the prior art, and provide a new method for producing ultrashort pulse column vector laser, that is, based on the mode Choose the 8-character cavity mode-locked cylindrical vector fiber laser with the coupler. All the components of the laser adopt the all-fiber coupling method, which has a compact structure and is not disturbed by external factors. High output efficiency

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