Modulated oscillator power amplifier (MOPA) type random fiber optic laser device

A technology of fiber laser and random laser, which is applied in the direction of laser scattering effect and the structure/shape of the active medium, which can solve the problems of low conversion efficiency and achieve the effect of improving utilization rate, reducing threshold power and increasing output power

Inactive Publication Date: 2013-04-03
BEIJING UNIV OF CHEM TECH
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[0006] 3. Low con

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  • Modulated oscillator power amplifier (MOPA) type random fiber optic laser device

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[0021] Example 1: The short high-gain fiber placed in front of the laser gain medium is a rare-earth-doped fiber. The upper energy level of this type of fiber has a long lifetime, and a relatively low pump power can store a large amount of energy in the excited state. It is particularly suitable for high-power amplification and has a wide absorption band (800-1064nm) and excitation band (970-1200nm), the choice of pump source is relatively wide. According to the absorption spectrum of ytterbium ion, there are strong absorption peaks at 976nm and 915nm, so a 976nm semiconductor laser can be used as the pump source. The pump light amplified by the ytterbium fiber is directly coupled into the gain medium. The backward Rayleigh scattered light excited in the medium is amplified by Raman, which produces a frequency shift of 13THz, forming a random laser, and the emission wavelength is about 1018.3 nm. Finally, the random laser continues to be amplified through the Ytterbium-doped ...

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Abstract

A modulated oscillator power amplifier (MOPA) type random fiber optic laser device belongs to a random fiber optic laser device system which uses optical fiber as a random laser gain medium. After pump light is coupled into the laser gain medium, Rayleigh backward scattering occurs in the optical fiber due to refractive index in-homogeneity of the optical fiber, and simultaneously the pump light provides gain to Rayleigh scattering light along the optical fiber, and therefore backward Rayleigh scattering light is amplified to form random lasers. The random fiber optic laser device system has the advantages that another short high-gain optical fiber is placed in front of the laser gain medium, and the backward Rayleigh scattering light continues to be amplified after being amplified by Raman. Accordingly, the random fiber optic laser device system is of an MOPA type random fiber optic laser device amplification structure, and furthermore the structure can improve output power of the random fiber optic laser device and reduce threshold power of the pump light. Additionally, the system can achieve double-pass amplification of the pump light, and improve the use ratio of the pump light.

Description

technical field [0001] The invention relates to a random fiber laser system. In this system, the optical fiber is used as the random laser gain medium, and the main oscillator is composed of the pump light and the random laser gain medium. After the pump light is coupled into the fiber, the Rayleigh scattered light generated in the fiber is amplified by Raman to form a random laser, which is the main oscillation process. Amplifiers consist of short high-gain fibers that amplify random laser light. It belongs to the field of new laser devices. Background technique [0002] In the literature Sergei K. Turitsyn, Sergey A. Babin, Atalla E. El-Taher, Paul Harper, Dmitriy V. Churkin, Sergey I. Kablukov, Juan Diego Ania-Castanon, VassilisKaralekas and Evgenii V. Podivilov. Random distributed feedback fiber A random fiber laser system is introduced in laser. Nature Photon.2010, 4, 231–235. In this system, two beams of 1455nm pump light with equal power are coupled into the fiber...

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Application Information

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IPC IPC(8): H01S3/067H01S3/07H01S3/30
Inventor 丁迎春陈露露林静
Owner BEIJING UNIV OF CHEM TECH
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