2-micrometer high-pulse energy thulium-doped optical fiber laser of hybrid pump

Abstract

The invention discloses a 2-micrometer high-pulse energy thulium-doped optical fiber laser of a hybrid pump. The 2-micrometer high-pulse energy thulium-doped optical fiber laser comprises a first fiber grating, a first fiber beam combiner, a second fiber beam combiner, a gain fiber and a second fiber grating, which are connected in sequence, wherein a first pumping source is connected with a second input end of the first fiber beam combiner through a first optical isolator, a second pumping source is connected with a second input end of the second fiber beam combiner through a second optical isolator, the first fiber gating and the second fiber gating form a laser resonance cavity, the first pumping source is a continuous laser diode, the second pumping source is a pulsed laser, and the gain fiber is a thulium-doped fiber. The 2-micrometer high-pulse energy thulium-doped optical fiber laser is reduced in the threshold valve energy of a pumping pulsed light in a gain switch technology, is capable of obtaining pulse with higher energy compared with other laser pulse producing technologies such as regulating Q and mode locking, has the characteristics of full-fiber connection, simple structure and the like, and brings convenience for application and popularization.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a hybrid-pumped 2-micron high pulse energy thulium-doped fiber laser. Background technique [0002] In recent years, fiber lasers using gain-switched pulse generation technology have attracted widespread attention, followed by a large number of related research and applications. The significance of this type of laser is that their output wavelength is in the 2 micron spectral region that is safe for human eyes, and has application value in remote sensing technology, biomedicine, and mid-infrared laser generation. Moreover, compared with other pulse generation technologies, such as Q-switching and mode-locking, they have simple structures, no large insertion components, and are easy to realize all-fiber lasers, which brings great convenience to the productization and marketization of lasers. . In addition, since the trivalent cations of thulium have strong absorption at multiple wavelengths, thi...

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Problems solved by technology

With the 1.5 micron band pump, due to the reduction of the above process, regular pulse sequences can be obtained, but it is limited by the energy that the pump source itself can provide (although this problem can also be solved by multi-stage amplification of the pump source, it is also extremely difficult. The complexity of the laser system is greatly increased, and the advantages of the gain switching technology become weak), and the pulse energy obtained by the gain switching technology is also greatly reduced compared with other pump wavelengths

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