Self-sweep-frequency single-frequency green laser

Abstract

A self-sweep-frequency single-frequency green laser comprises a seed source module and a frequency doubling module. The seed source module is an annular cavity, the annular cavity comprises a first doped optical fiber, a second doped optical fiber and a reflection end, the first doped optical fiber serves as a gain medium to generate exciting light, the exciting light is reflected by the reflection end through the second doped optical fiber and then returns to the annular cavity along the second doped optical fiber, and the second doped optical fiber serves as a saturable absorber. The excitation light forms a standing wave structure in the doped optical fiber II and forms a dynamic grating to compress the excitation light ray width and realize self-sweep-frequency single-frequency laser output, the annular cavity outputs self-sweep-frequency single-frequency laser, the wave band of the self-sweep-frequency single-frequency laser is 2 lambda, and lambda is the output green light wave band; the frequency doubling module takes the self-sweep-frequency single-frequency laser as fundamental frequency light, and green light output is realized through frequency doubling. The method has the advantages of good stability, simplicity and convenience in operation and analysis and the like. Sweep frequency output of green light can be achieved, meanwhile, output laser has high monochromaticity, the light path is simple, the size is small, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the technical field of lasers, and particularly relates to a self-sweeping single-frequency green laser. Background technique [0002] Green light source has great application value in detection, medical treatment, biology, communication and so on. However, there are still huge challenges to expand the spectral diversity of green light sources. At present, the way to realize green light is generally the frequency doubling output of solid seed source, the direct output of semiconductor laser or the frequency doubling output of semiconductor laser, the output of optical fiber resonator, and the output of microsphere or microcavity laser. However, in order to make it have the characteristics of wavelength tuning, complex means such as temperature control and electronic control are required. Using the traditional solid-state or fiber laser frequency doubling method requires tuning the seed source, which will lead to increased cos...

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Problems solved by technology

However, limited by the large-scale sweep interval of the seed source, the ultra-fast sweep rate, and the crysta...

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