Frequency interval adjustable multi-wavelength anti-Stokes four-wave mixing (FWM) fiber laser

Abstract

The invention discloses a frequency interval adjustable multi-wavelength anti-Stokes FWM fiber laser. The fiber laser is composed of a pulse light source, a continuum light source, a wavelength division multiplexer (WDM), a high reflective grating, optical fibers, a lower reflective grating and a filter. The central frequency omega p of the pulse light source is close to and smaller than the optical frequency omega o to be obtained, the wavelength of laser output by the continuum light source is adjustable, a frequency omega cw satisfies omega o=omega p+n (omega cw-mega p), the zero dispersion wavelengths of the optical fibers are smaller than the pulse optical wavelength, central wavelengths of the high reflective grating and the lower reflective grating are equal to that of the obtained laser, the central wavelength of a WDM arm connected with the pulse light source is equal to that of the pulse light source, the central wavelength of an ram connected with the continuum light source is equal to that in output light of the continuum light source, and the central wavelength of the filter is equal to the obtained optical wavelength. According to the fiber laser, the output wavelength and the frequency interval are adjustable, the adjusting range of wavelengths is large, and the output wavelength is smaller than that of a pump.

Description

technical field [0001] The invention belongs to the field of fiber lasers, and in particular relates to a multi-wavelength anti-Stokes four-wave mixing fiber laser capable of generating frequencies higher than the pumping frequency and with adjustable frequency intervals. Background technique [0002] Since the light-emitting mechanism of the laser is different from that of ordinary light sources, the output laser has some outstanding characteristics, namely, good directivity, high brightness, good monochromaticity and coherence. These characteristics of it have played a unique role in all aspects of modern science and technology, and have spread across the fields of industry, military, communications, medicine and scientific research. In order to meet different needs, many different types of lasers have been invented successively, including gas lasers (such as helium-neon lasers, CO 2 Lasers, etc.), solid-state lasers (such as yttrium aluminum garnet lasers), semiconductor...

AI Technical Summary

Problems solved by technology

[0007] 1) The wavelengths generated by existing Raman fiber lasers are all realized by Stokes light generated by stimulated Raman scattering, that is, the wavelengths of the obtained light are all greater than the wavelength of the pump light source. Raman Fiber Lasers with Shorter Pump Wavelength Laser Output

[0008] 2) When the wavelength of the pump light is determined, the wavelengths produced by the Raman fiber lasers designed in background technology 1 and background technology 2 are not adjustable; although the Raman fiber lasers in background technology 3 can realize the tunable output wavelength , but the tuned wavelengths are all near the first-order Stokes light, and the output bandwidth is only tens of nanometers

[0009] To sum up, the existing fiber lasers cannot make the output wavelength smaller than the pump wavelength at the same time, but also make the output wavelength adjustable, the wavelength adjustment range is large, and the output frequency interval is adjustable.

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