Tunable small wavelength interval equal power dual wavelength fiber laser
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A fiber laser and wavelength spacing technology, applied in the field of lasers, can solve the problems of unseen small wavelength spacing lasers, unsatisfactory effect, and difficulty in implementation, and achieve the effect of compact structure, stable and reliable performance, and no insertion loss
Inactive Publication Date: 2015-10-28
NORTHWEST UNIV
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These two methods are relatively complicated, very difficult to implement, and the effect is not very ideal
[0004] Due to its small size, high efficiency, good stability, and good beam quality, fiber lasers are developing very rapidly. At present, there are no reports of small wavelength interval lasers in fiber lasers.
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[0052] Such as figure 1 As shown, following the above-mentioned technical solution of the present invention, the tunable small-wavelength interval equal-power dual-wavelength fiber laser of this embodiment includes a fiber laser main body, a tunable filter, and an equal-power controller.
[0053] In this embodiment, taking the dual-wavelength output around 1080 nm as an example, the wavelength interval can be continuously adjusted from 8 nm to 24 nm. (In this embodiment, the neodymium-doped fiber is selected as the doped fiber, which has three gain ranges, namely 1080nm, 940nm and 1320nm, wherein the transition probability at 1080nm is the largest, the gain spectrum is also the strongest, and the gain spectrum is also relatively wide, from 1040nm —1160nm has a strong gain, the maximum gain is at 1080nm, and its front and rear edges are not symmetrical. To achieve dual-wavelength equal power output, the same net gain must be obtained first. This is achieved by two methods, one ...
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Abstract
The invention discloses a tunable small wavelength interval equipower dual-wavelength optical fiber laser which comprises a first optical fiber annular mirror, an optical fiber fixing and pulling support, a triangular vibration transmitter, piezoelectric ceramics, a cushion block, a radio-frequency power source, double cladding non-doped fibers, double cladding doped fibers, a wavelength division multiplexer, a pumping source, a second optical fiber annular mirror, output tail fibers, a collimating lens, a reflecting grating, a first optical power meter, a second optical power meter and an automatic frequency control circuit. The optical fiber annular mirrors, the double cladding non-doped fibers, the double cladding doped fibers and the multiplex end of the wavelength division multiplexer are sequentially connected in a welding mode, and the pumping end of the wavelength division multiplexer is connected with the pumping source in a welding mode. The signal end of the wavelength division multiplexer is connected with the second optical fiber annular mirror in a welding mode. The automatic frequency control circuit is connected with the radio-frequency power source. The tunable small wavelength interval equipower dual-wavelength optical fiber laser is of an all-fiber structure without discrete components, has no insertion loss, and has the advantages of being good in beam quality, high in output power, compact in structure, stable and reliable in performance, and capable of achieving small interval tunable dual-wavelength equipower laser output.
Description
technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a fiber laser, in particular to a tunable small wavelength interval equal-power dual-wavelength fiber laser. Background technique [0002] Lasers with small wavelength intervals can generate THz (also called submillimeter band) output through difference frequency. This method has the advantages of convenient use, room temperature operation, long life and stable performance. But in order to generate an extracavity difference frequency, not only the two wavelengths need to oscillate simultaneously, but also the output intensity (the number of output photons per unit time) should be basically equal. In the experiment, it is not difficult to realize the simultaneous oscillation of these two wavelengths, but it is not easy to achieve the output power of these two wavelengths close to the power output. [0003] At present, most of the research on lasers with small wavelengt...
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