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A single-frequency fiber laser oscillator based on optical bistability
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A fiber laser and oscillator technology, applied in the field of lasers, can solve the problems of small depth of refractive index modulation, easily damaged narrow-band filter structure, and no patents or literature reports on high-power single-frequency fiber laser oscillators with several watts. , to achieve the effects of narrow line width, improved efficiency and output power, and improved single-frequency laser output capability
Active Publication Date: 2021-12-14
TIANJIN UNIV
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Problems solved by technology
Therefore, the standing wave field formed by the oscillating laser in the active fiber has a smaller depth of refractive index modulation of the fiber. The oscillator needs to use a longer active fiber as a saturable absorber to meet the conditions of single-frequency operation, and the output The single-frequency laser power is usually at the level of tens of mW, and it is easy to destroy the narrow-band filter structure in the saturable absorber under higher power operation, resulting in multi-longitudinal mode oscillation
[0005] According to literature and patent novelty searches, no patents or literature reports on high-power single-frequency fiber laser oscillators in the order of several watts have been found so far.
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Embodiment 1
[0043] The 1720nm high-power single-frequency fiber laser oscillator based on the optical bistable state of this embodiment builds a bistable frequency selection device by using a thulium-doped active fiber with high absorption characteristics at the laser wavelength, so that the laser is optically bistable Realize high-power single-frequency laser oscillation in the state region. see figure 1 , including: laser pump source 1, wavelength division multiplexer 1 2, active optical fiber 1 3, wavelength division multiplexer 2 4, fiber coupler 5, fiber optic circulator 6, control pump source 7, wavelength division multiplexer Applicator three 8, active optical fiber two 9, fiber Bragg grating 10.
[0044]Wherein, the laser pumping source 1 is a single-mode erbium-doped fiber laser, the wavelength of the pumping light is 1570nm, and the pumping light is output through a single-mode optical fiber with a size of 8 / 125 μm, which is used to pump the active optical fiber-3 to provide la...
Embodiment 2
[0051] What embodiment 2 provides is a kind of 980nm high-power single-frequency fiber laser oscillator based on optical bistability, see figure 1 , including: laser pump source 1, wavelength division multiplexer-2, active optical fiber-3, cladding power stripper 11, fiber coupler 5, fiber circulator 6, control pump source 7, wavelength division multiplexing Device three 8, active optical fiber two 9, fiber Bragg grating 10.
[0052] The main difference between this example and Example 1 is that the laser pump source 1 uses a smaller multi-mode laser pump source, and the control pump source uses a smaller multi-mode control pump source, and the two The wavelengths of the two pump sources are different. The active optical fiber 1 3 and the active optical fiber 2 9 are double-clad active optical fibers. The unabsorbed pump light is separated by the cladding power stripper 11, and the wavelength bands of the output lasers are different.
[0053] Specifically, in this example: th...
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Abstract
The present invention provides a single-frequency fiber laser oscillator based on optical bistable state, comprising a laser pump source (1), a wavelength division multiplexer (2), an active optical fiber (3), a pump filter, Optical fiber coupler (5), optical fiber circulator (6), adjustable pump source (7), wavelength division multiplexer three (8), active optical fiber two (9) and fiber Bragg grating (10), wherein the laser The laser light emitted by the pump source (1) is coupled into the active fiber one (3) through the wavelength division multiplexer one (2), and the pump active fiber one (3) provides laser gain; the active fiber one (3) passes through The pump filter is connected to the fiber coupler (5), and the pump filter is used to separate or strip unabsorbed pump light; one output end of the fiber coupler (5) is used for laser output, and the other output end is connected to the optical fiber The a port of the circulator (6); the central wavelength of the fiber Bragg grating (10) is the same as the wavelength of the output laser, and its idle end is obliquely cut.
Description
technical field [0001] The invention relates to the field of lasers, in particular to a high-power single-frequency fiber laser oscillator based on optical bistable states. Background technique [0002] Single-frequency fiber lasers operate in a single longitudinal mode and fundamental transverse mode state, with excellent coherence and stability, and can be used in high-resolution spectroscopy, sensing, precision measurement, coherent radar and other fields. High-power single-frequency laser has important practical significance for improving the sensitivity of the sensing system and increasing the working distance of coherent detection. [0003] In order to achieve single-frequency laser oscillation in fiber lasers, the laser is required to have a large longitudinal mode interval or use an ultra-narrow-band filter for frequency selection. In the current research, a short linear cavity laser structure is usually adopted to obtain a large longitudinal mode spacing, and a hig...
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