Ultra-narrow line width and wavelength adjustable composite cavity fiber laser device
A fiber laser and ultra-narrow linewidth technology, applied in the direction of lasers, laser components, phonon exciters, etc., can solve the problems of being easily disturbed by the external environment, difficult to apply on a large scale, and unsatisfactory, and achieving low cost , simple structure and reasonable structure
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[0023] The technical solutions of the present invention will be described below in conjunction with the accompanying drawings and embodiments.
[0024] Such as figure 1 As shown, an ultra-narrow linewidth wavelength-tunable composite cavity fiber laser according to the present invention includes a pump light source 1, a wavelength division multiplexer 2, an erbium-doped fiber amplifier 3, a 2×2 fiber coupler 4, The first optical isolator 5, Y-type fiber coupler 6, tunable F-P filter 8, the second optical isolator 7 and semiconductor saturable absorber 9; the wavelength division multiplexer 2, erbium-doped fiber amplifier 3,2 The ×2 fiber coupler 4, the first optical isolator 5, and the Y-type fiber coupler 6 are sequentially connected to form a ring-shaped main resonator, in which the erbium-doped fiber amplifier 3 and the first optical isolator 5 are respectively coupled to the 2×2 optical fiber The second terminal 42 and the fourth terminal 44 of the device 4 are connected,...
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