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A cascade amplifier, fiber laser technology, applied in the structure/shape of optical resonators, optics, instruments, etc., can solve the problems of limited bandwidth, difficult to achieve power stabilization effect, etc., to achieve improved stability, high pump conversion Efficiency, simple coupling effect
Active Publication Date: 2013-08-07
广东华快光子科技有限公司 +1
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However, the disadvantage of this method is that the bandwidth of the feedback is limited. If the polarization disturbance is large during the amplification process, it is difficult to achieve a good power stabilization effect.
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Embodiment 1
[0033] like figure 2 As shown, this embodiment provides a polarization-stabilized Yb-doped two-stage cascaded fiber laser amplifier, but the gain fiber of this structure is not limited to Yb-doped fibers, and other rare earth ion-doped fibers can also be used.
[0034] The laser includes a laser space isolator 100, a 1064nm first polarization beam splitting cube 201, a second polarization beam splitting cube 202, a 1064nm first fiber collimator 301, a second fiber collimator 302, and a third fiber collimator 303, the fourth optical fiber collimator 304, the first wavelength division multiplexer 401 of 976nm / 1064nm, the second wavelength division multiplexer 402, the semiconductor laser of 976nm as the first pumping source 501, the second pumping source 502 , Yb-doped first gain fiber 601, second gain fiber 602, first Faraday rotator 701, second Faraday rotator 702, 1064nm first total reflection mirror 801, second total reflection mirror 802.
[0035] One reflection end of th...
Embodiment 2
[0039] like image 3 As shown, this embodiment provides a polarization-stable high-power Er-doped double-clad three-stage cascaded fiber laser amplifier, but the gain fiber of this structure is not limited to Er-doped fibers, and other rare earth ion-doped fibers can also be used.
[0040] The laser includes a laser space isolator 100, a first polarization beam splitting cube 201 at 1550 nm, a first polarization beam splitting cube 202, a first fiber collimator 301 at 1550 nm, a second fiber collimator 302, and a third fiber collimator 303, the fourth fiber collimator 304, the fifth high-power fiber collimator 305 of 1550nm, the sixth fiber collimator 306, the first wavelength division multiplexer 401 and the second wavelength division multiplexer of 976nm / 1550nm 402, the first high-power pump beam combiner 403, the semiconductor laser of 976nm is used as the first pumping source 501, the second pumping source 502, the 976nm semiconductor laser of 20W is used as the third pump...
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Abstract
The invention discloses a polarization-stable optical fiber laser cascade amplifier, which comprises a laser space isolator for preventing return seed laser from damaging a seed source, the laser space isolator is connected with a first polarizing beam splitter for splitting laser in different directions, the first polarizing beam splitter is connected with a first optical fiber collimator, the first optical fiber collimator is connected with a first combiner, the first combiner is connected with a first gain optical fiber for generating population inversion, the first gain optical fiber is connected with a second optical fiber collimator, the second optical fiber collimator is connected with a Faraday rotator mirror for rotating the laser polarization angle by 45 degrees, the Faraday rotator mirror is connected with a total-reflection mirror for returning incident light along the original path, the pumping input end of the first combiner is connected with a first pumping source, and one reflecting end of the first polarizing beam splitter servers as a polarization-maintaining pulse output end. The polarization-stable optical fiber laser cascade amplifier has the advantage that the polarization-stable optical fiber laser cascade amplifier can always keep the polarization state of amplified and outputted high-power laser stable in the process of amplification.
Description
[technical field] [0001] The invention relates to a polarization-stabilized fiber laser cascade amplifier. [Background technique] [0002] Fiber lasers are easily coupled with other instruments and can easily obtain high power, which has attracted extensive attention from academia and industry. Laser light waves in any polarization state can be regarded as composed of two completely orthogonal polarization modes. When it is transmitted through an ideal axisymmetric fiber, the polarization state remains unchanged, but due to the fiber manufacturing process, stress, temperature, etc. Factors, there is a birefringence phenomenon in the fiber, and two orthogonal polarization modes in different directions will undergo mode coupling, which introduces instability in the polarization state of the output light. [0003] Fiber lasers with stable polarization state of the output light have important applications in the fields of fiber optic gyroscopes, fiber optic sensing, nonlinear f...
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