A Mode Splitting Recognition System in Optical Resonator
An optical resonator, mode splitting technology, applied in the structure/shape of optical resonator, material analysis by optical means, laser and other directions, can solve the problem of inability to identify, and achieve convenient operation, easy access, and simple system. Effect
Active Publication Date: 2020-04-10
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Embodiment 1
[0062] For whispering gallery mode optical resonators with inhomogeneous refractive index distribution on the surface, processing defects or nanoparticles in the environment may be adsorbed on the surface of the resonator. When this inhomogeneity overlaps with the mode of the optical resonator, part of the scattered light is transmitted in the opposite direction to the incident light, and this part of the spectral response constitutes the backscattering spectrum of the mode splitting recognition system in the optical resonator. Under normal circumstances, the backscattering spectrum and the transmission spectrum show a consistent corresponding relationship. The transmission spectrum is two downward Lorentz resonance peaks, while the backscattering spectrum is two upward Lorentz resonance peaks. The line of the resonance peak Width and depth correspond to each other. When another path of light is introduced to interfere with the backscattering spectrum, this part of the light i...
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The invention discloses a mode splitting recognition system in an optical resonant cavity, comprising: a laser, an optical fiber beam splitter, a first bitapered optical fiber, a second biconical optical fiber, an optical resonant cavity, a tunable optical fiber attenuator, and an optical fiber Phase shifter, optical fiber beam combiner, detection and display device; optical fiber beam splitter is located on the optical path of the laser output beam, and divides the laser output beam into the first beam splitting and the second beam splitting; the first beam splitting passes through the first biconical The optical fiber is partially coupled to the resonant cavity and then partially coupled out, and output to the detection and display device together with the light directly transmitted along the first double-tapered optical fiber, part of the light scattered by the surface of the optical resonant cavity is transmitted in the opposite direction to the incident light, and coupled To the second bi-tapered optical fiber; the second split light passes through the tunable fiber attenuator and the optical fiber phase shifter, and then outputs to the optical fiber combiner together with the light transmitted in the second bi-tapered optical fiber, and then is output to the detection and display device. The mode splitting recognition system of the invention can improve the spectrum resolution capability of the mode splitting phenomenon.
Description
technical field [0001] The invention relates to the field of micro-nano optical devices, in particular to a mode splitting recognition system in an optical resonant cavity based on interference effects. Background technique [0002] Optical resonators, for example, whispering gallery mode optical resonators are resonators made of materials with a high refractive index and have a circular structure. The light wave propagates through continuous total reflection along the inner surface of the resonant cavity, and interference enhancement occurs when the optical path along the circumference is an integer multiple of the wavelength. The characteristics of small volume and high quality factor of this resonant cavity mode can enhance the interaction between light and matter in the cavity, and it is a high-sensitivity sensing element. The modes propagating along the positive and negative directions in the resonator are in a degenerate state, and the resonant wavelength and mode dis...
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IPC IPC(8): H01S3/08H01S3/00G01N21/39
CPCG01N21/39G01N2021/393H01S3/0014H01S3/08
Inventor 王越赵宏春吴一辉舒风风迟明波
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI