Device for detecting particle displacement of optical tweezers system based on double-frequency laser interference
A dual-frequency laser interference and photoelectric detection technology, applied in measuring devices, optical devices, optics, etc., can solve the problems of high detection sensitivity, low bandwidth, and high bandwidth, and achieve high measurement accuracy, simple structure, and strong anti-interference ability Effect
Active Publication Date: 2021-05-04
ZHEJIANG UNIV +1
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Problems solved by technology
However, in general, the spatial resolution of image sensors is limited by pixels and the bandwidth is low
The four-quadrant detector (QPD) method mainly uses the lens system to collect and capture the scattered light of the particles, and determines the displacement of the particles through the change of the distribution of the scattered light on the QPD. It has a high bandwidth and a spatial resolution of the nm order, but the sensitivity is average
Balanced detectors use D-shaped mirrors to cut particle scattering beams, and use the light intensity difference of the two branch beams to measure the position, which greatly improves the position measurement bandwidth and high detection sensitivity, but the detection optical path is more complicated
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[0029] An embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0030] Such as figure 1 As shown, the present invention includes a first laser 1, a beam expander collimation system 2, a fiber coupler 3, a second laser 4, a first beam splitter 5, a second beam splitter 6, a reflective prism 7, an acousto-optic modulator 8, The third beam splitter 9, particle 10, photoelectric detection system 11 and concave mirror 12; the first laser 1 emits the first light beam, the first light beam is coupled into the fiber coupler 3 after passing through the beam expander collimation system 2, and the first light beam passes through The light beam emitted by the fiber coupler 3 is incident on the concave mirror 12 and irradiated on the particle 10 at the same time, the light beam reflected by the concave mirror 12 is irradiated on the particle 10, ...
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The invention discloses a device for detecting particle displacement of an optical tweezers system based on double-frequency laser interference. A first laser emits a first light beam, the first light beam is coupled into an optical fiber coupler after passing through a beam expanding and collimating system, the light beam emitted by the optical fiber coupler of the first light beam simultaneously enters a concave mirror and irradiates the particles, the light beam reflected by the concave mirror irradiates the particles, and the light beam reflected by the concave mirror forms a captured light beam; and the captured light beam forms a light trap to capture the particles. The double-frequency laser interference technology and the concave mirror single-beam optical tweezers are combined together, displacement signals of particles are obtained by measuring Doppler frequency shift information of particle movement in an optical trap and through the phase demodulation technology and the like, and the device has the advantages of being wide in frequency band, high in measurement precision, high in anti-interference capacity, simple in structure and the like.
Description
technical field [0001] The invention relates to a device in the field of dual-frequency laser interference, in particular to a device for detecting the particle displacement of an optical tweezers system based on dual-frequency laser interference. Background technique [0002] The optical levitation system is an emerging subject based on laser control, laser capture and other technologies. It suspends the micro-nano balls through the optical force of the laser beam, and uses the optical force to support the particles instead of the mechanical support. Structure, thereby isolating the interaction between the particle and the environment, avoiding various environmental factors, such as vibration, heat conduction, etc., from interfering with the movement of the particle itself. Therefore, if the micro-nano ball is used to measure the displacement change in the sensor, the performance accuracy is higher. [0003] Dual-frequency laser interferometry is the application of frequen...
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IPC IPC(8): G01B9/02G02B17/02G02B27/09G02B27/30
CPCG01B9/02002G02B27/0927G02B27/0955G02B27/30G02B17/02
Inventor 陈杏藩苏晶晶刘一石李楠胡慧珠
Owner ZHEJIANG UNIV