CN103135197A - Light path superposition and balance adjusting method based on equal inclination interference principle - Google Patents
Light path superposition and balance adjusting method based on equal inclination interference principle Download PDFInfo
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- CN103135197A CN103135197A CN2013100485544A CN201310048554A CN103135197A CN 103135197 A CN103135197 A CN 103135197A CN 2013100485544 A CN2013100485544 A CN 2013100485544A CN 201310048554 A CN201310048554 A CN 201310048554A CN 103135197 A CN103135197 A CN 103135197A
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Abstract
The invention discloses a method for adjusting light path coincidence and balance based on an equal inclination interference principle. The method includes introducing auxiliary laser beams into an original light path, and adjusting and superposing light paths of two arms in an interferometer by utilizing light and dark annular interference fringes generated by equal-inclination interference of the two laser beams; and adjusting the optical path of one arm of the interferometer, observing the moving process of the equal-inclination interference fringes, wherein the position where the moving direction of the fringes is changed is the balance position or the equal optical path position of the two arm optical paths of the interferometer. The method can quickly and accurately adjust the light paths of the two arms of the HOM interferometer to coincide and balance, but the method is not limited to the adjustment of the HOM interferometer, and can also be applied to other occasions needing to adjust the coincidence and the balance.
Description
Technical field
The present invention relates to a kind of control method of light path, be specifically related to be particularly useful for regulating in entangled photons HOM interferometer the method for light path coincidence and balance based on the light path coincidence of equal inclination interference principle and the control method of balance.
Background technology
Tangling that the right HOM of two-photon (Hong-Ou-Mandel) interferes is gordian technique in quantum information, plays an important role in the application such as quantum clock synchronous, quantum positioning distance measuring, quantum coherent laminar analysis measurement.When carrying out the HOM interference, entangled photons is to inciding on 50/50 beam splitter from two ports respectively, will produce the interference cancellation effect on beam splitter, can record HOM by the coincidence measurement to two exit ports of beam splitter and interfere depression when these two photons overlap fully.
In actual experiment and application process, regulate that two photons incide position on beam splitter and the light path of experience is time-consuming and difficult thing.Usually way is to utilize auxiliary collimated light beam that light path is roughly transferred coincidence, and two arm light beams are incided on the same position of beam splitter, and comes balance-seeking point or aplanatism position by large area scanning.This method utilizes eye-observation to judge whether two light beams overlap, and differentiates error large.Usually in a few to tens of micron number magnitudes, need long time for large area scanning due to the step-length in scanning process, even the longer time just can complete usually will to spend tens of hours.Not only efficient is low for this traditional way, out of true, has also hindered the application in practice of this technology simultaneously.
Summary of the invention
In order to realize that entangled photons to the accurately adjusting fast of HOM interferometer light path, the invention provides a kind of light path coincidence based on the equal inclination interference principle and the control method of balance.The method is introduced secondary laser beams in original optical path, utilize the equal inclination interference principle, by observing the interference fringe pattern, two-beam road adjusting is overlapped; According to the principle of interference pattern of equal inclination center striped order of interference maximum, observe the postulates of relativity direction with the optical path adjusting balance again.
Concrete technical solution of the present invention is as follows:
Should based on the light path coincidence of equal inclination interference principle and the control method of balance, comprise the following steps:
1] introduce auxiliary beam in original optical path, and the auxiliary beam of introducing is carried out beam splitting process, obtain two-beam; The described two-beam that obtains through the beam splitting processing is coupled into respectively in interferometer two arms;
2] regulate the arbitrary arm of interferometer, or interferometer two arms are all adjusted, two-beam is overlapped observing on the beam splitter that arranges on the terminal incident direction;
3] set up lens in the light path before the auxiliary beam beam splitting is processed, and make auxiliary beam along the lens axis vertical incidence, regulate the catoptron of arbitrary arm in interferometer two arms, or the catoptron of interferometer two arms is all adjusted, make to observe on terminal alternately dark and bright rings shape equal inclination fringe to occur;
4] regulate the position of arbitrary arm internal reflection prism in interferometer two arms, the optical path difference of beam splitter experience in the arrival step 2 of change two-way light beam, observe the corresponding moving direction that equal inclination fringe occurs on terminal, according to the highest principle of equal inclination interference center striped order of interference, determine that position that equal inclination interference bar moving direction changes is equilibrium position or the aplanatism position of interferometer two arm light paths.
Above-mentioned steps 4 is specifically:
Regulate the position of arbitrary arm internal reflection prism in interferometer two arms, observe the corresponding movement locus that equal inclination fringe occurs on terminal, whole sweep limit is searched for, in the variation by equal inclination fringe moving direction and fringe spacing is positioned at the equilibrium position of light path more among a small circle; This more among a small circle in scanning successively, be equilibrium position or the aplanatism position of interferometer two arm light paths in the position that the move of stripe direction changes.
In above-mentioned steps 4, the location, equilibrium position specifically utilizes dichotomy and move of stripe direction in conjunction with carrying out.
Above-mentioned observation terminal is optical panel, photodetector or CCD.
Should comprise based on the light path regulating device of equal inclination interference principle the lens, the first beam splitter, interferometer light path, the second beam splitter and the observation terminal that set gradually along input path, described interferometer light path comprises two identical interferometer light splitting optical paths, and the interferometer light splitting optical path comprises right-angle reflecting prism and catoptron.
The invention has the advantages that:
Should utilize the theory of twin-beam equal inclination interference based on the two-photon HOM optical interference circuit control method of equal inclination interference principle, and by the shape of interference pattern, two arm light beams be transferred to overlap, the direction that moves by interference pattern is with the optical path adjusting balance.Utilize the method accurately two-beam to be regulated and overlap and can complete the optical-circuit balance adjusting within a few minutes.
Simultaneously, the method can also change optical panel into photodetector, can realize the automatic adjusting of light path by the FEEDBACK CONTROL to the processing of signal and system, is the quantum technology application providing way of interfering based on HOM.
Description of drawings
Fig. 1 is the adjusting schematic diagram of entangled photons to the HOM interferometer in the conllinear situation;
Fig. 2 is the adjusting schematic diagram of entangled photons to the HOM interferometer in the non-colinear situation;
Fig. 3 is two light beams hot spots on optical panel when not overlapping fully;
The interference pattern that observes on optical panel when Fig. 4 is two beam sections coincidences;
Fig. 5 is the interference pattern of equal inclination that two light beams observe on optical panel when overlapping fully.
Number in the figure is as follows: 1. the hot spot of laser beam, 2. lens, 3. the first beam splitter, 4. right-angle reflecting prism, 5. catoptron, 6. the second beam splitter, 7. optical panel, 8. two separation, 9. two crossing hot spots, the interference pattern when 10. liang hot spot partially overlaps, 11. two hot spot, interference patterns when 12. liang of hot spots overlap fully that overlap fully.
Embodiment
Principle of the present invention is as follows:
Introduce secondary laser beams in former HOM optical interference circuit, make two-beam overlap on beam splitter and see the wire interference fringe on optical panel by vertical pitching and the horizontal deflection of regulating beam splitter, right-angle reflecting prism and catoptron in two arm light paths, this moment, two light paths were roughly regulated coincidence.Add lens in light path, and position and the pitching of adjusting lens make auxiliary laser along the optical axis vertical incidence of lens.
According to the principle of equal inclination interference, will see crooked light and dark interference pattern or alternately dark and bright rings shape interference pattern on optical panel.When crooked light and dark interference pattern occurring, illustrate that two light beams only partially overlap, regulate the pitching of the catoptron in light path and deflection until alternately dark and bright rings shape interference pattern occurs on optical panel, illustrate that two light beams regulate coincidence fully at this moment.
Regulate the HOM interferometer light path wherein position of right-angle reflecting prism in an arm, change the optical path difference that the two-way light beam arrives the beam splitter experience, the upper ring-type postulates of relativity direction of viewing optics screen.According to the highest principle of equal inclination interference center striped order of interference, when the optical path difference of two-way light beam reduces, interference fringe will be moved to the center and be buried in oblivion at central point by the edge; Otherwise when the optical path difference of two-way light beam increases, interference fringe will constantly produce and be moved by middle mind-set edge direction at central point.
Utilize dichotomy that sweep limit is really searched for, fast the equilibrium point position is positioned between two positions of move of stripe opposite direction.This among a small circle in scanning successively, observe the move of stripe direction, be equilibrium point position or the aplanatism position of interferometer two arm light paths in the position that the move of stripe direction changes, and the visual field that observe this moment is uniform.
Describe concrete operation method of the present invention in detail below in conjunction with accompanying drawing.
Referring to Fig. 1, introduce auxiliary laser beam 1 in conllinear entangled photons interferometer light path, vertical pitching, horizontal deflection and the relative position of the first beam splitter 3 in the adjusting light path, right-angle reflecting prism 4, catoptron 5, the second beam splitter 6, hot spot 8,9 on viewing optics screen 7,11 and corresponding interference pattern 10,12 shape and moving direction, optical path adjusting overlaps and balance the most at last.
Introduce secondary laser beams 1 in original optical path, couple light into by the first beam splitter in two arms of interferometer, vertical pitching and the horizontal deflection of regulating the first beam splitter 3, right-angle reflecting prism 4, catoptron 5, the second beam splitter 6 in light path overlap light beam in two arms on the second beam splitter, see two hot spots coincidences and the wire interference fringe occurs on optical panel 7.
Add lens 2 in light path, and regulate position and the pitching of lens 2, allow the optical axis vertical incidence of light beam along lens 2.Vertical pitching and the horizontal deflection of fine setting catoptron 5 see that on optical panel 7 alternately dark and bright rings shape equal inclination fringe 12 occurs.
Regulate in interferometer light path the wherein position of an arm right-angle reflecting prism 4, observe the moving direction of equal inclination fringe.Utilize dichotomy that whole sweep limit is searched for, in the variation of shielding striped 12 moving directions and fringe spacing on 7 by viewing optics is positioned at the equilibrium position of light path very among a small circle, then this among a small circle in successively scanning, the variation of striped 12 on viewing optics screen 7 is equilibrium position or the aplanatism position of interferometer two arm light paths in the position that the move of stripe direction changes.Wherein Fig. 3 is two light beams hot spots on optical panel when not overlapping fully; The interference pattern that observes on optical panel when Fig. 4 is two beam sections coincidences; Fig. 5 is the interference pattern of equal inclination that two light beams observe on optical panel when overlapping fully.
Referring to Fig. 2, the present invention is exactly by introducing auxiliary laser beam 1 in non-colinear entangled photons interferometer light path, light path being adjusted overlapping and balance.The same in its concrete operation method and step and Fig. 1 conllinear situation.
Claims (4)
1. one kind overlaps based on the light path of equal inclination interference principle and the control method of balance, it is characterized in that, comprises the following steps:
1] introduce auxiliary beam in original optical path, and the auxiliary beam of introducing is carried out beam splitting process, obtain two-beam; The described two-beam that obtains through the beam splitting processing is coupled into respectively in interferometer two arms;
2] regulate the arbitrary arm of interferometer, or interferometer two arms are all adjusted, two-beam is overlapped observing on the beam splitter that arranges on the terminal incident direction;
3] set up lens in the light path before the auxiliary beam beam splitting is processed, and make auxiliary beam along the lens axis vertical incidence, regulate the catoptron of arbitrary arm in interferometer two arms, or the catoptron of interferometer two arms is all adjusted, make to observe on terminal alternately dark and bright rings shape equal inclination fringe to occur;
4] regulate the position of arbitrary arm internal reflection prism in interferometer two arms, the optical path difference of beam splitter experience in the arrival step 2 of change two-way light beam, observe the corresponding moving direction that equal inclination fringe occurs on terminal, according to the highest principle of equal inclination interference center striped order of interference, determine that position that equal inclination interference bar moving direction changes is equilibrium position or the aplanatism position of interferometer two arm light paths.
2. according to claim 1 based on the light path coincidence of equal inclination interference principle and the control method of balance, it is characterized in that, above-mentioned steps 4 is specifically: the position of regulating arbitrary arm internal reflection prism in interferometer two arms, observe the corresponding movement locus that equal inclination fringe occurs on terminal, whole sweep limit is searched for, in the variation by equal inclination fringe moving direction and fringe spacing is positioned at the equilibrium position of light path more among a small circle; This more among a small circle in scanning successively, be equilibrium position or the aplanatism position of interferometer two arm light paths in the position that the move of stripe direction changes.
3. the light path based on the equal inclination interference principle according to claim 2 overlaps and the control method of balance, it is characterized in that, in described step 4, the location, equilibrium position specifically utilizes dichotomy and the combination of move of stripe direction to carry out.
4. the light path based on the equal inclination interference principle according to claim 3 overlaps and the control method of balance, it is characterized in that, described observation terminal is optical panel, photodetector or CCD.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359863A (en) * | 2014-12-19 | 2015-02-18 | 郑州轻工业学院 | Free space interference light path balanced detection device |
| CN106597467A (en) * | 2016-11-22 | 2017-04-26 | 北京航天控制仪器研究所 | HOM interference principle-based range finder |
| CN111562009A (en) * | 2020-04-27 | 2020-08-21 | 中国科学院西安光学精密机械研究所 | Common-path angle mirror interferometer and interference method |
Citations (1)
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| CN101113927A (en) * | 2007-08-22 | 2008-01-30 | 中国科学院上海光学精密机械研究所 | Phase-shifting lateral shearing interferometer |
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- 2013-02-06 CN CN2013100485544A patent/CN103135197A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101113927A (en) * | 2007-08-22 | 2008-01-30 | 中国科学院上海光学精密机械研究所 | Phase-shifting lateral shearing interferometer |
Non-Patent Citations (2)
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| 林二妹等: "《迈克尔逊干涉仪的调节技巧》", 《仪器仪表用户》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104359863A (en) * | 2014-12-19 | 2015-02-18 | 郑州轻工业学院 | Free space interference light path balanced detection device |
| CN106597467A (en) * | 2016-11-22 | 2017-04-26 | 北京航天控制仪器研究所 | HOM interference principle-based range finder |
| CN106597467B (en) * | 2016-11-22 | 2019-05-24 | 北京航天控制仪器研究所 | A kind of rangefinder based on HOM principle of interference |
| CN111562009A (en) * | 2020-04-27 | 2020-08-21 | 中国科学院西安光学精密机械研究所 | Common-path angle mirror interferometer and interference method |
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Application publication date: 20130605 |