CN1291531C - Displacement self-sensing HeNe laser system with cats eye as endoscope - Google Patents
Displacement self-sensing HeNe laser system with cats eye as endoscope Download PDFInfo
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- CN1291531C CN1291531C CN 200310115540 CN200310115540A CN1291531C CN 1291531 C CN1291531 C CN 1291531C CN 200310115540 CN200310115540 CN 200310115540 CN 200310115540 A CN200310115540 A CN 200310115540A CN 1291531 C CN1291531 C CN 1291531C
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Abstract
The present invention relates to a shift self-sensing HeNe laser system which uses a cat eye as an endoscope. The present invention belongs to the technical field of laser shift sensing. The present invention is characterized in that the shift self-sensing HeNe laser system is composed of a convex lens and a concave lens; moreover, a cat eye with adjustable space is arranged between the convex lens and the concave lens for replacing a reflecting mirror in a half inner cavity laser; the cat eye is connected with a measuring rod capable of moving on a guide rail; a birefringence element in the half inner cavity laser is an anti-reflection window sheet positioned on a port of a discharge tube, and anti-reflection films are plated on a left light penetrating surface and a right light penetrating surface of the anti-reflection window sheet; a force augmentation ring is additionally buckled on the window sheet. The goal that the proportion of the longitudinal mode spacing to a light emitting bandwidth is 4: 3 can be easily realized by the simple adjustment of the laser. Moreover, the laser power is relatively stable in the process of the movement of the cat eye. The imbalance of a laser cavity is avoided. The present invention ensures the normal operation of the system in a large measuring range.
Description
Technical field
The displacement self-sensing HeNe Optical Maser System of making the chamber mirror with opal belongs to the laser displacement field of sensing technologies.
Background technology
Several laser physics phenomenons of Chinese patent " displacement self-sensing HeNe Optical Maser System and its implementation " (ZL 199103514.3) comprehensive utilization, as laser frequency division phenomenon, mode of laser warfare, the tuning phenomenon of laser power etc., a common HeNe laser is transformed into a kind ofly do not utilize interference but have the simple relatively again displacement sensing instrument of self calibrating function.This method has the displacement measurement resolution (for wavelength is the HeNe laser of 0.6328 μ m, and λ/8 are 79nm) of λ/8.The agent structure of this invention is half a common inner chamber HeNe laser, and one of two reflecting cavity mirror is connected in a straight line guide rail (measuring staff) as index glass and goes up so that can axially move along laser optical axis.This method has potential application foreground widely.But, can not overcome following problem so that in the process of instrumentation, run into difficulty because of it.During the displacement of displacement self-sensing HeNe Optical Maser System Measuring Object, the displacement of object under test is the mobile laser chamber mirror that passes to by measuring staff.Measuring staff can be swung because of its linearity error and gap in moving process, and drives the chamber mirror swing of laser, thereby causes optical cavity off resonance (promptly the collimation of two chamber mirrors is destroyed).Therefore, in the moving of measuring staff, the output intensity of laser is extremely unstable, suddenly big or suddenly small, at times strong and at other times weak, even usually stops bright dipping.So the size of the measuring range of existing displacement self-sensing HeNe laser has contingency.Survey for one and time may reach 7mm, and next the survey time may have only 1mm.The machining accuracy of expectation raising measuring staff solves this problem and also has difficulties.Such as: the measuring staff that 3cm is long, the mirror angle that axle-interporal lacuna of 3 μ m brings is deflected to 20 seconds, and this corner can destroy the stability of laserresonator.It two is that former patent is debug difficulty.With regard to the basic principle of system, must accomplish simultaneously: 1. control the ratio (4: 3) of longitudinal mode spacing and bright dipping bandwidth, reach that this requirement is should control chamber long carries out decay again, unusual trouble, 2. laser must the fundamental transverse mode running.Therefore adjusting comparatively wastes time and energy.
Summary of the invention
The objective of the invention is to use one " opal " to replace a speculum of displacement self-sensing HeNe laser, still can keep the stable of laser output intensity when making it implement large-range measuring.Realize the instrumentation of displacement self-sensing HeNe Optical Maser System, it is applied on a large scale.Simultaneously, make to debug and become easy.
Make the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal, by a half-intracavity laser, place the birefringence element in the laser cavity, the photodetector and follow-up signal processing and the displacement display unit etc. that place polarization splitting prism outside the chamber on the laser output mirror one end optical axis and receive the two-beam that is separated by prism are formed.This system has used one " opal " to serve as speculum of laser cavity and has been fixed together with measuring staff, and the testee displacement is to promote measuring staff to move, and measuring staff promotes " opal " displacement again.
The invention is characterized in: described laser mirror is one with can the opal that the measuring staff that move is fixed on being housed on the guide rail of spring, described opal is made of with the concave mirror that is coated with high-reflecting film the convex mirror of two-sided plating anti-reflection film, and the radius of curvature of the focal length of the spacing of convex lens after overregulating and concave mirror and convex lens, concave mirror equates, promptly reaches " opal " condition.
Described birefringence element is to constitute by being positioned at the reinforcing ring that discharge tube one end and left and right two logical light faces all are coated with the anti-reflection window of anti-reflection film and are buckled in this anti-reflection window periphery.
The guide rail of described measuring staff, discharge tube, concave mirror are that concave output mirror, spectroscope are that polarization splitting prism and photodetector are connected on the same cylinder jointly.
The guide rail of described measuring staff, discharge tube, concave output mirror, polarization splitting prism and photodetector all are fixed on the same planar bracket.
Experimental results show that: at first, " opal chamber " better adjusted than traditional flat-concave cavity, needn't just can adjust the collimation of chamber mirror with angular instrument or spider aperture, can make the interior bright dipping of whole guide rail moving range even.Secondly, suitably adjust the distance between " opal " middle convex lens and the concave mirror, be easy to make the mode laser fundamental transverse mode running.Moreover, along optical axis lateral translation " opal ", the may command laser gain, the ratio that easily reaches longitudinal mode spacing and bright dipping bandwidth is 4: 3 a purpose.
Below in conjunction with accompanying drawing the effect that the present invention brings is described further.Power tuning curve when Fig. 5 changes different length for optical cavity, experimental data shows " opal " optical cavity power stability in moving process.Fig. 6 is for measuring the contrast and experiment of same displacement gained with said " nano laser survey chi " among HP two-frequency laser interferometer and the present invention.Experiment shows that the resolution of making the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal is 79nm, the linearity 0.0047%, and measuring range reaches 12mm, finally becomes a real practical instrument.
Description of drawings
Fig. 1. make the embodiment one (column structure) of the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal.
Fig. 2. make the embodiment two (plank frame) of the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal.
Fig. 3. the schematic diagram of cat.
Fig. 4. make the embodiment of cat in the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal.
Fig. 5. make the design sketch (the power tuning curve under the long change amount of different cavity) of anti-imbalance in the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal.
Fig. 6. make the contrast and experiment of the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal with the HP two-frequency laser interferometer.
Embodiment
The present invention is said make the theory structure of the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal can be referring to Fig. 1.Concave output mirror 01, laser gain pipe 02 and opal 03 (be made of convex lens 04 and concave reflection 05, and 04 focal length equating with 05 radius of curvature) are formed the HeNe laser of one and half inner chambers.Opal 03 is fixed on the measuring staff 06.Moving to left of measured object 07, spring 08 compress the right-hand member of measuring staff 06 and measured object 07, are delivered to fully on the opal 03 with the displacement that guarantees measured object 07.Promote measuring staff 06 during measured object 07 displacement, measuring staff 06 promotes opal 03 and moves, and laser chamber long (being the distance between concave output mirror 01 and the concave mirror 05) changes.Laser gain pipe 02 right-hand member has anti-reflection window 09, about it two logical light faces all be coated with anti-reflection film with reduce light by the time the boundary reflection loss.10 pairs of anti-reflection windows 09 of afterburning ring apply a power.The effect of power makes the light component that forms two frequency differences, polarization state quadrature in the laser., after polarization splitting prism 11 beam splitting, incide respectively on two photodetectors 12,13 from the pairwise orthogonal light beam of laser left end output.Along with measured object 07, measuring staff 06, the change in displacement of opal 03, laser output polarization state of light generating period sexually revises: directional light output → directional light and vertical light are all exported → vertical light output → unglazed output.When being subjected to displacement in the process output polarization state periodically-varied along with determinand 07, photodetector 12 and 13 will be illuminated in turn: 12 be illuminated → 12 and 13 be illuminated simultaneously → 13 be illuminated → 12 and 13 be not illuminated.The each change means that the displacement of λ/8 has taken place for measured object 07, measuring staff 06, opal 03.Handle by signal processing circuit 14 subsequently, just can in display circuit 15, show the displacement that is measured.
Below each figure is described
Fig. 1. in the column structure of system, the guide rail 16 of measuring staff 06, laser gain pipe 02, concave output mirror 01, polarization splitting prism 11, photoelectric detector 12,13. are fixed on the same cylinder 17 (as quartzy shell) jointly.
Fig. 2. what plank frame was different with Fig. 1 column structure is, the guide rail 16 of measuring staff, laser gain pipe 02, concave output mirror 01, polarization splitting prism 11 and photoelectric detector 12,13 can be fixed on the planar bracket 18.Also can not adopt stress birfringence among this embodiment, generation be another birefringence element 19 (as quartz crystal).The same Fig. 1 of other parts.
Fig. 3. be said opal schematic diagram among the present invention.Light beam incides on the two-sided convergent lens 04 that is coated with anti-reflection film, and outgoing is after be coated with concave mirror 05 reflection of high-reflecting film, and last former direction is returned, and is irrelevant with incidence angle.05 radius of curvature R and 04 focal distance f equate, and spacing between the two also approximates f, but suitably adjustable.
Fig. 4. cat be applied in the displacement self-sensing HeNe laser system embodiment.Measuring staff 06 is supported by guide rail 16, and left end is equipped with opal 03 on 06, and wherein concave mirror 05 is anchored on 06, and convergent lens 04 is supported by sleeve 20, and regulating sleeve 20 can change the spacing between 04 and 05.For guaranteeing that measuring staff 06 contacts with the tight of testee 07, be provided with a stage clip 08 at measuring staff 06 and 16 on guide rail.
Fig. 5. the displacement self-sensing HeNe Optical Maser System of making the chamber mirror with opal is power tuning curve stability relatively (long by apply the sawtooth waveforms humorous chamber of transferring on piezoelectric ceramic) when different displacement.Power tuning curve when (a) not being subjected to displacement, the power tuning curve when (b) having displacement to be 4mm, the power tuning curve when (c) displacement is 8mm, the power tuning curve when (d) displacement is 12mm.
Fig. 6. make the contrast and experiment of the displacement self-sensing HeNe Optical Maser System of chamber mirror with opal with the HP two-frequency laser interferometer.Utilize this measuring system to measure same displacement simultaneously with the HP interferometer, this displacement is approximately with the 0.2mm step change.Native system meter umber of pulse, and the displacement that the interferometer record is surveyed.Finally be abscissa with the umber of pulse, displacement is that ordinate is set up data and curves as shown in the figure.
Claims (4)
1, with the displacement self-sensing HeNe Optical Maser System of opal as the chamber mirror, comprise one by discharge tube, be fixed on the laser output mirror of this discharge tube one end, place the half-intracavity laser of the removable laser mirror composition of the discharge tube other end, be arranged on the birefringence element in this laser chamber, be arranged on the polarization spectroscope and the reception of laser output mirror one end on the outer optical axis of this laser chamber and handle two photodetectors of the two bundle polarised lights of telling by this mirror, two amplifiers and signal processing and displacement display circuit, it is characterized in that: described laser mirror is one with can the opal that the measuring staff that move is fixed on being housed on the guide rail of spring, described opal is made of with the concave mirror that is coated with high-reflecting film the convex mirror of two-sided plating anti-reflection film, and the focal length of the spacing of convex lens after overregulating and concave mirror and convex lens, the radius of curvature of concave mirror equates, promptly reaches " opal " condition.
2, according to claim 1 with the displacement self-sensing HeNe Optical Maser System of opal as the chamber mirror, it is characterized in that: described birefringence element is to constitute by being positioned at the reinforcing ring that discharge tube one end and left and right two logical light faces all are coated with the anti-reflection window of anti-reflection film and are buckled in this anti-reflection window periphery.
3, according to claim 1 with the displacement self-sensing HeNe Optical Maser System of opal as the chamber mirror, it is characterized in that:
The guide rail of described measuring staff, discharge tube, concave mirror are that concave output mirror, polarization spectroscope are that polarization splitting prism and photodetector are connected on the same cylinder jointly.
4, according to claim 1 with the displacement self-sensing HeNe Optical Maser System of opal as the chamber mirror, it is characterized in that: the guide rail of described measuring staff, discharge tube, concave output mirror, polarization spectroscope and photodetector all are fixed on the same planar bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310115540 CN1291531C (en) | 2003-11-28 | 2003-11-28 | Displacement self-sensing HeNe laser system with cats eye as endoscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310115540 CN1291531C (en) | 2003-11-28 | 2003-11-28 | Displacement self-sensing HeNe laser system with cats eye as endoscope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1547293A CN1547293A (en) | 2004-11-17 |
| CN1291531C true CN1291531C (en) | 2006-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200310115540 Expired - Fee Related CN1291531C (en) | 2003-11-28 | 2003-11-28 | Displacement self-sensing HeNe laser system with cats eye as endoscope |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304814C (en) * | 2005-02-25 | 2007-03-14 | 清华大学 | Self-mixed interference HeNe laser displacement transducer with direction recognition function |
| CN1312488C (en) * | 2005-04-01 | 2007-04-25 | 清华大学 | Optical feedback range finder for two-frequency laser based on Zeeman-birefraction |
| CN1317543C (en) * | 2005-10-21 | 2007-05-23 | 清华大学 | Self-sense displacement helium-neon laser system with cat eye folding cavity |
| CN106125248A (en) * | 2016-08-17 | 2016-11-16 | 南京法珀仪器设备有限公司 | A kind of adjusting means being applicable to opal chamber mirror |
| CN110440698B (en) * | 2019-08-14 | 2020-12-11 | 大连理工大学 | Laser measuring probe device for measuring any surface form and position error |
| CN111799650A (en) * | 2020-06-02 | 2020-10-20 | 中国科学院西安光学精密机械研究所 | Saturated absorption spectrum frequency stabilization optical system with cat eye reflector |
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2003
- 2003-11-28 CN CN 200310115540 patent/CN1291531C/en not_active Expired - Fee Related
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| CN1547293A (en) | 2004-11-17 |
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Assignee: Fujian Castech Crystals, Inc. Assignor: Tsinghua University Contract fulfillment period: 2009.4.1 to 2014.3.31 contract change Contract record no.: 2009110000295 Denomination of invention: Displacement self-sensing HeNe laser system with cats eye as endoscope Granted publication date: 20061220 License type: exclusive license Record date: 20091123 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.4.1 TO 2014.3.31; CHANGE OF CONTRACT Name of requester: FUJIAN FUJING SCIENCE CO., LTD. Effective date: 20091123 |
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Granted publication date: 20061220 Termination date: 20161128 |