CN1028698C - Dual-frequency laser system - Google Patents
Dual-frequency laser system Download PDFInfo
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- CN1028698C CN1028698C CN 93112556 CN93112556A CN1028698C CN 1028698 C CN1028698 C CN 1028698C CN 93112556 CN93112556 CN 93112556 CN 93112556 A CN93112556 A CN 93112556A CN 1028698 C CN1028698 C CN 1028698C
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Abstract
The invention relates to a double-frequency laser system, which is mainly used for the research of communication optical fibers and optically active substances in light chemical engineering and the image processing of satellite transmission pictures, relative phase and displacement, the performance of optical elements and optical film layers, the measurement of precision optics and precision machinery, and the laser power supply of precision instruments and advanced laboratories, and can also form a double-frequency laser array capable of generating double-optical frequency difference of hundreds of megahertz. The laser frequency tuning device mainly comprises a double-frequency laser tube, a permanent magnet assembly capable of adjusting the magnetic induction intensity on the shaft, an analyzer, a photoelectric mixing diode, a preamplifier, a frequency monitoring feedback circuit, a crystal oscillator circuit, a rotatable integrated double-frequency laser tube bracket assembly and a quarter-wave plate frame, and has the advantages that the laser frequency can be tuned along a beat frequency curve, and the laser frequency tuning device is long in service life, and concise and reliable in manufacturing, installation, debugging and maintenance.
Description
The invention belongs to a kind of laser system with double frequence in the laser steady frequency technology field.
The present invention can be used for: the research of (1) communication optical fiber; (2) image processing of satellite transmission photo; (3) accurate measurement of relative phase and displacement; (4) research of optical rotatory substance in the light industry chemical industry; (5) measurement of optical element and optical film performance; (6) precision optics is measured; (7) precision optical machinery is measured; (8) Laser Power Devices of precision instrument and Advanced Concepts Laboratory; (9) form the two-frequency laser array, produce two optical frequency frequency differences of hundreds of megahertz.
Prior art:
1) United States Patent (USP) 3,453,557 have proposed a kind of laser system with double frequence, and it is the Optical Maser System of employing power-balance method Frequency Stabilization Technique, and its employing liquid crystal optical switch element replaces the luminous power of moving the light frequency component in the transmission and moving down the light frequency component and arrives photoelectric apparatus.
The disadvantage of this system is: (1) output laser light frequency is non-tunable; (2) original input is the laser power of direct current, and is unfavorable to the debugging of system; (3) the frequency stabilization working point is the top that is in laser power profile, belongs to the mild area of laser power change.Not only there is distortion in laser power profile itself, and is not easy demonstration directly perceived; (4) need a liquid crystal optical switch element, when lacking the liquid crystal shutter element, then need to adopt the solid crystals switching element to replace, this just needs high voltage source.Movement is difficult to accomplish integrated, and structure is more open.
2) European patent 0,196, and 856 have proposed a dual wavelength helium neon laser system.Adopt outer-cavity structure, in laser cavity, place on the methane box with control and two optical wavelength components of balance.With the end mirror of high voltage drive band piezoelectric ceramic, with the length in modulated laser chamber periodically.
The disadvantage of this system is: the less stable of (1) outer-cavity structure; (2) need high voltage source and piezo ceramic element; (3) methane is volatile liquid, is not suitable for doing permanent optics element.
3) United States Patent (USP) 5,091, and 912 have proposed a laser system with double frequence.This system adopts outer-cavity structure, is mounted with in the laser cavity: the sharp medium of penetrating of (1) sealing; (2) birefringece crystal; (3) quarter-wave plate.Amount to 12 reflectings surface.
The disadvantage of this system is that the reflecting surface in (1) laser cavity is many, so big of loss in the laser cavity and system's levelling difficulty; (2) poor stability of outer-cavity structure; (3) need use high voltage source to remove the end mirror of rotating band piezoelectric ceramic in order to stablize optical frequency; (4) in order to stablize the difference frequency of optical frequency, need remove quarter-wave plate in the rotating drum by stepper motor.
4) United States Patent (USP) 5,091, and 913 have proposed a laser system with double frequence.This system has adopted half outer-cavity structure, includes: the end mirror of (1) band piezoelectric ceramic; (2) birefringence is quartzy dull and stereotyped; (3) Feng Bi the sharp medium of penetrating; (4) outer support shell frame.
The disadvantage of this system is: the poor stability of (1) half outer-cavity structure; (2) need remove the drive pressure electroceramics with high voltage; (2) by the manufacturing process development course explanation of helium neon laser, short with the gas laser life-span that quartzy pipe paste-side face mirror constitutes, be difficult to satisfy the commercial requirement of using the life-span.
The objective of the invention is to overcome weak point in the above-mentioned prior art, invent a kind of laser system with double frequence, it should have the ability of long-term stable operation, and its manufacturing, debugging and maintenance are concisely reliable, and the life-span is long, and the output laser frequency can be tuning.
Description of drawings:
Fig. 1 is the structural representation of laser system with double frequence of the present invention;
Fig. 2 is one of beat frequency curve line style of laser system with double frequence of the present invention;
Fig. 3 be laser system with double frequence of the present invention beat frequency curve line style two;
Fig. 4 is the structural representation of the set of permanent magnets zoarium 1 of magnetic flux density on the adjustable nodal axisn;
Fig. 5 is the beat frequency curve of No.513960 He-Ne double-frequency laser pipe;
Fig. 6 is the beat frequency curve of No.831167 He-Ne double-frequency laser pipe;
Fig. 7 is the structure cross-sectional schematic that is used for the set of permanent magnets zoarium 1 of magnetic flux density on the adjustable nodal axisn of 2.5 megahertz laser system with double frequence;
Fig. 8 is the structure cross-sectional schematic that is used for the set of permanent magnets zoarium 1 of magnetic flux density on the adjustable nodal axisn of 1 megahertz laser system with double frequence;
Fig. 9 is the two-frequency laser array.
The structure of laser system with double frequence of the present invention is shown in Fig. 1. But double-frequency laser pipe 4 places on the central axis in the set of permanent magnets of magnetic induction intensity on the regulating shaft fit 1, that is to say that the central axis of double-frequency laser pipe 4 and the central axis of set of permanent magnets zoarium 1 coincide. The tail light 20 of double-frequency laser pipe 4 arrives photoelectricity mixer diodes 22 through analyzer 21, sends beat signal f by photoelectricity mixer diode 22 and arrives preamplifier 19, enters frequently feedback circuit 18 and from the reference frequency f of crystal oscillating circuit 17 of prison again0Carry out frequency ratio and produce feedback signal, feedback signal control is wrapped in heated filament 2 on the double-frequency laser pipe 4 and the electric current in the heated filament 3, regulates the laser cavity length of double-frequency laser pipe 4 with this, thereby makes beat signal frequency f be stabilized in crystal oscillator reference frequency f0The place. Double-frequency laser pipe 4 has a rotatable integral double-frequency laser tube saddle assemblies 5 to support, and has two upper press rings 6 fixing, and a light 16 of two-frequency laser 4 is by quarter-wave plate 14 outputs.
The output beam of laser system with double frequence comprises two light frequencies, and their frequency difference is 1～2.5 megahertz order of magnitude, and their beat frequency curve has two kinds of substantial linear, is shown in Fig. 2 and Fig. 3 respectively.Beat frequency curve crystal oscillator reference slope of the present invention frequency stabilization is: a crystal oscillator frequency benchmark f is set in the bigger stage casing of the beat frequency slope of curve
0, utilize feedback loop 18 that beat signal frequency f is stabilized in crystal oscillator reference frequency f
0The place, this has just realized the stable of laser light frequency simultaneously.Crystal oscillator reference frequency f
0Be that the frequency stabilization working point can be moved along the beat frequency curve, can be located at the Zuo Banzhi of beat frequency curve or be located at right half, the A on the beat frequency curve 28 as shown in Figure 2, B 2 points; The perhaps A on the beat frequency curve 29 as shown in Figure 3, B 2 points.Thereby laser frequency of the present invention can be carried out tuning along the beat frequency curve.
The set of permanent magnets zoarium 1 of magnetic flux density generally is columnar on the above-mentioned adjustable nodal axisn.Fig. 4 is its concrete structure.Its formation is: cylindrical permanent-magnet body 31 is arranged, and the number of cylindrical permanent-magnet body 31 is placed resistance magnetic spacer ring 32 usually more than 1 between two cylindrical permanent-magnet bodies 31.Resistance magnetic spacer ring 32 is to be made by permeability magnetic material or non-magnet material, and its effect is the magnetic resistance that increases in the magnetic circuit.At the lateral wall of cylindrical permanent-magnet body 31, symmetry is placed with magnetic conduction lath 30, and its effect is the magnetic conductance that increases magnetic circuit.Here it is cold magnetic source of the present invention and as unique magnetic source, thus the thermal environment of double-frequency laser pipe improved greatly.
Double-frequency laser pipe 4 is normally select from long-life commercialization he-ne laser tube, preferably is not with any piezo ceramic element.
The rotatable integral double-frequency laser tube saddle assemblies 5 above-mentioned by carriage 27, that quarter-wave horse 15 and card drum 24 are formed, carriage 27 wherein be by insulation or on-insulated material monolithic process for example epoxy resin and aluminium.Two side strings 7 are arranged in the carriage 27, there are front end tube 9 and rear end tube 26 in carriage 27 two ends, double-frequency laser pipe 4 is settled in inboard at two side strings 7, the front end tube 9 of carriage 27 and rear end tube 26 be placed in respectively with adjustable nodal axisn in the set of permanent magnets zoarium 1 of the magnetic flux density front sleeve 8 and back sleeve 25 that firmly link together, thereby carriage 27 can rotate, and available screw 10 is fixed.Rotatable quarter-wave horse 15 is placed on front end tube 9 outer faces of carriage 27, and card drum 24 is placed on the outer face of rear end tube 26 of carriage 27.
The formation of said quarter-wave horse 15 is: have quarter-wave plate 14 to be installed among the rotating cylinder 12, and it is fixing with pressure ring 13, rotating cylinder 12 is placed among the base 11, can rotate, and available screw is fixed, base 11 is again with the outer end of the front end tube 9 of carriage 27 and be connected the central axes of the central axis of quarter-wave horse 15 and carriage 27.So just can make quarter-wave plate 14 do rotation relatively with respect to double-frequency laser pipe 4.And also can make an integral body with double-frequency laser pipe 4 and rotate, change the The optimal compensation position of two-wire polarised light and level one upright position of two-wire polarised light into to find two circularly polarized lights.
The said card drum 24 that is placed on carriage 27 rear end tubes 26 outer faces is to be processed by insulating material, as organic glass etc.On the card drum 24 several conduits 23 are arranged, electrical lead passes through in conduit 23, and available screw is with lead fixed.Center at card drum 24 towards the direction of tail light 20, is equipped with analyzer 21 and photoelectricity mixer diode 22.
Rotatable integral double-frequency laser tube saddle assemblies 5 has guaranteed that double-frequency laser pipe 4 always is on the central axis of set of permanent magnets zoarium 1 of magnetic flux density on the adjustable nodal axisn, when it rotates, can realize the vertical orientation levelling of level one of two-wire polarised light smoothly, make manufacturing, installation, debugging and the maintenance of laser system with double frequence have simplicity and reliability.
Advantage of the present invention:
(1) the output laser frequency of laser system with double frequence of the present invention can be carried out tuningly under steady optical frequency state along the beat frequency curve, and its tuning scope is exactly the career field of laser single longitudinal mode.Thereby can constitute a two-frequency laser array with the laser system with double frequence of two playscripts with stage directions invention, this array can produce and can carry out two optical frequency frequency differences of the hundreds of megahertz of electronic tuning.
(2) laser system with double frequence of the present invention has long working life, and the starting point working life that it does not need repairing is 10,000 working hours.The acquisition of this advantage is that we have selected for use because of not with the long-life double-frequency laser pipe of piezo ceramic element and the particular design with the set of permanent magnets zoarium of magnetic flux density on the adjustable nodal axisn of joining.
(3) because we have adopted the design of rotatable integral double-frequency laser tube saddle assemblies, and dispose corresponding debugging apparatus, have simplicity and reliability so obtained manufacturing, installation, mode and the maintenance of laser system with double frequence of the present invention.
Embodiment:
Embodiment 1: the structure of laser system with double frequence as shown in Figure 1.Frequency is 2.5 megahertzs, and the set of permanent magnets of induction fit 1 is a cylindrical shape on the adjustable nodal axisn.
The structure of this set of permanent magnets zoarium 1 is shown in Fig. 7.Adopted two cylindrical permanent-magnet bodies 31, it is of a size of Φ 75 * Φ 102 * 64, and used permanent magnetic material is aluminium nickel cobalt LNG37.Adopted a resistance magnetic spacer ring 32, be of a size of Φ 75 * Φ 102 * 8, material therefor is No. 45 steel.Because the resistance magnetic spacer ring 32 of used varying number and the combination of magnetic conduction lath 30, it is different that the axle that is obtained is gone up the variation meeting of the amplitude of magnetic flux density and curve shape, and curve 35,36,37,38 and 39 is exactly to obtain in that different combinations is following among Fig. 7.In the present embodiment, be the more level and smooth curve 39 that the needed axle of 2.5 megahertzs is gone up magnetic flux density for laser system with double frequence can produce frequency, use resistance magnetic spacer ring and 12 magnetic conduction laths of a thick 8mm.Realized the laser system with double frequence of 2.5 megahertzs.
Embodiment 2: laser system with double frequence as shown in Figure 1, its frequency is 1 megahertz.Magnetic flux density set of permanent magnets zoarium 1 still is a cylindrical shape on the adjustable nodal axisn, and concrete structure as shown in Figure 8.
Set of permanent magnets fit 1 adopts 4 cylindrical permanent-magnet bodies 31, and its single Φ 63 * Φ 81 * 24 that is of a size of, used permanent magnetic material are aluminium nickel cobalt LNG13.Adopt three resistance magnetic spacer rings 32, its size is respectively Φ 63 * Φ 81 * 5 and Φ 63 * Φ 81 * 2, and material therefor is No. 45 steel.Adopted the magnetic conduction lath of varying number and size measure in full by 0,1,2,4,6 acquisition curve curve 40,41,42,43,44,45 and 46 as shown in Figure 8, requiring to obtain frequency for laser system with double frequence in the present embodiment is that the curve that the axle of 1 megahertz is gone up magnetic flux density is that curve 44 is the most suitable.
Embodiment 3: the structure of laser system with double frequence as shown in Figure 1, frequency is 2.5 megahertzs, double-frequency laser pipe 4 is the he-ne laser tube of No.513960, its beat frequency curve 33 and working point A are shown in Fig. 5.Magnetic flux density curve 39 shown in having adopted on Fig. 7.Selected the quarter-wave plate 14 of 156.8nm for use.This system has reached following index:
(1) the optical frequency stability 5 * 10
-9/ 24 hours.
(2) two circularly polarized lights are transformed into the isolation 1/60 of two-wire polarised light.
(3) the beat frequency rate drift is 1KHZ/24 hour.
(4) laser power stability degree one thousandth.
With prior art 1:
(1) optical frequency stability ± 2 * 10
-9/ 1 hour.
(2) two circularly polarized lights change the isolation 1/38 of two-wire polarised light.
(3) the beat frequency rate drift is 8.7KHZ/5 hour 20 minutes.
For above-mentioned several comparative descriptions laser system with double frequence frequency stability of the present invention height, life-span length, debugging simply.
The structure of laser system with double frequence still as shown in Figure 1, output frequency is 1 megahertz, the He-Ne double-frequency laser pipe that is numbered No.831167 of double-frequency laser pipe 4, its beat frequency curve 34 is shown in Fig. 6, its working point is the A point, adopted magnetic flux density curve 44 as shown in Figure 8 among this embodiment, obtained frequency stabilization as a result, working life satisfies commercial requirement.
Adopt the laser system with double frequence structure as shown in Figure 1 of two playscripts with stage directions invention, can form the two-frequency laser array.As shown in Figure 9, laser system with double frequence 47 output light frequencies are ν
1, reflex on the partial reflection plate 49 through partial reflection plate 48, enter beat frequency again, in frequency discrimination and the feedback circuit 51; Another laser system with double frequence 52 output light frequencies are ν
2, also enter in beat frequency, frequency discrimination and the feedback circuit 51 ν through partial reflection plate 49
1And ν
2Carry out beat frequency, simultaneously with reference frequency f from reference frequency generator 50
00Compare and produce feedback signal.This array can produce and can carry out two optical frequency frequency differences that electronic tuning obtains the hundreds of megahertz.
Claims (5)
1, a kind of laser system with double frequence, contain double-frequency laser pipe (4), it is characterized in that double-frequency laser pipe (4) places in the set of permanent magnets zoarium (1) of magnetic flux density on the adjustable nodal axisn, and the central axis of the central axis of double-frequency laser pipe (4) and set of permanent magnets zoarium (1) coincides, the tail light (20) of double-frequency laser pipe (4) arrives photoelectricity mixer diode (22) through analyzer (21), send beat signal f and arrive preamplifier (19), enter prison feedback circuit (18) frequently again, with reference frequency f from crystal oscillating circuit (17)
0Carry out frequency ratio and produce feedback signal, feedback signal control is wrapped in heated filament (2) on the double-frequency laser pipe (4) and the electric current in the heated filament (3), double-frequency laser pipe (4) has rotatable integral double-frequency laser tube saddle assemblies (5) to support, and having two upper press rings (6) fixing, a light (16) of double-frequency laser pipe (4) is by quarter-wave plate (14) output.
2, a kind of laser system with double frequence according to claim 1, the set of permanent magnets zoarium (1) that it is characterized in that magnetic flux density on the adjustable nodal axisn has the cylindrical permanent-magnet body (31) more than 1, with permanent magnet (31) fuse have front sleeve (8) and the back sleeve (25), resistance magnetic spacer ring (32) is arranged in the centre of permanent magnet (31), lateral wall in permanent magnet (31), symmetry are equipped with magnetic conduction lath (30).
3, a kind of laser system with double frequence according to claim 1, it is characterized in that rotatable integral double-frequency laser tube saddle assemblies (5) has carriage (27), two side strings (7) are arranged in the carriage (27), there are front end tube (9) and rear end tube (26) in carriage (27) two ends, double-frequency laser pipe (4) is put in inboard at two side strings (7), front end tube (9) outer face of carriage (27) is equipped with rotatable quarter-wave horse (15), rear end tube (26) outer face of carriage (27) is equipped with card drum (24), the front end tube (9) of carriage (27) and rear end tube (26) place the front sleeve (8) and the back sleeve (25) of the set of permanent magnets zoarium (1) of magnetic flux density on the adjustable nodal axisn respectively, thereby carriage (27) can rotate, and also available screw (10) is fixing.
4, a kind of laser system with double frequence according to claim 3, it is characterized in that quarter-wave horse (15) has quarter-wave plate (14) to be contained in the rotating cylinder (12) of quarter-wave horse (15), and there is pressure ring (13) fixing, rotating cylinder (12) places among the base (11), base (11) is connected with the front end tube (9) of carriage (27) again, the central axes of the central axis of quarter-wave horse (15) and carriage (27), quarter-wave plate (14) can be done relative rotation for double-frequency laser pipe (4), perhaps does whole rotation with double-frequency laser pipe (4).
5, a kind of laser system with double frequence according to claim 3, it is characterized in that several conduits (23) are arranged on the card drum (24), electric lead passes through in conduit, and can fix, the center of card drum (24), and be equipped with analyzer (21) and photoelectricity mixer diode (22) to the direction of tail light (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112556 CN1028698C (en) | 1993-09-14 | 1993-09-14 | Dual-frequency laser system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93112556 CN1028698C (en) | 1993-09-14 | 1993-09-14 | Dual-frequency laser system |
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| Publication Number | Publication Date |
|---|---|
| CN1089763A CN1089763A (en) | 1994-07-20 |
| CN1028698C true CN1028698C (en) | 1995-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93112556 Expired - Fee Related CN1028698C (en) | 1993-09-14 | 1993-09-14 | Dual-frequency laser system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100386930C (en) * | 2005-03-04 | 2008-05-07 | 清华大学 | HeNe laser device capable of outputting two beams of vertically polarized light with stabilized intensity |
| CN103904541B (en) * | 2012-12-28 | 2017-05-31 | 上海微电子装备有限公司 | Dual-Frequency Zeeman Laser |
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1993
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|---|---|
| CN1089763A (en) | 1994-07-20 |
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