CN1016916B - Dual-isotope zeeman laser and its freq-stabilizing method - Google Patents
Dual-isotope zeeman laser and its freq-stabilizing methodInfo
- Publication number
- CN1016916B CN1016916B CN 88106443 CN88106443A CN1016916B CN 1016916 B CN1016916 B CN 1016916B CN 88106443 CN88106443 CN 88106443 CN 88106443 A CN88106443 A CN 88106443A CN 1016916 B CN1016916 B CN 1016916B
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- Prior art keywords
- frequency
- isotope
- dual
- laser
- zeeman laser
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- 238000000034 method Methods 0.000 title abstract description 13
- 230000035559 beat frequency Effects 0.000 claims abstract description 53
- 239000000919 ceramic Substances 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 230000010287 polarization Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000004904 shortening Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract 1
- 238000005459 micromachining Methods 0.000 abstract 1
- 230000003595 spectral effect Effects 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 description 17
- 238000011105 stabilization Methods 0.000 description 17
- 230000004907 flux Effects 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005317 semiclassical theory Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Lasers (AREA)
Abstract
The present invention relates to a dual-isotope zeeman laser and a frequency-stabilizing method, which belongs to the laser frequency-stabilizing technique. In the present invention, a dual-isotope gaining-media laser is adopted to make a beat-frequency value of a spectral line raised, the beat-frequency value of beat-frequency maximization of the frequency-stabilizing zeeman laser can reach 1.2 to 1.5 MHz, and other indexes also satisfy the requirements of a zeeman laser measurement system. The present invention can be used for positioning control of working tables, such as super-machining equipment, micro-machining equipment, etc., and accurate measurement of general geometric sense.
Description
The invention belongs to laser frequency stabilization technology.
The zeeman laser measuring system has obtained to use widely in accurate measurements such as microfabrication equipment and geometric sense and form error, vertically the frequency stabilization zeeman laser is the core component of zeeman laser measuring system, for satisfying the requirement of measuring system, vertically the frequency stabilization zeeman laser should satisfy following requirement: frequency stability and wavelength reproducibility are better than 10
-8Magnitude, the beat frequency value reaches about 1.5MHz, and the beating wave momentum is less than 10KHz.
1967, L.S.Culter has invented the vertical single isotope zeeman laser of beat frequency extreme value frequency stabilization, its basic principle is, under the certain situation of magnetic flux density, the beat frequency value of zeeman laser changes with laser chamber is tuning, obtain extreme value corresponding to core place beat frequency, with electronic servo with the beat frequency value stabilization of zeeman laser on extreme point, just can make optical frequency be stabilized in core, Fig. 1 is the beat frequency curve of this list isotope zeeman laser, curvilinear trend can be found out from Fig. 1, when the beat frequency extreme value reaches 0.8MHz, the beat frequency curve tends towards stability, and when the beat frequency extreme value reached the 1.0MHz left and right sides, two minimum peaks and a very big peak appearred in the beat frequency curve, and curve is more mild, curve means that gently precision frequency stabilization descends even the frequency stabilization failure, so the getable beat frequency value of this invention is no more than 0.8MHz and actual needs differs greatly.
T.Baer was in 1980, China National Measuring Science Research Inst. was in 1984, Mark.A.Zumberge succeeded in developing separately the vertical single isotope zeeman laser of frequency stabilization in 1985 in succession according to identical principle, the beat frequency value has not all been passed through the history in more than 20 year above this invention of 0.8MHz.L.s.Cubter, and constantly there is the people that it is improved, but fail to be applied to the zeeman laser measuring system, reason just is that the beat frequency value is too low always.
In order to improve the beat frequency value, detailed research has been done to single isotope zeeman laser beat frequency curve by china institute of metrology time-frequency place, the result proves that the beat frequency value of beat frequency extreme value frequency stabilization zeeman laser is difficult to bring up to practical size, thereby abandoned this method, a kind of beat frequency locking frequency-stabilizing method has been proposed, with reference to figure 2, this method is to utilize servo system that the beat frequency value is locked in extraneous reference signal △ f
0On, thereby make the beat frequency value from △ f
1Bring up to △ f
0A fatal shortcoming of this method is when magnetic flux density or Q value change, and will cause the longitudinal drift and the change of shape of beat frequency curve, causes optical frequency from u
AFloat to u
B, make frequency long-term stability and wavelength reproducibility descend.
The objective of the invention is in order to overcome the shortcoming of above-mentioned various frequency stabilization zeeman lasers, a kind of beat frequency extreme value frequency stabilization zeeman laser of practicality is provided, improve the beat frequency value of zeeman laser, to satisfy the actual requirement of accurate measurement.
The invention provides the vertical zeeman laser of a kind of novel beat frequency extreme value frequency stabilization, by the full inner chamber laser spectrum of the interior He-Ne of filling mist shake chamber (6), be added in the piezoelectric ceramic (7) on the one end housing, thermal conditioning coil (9) and the outside Longitudinal Magnetic-field Has around the chamber outside formed, and it is characterized in that the interior Ne gas of resonant cavity is Ne
20, Ne
22The dual-isotope mist.The present invention designs a kind of beat frequency extreme value frequency-stabilizing method, it is characterized in that adopting He-Ne dual-isotope zeeman laser, spectroscope (10), polarization splitting prism (11), receiver (12), forward-backward counter (13), D/A change-over circuit (14), clock circuit (15), PZT servo circuit (16) and hot servo circuit (17) to constitute.
The result of calculation of classical theory and semiclassical theory shows, the shape of beat frequency curve and beat frequency extreme value are not only relevant with the size of magnetic flux density, also relevant with the gain curve width of laser gain medium, under identical magnetic flux density condition, the gain curve width is big more, the beat frequency extreme value is big more, and the effective ways of raising gain curve width are used dual-isotope Ne exactly
20, Ne
22Gain media replaces single isotope gain media.Aforementioned calculation result has obtained experimental verification, Fig. 3 is the beat frequency curve of dual-isotope gain media zeeman laser provided by the invention, the beat frequency curve shape of this sets of curves and Fig. 1 list isotope gain media zeeman laser is just the opposite, under the same magnetic flux density, core place beat frequency value is significantly increased than Fig. 1.As seen from Figure 3, some is the convex curves with sharp-pointed protruding peak for the beat frequency curve of the sharp device of dual-isotope gain media Zeeman, beat frequency maximum can reach 1.2～1.6MHz, adopt dual-isotope gain media laser to replace single isotope gain media laser, beat frequency extreme value frequency stabilization zeeman laser beat frequency value can reach the practical size that requires, and this has just solved beat frequency extreme value frequency stabilization zeeman laser from inventing unsolved always problem over more than 20 year.
Brief Description Of Drawings:
Fig. 1 is the single isotope zeeman laser beat frequency curve in the prior art.
Fig. 2 is beat frequency lock method frequency stabilization point and drift thereof.
Fig. 3 is a dual-isotope zeeman laser beat frequency curve provided by the invention.
Fig. 4 is a beat frequency extreme value frequency-stabilizing method embodiment block diagram provided by the invention.
The most preferred embodiment of dual-isotope frequency stabilization zeeman laser provided by the invention is: resonant cavity length is in 150mm, to guarantee the operation of laser single mode.For guaranteeing the symmetry of gain curve and beat frequency curve, Ne
20The available proportion of gas is (53 ± 5) % that accounts for Ne gas, and the optimum mixture ratio example of dual-isotope is Ne
20: Ne
22=53: 47, convenient for ventilating control, also can adopt equal proportion to mix, i.e. Ne
20: Ne
22=1: 1.
Beat frequency extreme value frequency-stabilizing method embodiment provided by the invention as shown in Figure 4, the key of this method is to obtain the first derivative of beat frequency curve.Its operation principle is described below: clock circuit (15) output 30Hz standard square wave, be used to control the sampling of the plus-minus and the D/A change-over circuit (14) of forward-backward counter (13), and the modulation of laser frequency, with two pairs of semicircle hard glass rings (8) piezoelectric ceramic (7) is fixed on the shell of laserresonator (6), the 30Hz square wave is added on the piezoelectric ceramic through PZT servo circuit (16) amplification, flexible resonant cavity is to realize the modulation to laser frequency, between the low period of square wave, counter adds counting; Between the high period of square wave, counter subtracts counting, and through behind the one-period, the first derivative of certain point is directly proportional on the remainder in the counter and the beat frequency curve, if beat frequency is obtained extreme value, then this moment, first derivative was zero, and remainder also is zero in the counter.D/A change-over circuit (14) is born positive analog quantity according to positive and negative being converted into of remainder in the counter, PZT servo circuit (16) and hot servo circuit (17) amplify this analog quantity, export piezoelectric ceramic (7) and heater coil (9) to, shortening or extending laserresonator remainder in counter is zero, beat frequency is obtained extreme value, and optical frequency is stabilized in core.
By the dual-isotope frequency stabilization zeeman laser that this embodiment forms, its beat frequency value reaches 1.5MHz, and the beat frequency stability reaches 10
-3, frequency stability reaches 2 * 10
-8, the wavelength reproducibility reaches 3 * 10
-8(3 σ) satisfied the requirement of actual accurate measurement, is characterized in that frequency stability and wavelength reproducibility are not subjected to the influence of factors vary such as magnetic flux density and Q value, and error component is few, easily reaches degree of precision.
Claims (5)
1, the vertical zeeman laser of a kind of He-Ne, by the full inner chamber laserresonator (6) of the interior He-Ne of filling mist, be added in the piezoelectric ceramic (7) on the one end housing, thermal conditioning coil (9) and the outside Longitudinal Magnetic-field Has outside the chamber formed, and it is characterized in that Ne gas is Ne in the resonant cavity
20, Ne
22The dual-isotope mist.
2,, it is characterized in that the dual-isotope gas Ne that is filled as the said zeeman laser of claim 1
20Inflation ratio usable range be (53 ± 5) % that accounts for Ne gas.
3,, it is characterized in that it is Ne that the dual-isotope gas ratio fills in institute as the said zeeman laser of claim 2
20: Ne
22=53: 47.
4,, it is characterized in that it is Ne that the dual-isotope gas ratio fills in institute as the said zeeman laser of claim 2
20: Ne
22=1: 1.
5, a kind of beat frequency extreme value Frequency Stabilized Lasers system, it is characterized in that adopting as claim 1 said Ne-Ne dual-isotope zeeman laser and spectroscope (10), polarization splitting prism (11), receiver (12), forward-backward counter (13), D/A change-over circuit (14), clock circuit (15), PZT servo circuit (16) and hot servo circuit (17) constitute, said clock circuit (15) outputting standard square wave, be used to control said forward-backward counter (13) and the sampling of D/A change-over circuit (14) and the modulation of laser frequency, between the low period of this square wave, counter adds counting, between the high period of square wave, counter subtracts counting, and said D/A change-over circuit is born positive analog quantity according to positive and negative being converted into of remainder in the counter.Said PZT servo circuit and hot servo circuit amplify this analog quantity, and exporting the shortening of piezoelectric ceramic and heater coil to or extending laserresonator remainder in counter is zero, and beat frequency is obtained extreme value, and optical frequency is stabilized in core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106443 CN1016916B (en) | 1988-09-08 | 1988-09-08 | Dual-isotope zeeman laser and its freq-stabilizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88106443 CN1016916B (en) | 1988-09-08 | 1988-09-08 | Dual-isotope zeeman laser and its freq-stabilizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1041068A CN1041068A (en) | 1990-04-04 |
| CN1016916B true CN1016916B (en) | 1992-06-03 |
Family
ID=4834248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88106443 Expired CN1016916B (en) | 1988-09-08 | 1988-09-08 | Dual-isotope zeeman laser and its freq-stabilizing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1016916B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1871149B1 (en) * | 2006-06-22 | 2011-08-03 | Sony Deutschland Gmbh | Zeeman-slower, coil for a Zeeman-slower device and method for cooling an atom beam |
| CN101593933B (en) * | 2009-06-19 | 2010-10-20 | 中国科学院上海光学精密机械研究所 | Saturation absorption frequency discriminator |
-
1988
- 1988-09-08 CN CN 88106443 patent/CN1016916B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN1041068A (en) | 1990-04-04 |
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