CN202772420U - Laser device used in magneto-optical trap - Google Patents
Laser device used in magneto-optical trap Download PDFInfo
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- CN202772420U CN202772420U CN 201220315100 CN201220315100U CN202772420U CN 202772420 U CN202772420 U CN 202772420U CN 201220315100 CN201220315100 CN 201220315100 CN 201220315100 U CN201220315100 U CN 201220315100U CN 202772420 U CN202772420 U CN 202772420U
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Abstract
The utility model discloses a laser device used in a magneto-optical trap, and belongs to the technical field of lasers. The device comprises a light source main body which comprises a semiconductor laser tube, a collimating lens, a diffraction grating, and a reflector. The device also comprises a piezo ceramic actuator used to adjust frequency of output signals of the light source main body, a passive cavity through which laser output by the light source main body passes, a first photoelectric detection unit used to detect intensity of the laser passes the passive cavity and generate a first photoelectric detection signal, a second photoelectric detection unit used to detect intensity of the laser output by the light source main body and generate a second photoelectric detection signal, and a servo unit used to output a first voltage controlled signal to the piezo ceramic actuator according to the first photoelectric detection signal output by the first photoelectric detection unit and the second photoelectric detection signal output by the second photoelectric detection unit. Stability of output signal frequency of the laser device used in the magneto-optical trap is high, and the laser device used in the magneto-optical trap can satisfy requirement of high-precision equipment.
Description
Technical field
The utility model relates to the laser technique field, particularly a kind of Magneto-Optical Trap laser aid.
Background technology
Magneto-Optical Trap is a kind of effective means of imprisoning neutral atom, uses very extensive in fields such as Physics of Cold Atoms experiment, quantum optices and quantum informations.In order to guarantee to be slowed down (cooling) when atom in the Magneto-Optical Trap is with the operation of any one initial velocity direction, usually can adopt at three dimensions atom cooling facing each other in the Magneto-Optical Trap and imprison light source.
Existing atom cooling imprison light source adopts the laser of Littrow structure usually, and this laser generally includes semiconductor laser tube, collimating lens, diffraction grating and speculum.The laser that semiconductor laser tube is sent is behind the collimating lens collimation, be incident on the diffraction grating, first-order diffraction light and the incident light conllinear of diffraction grating oppositely turn back in the semiconductor laser tube along former road, and the Zero-order diffractive of diffraction grating or mirror reverberation are as the output of output light.In the laser of this structure, optical maser wavelength or frequency tuning is by rotating diffraction grating, changes that diffraction grating realizes the incident of light and the angle of diffraction.In the process of rotating shutter, also will change as the catoptrical direction of grating mirror of exporting light thereupon.For the direction of eliminating output beam changes, people have adopted the additional speculum parallel with diffraction grating.
In realizing process of the present utility model, the inventor finds that there is following problem at least in prior art:
Existing atom cooling imprison light source easily is subject to the impact of external environment, thereby causes the variation of its output frequency, and for for high accuracy equipment such as the exigent gravity gradiometers of frequency stability, existing cooling imprison light source can not meet the demands.
The utility model content
For the output frequency stability that solves laser of the prior art is inadequate, can not satisfy the problem of high precision apparatus demand, the utility model embodiment provides a kind of Magneto-Optical Trap laser aid.Described technical scheme is as follows:
The utility model embodiment provides a kind of Magneto-Optical Trap laser aid, and described device comprises: light source body, and described light source body comprises semiconductor laser tube, collimating lens, diffraction grating and speculum; Described device also comprises: for the piezoelectric crystal driver of the output signal frequency of adjusting described light source body, the passive cavity that the laser of exporting for the described light source body of confession passes through, for detection of the intensity of the laser that sees through described passive cavity and produce the first photodetector unit of the first light inspection signal, for detection of the intensity of the laser of described light source body output and produce the second photodetector unit of the second light inspection signal, be used for exporting the first voltage-controlled signal to the servo unit of described piezoelectric crystal driver according to the first light inspection signal of described the first photodetector unit output and the second light inspection signal of described the second photodetector unit output, wherein, described servo unit respectively with described the first photodetector unit, described the second photodetector unit be connected the piezoelectric crystal actuator electrical and connect.
Preferably, described servo unit comprises: operational amplifier, be used for the first light inspection signal of described the first photodetector unit output and the second light inspection signal of described the second photodetector unit output are implemented differential amplification, and adopt default slope adjustment level that the differential amplification result is compensated, to export the described first voltage-controlled signal.
Preferably, described device also comprises: for detection of the intensity of the laser that sees through described passive cavity and produce the 3rd photodetector unit of the 3rd light inspection signal, modulation signal generator for generation of synchronous reference signal and modulation signal, be used for adopting described synchronous reference signal that the 3rd light inspection signal of described the 3rd photodetector unit output is carried out phase sensitive detection and exports the second voltage-controlled signal to the phase detection unit of described piezoelectric crystal driver, described modulation phase detection unit respectively with described the 3rd photodetector unit, described modulation signal generator be connected the piezoelectric crystal actuator electrical and connect, described modulation signal generator also is connected with described piezoelectric crystal actuator electrical.
Further, described device also comprises: be used for the modulation signal of described modulation signal generator output is carried out first three frequency division, put on the frequency divider of described piezoelectric crystal driver, described modulation signal generator is connected with described piezoelectric crystal actuator electrical by described frequency divider again.
Particularly, described the first photodetector unit, described the second photodetector unit and described the 3rd photodetector unit are photomultiplier.
The beneficial effect that the technical scheme that the utility model embodiment provides is brought is: the signal that obtains behind passive cavity by the output signal to the output signal frequency of light source body and same light source main body carries out the frequency frequency discrimination, obtain the corresponding first voltage-controlled signal feedback to light source body, its output frequency is changed, thereby improve the stability of its output frequency, satisfy the requirement of high precision apparatus.
Description of drawings
In order to be illustrated more clearly in the technical scheme among the utility model embodiment, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the Magneto-Optical Trap that provides of the utility model embodiment 1 with the structural representation of laser aid.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model execution mode is described in further detail.
The utility model embodiment provides a kind of Magneto-Optical Trap laser aid, and referring to Fig. 1, this device comprises: light source body 1, passive cavity 2, the first photodetector unit 3, the second photodetector unit 4, servo unit 5.
Wherein, light source body 1 adopts the laser of Littrow structure, the piezoelectric crystal driver 1a that it comprises semiconductor laser tube, collimating lens, diffraction grating, speculum and is used for the output signal frequency of light source body.Its concrete structure is known for those skilled in the art, omits at this and describes in detail.This piezoelectric crystal driver 1a can be the piezoelectric ceramic piece that speculum is installed, because its electrostrictive properties when being applied in different voltage at it, can make the chamber long hair give birth to change, thereby cause the variation of light source output frequency.
Particularly, passive cavity is a metal spiral cavity, is used for the laser signal of input is carried out frequency-selecting output.Preferably, diffraction grating and speculum can be installed on the same panel, adopt this integral type design, in the time of can avoiding diffraction grating and speculum to be installed separately, and the unsteadiness of the output frequency of the light source that mechanical instability causes.
Wherein, servo unit 5 is electrically connected with the first photodetector unit 3, the second photodetector unit 4 and piezoelectric crystal driver 1a respectively.After the laser that light source body 2 is sent saw through passive cavity 2, the first photodetector unit 3 detected the intensity of this laser that sees through passive cavity 2 and produces the first light inspection signal; The second photodetector unit 4 is for detection of the intensity of the laser of light source body 1 output and produce the second light inspection signal; Servo unit 5 is used for the second light inspection signal according to the first light inspection signal of the first photodetector unit 3 outputs and 4 outputs of the second photodetector unit, export the first voltage-controlled signal to piezoelectric crystal driver 1a, thereby output signal frequency that can locked light main body 2 improves its short-term stability.
Preferably, in the present embodiment, servo unit 5 adopts operational amplifier, be used for the first light inspection signal of the first photodetector unit 3 outputs and the second light inspection signal of the second photodetector unit 4 outputs are implemented differential amplification, and adopt default slope adjustment level that the differential amplification result is compensated, to export the first voltage-controlled signal.For a certain light source body, by selecting suitable slope adjustment level, the chamber resonance frequency slope of a curve maximum (shown in fk among Fig. 2) that the signal frequency of this light source body output can be locked in passive cavity 2 is located.That is to say, when the signal frequency f=fk of light source body 1 output, the voltage of the first voltage-controlled signal of servo unit output is 0, and when the signal frequency f of light source body 1 output＞fk(f＜fk), the voltage of the first voltage-controlled signal is reverse negative (just) value DC level, finally makes the light source body output frequency be locked in f=fk.Because this slope maximum fk is away from the centre frequency of passive cavity, this place's decentre frequency is far away, and the frequency unicity is good, so the light source body output frequency is locked in the f=fk place, can further improve the stability of the output signal frequency of light source body.
Particularly, the size of this slope adjustment level can be determined according to chamber resonance frequency curve, under open loop mode, the scan laser output frequency, detection laser, can obtain a correction level and act on piezoelectric crystal on the basis of existing servo circuit by the light intensity magnitude behind the passive cavity.In the existing servo techniques, when laser frequency is aimed at the passive cavity centre frequency, behind servo circuit, will obtain 0 level, and can not cause that the piezoelectric crystal driver will change.The adjusting level of introducing in this patent is produced by an A/D, when laser frequency is aimed at spectral line slope maximum of points, to obtain one behind traditional servo circuit is not 0 level, this patent adds at this moment an operational amplifier and works in difference modes, the DC level that produces with A/D just now is not that 0 level compensates with the generation of traditional servo circuit, is output as 0 level thereby finally make.Obviously when laser frequency was positioned at the passive cavity centre frequency, traditional servo circuit was output as 0, and the output of this patent servo circuit this moment is not 0.
Easily know, also the output frequency of light source body can be locked on the centre frequency of passive cavity, this knows for those skilled in the art, omits at this and describes in detail.
Preferably, the device of the present embodiment also comprises: the 3rd photodetector unit 6, modulation signal generator 7 and detection unit 8 mutually.Wherein, modulation signal generator 7 is electrically connected with phase detection unit 8 and piezoelectric crystal driver 1a respectively; Phase detection unit 8 is electrically connected with the 3rd photodetector unit 6 and piezoelectric crystal driver 1a respectively.The 3rd photodetector unit 6 is for detection of the intensity of the laser that sees through passive cavity 2 and produce the 3rd light inspection signal; Modulation signal generator 7 is for generation of synchronous reference signal and modulation signal; Phase detection unit 8 is used for adopting synchronous reference signal that the 3rd light inspection signal of the 3rd photodetector unit output is carried out phase sensitive detection, and export the second voltage-controlled signal to described piezoelectric crystal driver 1a, thereby cause the variation of light source output frequency, improve the long-term stability of the output signal frequency of light source body.
Preferably, the device of the present embodiment also comprises frequency divider 9, this frequency divider 9 is connected between modulation signal generator 7 and the piezoelectric crystal driver 1a, is used for the modulation signal of modulation signal generator 7 outputs is carried out first three frequency division, puts on piezoelectric crystal driver 7 again.
Particularly, the first photodetector unit 3, the second photodetector unit 4 and the 3rd photodetector unit 6 all can adopt photomultiplier.Easily know, in specific implementation, the first photodetector unit 3 and the 3rd photodetector unit 6 can adopt same parts.
The utility model embodiment carries out the frequency frequency discrimination by the signal that the output signal to the output signal frequency of light source body and same light source main body obtains behind passive cavity, obtain the corresponding first voltage-controlled signal feedback to light source body, its output frequency is changed, thereby improve the stability of its output frequency, satisfy the requirement of high precision apparatus.
The all or part of step that one of ordinary skill in the art will appreciate that realization above-described embodiment can be finished by hardware, also can come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The above only is preferred embodiment of the present utility model, and is in order to limit the utility model, not all within spirit of the present utility model and principle, any modification of doing, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. Magneto-Optical Trap laser aid, described device comprises light source body, and described light source body comprises semiconductor laser tube, collimating lens, diffraction grating and speculum, it is characterized in that, and described device also comprises:
Piezoelectric crystal driver for the output signal frequency of adjusting described light source body, the passive cavity that the laser of exporting for the described light source body of confession passes through, for detection of the intensity of the laser that sees through described passive cavity and produce the first photodetector unit of the first light inspection signal, for detection of the intensity of the laser of described light source body output and produce the second photodetector unit of the second light inspection signal, be used for exporting the first voltage-controlled signal to the servo unit of described piezoelectric crystal driver according to the first light inspection signal of described the first photodetector unit output and the second light inspection signal of described the second photodetector unit output;
Wherein, described servo unit is connected with described the first photodetector unit, described the second photodetector unit and the piezoelectric crystal actuator electrical of being connected respectively.
2. device according to claim 1 is characterized in that, described servo unit comprises:
Operational amplifier, be used for the first light inspection signal of described the first photodetector unit output and the second light inspection signal of described the second photodetector unit output are implemented differential amplification, and adopt default slope adjustment level that the differential amplification result is compensated, to export the described first voltage-controlled signal.
3. device according to claim 1 is characterized in that, described device also comprises:
For detection of the intensity of the laser that sees through described passive cavity and produce the 3rd photodetector unit of the 3rd light inspection signal, modulation signal generator for generation of synchronous reference signal and modulation signal, be used for adopting described synchronous reference signal that the 3rd light inspection signal of described the 3rd photodetector unit output is carried out phase sensitive detection and exports the second voltage-controlled signal to the phase detection unit of described piezoelectric crystal driver, described modulation phase detection unit respectively with described the 3rd photodetector unit, described modulation signal generator be connected the piezoelectric crystal actuator electrical and connect, described modulation signal generator also is connected with described piezoelectric crystal actuator electrical.
4. device according to claim 3 is characterized in that, described device also comprises:
Be used for the modulation signal of described modulation signal generator output is carried out first three frequency division, put on the frequency divider of described piezoelectric crystal driver again, described modulation signal generator is connected with described piezoelectric crystal actuator electrical by described frequency divider.
5. device according to claim 3 is characterized in that, described the first photodetector unit, described the second photodetector unit and described the 3rd photodetector unit are photomultiplier.
6. device according to claim 1 is characterized in that, described diffraction grating and described speculum are installed on the same panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220315100 CN202772420U (en) | 2012-07-02 | 2012-07-02 | Laser device used in magneto-optical trap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220315100 CN202772420U (en) | 2012-07-02 | 2012-07-02 | Laser device used in magneto-optical trap |
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| CN202772420U true CN202772420U (en) | 2013-03-06 |
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| CN 201220315100 Expired - Fee Related CN202772420U (en) | 2012-07-02 | 2012-07-02 | Laser device used in magneto-optical trap |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769250A (en) * | 2012-07-02 | 2012-11-07 | 中国科学院武汉物理与数学研究所 | Atom cooling and trapping light source device |
-
2012
- 2012-07-02 CN CN 201220315100 patent/CN202772420U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769250A (en) * | 2012-07-02 | 2012-11-07 | 中国科学院武汉物理与数学研究所 | Atom cooling and trapping light source device |
| CN102769250B (en) * | 2012-07-02 | 2014-07-23 | 中国科学院武汉物理与数学研究所 | Atom cooling and trapping light source device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130306 Termination date: 20140702 |
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| EXPY | Termination of patent right or utility model |