CN105514799A - Small no-background saturated absorption spectroscopy device and system and control method - Google Patents
Small no-background saturated absorption spectroscopy device and system and control method Download PDFInfo
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- CN105514799A CN105514799A CN201610059277.0A CN201610059277A CN105514799A CN 105514799 A CN105514799 A CN 105514799A CN 201610059277 A CN201610059277 A CN 201610059277A CN 105514799 A CN105514799 A CN 105514799A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
- H01S5/0687—Stabilising the frequency of the laser
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Abstract
The invention discloses a small no-background saturated absorption spectroscopy device and system and a control method. A prism is adopted, Doppler absorption spectra are excited by pump light through an atom air chamber, light comes out and then irradiates on the incident plane of the prism to form first detection light, the first detection light and the pump light are in opposite directions and located on the same line, the first detection light is reflected through a first reflection surface and a second reflection surface to form second detection light to enter the atom air chamber, and subtraction is conducted on the first detection light and the second detection light which come out of the atom air chamber to form no-background saturated absorption spectra. The problem that an original mechanical structure is complicated and large is solved, the light path structure is simplified, and the whole small Doppler no-background saturated absorption spectroscopy device can be integrated in a box with the dimension of 30 mm*50 mm*20 mm; meanwhile, due to the fact that the mechanical structure is simple, tuning of the light path is convenient, mechanical stability is improved greatly, and then the application range is wider.
Description
Technical field
The invention belongs to photoelectron technical field, be specifically related to a kind of small-sized without background saturation-absorption spectrum device and system thereof and control method for laser frequency stabilization.
Background technology
Along with the development of semiconductor laser technology, the forward position scientific research field such as semiconductor laser has been widely used in accurate measurement, laser cooling, optical fiber communication, laser spectroscopy, quantum frequency standards, captures, laser acquisition.The Frequency Stabilization Technique of laser is the core technology of semiconductor laser.
Conventional frequency stabilization of semiconductor laser scheme is the saturation-absorption spectrum utilizing atom or molecule, by the Frequency Locking of laser on the transition spectral line of the hyperfine energy level of atom or the vibrational-rotational level spectral line of molecule.Resonance frequency stability due to atom and molecule is better than the frequency stability that laser freely operates, and this method can improve the frequency stability of laser.As shown in Figure 1, when the laser of a branch of frequency scanning is as detecting light B through atomic air chamber, because atomic gas has VELOCITY DISTRIBUTION, the atom of friction speed is experienced and to be obtained laser frequency difference, and the absorption spectrum of atom pair laser exists Doppler broadening; When with frequently, pump light A that intensity is higher closes bundle in space with detection light B, and when direction is contrary, spectral signal occurred multiple transmission peaks.Reason is: for detection light direction on speed be the atom of zero, when pump light resonates with the same hyperfine levels transition detecting light and atom, strong pump light makes atom reduce at the population of ground state, and the absorption of the detection light of atom weakens, and creates the transmission peaks without Doppler's background; For speed on detection light direction be
(wherein c is the light velocity, v
i, v
jbe respectively i-th, a j hyperfine levels transition resonance frequency, v
0be laser center frequency, i and j is natural number) atom, when pump light and detection light frequency be v
iand v
jtime, pump light and i-th hyperfine levels transition resonate, and detection light and a jth hyperfine levels transition resonate, and also can produce the transmission peaks without Doppler's background, absorb background and the transmission peaks without Doppler effect in spectral signal now containing Doppler; When with another bundle detection light C by atomic air chamber, the spectral signal now detecting light C absorbs background signal for Doppler, the signal subtractions that two bundles detect light obtain without background without background saturation-absorption spectrum.
In the field such as the experiment of space cold atom, quantum frequency standards and accurate measurement, there is very high requirement to the volume of frequency stabilized carbon dioxide laser and vibration resistance, usually need to simplify as much as possible mechanical structure, to meet the requirement of resistance to overturning.Fig. 2 describes saturation-absorption spectrum device general at present.
Existing without background saturation-absorption spectrum device as shown in Figure 2, optical fiber coupling head 01 seed injection source is to flat heavy sheet glass sheet 02, reflect respectively in front and rear surfaces through heavy sheet glass sheet, produce two bundles reverberation B and C and through Beam A (the strength ratio A:B:C=23:1:1 of reverberation and transmitted light), wherein two bundle reverberation B and reverberation C incide in difference photodetector 05 through air chamber 03 and five or five points of optical frequency sheets 04; And transmitted light A overlaps with reverberation B in space after twice 45 degree of speculums 06 and 07 and 55 point of optical frequency sheet 04 reflect, reverberation B creates saturation-absorption spectrum signal, reverberation C creates absorption spectrum signal, obtains the saturation-absorption spectrum signal without Doppler's background after two signal differentials.
But existing this device is regulated by two speculums, has four degrees of freedom, be difficult to regulate; Further, the distance between reverberation B and reverberation C is determined by the thickness of heavy sheet glass sheet, increase the distance between utilizing emitted light B and reverberation C, must increase the thickness of back glass sheet; Meanwhile, existing this device overall volume is very large.
Summary of the invention
For high stability and the miniaturized technical need of frequency stabilized carbon dioxide laser, the present invention proposes a kind of small-sized without background saturation-absorption spectrum device and system thereof and control method, achieve the saturation-absorption spectrum without Doppler's background, and make the volume of device be reduced to 50% of existing apparatus.Because the present invention needs the mechanical structure of adjustment less, so its stability and reliability increase greatly.
It is small-sized without background saturation-absorption spectrum device that one object of the present invention is to propose one.
Of the present inventionly small-sizedly to comprise without background saturation-absorption spectrum device: seed light source, spectroscope, atomic air chamber, the first prism, the first and second photodetectors; Wherein, the maximum drift angle of the first prism is the first drift angle, the side relative with the first drift angle is the plane of incidence, the side on the first drift angle both sides is respectively the first reflecting surface and the second reflecting surface, the plane of incidence is the high transmission plane of low reflection, first reflecting surface is the low transmission plane of high reverse--bias, and the second reflecting surface is the high transmission plane of low reflection; The seed light that seed light source sends is after spectroscope, and a part transmits as key light, and another part light enters atomic air chamber as pump light, and excited atom absorbs the absorption spectrum being formed and have Doppler broadening; Pump light, after atomic air chamber outgoing, is incident to the plane of incidence of the first prism; By regulating the angle of pitch and the angle of the first prism, make pump light vertical with the plane of incidence; After the plane of incidence of the high transmission of low reflection, fraction light as the first detection light, returns atomic air chamber through plane of incidence reflection, oppositely collinear with pump light, produces the absorption spectrum with multiple transmission peaks; Major part light enters the first prism through plane of incidence transmission, after the first reflective surface of the low transmission of high reverse--bias, again after the second reflective surface, transmit the first prism from the plane of incidence, enter atomic air chamber as the second detection light, produce Doppler broadening spectrum; The first detection light after atomic air chamber and the second detection light are respectively by the first photodetector and the second photoelectric detector, what wherein the first detection light produced is the saturation-absorption spectrum signal containing Doppler broadening, second detection light creates containing Doppler broadening spectral signal, after subtracter, formed without background saturation-absorption spectrum.
First prism is transparent material, and the surface of the first reflecting surface is coated with high-reflecting film, forms the low transmission plane of high reverse--bias; Second reflecting surface and the plane of incidence do not process, and form the high transmission plane of low reflection.
Pump light is after plane of incidence reflection, as the first detection light, first detection light and pump light is natural coincides with a bit, therefore the angle of pitch and the angle of adjustment first prism is only needed, pump light and first just can be regulated to detect light overlap, therefore only have the degree of freedom of two dimensions, significantly reduce adjustment difficulty.
Pump light reflects to form the first detection light through the plane of incidence, after the first reflecting surface and the second reflective surface, the second detection light is formed respectively after transmission, by the distance between the straight line that regulates the high place of the first drift angle of pump light and the first prism, the first detection light and second can accurately and be easily regulated to detect distance between light.
First drift angle is between 80 ~ 100 °.
Spectroscope can adopt light splitting piece, and the seed light sent from seed light source is after light splitting piece, and a part of transmission exports as key light, and another part enters atomic air chamber as pump light.Spectroscope can also adopt the second prism, the maximum drift angle of second prism is the first drift angle of the second prism, the side that first drift angle is relative is the plane of incidence of the second prism, the face of the both sides of the first drift angle of the second prism is respectively the first reflecting surface and second reflecting surface of the second prism, first reflecting surface of the second prism is coated with high-reflecting film, second reflecting surface of the second prism is coated with spectro-film, the plane of incidence not plated film of the second prism; Seed source is injected into the plane of incidence of Amici prism through optical fiber coupling head, and after the first reflective surface, a part of light transmits through the second reflecting surface and exports as key light, and a part, through the second reflective surface, enters atomic air chamber as pump light.
Another object of the present invention is to provide a kind of small-sized control method without background saturation-absorption spectrum device.
The small-sized control method without background saturation-absorption spectrum device of the present invention, comprises the following steps:
1) seed light that sends of seed light source is after spectroscope, and a part transmits as key light, and another part light enters atomic air chamber as pump light;
2) pump light excited atom absorbs the absorption spectrum being formed and have Doppler broadening;
3) pump light is after atomic air chamber outgoing, is incident to the plane of incidence of the first prism;
4) by the angle of pitch and the angle of adjustment first prism, make pump light vertical with the plane of incidence;
5) after the plane of incidence of the high transmission of low reflection, fraction light as the first detection light, returns atomic air chamber through plane of incidence reflection, oppositely collinear with pump light, produces the absorption spectrum with multiple transmission peaks;
6) after the plane of incidence of the high transmission of low reflection, major part light enters the first prism through plane of incidence transmission, after the first reflective surface of the low transmission of high reverse--bias, again after the second reflective surface, the first prism is transmitted from the plane of incidence, enter atomic air chamber as the second detection light, produce Doppler broadening spectrum;
7) the first detection light after atomic air chamber and the second detection light are respectively by the first photodetector and the second photoelectric detector, what wherein the first detection light produced is the saturation-absorption spectrum signal containing Doppler broadening, second detection light contains Doppler broadening spectral signal, after subtracter, formed without background saturation-absorption spectrum.
Advantage of the present invention:
The present invention adopts prism, pump light excites Doppler's absorption spectrum by atomic air chamber, the plane of incidence being incident to prism after outgoing reflects to form the first detection light, with pump light oppositely and conllinear, and after the first reflecting surface and the second reflective surface, form the second detection light and enter atomic air chamber, subtract each other rear formation without background saturation-absorption spectrum from the first detection light after atomic air chamber outgoing and the second detection light; The invention solves original complicated in mechanical structure and huge problem, simplify light channel structure, can be integrated in the box of 30mm*50mm*20mm without background saturation-absorption spectrum device by whole; Meanwhile, because mechanical structure is simple, light path is convenient to tuning, and its mechanical stability is significantly improved, thus application is more extensive.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the saturation-absorption spectrum eliminating background;
Fig. 2 is the schematic diagram without background saturation-absorption spectrum device of the prior art;
Fig. 3 is the schematic diagram of the small-sized embodiment one without background saturation-absorption spectrum device of the present invention;
Fig. 4 is the schematic diagram of the small-sized embodiment two without background saturation-absorption spectrum device of the present invention;
Fig. 5 is the energy level transition resonance figure of alkali metal atom.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, set forth the present invention further.
Atom in atomic air chamber is alkali metal atom D
2, when with frequently, pump light A and first that intensity is higher detects light B and closes bundle in space, and when direction is contrary, spectral signal has occurred six transmission peaks.Reason is: detecting speed on light direction for first is the atom of zero, when pump light and the first same hyperfine levels transition detecting light and atom resonate, strong pump light makes atom reduce at the population of ground state, the absorption of the detection light of atom weakens, create the transmission peaks without Doppler's background, quantity is three; For speed on the first detection light direction be
(wherein C is the light velocity, v
i, v
jbe respectively i-th, a j hyperfine levels transition resonance frequency, v
0laser center frequency, i and j ∈ 1,2,3}) atom, when pump light and detection light frequency be v
iand v
jtime, pump light and i-th hyperfine levels transition resonate, and the first detection light and a jth hyperfine levels transition resonate, and also can produce the transmission peaks without Doppler's background, quantity is also three, as shown in Figure 5.Background and the transmission peaks without Doppler effect is absorbed containing Doppler in spectral signal now.
Embodiment one
As shown in Figure 3, the small-sized of the present embodiment comprises without background saturation-absorption spectrum device: seed light source 1, spectroscope 2, atomic air chamber 3, first prism 4, first and second photodetector 5 and subtracter; Wherein, first prism is right angle prism, first drift angle is right angle, the side relative with right angle is plane of incidence III, does not do plated film, and reflectivity is 4%, the side on both sides, right angle is respectively the first reflecting surface I and the second reflecting surface II, first reflecting surface is fully reflecting surface, and the second reflecting surface does not do plated film, and reflectivity is 4%; Spectroscope 2 adopts five or five light splitting pieces.The seed light that seed light source sends is through coupled fiber head 1 after five or five light splitting pieces, and a part transmits as key light, and another part light is as pump light A, and power is η, enters atomic air chamber 3, and excited atom absorbs the absorption spectrum being formed and have Doppler broadening; Pump light A, after atomic air chamber outgoing, is incident to the plane of incidence III of the first prism 4; By regulating the angle of pitch and the angle of the first prism 3, make pump light A vertical with plane of incidence III; After plane of incidence III, power is that 4% η light detects light B through plane of incidence reflection as first, returns atomic air chamber, oppositely collinear with pump light A, produces the absorption spectrum with multiple transmission peaks; Power is that 96% η light enters the first prism 4 through plane of incidence transmission, after the first reflecting surface I total reflection, again after the second reflecting surface II reflects, power is that 96%*96%*4%*96% η transmits the first prism from the plane of incidence, enters atomic air chamber as the second detection light C; Then there is A:B:C ≈ 1:0.04:0.035; The first detection light after atomic air chamber and the second detection light are received by the first photodetector and the second photodetector 4 respectively, do after difference processing, formed without background saturation-absorption spectrum through subtracter.
Embodiment two
As shown in Figure 4, in the present embodiment, spectroscope 2 adopts the second prism, second prism is right angle prism, right side, right angle is the plane of incidence of the second prism, and the plane of incidence does not do plated film, and the side on both sides, right angle is respectively the first reflecting surface and second reflecting surface of the second prism, first reflecting surface degree high-reflecting film of the second prism, the second reflecting surface plating five or five spectro-films of the second prism.Seed light is incident to the second prism through optical fiber coupling head 6, the plane of incidence through the second prism is transmitted through the first reflective surface, then through the second reflecting surface, 50% Transmission light exports as key light, from the second prism outgoing after 50% light reflection, enter atomic air chamber 3 as pump light A.Other structures are with embodiment one.
Adopt the second prism to reduce the volume of whole device, can device is integrated in the box of 30mm*50mm*20mm, be reduced to 50% of existing apparatus.
It is finally noted that the object publicizing and implementing example is to help to understand the present invention further, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the content disclosed in embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (8)
1. small-sizedly it is characterized in that without a background saturation-absorption spectrum device, described spectral device comprises: seed light source, spectroscope, atomic air chamber, the first prism, the first and second photodetectors; Wherein, the maximum drift angle of described first prism is the first drift angle, the side relative with the first drift angle is the plane of incidence, the side on the first drift angle both sides is respectively the first reflecting surface and the second reflecting surface, the plane of incidence is the high transmission plane of low reflection, first reflecting surface is the low transmission plane of high reverse--bias, and the second reflecting surface is the high transmission plane of low reflection; The seed light that described seed light source sends is after spectroscope, and a part transmits as key light, and another part light enters atomic air chamber as pump light, and excited atom absorbs the absorption spectrum being formed and have Doppler broadening; Pump light, after atomic air chamber outgoing, is incident to the plane of incidence of the first prism; By regulating the angle of pitch and the angle of the first prism, make pump light vertical with the plane of incidence; After the plane of incidence of the high transmission of low reflection, fraction light as the first detection light, returns atomic air chamber through plane of incidence reflection, oppositely collinear with pump light, produces the absorption spectrum with multiple transmission peaks; Major part light enters the first prism through plane of incidence transmission, after the first reflective surface of the low transmission of high reverse--bias, again after the second reflective surface, transmit the first prism from the plane of incidence, enter atomic air chamber as the second detection light, produce Doppler broadening spectrum; The first detection light after atomic air chamber and the second detection light are respectively by the first photodetector and the second photoelectric detector, what wherein the first detection light produced is the saturation-absorption spectrum signal containing Doppler broadening, second detection light creates Doppler broadening spectral signal, after subtracter, formed without background saturation-absorption spectrum.
2. spectral device as claimed in claim 1, it is characterized in that, described first prism is transparent material, and the surface of the first reflecting surface is coated with high-reflecting film, forms the low transmission plane of high reverse--bias; Second reflecting surface and the plane of incidence do not process, and form the high transmission plane of low reflection.
3. spectral device as claimed in claim 1, is characterized in that, by the distance between the straight line that regulates the high place of the first drift angle of pump light and the first prism, regulates the first detection light and second to detect distance between light.
4. spectral device as claimed in claim 1, it is characterized in that, described first drift angle is between 80 ~ 100 °.
5. spectral device as claimed in claim 1, is characterized in that, described spectroscope adopts light splitting piece; Or adopt the second prism.
6. spectral device as claimed in claim 5, it is characterized in that, the maximum drift angle of described second prism is the first drift angle of the second prism, the side that first drift angle is relative is the plane of incidence of the second prism, the face of the both sides of the first drift angle of the second prism is respectively the first reflecting surface and second reflecting surface of the second prism, first reflecting surface of the second prism is coated with high-reflecting film, and the second reflecting surface of the second prism is coated with spectro-film, the plane of incidence not plated film of the second prism.
7. a small-sized control method without background saturation-absorption spectrum device, is characterized in that, described control method comprises the following steps:
1) seed light that sends of seed light source is after spectroscope, and a part transmits as key light, and another part light enters atomic air chamber as pump light;
2) pump light excited atom absorbs the absorption spectrum being formed and have Doppler broadening;
3) pump light is after atomic air chamber outgoing, is incident to the plane of incidence of the first prism;
4) by the angle of pitch and the angle of adjustment first prism, make pump light vertical with the plane of incidence;
5) after the plane of incidence of the high transmission of low reflection, fraction light as the first detection light, returns atomic air chamber through plane of incidence reflection, oppositely collinear with pump light, produces the absorption spectrum with multiple transmission peaks;
6) after the plane of incidence of the high transmission of low reflection, major part light enters the first prism through plane of incidence transmission, after the first reflective surface of the low transmission of high reverse--bias, again after the second reflective surface, the first prism is transmitted from the plane of incidence, enter atomic air chamber as the second detection light, produce Doppler broadening spectrum;
7) the first detection light after atomic air chamber and the second detection light are respectively by the first photodetector and the second photoelectric detector, what wherein the first detection light produced is the saturation-absorption spectrum signal containing Doppler broadening, second detection light creates Doppler broadening spectral signal, after subtracter, formed without background saturation-absorption spectrum.
8. control method as claimed in claim 7, is characterized in that, by the distance between the straight line that regulates the high place of the first drift angle of pump light and the first prism, regulates the first detection light and second to detect distance between light.
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| CN108088766A (en) * | 2016-11-23 | 2018-05-29 | 北京自动化控制设备研究所 | A kind of alkali metal atom transfer method |
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| CN109755855A (en) * | 2019-03-11 | 2019-05-14 | 清华大学 | Frequency stabilized carbon dioxide laser optical path is composed in saturated absorption and frequency stabilized carbon dioxide laser is composed in saturated absorption |
| TWI732636B (en) * | 2020-07-29 | 2021-07-01 | 國立成功大學 | Laser stabilizing system and laser source module |
| CN117192815A (en) * | 2023-09-18 | 2023-12-08 | 上海频准激光科技有限公司 | Beam phase control system and method based on internal modulation |
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