CN109374554A - A kind of laser frequency scanning means and method - Google Patents
A kind of laser frequency scanning means and method Download PDFInfo
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- CN109374554A CN109374554A CN201811499043.3A CN201811499043A CN109374554A CN 109374554 A CN109374554 A CN 109374554A CN 201811499043 A CN201811499043 A CN 201811499043A CN 109374554 A CN109374554 A CN 109374554A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention relates to laser frequency scanning technique, specifically a kind of laser frequency scanning means and method.The present invention solves the problems, such as that existing laser frequency scanning technique causes the frequency of the exploring laser light after frequency sweep that substantially offset and then principle resonance occurs.A kind of laser frequency scanning means, including optical fiber collimator, first sound-optic modulator, convex lens, second sound-optic modulator, avalanche photodetector, the first voltage controlled oscillator, the second voltage controlled oscillator, the first beam collection pond, the second beam collection pond, oscillograph；Wherein, the incidence end face of the exit end of optical fiber collimator and first sound-optic modulator；The convex lens that focal length is 100mm is equipped between the exit end of first sound-optic modulator and the incidence end of second sound-optic modulator；First sound-optic modulator, second sound-optic modulator are respectively positioned at two times of focal lengths of convex lens；The exit end of second sound-optic modulator and the incidence end face of avalanche photodetector.The present invention is scanned suitable for laser frequency.
Description
Technical field
The present invention relates to laser frequency scanning technique, specifically a kind of laser frequency scanning means and method.
Background technique
Cold atoms sample is widely used in accurate measurement, super cold chemistry, quantum gas, formation of ultra-cold molecules, quantum information, original
The fields such as secondary clock.Magneto-Optical Trap is to prepare cold atoms sample one of technology the most mature at present.By surpassing in detection Magneto-Optical Trap
The parameter measurement and optimization of Magneto-Optical Trap may be implemented in the quantity and density of cold atom sample.The cold atoms in detection Magneto-Optical Trap
When the quantity and density of sample, it is desirable that the direction of exploring laser light cannot be changed while the frequency of scanning probe laser.In order to
Meet above-mentioned requirements, generallys use double times at present by the method for acousto-optic modulator come the frequency of scanning probe laser.However it is real
Trample show double time methods by acousto-optic modulator since itself principle is limited, the frequency of the exploring laser light after will lead to frequency sweep
Substantially offset and then principle resonance occurs, thus brings following problem: if the Frequency Locking of exploring laser light is in atomic resonance frequency
Near rate, then it is far that the frequency that this method will lead to the exploring laser light after frequency sweep deflects away from atomic resonance frequency, thus causes to detect
The frequency range of laser can not cover the frequency of atomic resonance transition, can not be successfully progress so as to cause detection.Based on this,
It is necessary to invent a kind of completely new laser frequency scanning means and method, lead to frequency sweep to solve existing laser frequency scanning technique
The problem of substantially offset and then principle resonance, occurs for the frequency of exploring laser light afterwards.
Summary of the invention
The present invention causes the frequency of the exploring laser light after frequency sweep to occur substantially to solve existing laser frequency scanning technique
The problem of offset and then principle resonance, provide a kind of laser frequency scanning means and method.
The present invention is achieved by the following technical scheme:
A kind of laser frequency scanning means, including optical fiber collimator, first sound-optic modulator, convex lens, second sound-optic modulator,
Avalanche photodetector, the second voltage controlled oscillator, the first beam collection pond, the second beam collection pond, shows the first voltage controlled oscillator
Wave device；
Wherein, the incidence end face of the exit end of optical fiber collimator and first sound-optic modulator；The outgoing of first sound-optic modulator
The convex lens that focal length is 100mm is equipped between end and the incidence end of second sound-optic modulator；First sound-optic modulator, the second acousto-optic
Modulator is respectively positioned at two times of focal lengths of convex lens；The exit end of second sound-optic modulator and the incidence end of avalanche photodetector
Face；The output end of avalanche photodetector and the input terminal of oscillograph connect；The output end of first voltage controlled oscillator and first
The modulated terminal of acousto-optic modulator connects；The output end of second voltage controlled oscillator and the modulated terminal of second sound-optic modulator connect；The
One beam collection pond is between first sound-optic modulator and convex lens, and the first beam collection pond and first sound-optic modulator
Exit end face；Second beam collection pond is between second sound-optic modulator and avalanche photodetector, and the second light beam is received
The exit end of Ji Chi and second sound-optic modulator is tiltedly right.
(this method is realized based on a kind of laser frequency scanning means of the present invention for a kind of laser frequency scan method
), this method is realized using following steps:
Step a: being 2.1 × 10 in vacuum degree-9Magneto-Optical Trap is loaded in the vacuum chamber of Pa, super cold sodium atom is obtained in Magneto-Optical Trap
Sample, super cold sodium atom sample form spherical atomic cloud in the vacuum chamber；
Step b: the wave band from optical fiber is that the exploring laser light of 589nm is incident on the first acousto-optic modulation after optical fiber collimator collimates
Device, and after first sound-optic modulator frequency sweep formed offset frequency 200+ σ MHz positive first-order diffraction laser；Positive first-order diffraction laser warp
It is incident on second sound-optic modulator after convex lens refraction, and forms offset frequency -200+ σ MHz's after second sound-optic modulator frequency sweep
Negative one grade diffracted laser；Spherical atomic cloud in negative one grade diffracted laser direct projection vacuum chamber, and enter after spherical atom cloud absorption
It is mapped to avalanche photodetector, is then converted to electric signal through avalanche photodetector；Electric signal transmission is to oscillograph, and through showing
Wave device is converted to Atomic absorption spectral line；
Step c: by observing and analyzing Atomic absorption spectral line, the quantity and density of the cold sodium atom sample of excess of export are calculated, thus in fact
The parameter measurement and optimization of existing Magneto-Optical Trap.
Compared with existing laser frequency scanning technique, a kind of laser frequency scanning means of the present invention and method pass through
Using brand new principle, the frequency and direction of the exploring laser light after ensure that frequency sweep do not shift, thus have following excellent
Point: if the Frequency Locking of exploring laser light near atomic resonance frequency, then the frequency of the exploring laser light after frequency sweep is also in atom
Near resonant frequency, thereby ensure that the frequency range of exploring laser light can cover the frequency of atomic resonance transition, thus
It ensure that going on smoothly for detection.
The present invention, which efficiently solves existing laser frequency scanning technique, causes the frequency of the exploring laser light after frequency sweep to occur greatly
The problem of width offset and then principle resonance, it is suitable for laser frequency and scans.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of laser frequency scanning means in the present invention.
In figure: 1- optical fiber collimator, 2- first sound-optic modulator, 3- convex lens, 4- second sound-optic modulator, 5- snowslide light
Electric explorer, the first voltage controlled oscillator of 6-, the second voltage controlled oscillator of 7-, the first beam collection of 8- pond, the second beam collection of 9- pond,
10- optical fiber.
Specific embodiment
A kind of laser frequency scanning means, including optical fiber collimator 1, first sound-optic modulator 2, convex lens 3, the second acousto-optic
Modulator 4, avalanche photodetector 5, the first voltage controlled oscillator 6, the second voltage controlled oscillator 7, the first beam collection pond 8, second
Beam collection pond 9, oscillograph；
Wherein, the incidence end face of the exit end of optical fiber collimator 1 and first sound-optic modulator 2；First sound-optic modulator 2 goes out
The convex lens 3 for being equipped with that focal length is 100mm is penetrated between end and the incidence end of second sound-optic modulator 4；First sound-optic modulator 2,
Two acousto-optic modulators 4 are respectively positioned at two times of focal lengths of convex lens 3；The exit end and avalanche optoelectronic of second sound-optic modulator 4 detect
The incidence end face of device 5；The output end of avalanche photodetector 5 and the input terminal of oscillograph connect；First voltage controlled oscillator 6
Output end is connect with the modulated terminal of first sound-optic modulator 2；The output end and second sound-optic modulator 4 of second voltage controlled oscillator 7
Modulated terminal connection；First beam collection pond 8 is between first sound-optic modulator 2 and convex lens 3, and the first beam collection pond
8 with the exit end face of first sound-optic modulator 2；Second beam collection pond 9 is located at second sound-optic modulator 4 and avalanche optoelectronic is visited
It surveys between device 5, and the second beam collection pond 9 and the exit end of second sound-optic modulator 4 are tiltedly right.
(this method is realized based on a kind of laser frequency scanning means of the present invention for a kind of laser frequency scan method
), this method is realized using following steps:
Step a: being 2.1 × 10 in vacuum degree-9Magneto-Optical Trap is loaded in the vacuum chamber of Pa, super cold sodium atom is obtained in Magneto-Optical Trap
Sample, super cold sodium atom sample form spherical atomic cloud in the vacuum chamber；
Step b: the exploring laser light that the wave band from optical fiber 10 is 589nm is incident on the first acousto-optic after the collimation of optical fiber collimator 1
Modulator 2, and after 2 frequency sweep of first sound-optic modulator formed offset frequency 200+ σ MHz positive first-order diffraction laser；Positive first-order diffraction
Laser planoconvex lens 3 are incident on second sound-optic modulator 4 after reflecting, and offset frequency-is formed after 4 frequency sweep of second sound-optic modulator
The negative one grade diffracted laser of 200+ σ MHz；Spherical atomic cloud in negative one grade diffracted laser direct projection vacuum chamber, and through spherical atom
It is incident on avalanche photodetector 5 after cloud absorption, is then converted to electric signal through avalanche photodetector 5；Electric signal transmission is extremely
Oscillograph, and Atomic absorption spectral line is converted to through oscillograph；
Step c: by observing and analyzing Atomic absorption spectral line, the quantity and density of the cold sodium atom sample of excess of export are calculated, thus in fact
The parameter measurement and optimization of existing Magneto-Optical Trap.
In the step b, by the rf frequency and second voltage controlled oscillator 7 that adjust the first voltage controlled oscillator 6 in real time
Rf frequency can change the value of σ in real time.
Claims (3)
1. a kind of laser frequency scanning means, it is characterised in that: including optical fiber collimator (1), first sound-optic modulator (2), convex
Lens (3), second sound-optic modulator (4), avalanche photodetector (5), the first voltage controlled oscillator (6), the second voltage controlled oscillator
(7), the first beam collection pond (8), the second beam collection pond (9), oscillograph；
Wherein, the incidence end face of the exit end of optical fiber collimator (1) and first sound-optic modulator (2)；First sound-optic modulator
(2) convex lens (3) that focal length is 100mm is equipped between the incidence end of exit end and second sound-optic modulator (4)；First acousto-optic
Modulator (2), second sound-optic modulator (4) are respectively positioned at two times of focal lengths of convex lens (3)；Second sound-optic modulator (4) goes out
Penetrate the incidence end face at end Yu avalanche photodetector (5)；The output end of avalanche photodetector (5) and the input terminal of oscillograph
Connection；The output end of first voltage controlled oscillator (6) is connect with the modulated terminal of first sound-optic modulator (2)；Second voltage controlled oscillator
(7) output end is connect with the modulated terminal of second sound-optic modulator (4)；First beam collection pond (8) is located at the first acousto-optic modulation
Between device (2) and convex lens (3), and the exit end face in the first beam collection pond (8) and first sound-optic modulator (2)；Second
Beam collection pond (9) is located between second sound-optic modulator (4) and avalanche photodetector (5), and the second beam collection pond (9)
It is tiltedly right with the exit end of second sound-optic modulator (4).
2. a kind of laser frequency scan method, this method is based on a kind of laser frequency scanning means as described in claim 1
It realizes, it is characterised in that: this method is realized using following steps:
Step a: being 2.1 × 10 in vacuum degree-9Magneto-Optical Trap is loaded in the vacuum chamber of Pa, super cold sodium atom sample is obtained in Magneto-Optical Trap
Product, super cold sodium atom sample form spherical atomic cloud in the vacuum chamber；
Step b: the exploring laser light that the wave band from optical fiber (10) is 589nm is incident on first after optical fiber collimator (1) collimation
Acousto-optic modulator (2), and after first sound-optic modulator (2) frequency sweep formed offset frequency 200+ σ MHz positive first-order diffraction laser；Just
It is incident on second sound-optic modulator (4) after first-order diffraction laser planoconvex lens (3) refraction, and is swept through second sound-optic modulator (4)
The negative one grade diffracted laser of offset frequency -200+ σ MHz is formed after frequency；Spherical atomic cloud in negative one grade diffracted laser direct projection vacuum chamber,
And avalanche photodetector (5) are incident on after spherical atom cloud absorption, then telecommunications is converted to through avalanche photodetector (5)
Number；Electric signal transmission is converted to Atomic absorption spectral line through oscillograph to oscillograph；
Step c: by observing and analyzing Atomic absorption spectral line, the quantity and density of the cold sodium atom sample of excess of export are calculated, thus in fact
The parameter measurement and optimization of existing Magneto-Optical Trap.
3. a kind of laser frequency scan method according to claim 2, it is characterised in that: in the step b, by real-time
The rf frequency of the first voltage controlled oscillator (6) and the rf frequency of the second voltage controlled oscillator (7) are adjusted, can change in real time σ's
Value.
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| CN201811499043.3A CN109374554B (en) | 2018-12-08 | 2018-12-08 | Laser frequency scanning device and method |
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| CN201811499043.3A CN109374554B (en) | 2018-12-08 | 2018-12-08 | Laser frequency scanning device and method |
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