CN109856888A - A kind of device and method enhancing the continuous variable compressed state optical field degree of compression - Google Patents
A kind of device and method enhancing the continuous variable compressed state optical field degree of compression Download PDFInfo
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- CN109856888A CN109856888A CN201910136571.0A CN201910136571A CN109856888A CN 109856888 A CN109856888 A CN 109856888A CN 201910136571 A CN201910136571 A CN 201910136571A CN 109856888 A CN109856888 A CN 109856888A
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Abstract
The present invention provides a kind of device and method for enhancing the continuous variable compressed state optical field degree of compression, including (output laser frequency is 2 ω to a dual laser0And ω0), acousto-optic modulator, the luminous power chamber and one block of nonlinear crystal being made of a fixed mirror and a vibrating mirror.Frequency is ω0Laser by being transformed into frequency after acousto-optic modulator be ω0±ωmTwo-beam.This two-beam is 2 ω as driving field and frequency0Pump light to be incident on luminous power simultaneously intracavitary, second nonlinear effect occurs for pump light and nonlinear crystal, and generations frequency is ω0Lower conversion light field, the lower conversion light field of generation and two driving fields generate radiation pressure jointly and luminous power interaction occurs for vibrating mirror realizes the preparation of the compressed state optical field of high compactness.The apparatus structure is compact, and stability is good, can be improved the degree of compression of lower conversion light, and increases compression bandwidth, has practical value in quantum accurate measurement and quantum communications field.
Description
Technical field
The present invention relates to quantum accurate measurement and quantum communications field, specifically a kind of raising continuous variable compressed state optical field
The degree of compression device and method.
Background technique
Compressed state optical field is an important light source in quantum optices experiment, in quantum communications and quantum accurate measurement
In, noise can be improved the sensitivity of communication equipment lower than the compressed state optical field of shot noise limit, break through the standard volume of measurement
The sub- limit carries out accurate measurement to physical quantity in quantum level, therefore in the fields such as gravitational wave detection and Weak absorption
All play very important effect.
Currently, generating continuous variable compressed state optical field using optical parametric oscillator (OPO) is more mature technology hand
Section, this method are mainly based upon the high nonlinear coefficient of nonlinear crystal and the oscillation back and forth of luminous power chamber, and there is device to stablize
Property is good, in the advantages such as laboratory is easy to operate.And in recent years as that studies gravitational wave detection gos deep into, it is generated using luminous power system
Squeezed light also becomes international hot research topic, the cavity that is mainly constituted using fixed mirror and vibrating mirror and with light
Effect is to prepare squeezed state.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of dresses of degree of compression for improving continuous variable compressed state optical field
It sets and method.
The present invention is achieved by the following technical solutions, a kind of dress enhancing the continuous variable compressed state optical field degree of compression
It sets, comprising: the dual laser of sequential, acousto-optic modulator and the luminous power being made of fixed plano-concave mirror and vibration plano-concave mirror
Chamber places a nonlinear crystal in the luminous power chamber.
Wherein, dual laser is dual wavelength continuous-wave laser, and output frequency is 2 ω0And ω0Laser.
Wherein, the frequency of dual laser output is ω0Laser by acousto-optic modulator, acousto-optic modulator for pair
Laser carries out frequency modulation(PFM), output frequency ω0±ωmTwo-beam.
Wherein, fixed plano-concave mirror and vibration plano-concave mirror constitute Fabry Paro chamber luminous power system；Wherein, fixed plano-concave mirror is solid
Fixed motionless, vibration plano-concave mirror is vibration, and eigenfrequency is ωm。
Wherein, when the chamber field of beam of laser driving luminous power chamber, chamber field is stimulated, and photon does back and forth movement intracavitary, hits
It hits on vibration plano-concave mirror, the radiation pressure of generation to vibrate plano-concave mirror deviation equilbrium position, and then causes luminous power chamber chamber long
It changes, so that the resonant frequency of luminous power chamber also changes therewith.
Wherein, one block of nonlinear crystal is placed in luminous power chamber, frequency is 2 ω0Pump light to be incident on luminous power intracavitary, and it is non-
Second nonlinear effect occurs for linear crystal, and generation frequency is ω0Lower conversion light field；Lower conversion light and frequency are ω0±ωm
Two-beam work together to vibration hysteroscope on.
The present invention is achieved by the following technical solutions, a kind of side for the degree of compression improving continuous variable compressed state optical field
Method includes the following steps:
Continuous wave dual-wavelength solid laser is 2 ω as laser light source, the frequency of output0Laser is directly injected into luminous power chamber；
Acousto-optic modulator is adjusted according to the eigenfrequency of vibrating mirror, so that another beam frequency is ω0Laser then pass through acousto-optic modulator
Generation frequency is ω0±ωmTwo-beam, and be input in luminous power chamber；
Frequency is 2 ω0Pump light impinge perpendicularly on that luminous power is intracavitary, occur lower turn of degeneracy parameter by intracavitary nonlinear crystal
It changes, is ω in the intracavitary simultaneously output frequency that generates0Light field；This light field and eigenfrequency are ωmVibration hysteroscope interaction,
Two frequency bands are generated, i.e., red detuning sideband ω0-ωmWith blue detuning sideband ω0+ωm；
The light field injection of acousto-optic modulator output is intracavitary, light beam and blue detuning sideband resonance (frequency ω0+ωm) and it is another
Detuning sideband resonance (the frequency ω of Shu Yuhong0-ωm), they interact as driving field in intracavitary participation luminous power.
It is different from the prior art, optical parametric oscillator (OPO) is combined together by the present invention with luminous power system, in luminous power
Nonlinear crystal is placed in the cavity of system, enhances the coupling between light field and vibrating mirror, by theoretical calculation, in weak pump light
The degree of compression is improved when input, and increases compression bandwidth.Parametric down conversion is carried out to light field and obtains degeneracy photon to rear, then
In luminous power chamber luminous power occurs for the blue detuning optical frequency photon of photon and injection and the photon of red detuning optical frequency allowed jointly
Interaction can not only obtain the lower conversion light field with compression, and can enhance the degree of compression, compression bandwidth be extended, in reality
There is important application value with the quantum information and field of precision measurement of change.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the device of the degree of compression of raising continuous variable compressed state optical field of the invention；
Fig. 2 is the quantum of the present invention with three kinds of squeezed lights of luminous power chamber and optical parametric oscillator (OPO) generation without crystal
The schematic diagram that noise compares；
Fig. 3 is Yi Jigai compared with the squeezed light that the present invention generates generates the bandwidth of squeezed light with optical parametric oscillator (OPO)
Become the schematic diagram of influence of the damped coefficient of vibrating mirror to bandwidth.
In figure: 1, dual laser, 2, acousto-optic modulator, 3, fixed plano-concave mirror, 4, nonlinear crystal, 5, vibration plano-concave
Mirror.
Specific embodiment
Further more detailed description is made to technical solution of the present invention With reference to embodiment.Obviously, it is retouched
The embodiment stated is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention,
Those of ordinary skill in the art's every other embodiment obtained without creative labor, all should belong to
The scope of protection of the invention.
A kind of device of the degree of compression of raising continuous variable compressed state optical field as shown in Figure 1, including dual laser
1, acousto-optic modulator 2 and two mirror luminous power resonant cavities, the two mirror luminous power resonant cavities are by fixing plano-concave mirror 3 and vibration plano-concave mirror 5
The luminous power chamber of composition and one block of KTP nonlinear crystal 4 are constituted.
Wherein, dual laser 1 is dual wavelength continuous-wave laser, and output frequency is 2 ω0And ω0Laser.
Wherein, the frequency that dual laser 1 exports is ω0Laser by acousto-optic modulator 2, acousto-optic modulator 2 is used
In to laser progress frequency modulation(PFM), output frequency ω0±ωmTwo-beam.
Wherein, fixed plano-concave mirror 3 constitutes Fabry Paro chamber luminous power system with vibration plano-concave mirror 5；Wherein, fixed plano-concave mirror
3 is fixed, and vibration plano-concave mirror 5 is vibration, and eigenfrequency is ωm。
Wherein, when the chamber field of beam of laser driving luminous power chamber, chamber field is stimulated, and photon does back and forth movement intracavitary, hits
It hits on vibration plano-concave mirror 5, the radiation pressure of generation to vibrate the deviation of plano-concave mirror 5 equilbrium position, and then leads to luminous power chamber chamber
Length changes, so that the resonant frequency of luminous power chamber also changes therewith.
Wherein, one block of nonlinear crystal 4 is placed in luminous power chamber, frequency is 2 ω0Pump light to be incident on luminous power intracavitary, with
Second nonlinear effect occurs for nonlinear crystal 4, and generation frequency is ω0Lower conversion light field；Lower conversion light and frequency are ω0±
ωmTwo-beam work together to vibration hysteroscope 5 on.
Times that 1 output wavelength of continuous wave dual laser can be 532 nanometers for 1064 nanometers of fundamental frequency light and wavelength
Frequency light, such dual laser technology are more mature.Fixed plano-concave mirror 3 is used as input and output coupling mirror, can be to its table
Face carries out coating film treatment, has high transmissivity to 532 nanometers of laser, and high to 1064 nanometers of laser anti-, emissivity is high
In 99.9%, make 1064 nanometers of laser in intracavitary oscillation.Vibration plano-concave mirror 5 all has the laser of 532 nanometers and 1064 nanometers
High reflectance, parameter can be that the eigenfrequency of vibration is 945 kHz, and effective mass is 43 nanograms, and Q value reaches 106, this light
Power chamber can refer to entitled " the Demonstration of that Simon Gr blacher et al. is delivered on nature physics
The article of an ultracold micro-optomechanical oscillator in a cryogenic cavity ".KTP
The nonlinear factor of nonlinear crystal 4 is higher, and both ends are plated with the high transmittance film of the laser to 532 nanometers and 1064 nanometers.
Fig. 2 show the noise power spectrum of the orthogonal amplitude of the output field in more several situations.In Fig. 2, sparse void
Line indicates the noise spectrum for the squeezed light for only having luminous power chamber to generate；Solid line indicates the squeezed light only generated by parametric down conversion process
Noise spectrum；And intensive dotted line is then to combine the two, nonlinear crystal is put into luminous power chamber, parametric down conversion generation occurs
Squeezed light noise spectrum, it can be seen that noise spectrum reduce namely compression enhances.
Fig. 3 is shown with the bandwidth that three curves compare squeezed spectra.Solid line indicates the compression for there was only under parametric down conversion effect
Optical power spectrum；Sparse dotted line and intensive dotted line are that opto-mechanical effect and parametric down conversion are coefficient as a result, this two
The difference of curve is the damped coefficient γ of the corresponding vibration plano-concave mirror of intensive dotted linem It is more flat than the vibration that sparse dotted line is chosen
The damped coefficient γ of concave mirrormIt is bigger.Three curves are compared, it can be deduced that conclusion, the invention can increase the band of squeezed light
Width chooses the compressed state optical field of the available large bandwidth of biggish damped coefficient.
A kind of method of degree of compression improving continuous variable compressed state optical field of the present invention, includes the following steps:
Continuous wave dual-wavelength solid laser is 2 ω as laser light source, the frequency of output0Laser is directly injected into luminous power chamber；
Acousto-optic modulator is adjusted according to the eigenfrequency of vibrating mirror, so that another beam frequency is ω0Laser then pass through acousto-optic modulator
Generation frequency is ω0±ωmTwo-beam, and be input in luminous power chamber；
Frequency is 2 ω0Pump light impinge perpendicularly on that luminous power is intracavitary, occur lower turn of degeneracy parameter by intracavitary nonlinear crystal
It changes, is ω in the intracavitary simultaneously output frequency that generates0Light field；This light field and eigenfrequency are ωmVibration hysteroscope interaction,
Two frequency bands are generated, i.e., red detuning sideband ω0-ωmWith blue detuning sideband ω0+ωm；
The light field injection of acousto-optic modulator output is intracavitary, light beam and blue detuning sideband resonance (frequency ω0+ωm) and it is another
Detuning sideband resonance (the frequency ω of Shu Yuhong0-ωm), they interact as driving field in intracavitary participation luminous power.
Core of the invention is a kind of device for generating continuous variable compressed state optical field.The device can produce stability height
Wide bandwidth continuous variable compressed state optical field.Continuous variable squeezed state light source caused by it is suitably applied quantum information net
Network and field of precision measurement.
It is different from the prior art, optical parametric oscillator (OPO) is combined together by the present invention with luminous power system, in luminous power
Nonlinear crystal is placed in the cavity of system, enhances the coupling between light field and vibrating mirror, by theoretical calculation, in weak pump light
The degree of compression is improved when input, and increases compression bandwidth.Parametric down conversion is carried out to light field and obtains degeneracy photon to rear, then
In luminous power chamber luminous power occurs for the blue detuning optical frequency photon of photon and injection and the photon of red detuning optical frequency allowed jointly
Interaction can not only obtain the lower conversion light field with compression, and can enhance the degree of compression, compression bandwidth be extended, in reality
There is important application value with the quantum information and field of precision measurement of change.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (7)
1. a kind of device for enhancing the continuous variable compressed state optical field degree of compression characterized by comprising the dual wavelength of sequential
Laser (1), acousto-optic modulator (2) and the luminous power chamber being made of fixed plano-concave mirror (3) and vibration plano-concave mirror (5), the luminous power
A nonlinear crystal (4) are placed in chamber.
2. a kind of device for enhancing the continuous variable compressed state optical field degree of compression as described in claim 1, which is characterized in that described
Dual laser (1) is dual wavelength continuous-wave laser, and output frequency is 2 ω0And ω0Laser.
3. a kind of device for enhancing the continuous variable compressed state optical field degree of compression as claimed in claim 2, which is characterized in that described
The frequency of dual laser (1) output is ω0Laser by acousto-optic modulator (2), acousto-optic modulator (2) is used for laser
Carry out frequency modulation(PFM), output frequency ω0±ωmTwo-beam.
4. a kind of device for enhancing the continuous variable compressed state optical field degree of compression as described in claim 1, which is characterized in that fixed
Plano-concave mirror (3) and vibration plano-concave mirror (5) constitute Fabry Paro chamber luminous power system；Wherein, fixed plano-concave mirror (3) are fixed,
Vibration plano-concave mirror (5) is vibration, and eigenfrequency is ωm。
5. a kind of device for enhancing the continuous variable compressed state optical field degree of compression as claimed in claim 4, which is characterized in that when one
When the chamber field of beam Laser Driven luminous power chamber, chamber field is stimulated, and photon does back and forth movement intracavitary, impinges upon vibration plano-concave mirror (5)
On, the radiation pressure of generation to vibrate plano-concave mirror (5) deviation equilbrium position, and then luminous power chamber chamber length is caused to change, with
The resonant frequency of luminous power chamber is set also to change therewith.
6. a kind of device for enhancing the continuous variable compressed state optical field degree of compression as described in claim 1, which is characterized in that luminous power
One piece of nonlinear crystal (4) is placed in chamber, frequency is 2 ω0Pump light to be incident on luminous power intracavitary, sent out with nonlinear crystal (4)
Raw second nonlinear effect, generation frequency are ω0Lower conversion light field；Lower conversion light and frequency are ω0±ωmTwo-beam it is total
On same-action to vibration hysteroscope (5).
7. a kind of method for the degree of compression for improving continuous variable compressed state optical field, is connected using the enhancing as described in claim 1-6
The device of continuous variable compression state lightfield compression degree carries out degree of compression raising, which comprises the steps of:
Continuous wave dual-wavelength solid laser is 2 ω as laser light source, the frequency of output0Laser is directly injected into luminous power chamber；Root
Acousto-optic modulator is adjusted according to the eigenfrequency of vibrating mirror, so that another beam frequency is ω0Laser then pass through acousto-optic modulator produce
Raw frequency is ω0±ωmTwo-beam, and be input in luminous power chamber；
Frequency is 2 ω0Pump light impinge perpendicularly on that luminous power is intracavitary, occur lower turn of degeneracy parameter by intracavitary nonlinear crystal
It changes, is ω in the intracavitary simultaneously output frequency that generates0Light field；This light field and eigenfrequency are ωmVibration hysteroscope interaction,
Two frequency bands are generated, i.e., red detuning sideband ω0-ωmWith blue detuning sideband ω0+ωm；
The light field injection of acousto-optic modulator output is intracavitary, light beam and blue detuning sideband resonance (frequency ω0+ωm) and another beam
With red detuning sideband resonance (frequency ω0-ωm), they interact as driving field in intracavitary participation luminous power.
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Cited By (5)
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| CN111061114A (en) * | 2019-11-01 | 2020-04-24 | 华南理工大学 | Full optical fiber continuous compression state light field generating device |
| CN111555100A (en) * | 2020-04-29 | 2020-08-18 | 山西大学 | Device and method for generating high-order transverse mode compression light by utilizing three-mode opto-mechanical system |
| CN111999904A (en) * | 2020-08-26 | 2020-11-27 | 东南大学 | Device for generating super-chiral optical field |
| CN112350143A (en) * | 2020-11-25 | 2021-02-09 | 中国科学技术大学 | High-brightness compressed light source based on conversion process under excited parameter |
| CN114415441A (en) * | 2021-12-16 | 2022-04-29 | 山西大学 | Multi-component entangled-state light field generation device and method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061114A (en) * | 2019-11-01 | 2020-04-24 | 华南理工大学 | Full optical fiber continuous compression state light field generating device |
| CN111555100A (en) * | 2020-04-29 | 2020-08-18 | 山西大学 | Device and method for generating high-order transverse mode compression light by utilizing three-mode opto-mechanical system |
| CN111999904A (en) * | 2020-08-26 | 2020-11-27 | 东南大学 | Device for generating super-chiral optical field |
| CN111999904B (en) * | 2020-08-26 | 2022-04-15 | 东南大学 | Device for generating super-chiral optical field |
| CN112350143A (en) * | 2020-11-25 | 2021-02-09 | 中国科学技术大学 | High-brightness compressed light source based on conversion process under excited parameter |
| CN112350143B (en) * | 2020-11-25 | 2024-07-02 | 中国科学技术大学 | High-brightness compressed light source based on stimulated parameter down-conversion process |
| CN114415441A (en) * | 2021-12-16 | 2022-04-29 | 山西大学 | Multi-component entangled-state light field generation device and method |
| CN114415441B (en) * | 2021-12-16 | 2023-11-14 | 山西大学 | Multi-component entangled state light field generating device and method |
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