CN107561819A - A kind of squeezed vacuum state light field generating means and method - Google Patents
A kind of squeezed vacuum state light field generating means and method Download PDFInfo
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- CN107561819A CN107561819A CN201710787482.3A CN201710787482A CN107561819A CN 107561819 A CN107561819 A CN 107561819A CN 201710787482 A CN201710787482 A CN 201710787482A CN 107561819 A CN107561819 A CN 107561819A
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Abstract
The invention discloses a kind of squeezed vacuum state light field generating means and method, described device to include：Laser, optical parametric oscillator, frequency shifting arrangement, temperature regulating device, lock chamber device, half-wave plate, the first polarized light beam splitting mirror, the second polarized light beam splitting mirror, dichroic mirror；Quick frequency displacement to continuous single-frequency laser can be realized by frequency shifting arrangement, obtain fill-in light, and the direction of propagation of laser will not be changed；Fill-in light obtains carrying the fill-in light of chamber information after optical parametric oscillator, lock chamber signal can be produced according to the fill-in light for carrying chamber information by locking chamber device, enter an actor's rendering of an operatic tune length locking to optical parametric oscillator, temperature regulating device can realize the accurate temperature controlling to crystal, optical parametric oscillator is operated in degeneracy state.Using the device or method of the present invention, the problem of seed injection light can be avoided or three Resonant parametric oscillators must be used, the mechanical stability of optical parametric oscillator is maintained, so as to obtain the squeezed vacuum state light field of stable output.
Description
Technical field
The present invention relates to optical field, more particularly to a kind of squeezed vacuum state light field generating means and method.
Background technology
Prepared using the following optical parametric oscillator of threshold value (Optical Parametric Oscillator, abbreviation OPO)
Continuous variable quantum vacuum pressure source is the effective method of comparative maturity.The degeneracy OPO of generally use I saphes matching obtains true
Empty pressure source.When degeneracy OPO is run on below threshold value, caused flashlight and idle light mean field are zero, i.e. degeneracy OPO is now
Export as vacuum compression source.
In the case where the chamber length of OPO chambers is uncontrolled, extraneous mechanical disturbance influences whether the generation in vacuum compression source
And use.The common line-locked technology of chamber progress to OPO chambers needs faint identical with vacuum compression source frequency by one
Polarize in consistent seed light injection OPO chambers to extract lock chamber signal, but so device is transformed into as optical parameter
Amplifier, it is impossible to obtain proper vacuum compression source.Even if the very faint seed light of injection, in low frequency ranges
Classical noise inside can be also introduced, influences the quality at the low frequency of vacuum compression source.
Another kind lock chamber technology is OPO is run on three resonance states, and extraction pump light transmission signal carries out lock chamber.So
And three resonance OPO pump light can resonate in intracavitary, now the parameter such as requirement such as temperature, crystal length to OPO chambers can more
It is harsh, it is not easy to realize steady running.
The content of the invention
It is an object of the invention to provide a kind of squeezed vacuum state light field generating means and method, shaken to lock optical parameter
The chamber length of device is swung, obtains the squeezed vacuum state light field of stable output.
To achieve the above object, the invention provides following scheme：
A kind of squeezed vacuum state light field generating means, described device include：Laser, optical parametric oscillator, frequency displacement dress
Put, temperature regulating device, lock chamber device, half-wave plate, the first polarized light beam splitting mirror, the second polarized light beam splitting mirror, dichroic mirror；
The laser is used to produce continuous single-frequency laser；
The first polarized light beam splitting mirror, is arranged on the first emitting light path of the laser, for will be described continuous
Single-frequency laser reflexes to the optical parametric oscillator, obtains simulated light；
The frequency shifting arrangement, be arranged on the second emitting light path of the laser, for according to the simulated light to institute
State continuous single-frequency laser and carry out frequency displacement, obtain fill-in light；
The half-wave plate, it is arranged on the emitting light path of the frequency shifting arrangement, for controlling the polarization side of the fill-in light
To for horizontal polarization；
The fill-in light is transmitted through the optical parametric oscillator by the first polarized light beam splitting mirror；
The optical parametric oscillator, it is arranged on the emitting light path of the first polarized light beam splitting mirror, for described
Fill-in light is transmitted, and obtains the first transmitted light；
The dichroic mirror, it is arranged on the emitting light path of the optical parametric oscillator, for first transmitted light
Reflected, obtain the first reflected light；
The continuous single-frequency laser that the laser is launched is transmitted through the optical parameter by the dichroic mirror and shaken
Device is swung, as pump light, squeezed vacuum state light field is produced according to optical parametric oscillator described in the pumping optical pumping；
The second polarized light beam splitting mirror, it is arranged on the dichroic mirror emitting light path, for first reflected light
Transmitted, obtain the second transmitted light；
The lock chamber device, is arranged on the emitting light path of the second polarized light beam splitting mirror, for receiving described second
Transmitted light；It is described lock chamber device, be connected with the optical parametric oscillator, for according to second transmitted light to the optics
Parametric oscillator enters an actor's rendering of an operatic tune length locking；
The temperature regulating device, it is connected with the optical parametric oscillator, for controlling in the optical parametric oscillator
Crystal temperature effect.
The optional frequency shifting arrangement includes signal generator, power amplifier, electro-optic phase modulator；The signal hair
Raw device, for producing sine wave signal；The power amplifier, it is connected with the signal generator, for the sine wave
Signal is amplified, and is amplified signal；The electro-optic phase modulator, it is connected with the power amplifier, for receiving
Amplified signal is stated, and frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, is obtained described
Fill-in light.
Optionally, the optical parametric oscillator includes plano-concave mirror, nonlinear crystal；
The plano-concave mirror, is arranged on the transmitted light path of the dichroic mirror, described non-for the pump light to be transmitted through
The inside of linear crystal；
The nonlinear crystal, it is arranged on the transmitted light path of the plano-concave mirror, for producing institute according to the pump light
State squeezed vacuum state light field；
The fill-in light is transmitted through the plano-concave mirror by the nonlinear crystal, and the plano-concave mirror is saturating by the fill-in light
The dichroic mirror is incident upon, obtains the first transmitted light.
Optionally, the lock chamber device includes photodetector, lock-in amplifier, proportional plus integral plus derivative controller and high pressure
Amplifier；
The photodetector, it is arranged on the emitting light path of the second polarized light beam splitting mirror, for by described second
Transmitted light is converted to electric signal；
The signal input part of the lock-in amplifier is connected with the signal output part of the photodetector, for according to institute
State electric signal and obtain error signal；
The error-signal output of the signal input part of the proportional plus integral plus derivative controller and the lock-in amplifier connects
Connect, for the error signal to be adjusted, obtain regulating error signal；
The signal input part of the high-voltage amplifier modulated signal output end with the lock-in amplifier and institute respectively
State the signal output part connection of proportional plus integral plus derivative controller；The high-voltage amplifier is used for the modulation of the lock-in amplifier
Signal and the regulating error signal carry out Hybrid amplifier, obtain locking chamber signal；
Piezoelectric ceramics, the signal output part of the high-voltage amplifier and the piezoelectric ceramics are provided with the plano-concave mirror
Signal control terminal connects.
Optionally, the temperature regulating device includes temperature controller, Peltier element, thermistor and holding furnace；
The holding furnace, the outside of the nonlinear crystal is arranged on, for being incubated to the nonlinear crystal；
The thermistor, it is arranged in the holding furnace, for measuring the actual temperature of nonlinear crystal；And by described in
Actual temperature is sent to the temperature controller；
The temperature controller, for setting the operating temperature of the nonlinear crystal；And calculate the actual temperature with it is described
The difference of operating temperature, obtains temperature gap；The temperature controller controls the Peltier element according to the temperature gap；
The Peltier element, is arranged in the holding furnace, is connected with the temperature controller, described non-linear for adjusting
The temperature of crystal.
Present invention also offers a kind of squeezed vacuum state light field generation method, methods described is applied to a kind of above-mentioned vacuum pressure
Contracting state light field generating means,
Methods described includes：
Obtain continuous single-frequency laser；
The continuous single-frequency laser is reflected, obtains simulated light；
Frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, obtains fill-in light；
The fill-in light is converted into electric signal；
The modulated signal of the electric signal and the lock-in amplifier is mixed, demodulation filtering, obtains error letter
Number；
Proportional integration, differential control are carried out to the error signal, obtains regulating error signal；
Hybrid amplifier is carried out to the modulated signal and the regulating error signal, obtains lock chamber signal；
An actor's rendering of an operatic tune length locking is entered according to the lock chamber signal；
Produce stable squeezed vacuum state light field.
Optionally, it is described to produce stable squeezed vacuum state light field, specifically include
Obtain pump light；
The pump light produces signal light field and idle light field by optical parametric oscillator process；
It is degeneracy point to control the reaction temperature of the signal light field and the idle light field, while by the work(of the pump light
Rate is controlled below threshold value, produces stable squeezed vacuum state light field.
Optionally, it is described that frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, fill-in light is obtained, specific bag
Include：
Obtain sine wave signal；
The sine wave signal is amplified, is amplified signal；
Frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, obtains fill-in light.
Optionally, described to control the reaction temperature of the signal light field and the idle light field be degeneracy point, is specifically included：
Set the operating temperature of the signal light field and the idle light field；
Obtain the actual temperature of the signal light field and the idle light field；
The difference of the operating temperature and the actual temperature is calculated, obtains temperature gap；
It is degeneracy point to control the reaction temperature of the signal light field and the idle light field according to the temperature gap.
Compared with prior art, the present invention has following technique effect：The invention provides a kind of squeezed vacuum state light field
Generating means and method, the quick frequency displacement to continuous single-frequency laser can be realized by frequency shifting arrangement, obtain fill-in light, and will not
Change the direction of propagation of laser；Fill-in light obtains carrying the fill-in light of chamber information after optical parametric oscillator, locks chamber device
Lock chamber signal can be produced according to the fill-in light for carrying chamber information, an actor's rendering of an operatic tune length locking, temperature regulating device are entered to optical parametric oscillator
The accurate temperature controlling to crystal can be realized, optical parametric oscillator is operated in degeneracy state.The present apparatus and method avoid note
The problem of entering seed light or three Resonant parametric oscillators must be used, maintain the mechanically stable of optical parametric oscillator
Property, so as to obtain the squeezed vacuum state light field of stable output.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of structural representation of squeezed vacuum state light field generating means provided in an embodiment of the present invention；
Fig. 2 is simulated light provided in an embodiment of the present invention and the resonance mode with fill-in light in optical parametric oscillator chamber
Figure；
Fig. 3 be simulated light provided in an embodiment of the present invention with the fill-in light after frequency displacement being total in optical parameter shakes device chamber
Shake ideograph；
Fig. 4 is the structural representation of the measurement apparatus measured to the squeezed vacuum state light field of generation；
Fig. 5 is the noise bounce frequency spectrum for the squeezed vacuum state light field that measurement apparatus detects optical parametric oscillator output
Figure；
Fig. 6 is a kind of flow chart of squeezed vacuum state light field generation provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
It is an object of the invention to provide a kind of squeezed vacuum state light field generating means and method, shaken to lock optical parameter
The chamber length of device is swung, obtains the squeezed vacuum state light field of stable output.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is further detailed explanation.
Fig. 1 is a kind of structural representation of squeezed vacuum state light field generating means provided in an embodiment of the present invention.
A kind of squeezed vacuum state light field generating means as shown in Figure 1, including：Laser, optical parametric oscillator 1, frequency
Moving device 2, temperature regulating device 3, lock chamber device 4, half-wave plate 6, the first polarized light beam splitting mirror 7, dichroic mirror 8, the second polarized light beam splitting
Mirror 9；
The optical parametric oscillator 1 includes nonlinear crystal 101, plano-concave mirror 102 and piezoelectric ceramics 103；
The frequency shifting arrangement 2 includes signal generator 201, power amplifier 202, electro-optic phase modulator 203；
The temperature regulating device 3 includes temperature controller 301, thermistor 302, Peltier element 303 and holding furnace 304；
The lock chamber device 4 includes lock-in amplifier 401, proportional plus integral plus derivative controller 402, the and of high-voltage amplifier 403
Photodetector 404.
The half-wave plate 6, it is arranged on the emitting light path of the frequency shifting arrangement 2；The first polarized light beam splitting mirror 7, if
Put on the first emitting light path of the laser；The dichroic mirror 8, it is arranged on the emergent light of the optical parametric oscillator 1
Lu Shang；The second polarized light beam splitting mirror 9, it is arranged on the emitting light path of dichroic mirror 8.
The squeezed vacuum state light field generating means that above-described embodiment provides, it can be realized to continuous single by frequency shifting arrangement 2
The quick frequency displacement of frequency laser, fill-in light is obtained, and the direction of propagation of laser will not be changed；Fill-in light passes through optical parametric oscillator
Obtain carrying the fill-in light of chamber information after 1, lock chamber device 4 can produce lock chamber signal according to the fill-in light for carrying chamber information, right
Optical parametric oscillator enters an actor's rendering of an operatic tune length locking, and temperature regulating device 3 can realize the accurate temperature controlling to crystal, make optical parametric oscillator
1 is operated in degeneracy state.Present arrangement avoids seed injection light or three Resonant parametric oscillators 1 three must be used to resonate
The problem of generation, the mechanical stability of optical parametric oscillator 1 is maintained, so as to obtain the squeezed vacuum state of stable output
Light field.
The laser is used to produce continuous single-frequency laser；The present invention uses a low noise single-frequency continuous wave 532nm/
For 1064nm dual lasers as lasing light emitter, a part for the laser that its medium wavelength is 1064nm is the auxiliary of horizontal polarization direction
Light is helped, a part is the simulated light of vertical polarization, and wavelength is pumping of the 532nm laser as optical parametric oscillator
Light.
The first polarized light beam splitting mirror 7, is arranged on the first emitting light path of the laser, for will be described continuous
Single-frequency laser reflexes to the optical parametric oscillator 1, obtains simulated light.Because the average light field of compression vacuum is zero, so
Using a branch of optical analog squeezed vacuum state light field is simulated with compression vacuum frequency polarization identical.
Fig. 2 is simulated light provided in an embodiment of the present invention and the resonance mode with fill-in light in optical parametric oscillator
Figure；Fig. 3 is resonance of the simulated light provided in an embodiment of the present invention with the fill-in light after frequency displacement in optical parametric oscillator chamber
Ideograph.
The frequency shifting arrangement 2, is arranged on the second emitting light path of the laser, for according to the simulated light to institute
State continuous single-frequency laser and carry out frequency displacement, obtain fill-in light.The fill-in light is transmitted through institute by the first polarized light beam splitting mirror 7
State optical parametric oscillator 1.
Specifically, as shown in Fig. 2 (b) and (c) are the fill-in light of the horizontal direction polarization that frequency displacement does not occur respectively and vertical
The simulated light of polarization direction passes through the Resonance Transmission direct current signal of optical parametric oscillator 1, although fill-in light and simulated light frequency
It is identical, but polarization can not vertically resonate simultaneously in the intracavitary of optical parametric oscillator 1, it is therefore desirable to line frequency is entered to fill-in light
Move.Signal generator 201 produces 650MHz sine wave, and the electricity of fiber coupling is loaded into after amplifying by power amplifier 202
The signal input part of optical phase modulator 203, fill-in light power after electro-optic phase modulator 203, which is transformed into, to be symmetrically distributed in
On the sideband of laser frequency both sides, realize frequency displacement, its single order sideband signals can with simulated light optical parametric oscillator 1 chamber
It is interior to resonate simultaneously.As shown in figure 3, (b) is the transmission signal of fill-in light, (c) is the transmission signal of simulated light, and (d) is fill-in light
Single order sideband signals caused by frequency displacement, (e) are the single order sideband signals of opposite side caused by auxiliary optical frequency shift.Now, extraction with
The single order sideband signals (d) that simulated light transmission signal overlaps carry out the chamber length locking of optical parametric oscillator 1.Due to simulated light with
Squeezed vacuum state light field caused by wanting, with polarizing, is used only to assist frequency shifting arrangement 2 to realize the accurate frequency displacement to fill-in light with frequency,
Therefore during squeezed vacuum state light field is produced, simulated light is kept off placement, avoids it to caused squeezed vacuum state light
Field impacts.The frequency shifting arrangement 2 provides the radiofrequency signal of a sine wave so that the frequency shift amount of sideband can be quick
Change, and the direction of propagation of light path will not be changed.
The half-wave plate 6, it is arranged on the emitting light path of the frequency shifting arrangement 2, for controlling the polarization of the fill-in light
Direction is horizontal polarization.
The optical parametric oscillator 1, it is arranged on the emitting light path of the first polarized light beam splitting mirror 7, for institute
State fill-in light to be transmitted, obtain the first transmitted light.
Specifically, the optical parametric oscillator 1 of the semi monolithic structure includes the peaceful concave mirror 202 of nonlinear crystal 101.Institute
Nonlinear crystal 101 is stated using I type-Ⅱphase matching nonlinear crystals, preferably I type-Ⅱphase matchings nonlinear crystal phosphoric acid
Oxygen titanium potassium (PPKTP) crystal.One end of the nonlinear crystal 101 is convex surface, and the other end is plane, the curvature half on the convex surface
Footpath is 12mm, and is coated with anti-reflection film (the reflectivity R to 1064nm and 532nm light<0.1%@1064nm, R<0.2%@
532nm), the concave curvature radius of the plano-concave mirror 102 is 25mm, and is coated with the part reflectance coating to 1064nm and 532nm light
(transmissivity to orthogonal polarized light is Ts=13%@1064nm, Ts>20%@532nm).The Optical Parametric of the semi monolithic structure
The amount device of oscillator 1 is simple, interior cavity loss is low, stability is high.
The fill-in light transmits from the optical parametric oscillator 1, obtains carrying the first transmitted light of chamber information,
The dichroic mirror 8 is arranged on the emitting light path of the optical parametric oscillator 1, anti-for being carried out to first transmitted light
Penetrate, obtain the first reflected light；The second polarized light beam splitting mirror 9 is arranged on the emitting light path of dichroic mirror 8, for described
First reflected light is transmitted, and obtains the second transmitted light；The lock chamber device 4, is arranged on the second polarized light beam splitting mirror 9
On emitting light path, for receiving second transmitted light；The lock chamber device 4, is connected with the optical parametric oscillator 1, uses
Locked in entering an actor's rendering of an operatic tune length to the optical parametric oscillator 1 according to second transmitted light.
Specifically, the lock chamber device 4 includes lock-in amplifier 401, proportional plus integral plus derivative controller 402, high voltage amplifier
Device 403 and photodetector 404；
The photodetector 404, it is arranged on the emitting light path of the second polarized light beam splitting mirror 9, for by described in
Second transmitted light is converted to electric signal；
The signal input part of the lock-in amplifier 401 is connected with the signal output part of the photodetector 404, described
Electric signal is realized in frequency mixer with local modulated signal in the inside of lock-in amplifier 401 and demodulated with frequency, by by after demodulation
Signal is sent into low pass filter and obtains error signal.
The error signal of the signal input part of the proportional plus integral plus derivative controller 402 and the lock-in amplifier 401 is defeated
Go out end connection, for carrying out PID control parameter to the error, obtain regulating error signal.
The signal input part of high-voltage amplifier 403 the modulated signal output end with the lock-in amplifier and institute respectively
State the signal output part connection of proportional plus integral plus derivative controller；For by the modulated signal of the lock-in amplifier and the error
Regulate signal carries out Hybrid amplifier, obtains locking chamber signal.
Be provided with piezoelectric ceramics 103 on the plano-concave mirror 102, the signal output part of the high-voltage amplifier 403 with it is described
The signal control terminal connection of piezoelectric ceramics 103.The chamber signal loading of locking is to piezoelectric ceramics 103, for changing piezoelectric ceramics
103 flexible form, so as to realize that the chamber to optical parametric oscillator 1 grows locking.The chamber of the optical parametric oscillator 1 is grown
It is locked on the resonant frequency of the fill-in light so that the stable state in not off resonance of chamber length, with the vacuum pressure that output is stable
Contracting state light field.
The continuous single-frequency laser that the laser is launched is transmitted through optical parametric oscillator 1 by dichroic mirror 8, as pump
Pu light, squeezed vacuum state light field is produced according to optical parametric oscillator 1 described in the pumping optical pumping.
Specifically, pump light is incided in optical parametric oscillator 1, into after I type-Ⅱphase matchings nonlinear crystal 101,
Accurately control crystal temperature effect to reach operating temperature by temperature regulating device 3, i.e., when crystal temperature effect is degeneracy point, optical parametric oscillator
1 inside-pumping light can produce frequencies into degeneration polarization identical signal light field and idle light field.Now, the pumping light power is controlled
When below the threshold value of the optical parametric oscillator 1, the stable squeezed vacuum state light of the output of optical parametric oscillator 1
.
The temperature regulating device 3 includes temperature controller 301, thermistor 302, Peltier element 303 and holding furnace 304.Tool
Body, the nexine of holding furnace 304 is red copper, and outer layer is polysulfone material, and the I type-Ⅱphase matchings nonlinear crystal 101 is placed on guarantor
In warm stove 304.The thermistor 302 and Peltier element 303 are both placed in holding furnace 304.Thermistor 302 is used for
The actual temperature of nonlinear crystal 101 is measured, and the actual temperature measured is sent to temperature controller 301.Temperature controller 301 is used for
The operating temperature of nonlinear crystal 101 is set, the difference of the operating temperature and actual temperature is calculated, obtains temperature gap, and
According to the temperature gap by current feedback to Peltier element 303, by controlling Peltier element 303 to nonlinear crystal
101 carry out temperature control, and temperature gap is decreased into zero, realizes the accurate temperature controlling to nonlinear crystal 101.Preferably, will be non-linear
The temperature control of crystal 101 is now optimum phase matching temperature at 45 DEG C, and optical parametric oscillator 1 is operated in degeneracy state,
During by pumping light power control below the threshold value of the optical parametric oscillator 1, the optical parametric oscillator 1 exports
Stable squeezed vacuum state light field.
Fig. 4 is the structural representation of the measurement apparatus measured to the squeezed vacuum state light field of generation；Fig. 5 fills for measurement
Put the noise bounce frequency spectrum for the squeezed vacuum state light field for detecting optical parametric oscillator output.
Such as Fig. 4, the present invention measures the vacuum pressure generated after the length locking of the chamber of optical parametric oscillator by measurement apparatus
Contracting state light field.
Quantum vacuum compressed state optical field measurement apparatus utilizes the method measurement squeezed vacuum state light field of balanced homodyne detection
Noise bounce.It is anti-that the measurement apparatus 5 includes 507, the 2nd 45 ° of signal generator 509, high-voltage amplifier 508, piezoelectric ceramics height
Mirror 506,50/50 beam splitter 501, the second photodetector 502, the 3rd photodetector 503, subtracter 504 and frequency spectrum point
Analyzer 505.High-voltage amplifier 508 is arranged on the emitting light path of signal generator 509, and the 2nd 45 ° of high reflective mirror 506 is arranged on height
On the emitting light path for pressing amplifier 508, the piezoelectric ceramics 507 is arranged on the 2nd 45 ° of high reflective mirror 506,50/50 beam splitting
Mirror 501 is arranged on the emitting light path of the 2nd 45 ° of high reflective mirror 506, the second photodetector 502 and the 3rd photodetector
503 are separately positioned in the transmission and reflected light path of 50/50 beam splitter 501, the second photodetector 502 and the 3rd light
The signal output part of electric explorer 503 connects the subtracter 504, the signal output part connection frequency of the subtracter 504 respectively
Compose analyzer 505.
Specifically, the laser part that wavelength caused by laser is 1064nm is incident to second as local oscillations light
45 ° of high reflective mirrors 506；Triangular signal is loaded into piezoelectric ceramics after high-voltage amplifier amplifies caused by signal generator 509
On 507, the phase of local oscillations light is adjusted for scanning piezoelectric ceramics 507, the local oscillations light after phase adjusted is through second
45 ° of high reflective mirrors 506 reflex to 50/50 beam splitter 501.
The squeezed vacuum state light field of the output stabilization of optical parametric oscillator 1 after the chamber length locking, the vacuum compression
State light field is reflexed on beam splitter 501 by the one 45 ° of high reflective mirror 10, and the local after squeezed vacuum state light field and phase adjusted shakes
Light is swung after the interference of 50/50 beam splitter, it is semi-transparent semi-reflecting to the second photodetector 502 and the 3rd photodetector 503, institute respectively
The AC signal for stating the second photodetector 502 and the output of the 3rd photodetector 503 is input to the frequency spectrum after subtracter
Analyzer 505, the spectrum analyzer 505 are used for the fluctuating frequency spectrum for analyzing record squeezed vacuum state light field.Squeezed vacuum state light
As shown in figure 5, curve (a) is shot noise limit, curve (b) scanning local oscillations light phase measures for the noise bounce of field
Noise result, its compression of the squeezed vacuum state light field of stable output are less than shot noise 7.2dB.
Present invention also offers a kind of squeezed vacuum state light field generation method, methods described is applied to above-mentioned squeezed vacuum state
Light field generating means.
Fig. 6 is the flow chart of squeezed vacuum state light field generation method provided in an embodiment of the present invention.It is as shown in fig. 6, described
Method includes：
Step S601：Obtain continuous single-frequency laser.
Specifically, produced using a low noise single-frequency continuous wave 532nm/1064nm dual laser as lasing light emitter
Continuous single-frequency laser.
Step S602：The continuous single-frequency laser is reflected, obtains simulated light.
Specifically, the first polarized light beam splitting mirror 7 is arranged on the first emitting light path of the laser, for by institute
State continuous single-frequency laser and reflex to the optical parametric oscillator 1, obtain simulated light.Because the average light field of compression vacuum is
Zero, so simulating optical analog squeezed vacuum state light field with compression vacuum frequency polarization identical using a branch of.
Step S603：Frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, obtains fill-in light.
Specifically include：
Obtain sine wave signal；
The sine wave signal is amplified, is amplified signal；
Frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, obtains fill-in light.
Specifically, producing 650MHz sine wave by signal generator 201, sine wave is put by power amplifier 202
The signal input part of the electric light debugger 203 of fiber coupling is loaded into after big, fill-in light power after electrooptic modulator 203 turns
Change to and be symmetrically distributed on the sideband of laser frequency both sides, realize frequency displacement, its single order sideband signals can be with simulated light in optics
The intracavitary of parametric oscillator 1 resonates simultaneously.
Step S604：The fill-in light is converted into electric signal.
Specifically, the fill-in light is transmitted through the optical parametric oscillator 1 by the first polarized light beam splitting mirror 7,
The fill-in light transmits from the optical parametric oscillator 1, obtains carrying the first transmitted light of chamber information, described double-colored
Mirror 8 is arranged on the emitting light path of the optical parametric oscillator 1, for reflecting first transmitted light, obtains
One reflected light；The second polarized light beam splitting mirror 9 is arranged on the emitting light path of dichroic mirror 8, for reflecting described first
Light is transmitted, and obtains the second transmitted light；The photodetector 404, it is arranged on the outgoing of the second polarized light beam splitting mirror 9
In light path, for second transmitted light to be converted into electric signal.
Step S605：The modulated signal of the electric signal and the lock-in amplifier is mixed, demodulation filtering, obtained
To error signal.
Specifically, the signal output part of the signal input part of the lock-in amplifier 401 and the photodetector 404 connects
Connect, the electric signal is realized in frequency mixer in the inside of lock-in amplifier 401 and local modulated signal and demodulated with frequency, by that will solve
Signal after tune is sent into low pass filter and obtains error signal.
Step S606：Proportional integration, differential control are carried out to the error signal, obtains regulating error signal.
Specifically, the error of the signal input part of the proportional plus integral plus derivative controller 402 and the lock-in amplifier 401
Signal output part connects, and for carrying out PID control parameter to the error, obtains regulating error signal.
Step S607：Hybrid amplifier is carried out to the modulated signal and the regulating error signal, obtains lock chamber signal.
Specifically, the signal input part of high-voltage amplifier 403 exports with the modulated signal of the lock-in amplifier respectively
The connection of the signal output part of end and the proportional plus integral plus derivative controller；For by the modulated signal of the lock-in amplifier and
The regulating error signal carries out Hybrid amplifier, obtains locking chamber signal.
Step S608：An actor's rendering of an operatic tune length locking is entered according to the lock chamber signal.
Specifically, piezoelectric ceramics 103 is provided with the plano-concave mirror 102, the signal output part of the high-voltage amplifier 403
It is connected with the signal control terminal of the piezoelectric ceramics 103.The chamber signal loading of locking is pressed to piezoelectric ceramics 103 for changing
The flexible form of electroceramics 103, so as to realize that the chamber to optical parametric oscillator 1 grows locking.By the optical parametric oscillator 1
Chamber length be locked on the resonant frequency of the fill-in light so that the stable state in not off resonance of chamber length, it is stable with output
Squeezed vacuum state light field.
Step S609：Produce stable squeezed vacuum state light field.
Specifically include：
Step S6091：Obtain pump light.
Specifically, the continuous single-frequency laser that the laser is launched is transmitted through optical parametric oscillator by dichroic mirror 8
1, as pump light, squeezed vacuum state light field is produced according to optical parametric oscillator 1 described in the pumping optical pumping
Step S6092：The pump light produces signal light field and idle light field by optical parametric oscillator process.
Specifically, pump light is incided in optical parametric oscillator 1, into after I type-Ⅱphase matchings nonlinear crystal 101,
Accurately control crystal temperature effect to reach operating temperature by temperature regulating device 3, i.e., when crystal temperature effect is degeneracy point, optical parametric oscillator
1 inside-pumping light can produce frequencies into degeneration polarization identical signal light field and idle light field.
Step S6093：It is degeneracy point to control the reaction temperature of the signal light field and the idle light field, while by described in
The Power Control of pump light obtains squeezed vacuum state light field below threshold value.
Specifically include：
Set the operating temperature of the signal light field and the idle light field；By the setting signal light field of temperature controller 301 and
The operating temperature of the idle light field.
Obtain the actual temperature of the signal light field and the idle light field；Non-linear crystalline substance is measured by thermistor 302
The actual temperature of body 101, so as to obtain the actual temperature of signal light field and the idle light field.
The difference of the operating temperature and the actual temperature is calculated, obtains temperature gap；Temperature controller 301 calculates the work
Make the difference of temperature and actual temperature, obtain temperature gap.
It is degeneracy point to control the reaction temperature of the signal light field and the idle light field according to the temperature gap.Temperature control
Instrument 301 according to the temperature gap by current feedback to Peltier element 303, by controlling Peltier element to nonlinear crystal
Temperature control is carried out, temperature gap is decreased to zero, realizes the accurate temperature controlling to nonlinear crystal 101, so as to control the flashlight
The reaction temperature of field and the idle light field is degeneracy point, now, the pumping light power is controlled and shaken in the optical parameter
When swinging below the threshold value of device 1, the stable squeezed vacuum state light field of the output of optical parametric oscillator 1.
Therefore, can be to optical parametric oscillator by a kind of squeezed vacuum state light field generation method provided by the invention
Enter an actor's rendering of an operatic tune length locking, obtain the squeezed vacuum state light field of stable output.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Specific case used herein is set forth to the principle and embodiment of the present invention, and above example is said
It is bright to be only intended to help the method and its core concept for understanding the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, in specific embodiments and applications there will be changes.In summary, this specification content is not
It is interpreted as limitation of the present invention.
Claims (9)
1. a kind of squeezed vacuum state light field generating means, it is characterised in that described device includes：Laser, optical parametric oscillator
It is device, frequency shifting arrangement, temperature regulating device, lock chamber device, half-wave plate, the first polarized light beam splitting mirror, the second polarized light beam splitting mirror, double-colored
Mirror；
The laser is used to produce continuous single-frequency laser；
The first polarized light beam splitting mirror, is arranged on the first emitting light path of the laser, for by the continuous single-frequency
Laser reflection obtains simulated light to the optical parametric oscillator；
The frequency shifting arrangement, be arranged on the second emitting light path of the laser, for according to the simulated light to the company
Continuous single-frequency laser carries out frequency displacement, obtains fill-in light；
The half-wave plate, it is arranged on the emitting light path of the frequency shifting arrangement, for controlling the polarization direction of the fill-in light to be
Horizontal polarization；
The fill-in light is transmitted through the optical parametric oscillator by the first polarized light beam splitting mirror；
The optical parametric oscillator, it is arranged on the emitting light path of the first polarized light beam splitting mirror, for the auxiliary
Light is transmitted, and obtains the first transmitted light；
The dichroic mirror, it is arranged on the emitting light path of the optical parametric oscillator, for being carried out to first transmitted light
Reflection, obtains the first reflected light；
The continuous single-frequency laser that the laser is launched is transmitted through the optical parametric oscillator by the dichroic mirror,
As pump light, squeezed vacuum state light field is produced according to optical parametric oscillator described in the pumping optical pumping；
The second polarized light beam splitting mirror, it is arranged on the dichroic mirror emitting light path, for being carried out to first reflected light
Transmission, obtains the second transmitted light；
The lock chamber device, is arranged on the emitting light path of the second polarized light beam splitting mirror, for receiving second transmission
Light；It is described lock chamber device, be connected with the optical parametric oscillator, for according to second transmitted light to the optical parameter
Oscillator enters an actor's rendering of an operatic tune length locking；
The temperature regulating device, it is connected with the optical parametric oscillator, for controlling the crystal in the optical parametric oscillator
Temperature.
2. device according to claim 1, it is characterised in that the frequency shifting arrangement includes signal generator, power amplification
Device, electro-optic phase modulator；
The signal generator, for producing sine wave signal；
The power amplifier, it is connected with the signal generator, for being amplified to the sine wave signal, is amplified
Signal；
The electro-optic phase modulator, it is connected with the power amplifier, is put for receiving the amplified signal, and according to described
Big signal and the simulated light carry out frequency displacement to the continuous single-frequency laser, obtain the fill-in light.
3. device according to claim 1, it is characterised in that the optical parametric oscillator includes plano-concave mirror, non-linear
Crystal；
The plano-concave mirror, is arranged on the transmitted light path of the dichroic mirror, described non-linear for the pump light to be transmitted through
The inside of crystal；
The nonlinear crystal, it is arranged on the transmitted light path of the plano-concave mirror, it is described true for being produced according to the pump light
Empty compressed state optical field；
The fill-in light is transmitted through the plano-concave mirror by the nonlinear crystal, and the fill-in light is transmitted through by the plano-concave mirror
The dichroic mirror, obtain the first transmitted light.
4. device according to claim 3, it is characterised in that the lock chamber device includes photodetector, lock mutually amplifies
Device, proportional plus integral plus derivative controller and high-voltage amplifier；
The photodetector, it is arranged on the emitting light path of the second polarized light beam splitting mirror, for described second to be transmitted
Light is converted to electric signal；
The signal input part of the lock-in amplifier is connected with the signal output part of the photodetector, for according to the electricity
Signal obtains error signal；
The signal input part of the proportional plus integral plus derivative controller is connected with the error-signal output of the lock-in amplifier, is used
It is adjusted in the error signal, obtains regulating error signal；
The signal input part of the high-voltage amplifier respectively with the modulated signal output end of the lock-in amplifier and described
The signal output part connection of proportional plus integral plus derivative controller；The high-voltage amplifier is used to believe the modulation of the lock-in amplifier
Number and the regulating error signal carry out Hybrid amplifier, obtain lock chamber signal；Piezoelectric ceramics is provided with the plano-concave mirror, it is described
The signal output part of high-voltage amplifier is connected with the signal control terminal of the piezoelectric ceramics.
5. device according to claim 3, it is characterised in that the temperature regulating device includes temperature controller, Peltier element, heat
Quick resistance and holding furnace；
The holding furnace, the outside of the nonlinear crystal is arranged on, for being incubated to the nonlinear crystal；
The thermistor, it is arranged in the holding furnace, for measuring the actual temperature of nonlinear crystal；And by the reality
Temperature is sent to the temperature controller；
The temperature controller, for setting the operating temperature of the nonlinear crystal；And calculate the actual temperature and the work
The difference of temperature, obtains temperature gap；The temperature controller controls the Peltier element according to the temperature gap；
The Peltier element, is arranged in the holding furnace, is connected with the temperature controller, for adjusting the nonlinear crystal
Temperature.
6. a kind of squeezed vacuum state light field generation method, it is characterised in that methods described is applied to one kind described in claim 1
Squeezed vacuum state light field generating means,
Methods described includes：
Obtain continuous single-frequency laser；
The continuous single-frequency laser is reflected, obtains simulated light；
Frequency displacement is carried out to the continuous single-frequency laser according to the simulated light, obtains fill-in light；
The fill-in light is converted into electric signal；
The modulated signal of the electric signal and the lock-in amplifier is mixed, demodulation filtering, obtains error signal；
Proportional integration, differential control are carried out to the error signal, obtains regulating error signal；
Hybrid amplifier is carried out to the modulated signal and the regulating error signal, obtains lock chamber signal；
An actor's rendering of an operatic tune length locking is entered according to the lock chamber signal；
Produce stable squeezed vacuum state light field.
7. according to the method for claim 6, it is characterised in that described to produce stable squeezed vacuum state light field, specific bag
Include：
Obtain pump light；
The pump light produces signal light field and idle light field by optical parametric oscillator process；
It is degeneracy point to control the reaction temperature of the signal light field and the idle light field, while by the power control of the pump light
System produces stable squeezed vacuum state light field below threshold value.
8. according to the method for claim 6, it is characterised in that it is described according to the simulated light to the continuous single-frequency laser
Frequency displacement is carried out, fill-in light is obtained, specifically includes：
Obtain sine wave signal；
The sine wave signal is amplified, is amplified signal；
Frequency displacement is carried out to the continuous single-frequency laser according to the amplified signal and the simulated light, obtains fill-in light.
9. method according to claim 7, it is characterised in that described to control the anti-of the signal light field and the idle light field
It is degeneracy point to answer temperature, is specifically included：
Set the operating temperature of the signal light field and the idle light field；
Obtain the actual temperature of the signal light field and the idle light field；
The difference of the operating temperature and the actual temperature is calculated, obtains temperature gap；
It is degeneracy point to control the reaction temperature of the signal light field and the idle light field according to the temperature gap.
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