CN102147536A - Dual-path controllable one-dimensional optic crystal lattice device - Google Patents

Abstract

The invention relates to a dual-path controllable one-dimensional optic crystal lattice device which comprises a first single-mode fiber and a second single-mode fiber, a first output lens and a second output lens, a first precision five-dimensional fiber adjusting rack and a second precision five-dimensional fiber adjusting rack, a right-angle prism, a precision four-dimensional adjusting rack, a polarizing beam splitter prism, a first aberration-eliminating balsaming lens, an L-shaped transference part, a first three-dimensional manual linear regulating platform, a second aberration-eliminating balsaming lens, a second three-dimensional manual linear regulating platform, a first electro-optic crystal, a second electro-optic crystal, a plane reflective mirror, a precision two-dimensional angle adjusting rack and an optical flat. In the device disclosed by the invention, two symmetrical optical lattice optical paths are adopted, and one plane reflective mirror is used. The device disclosed by the invention has the features: the shape of the optical crystal lattice is stable, the position, the potential well depth and the polarization status are convenient to be controlled and regulated, and the like.

Description

The one dimensional optical lattice device that two-way is controlled

Technical field

The present invention relates to Optical Lattices, the one dimensional optical lattice device that particularly a kind of two-way is controlled is used for cold atom belonging to non-linear laser spectral technique, precise laser spectral technique field as aspects such as the precision measurement of medium and quantum information controls.

Background technology

At present, Optical Lattices has become the standard set-up of cold atom opctical frequency standard and quantum modeling effort.In Optical Lattices, can obtain to have eliminated the ultraprecise spectrum of atomic motion and collision effect, thereby a kind of high stability extraneous reference frequency is provided.This technology is applied in the opctical frequency standard.Optical Lattices also is widely used in research fields such as quantum simulation, since nineteen ninety-five, the atomic gas bose einstein condensation was realized, people had utilized Bose (or Fermi) atomic gas of cold atom and quantum degeneracy successfully to simulate a large amount of electronic motion in crystals behaviors in Optical Lattices.

Usually produce Optical Lattices and be based on Principle of Standing-wave.When the 2 bundle laser stacking added-time that frequency is identical, the direction of propagation is opposite, will be the periodic intensity distribution of half-wavelength in the space generation cycle, this is the one dimensional optical lattice.When all there is such standing wave in 3 orthogonal directions, just constituted the three-dimensional optical lattice.

The control of Optical Lattices is comprised the potential well degree of depth, the translational speed of lattice, and open up aspects such as mending feature, what be easier at present realize is the control of pair potential well depth degree and translational speed.The control of pair potential well depth degree normally realizes by the control to light intensity.Normally adopt the two-beam of correlation that a little difference on the frequency is arranged to the control of Optical Lattices translational speed, just can realize control translational speed by changing difference on the frequency.But also there are some shortcomings in above method.For example, control light intensity usually and adopt acousto-optic modulator or electrooptic modulator, light intensity is not linear with control signal, therefore needs a light intensity feedback control system fast.And adopt have the certain frequency difference irradiating light beam is constituted the mobile optical lattice time, need difference on the frequency and phasic difference with stabilized two light beams.In a word, above method has all proposed higher requirement to the electronics control system.

Document description has been arranged utilized electro-optic crystal to change the polarization state of light field, realized manipulation the one dimensional optical lattice.As shown in Figure 1, among the figure: a is a linearly polarized light, and b is the cold atom cloud, and c has rotated angle θ for the linearly polarized light plane of polarization, and d is a quarter wave plate, and e is an electro-optic crystal, and f is a catoptron.Utilize catoptron to form stationary field, the electro-optic crystal between incident beam and the catoptron is used to regulate the polarization state of light field, thereby realizes the lattice displacement for different spin states.The shortcoming of this scheme is only to be applicable to the experimental design that spin state is relied on.

Summary of the invention

The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, propose the controlled one dimensional optical lattice device of a kind of two-way, this device is to realize the dexterity control of position, the potential well degree of depth, polarization state etc. to Optical Lattices.

The technology of the present invention solution is as follows:

The one dimensional optical lattice device that a kind of two-way is controlled, characteristics are that its formation comprises first single-mode fiber and second single-mode fiber, first output lens and second output lens, the first accurate five dimension fiber adjusting mounts and the second accurate five dimension fiber adjusting mounts, right-angle prism, accurate four-dimensional adjustment rack, polarization beam splitter prism, the first anaberration balsaming lens, L shaped adaptor, the first three-dimensional manually straight line is regulated platform, the second anaberration balsaming lens, the second three-dimensional manually straight line is regulated platform, first electro-optic crystal, second electro-optic crystal, plane mirror, accurate bidimensional angular setting frame and optical flat, above-mentioned position component relation is as follows:

Described L shaped adaptor is fixed on the described first three-dimensional manually straight line and regulates on the platform, and the four-dimensional adjustment rack of described precision, the first accurate five dimension fiber adjusting mounts, the second accurate five dimension fiber adjusting mounts, right-angle prism, polarization beam splitter prism, the first anaberration balsaming lens place on the described L shaped adaptor;

The described second anaberration balsaming lens, plane mirror, bidimensional angular setting frame, first electro-optic crystal, second electro-optic crystal all place on the described optical flat;

Three parts on described L shaped adaptor is provided with the four-dimensional adjustment rack of described precision in a triangle, the first accurate five dimension fiber adjusting mounts and the second accurate five dimension fiber adjusting mounts, the inclined-plane gluing of described right-angle prism is on the side of the four-dimensional adjustment rack of described precision, described first output lens and second output lens are separately fixed on the described first accurate five dimension fiber adjusting mounts and the second accurate five dimension fiber adjusting mounts and relatively place, the laser of described first single-mode fiber and the output of second single-mode fiber is exported first light beam and second light beam that is parallel to each other along the drift angle direction again through described first output lens and second output lens respectively after the two right-angle sides reflection of described right-angle prism, drift angle direction at the right angle of described right-angle prism is polarization beam splitter prism successively, the first anaberration balsaming lens, the second anaberration balsaming lens, plane mirror and bidimensional angular setting frame, described plane mirror is located on the described bidimensional angular setting frame, so that the precision adjustment of the reflecting surface of described plane mirror 17, described first electro-optic crystal and second electro-optic crystal place between described second anaberration balsaming lens and the plane mirror and lay respectively on the light path of described second light beam and first light beam, apply driving voltage on described first electro-optic crystal and second electro-optic crystal.

Two right angle face angles of described right-angle prism depart from 90 degree and are not more than 10 seconds, and two right angle faces all are coated with the high reflectance deielectric-coating at used optical maser wavelength.

Export almost completely relative and parallel two light beams with second single-mode fiber through first output lens and the coupling of second output lens from first single-mode fiber.After being reflected by right-angle prism, this two bundles parallel beam is parallel to each other along the drift angle direction output of right-angle prism.Rise partially through polarization beam splitter prism then, again through the first anaberration balsaming lens, behind these lens distance A place (near the focus), two-beam will be assembled, and convergent point overlaps.Within the segment distance, two-beam is the part crossover still, becomes the light beam of dispersing afterwards again before and after convergent point, and through behind the second anaberration balsaming lens, the light beam of dispersing becomes parallel beam again again, and this two parallel beams light is parallel to each other.This 2 bundle parallel beam is respectively through first electro-optic crystal and second electro-optic crystal, and then incide on the plane mirror, returned along former road by the plane mirror beam reflected, once more through first electro-optic crystal and second electro-optic crystal and the second anaberration balsaming lens.2 bundle reflected light form stationary field with the light beam of original incident respectively, produce Optical Lattices.

The controlling party ratio juris of described Optical Lattices is as follows:

The one dimensional optical lattice can produce by stationary field, and in the present invention, the potential field of Optical Lattices can be described as:

$V(r,x)=-V_{\mathrm{lat}}\&CenterDot;e^{-2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000449326800012.png"\; state="\{\{state\}\}">r</figure-callout>}}^2/w_0^2}\&CenterDot;{\sin }^2\left(\mathrm{kx}\right)\&ap;-V_{\mathrm{lat}}\&CenterDot;(1-2\frac{r^2}{w_0^2})\&CenterDot;{\sin }^2\left(\mathrm{kx}\right)---\left(1\right)$

In the formula: w ₀Be the with a tight waist of incident laser light beam, k=2 π/λ is the absolute value of laser wave vector, r be on the yz plane with respect to the distance of optical axis, x is the relative optical length with respect to plane mirror, V _LatBe the degree of depth of Optical Lattices, often with recoil energy as the E of unit _r=η ²k ²/ 2m.For big off resonance situation, the lattice degree of depth of Optical Lattices can be expressed as:

$V_{\mathrm{lat}}=\frac{3\mathrm{\&pi;}{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HSA00000449326800012.png"\; state="\{\{state\}\}">c</figure-callout>}}^2}{2{\mathrm{\&omega;}}_0^3}\&CenterDot;\frac{\mathrm{\&Gamma;}}{\mathrm{\&Delta;}}\&CenterDot;\frac{2P}{\mathrm{\&pi;}{w}_0^2}---\left(2\right)$

Wherein: m is an atomic mass, and c is the light velocity, ω ₀Be the frequency of atomic transition, Δ is that laser frequency is with respect to ω ₀The off resonance amount, Γ is the live width of atomic transition.P is the luminous power maximal value in the Optical Lattices, is 4 times of incident row glistening light of waves field power, Be exactly optical power density (light intensity) I.Therefore, regulate the lattice degree of depth that laser intensity just can be regulated Optical Lattices.Secondly, x is the relative optical length with respect to plane mirror, by regulating the voltage that applies on the electro-optic crystal, can regulate the light path (being the x value) of the same space position with respect to plane mirror, thereby changes the position of Optical Lattices lattice point.

Among the present invention, 2 cover Optical Lattices are superimposed at the focus place, and the Optical Lattices potential field can be described as:

$V(r,x)\&ap;-(1-2\frac{r^2}{w_0^2})(V_1\&CenterDot;{\sin }^2\left(k_1{x}_1\right)-{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000449326800012.png"\; state="\{\{state\}\}">V</figure-callout>}}_2\&CenterDot;{\sin }^2\left(k_2{x}_2\right))---\left(3\right)$

Wherein: V ₁And V ₂Be respectively the 1st cover Optical Lattices and the 2nd cover Optical Lattices the lattice degree of depth (suppose two-beam respectively the relative atom transition be respectively positive off resonance and negative off resonance, so write as the form of subtracting each other), can regulate by changing two light intensity of restrainting laser; k ₁And k ₂It is respectively the wave vector of the 1st cover Optical Lattices and the 2nd cover Optical Lattices; x ₁And x ₂Be respectively that the 1st cover Optical Lattices is overlapped the relative optical length that Optical Lattices is ordered at x with the 2nd.

We do following important being similar to then: at first, (cold atom group) is in beam center for interaction medium, and r is taken as zero; Make V ₁=V ₂=V is because k ₁With k ₂Very approaching, for interior (being generally less than 5mm) among a small circle at interaction medium place, we can make k approx ₁=k ₂=k, sum up in the point that with the influence that optical length causes on the phase factor, formula (3) can be written as like this:

So can change phase factor by regulating the voltage that applies on first electro-optic crystal and second electro-optic crystal With

When

During variation, the potential well degree of depth of total Optical Lattices also just changes thereupon.If keep

Constant, promptly

With

Change synchronously, then constant the but lattice point of the potential well degree of depth of Optical Lattices can move.

If independently change V ₁And V ₂, can also regulate more flexibly Optical Lattices.

Advantage of the present invention:

Among the present invention, the light path symmetry of two cover Optical Lattices, and use same plane mirror.This makes that the shape of the Optical Lattices that final stack forms is highly stable, is subjected to the influence of mechanical vibration or environment temperature very little.Because the length of two blocks of electro-optic crystals is identical, and is placed on very approaching position, so the phase drift that produces because of temperature variation can be ignored.

Description of drawings

Fig. 1 is that the electro-optic crystal of mentioning in the existing literature 1 that utilizes changes the polarization state of light field, the scheme that the one dimensional optical lattice is handled.

Fig. 2 is the light channel structure synoptic diagram of the controlled one dimensional optical lattice device of two-way of the present invention.

Fig. 3 is the high pressure amplifying circuit schematic diagram that is used to control electro-optic crystal in the one embodiment of the invention.

Embodiment

The present invention is further described below in conjunction with drawings and Examples.But should not limit protection scope of the present invention with this.

See also Fig. 2 earlier, Fig. 2 is the light channel structure synoptic diagram of the controlled one dimensional optical lattice device of two-way of the present invention.As seen from the figure, the formation of the one dimensional optical lattice device that two-way of the present invention is controlled comprises first single-mode fiber 1 and second single-mode fiber 2, first output lens 3 and second output lens 4, the first accurate five dimension fiber adjusting mounts 5 and the second accurate five dimension fiber adjusting mounts 6, right-angle prism 7, accurate four-dimensional adjustment rack 8, polarization beam splitter prism 9, the first anaberration balsaming lens 10, L shaped adaptor 11, the first three-dimensional manually straight lines are regulated platform 12, the second anaberration balsaming lenss 13, the second three-dimensional manually straight line is regulated platform 14, first electro-optic crystal, 15, the second electro-optic crystals 16, plane mirror 17, accurate bidimensional angular setting frame 18 and optical flat 19, above-mentioned position component relation is as follows:

Described L shaped adaptor 11 is fixed on the described first three-dimensional manually straight line and regulates on the platform 12, and four-dimensional adjustment rack 8, first accurate five dimension fiber adjusting mounts, 5, the second accurate five dimension fiber adjusting mounts 6 of described precision, described right-angle prism 7, polarization beam splitter prism 9, the first anaberration balsaming lens 10 place on the described L shaped adaptor 11;

The described second anaberration balsaming lens 13, plane mirror 17, bidimensional angular setting frame 18, first electro-optic crystal 15 and second electro-optic crystal 16 all place on the described optical flat 19;

Three parts on described L shaped adaptor 11 is provided with the four-dimensional adjustment rack 8 of described precision in a triangle, the first accurate five dimension fiber adjusting mounts 5 and the second accurate five dimension fiber adjusting mounts 6, the inclined-plane gluing of described right-angle prism 7 is on the side of the four-dimensional adjustment rack 8 of described precision, described first output lens 3 and second output lens 4 are separately fixed on the described first accurate five dimension fiber adjusting mounts 5 and the second accurate five dimension fiber adjusting mounts 6 and relatively place, the laser of described first single-mode fiber 1 and 2 outputs of second single-mode fiber is exported first light beam and second light beam that is parallel to each other along the drift angle direction again through described first output lens 3 and second output lens 4 respectively after the two right-angle sides reflection of described right-angle prism 7, drift angle direction at the right angle of described right-angle prism 7 is polarization beam splitter prism 9 successively, the first anaberration balsaming lens 10, the second anaberration balsaming lens 13, plane mirror 17 and bidimensional angular setting frame 18, described plane mirror 17 is located on the described bidimensional angular setting frame 18, so that the precision adjustment of the reflecting surface of described plane mirror 17, described first electro-optic crystal 15 and second electro-optic crystal 16 place between described second anaberration balsaming lens 13 and the plane mirror 17 and lay respectively on the light path of described second light beam and first light beam, apply driving voltage on described first electro-optic crystal 15 and second electro-optic crystal 16.

Two right angle face angles of described right-angle prism depart from 90 degree and are not more than 10 seconds, and two right angle faces all are coated with the high reflectance deielectric-coating at used optical maser wavelength.

Export two almost completely relative and parallel light beams from 2 single-mode fibers through first output lens 3 and 4 couplings of second output lens.This two bundles parallel beam is parallel to each other along the drift angle direction output of right-angle prism 7 after being reflected by right-angle prism 7.Again through the first anaberration balsaming lens 10, behind these lens distance A place (near the focus), two-beam will be assembled partially to pass through 9 of polarization beam splitter prisms then, and convergent point overlaps.Within the segment distance, two-beam is the part crossover still before and after convergent point.Afterwards, pass through distance A again, place the second anaberration balsaming lens 13.Behind the second anaberration balsaming lens 13, the light beam of dispersing becomes parallel beam again, and this two parallel beams light is parallel to each other.This 2 bundle parallel beam is respectively through first electro-optic crystal 15 and second electro-optic crystal 16, and then incide on the plane mirror 17, returned along former road by plane mirror 17 beam reflected, once more through first electro-optic crystal 15 and second electro-optic crystal 16 and the second anaberration balsaming lens 13.2 bundle reflected light form stationary field with the light beam of original incident respectively.We are also inequality from the frequency of the laser of 2 optical fiber outputs, and they can also can use acousto-optic modulator that 2 bundle laser frequencies are differed about 100MHz from same laser instrument from the laser instrument of 2 platform independent.Therefore, can't form the Optical Lattices structure between the different light of this 2 bundle frequency, the stationary field that they form separately through the plane reflection mirror reflection is separate.The position phase of Optical Lattices (for example being to be in crest or antinode) somewhere is by 17 effective light path and Wavelength of Laser decision from this to plane mirror.

In apparatus of the present invention, 2 bundle Wavelength of Laser stable (this can by general Frequency Stabilization Technique realization) are so Optical Lattices only is subjected to the influence of effective light path separately.Therefore, we can be added in the contraposition phase mutually that first electro-optic crystal 15 and the voltage on second electro-optic crystal 16 are regulated 2 cover Optical Lattices by changing respectively.It is separate that this 2 cover Optical Lattices is mentioned in the front, is intensity addition.Therefore, we can restraint the intensity of laser and be added on 2 voltages on the electro-optic crystal by regulating 2, and the important parameters such as well depth, position and translational speed of control Optical Lattices are realized sensitive manipulation.

The concrete controlling party ratio juris of well depth, position and translational speed of control Optical Lattices is as follows:

The one dimensional optical lattice can be by the generation of stationary field, and in the present invention, the potential field of Optical Lattices can be described as:

$V(r,x)=-V_{\mathrm{lat}}\&CenterDot;e^{-2{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HSA00000449326800012.png"\; state="\{\{state\}\}">r</figure-callout>}}^2/w_0^2}\&CenterDot;{\sin }^2\left(\mathrm{kx}\right)\&ap;-V_{\mathrm{lat}}\&CenterDot;(1-2\frac{r^2}{w_0^2})\&CenterDot;{\sin }^2\left(\mathrm{kx}\right)$

Here w ₀Be the with a tight waist of incident laser light beam, k=2 π/λ is the absolute value of laser wave vector, and r is with respect to the distance of optical axis on the yz plane.V _LatBe the degree of depth of Optical Lattices, often with recoil energy as the E of unit _r=η ²k ²/ 2m.For big off resonance situation, the lattice degree of depth of Optical Lattices can be expressed as:

$V_{\mathrm{lat}}=\frac{3\mathrm{\&pi;}{\mathrm{<figure-callout\; id="2"\; label="c"\; filenames="HSA00000449326800012.png"\; state="\{\{state\}\}">c</figure-callout>}}^2}{2{\mathrm{\&omega;}}_0^3}\&CenterDot;\frac{\mathrm{\&Gamma;}}{\mathrm{\&Delta;}}\&CenterDot;\frac{2P}{\mathrm{\&pi;}{w}_0^2}$

Wherein: m is an atomic mass, and c is the light velocity, ω ₀Be the frequency of atomic transition, Δ is that laser frequency is with respect to ω ₀The off resonance amount, Γ is the live width of atomic transition.P is the luminous power maximal value in the Optical Lattices, is 4 times of incident row glistening light of waves field power,

Be exactly optical power density (light intensity) I.Therefore, regulate the lattice degree of depth that laser intensity just can be regulated Optical Lattices.Secondly, x is the relative optical length with respect to plane mirror, by regulating the voltage that applies on the electro-optic crystal, can regulate the light path (being the x value) of the same space position with respect to plane mirror, thereby changes the position of Optical Lattices lattice point.

Among the present invention, 2 cover Optical Lattices are superimposed at the focus place, and the Optical Lattices potential field can be described as:

$V(r,x)\&ap;-(1-2\frac{r^2}{w_0^2})(V_1\&CenterDot;{\sin }^2\left(k_1{x}_1\right)-{\mathrm{<figure-callout\; id="2"\; label="V"\; filenames="HSA00000449326800012.png"\; state="\{\{state\}\}">V</figure-callout>}}_2\&CenterDot;{\sin }^2\left(k_2{x}_2\right))$

Wherein: V ₁And V ₂Be respectively the lattice degree of depth of the 1st cover Optical Lattices and the 2nd cover Optical Lattices, can regulate by the light intensity that changes two bundle laser; k ₁And k ₂It is respectively the wave vector of the 1st cover Optical Lattices and the 2nd cover Optical Lattices; x ₁And x ₂Be respectively that the 1st cover Optical Lattices is overlapped the relative optical length that Optical Lattices is ordered at x with the 2nd, can regulate by first electro-optic crystal and second electro-optic crystal.

Fig. 2 also is an embodiments of the invention light path synoptic diagram, among the figure:

First single-mode fiber 1 and second single-mode fiber 2 (adopting the 780HP of ThorLabs company) connect first output lens 3 and second output lens 4 (F230FC-B of ThorLabs company) respectively, 2 output lens are fixed in respectively on the first accurate five dimension fiber adjusting mounts 5 and the second accurate five dimension fiber adjusting mounts 6 (OM-TZ-112 of Shanghai friendship ties), staggered relatively, the middle about 2cm. of distance can be coupled to other 1 optical fiber from the light of wherein 1 optical fiber output, coupling efficiency requires to be higher than 80%, can guarantee like this to be parallel to each other basically after this two-beam is by right-angle prism 7 reflections.2 right angle face angles of right-angle prism depart from 90 degree and are not more than 10 seconds, and 2 right angle faces all are coated with the high reflectance deielectric-coating at used optical maser wavelength.The inclined-plane of right-angle prism 7 is cemented on the side of accurate four-dimensional adjustment rack 8 (OM-TZ-109 of Shanghai friendship ties).Adjust the position of this four-dimensional adjustment rack, make that spacing is about the angle that 8mm. regulates four-dimensional adjustment rack 8 between the parallel beam of right-angle prism 7 reflection, make reflected light maintenance level, and be vertical with two optical fiber head line directions.Inclined to one side through 9 of polarization beam splitter prisms then, polarization beam splitter prism 9 can be selected existing goods (as 0BPS20-0608 of the Chinese light of standing upright) for use.Light beam is through the first anaberration balsaming lens 10 afterwards, adopts in our trial-production voluntarily that the focal length of Design and Machining is the anaberration lens of 400mm, also can adopt commodity (as the AC508-400-B of ThorLabs company) in the enforcement.

The light path set-up procedure is as follows:

When adjusting light path, pass from the core of lens in order to guarantee 2 light beams, adopt following method.Place the approximate location that lens find the focal plane earlier, place a white screen at this.Remove lens then, on screen, mark out the position of two luminous points.Reappose lens again,, make the hot spot of two coincidences after the focusing be positioned at the centers of two mark point lines on the screen by regulating the position up and down of lens.Aforementioned each optical element and relevant optical bench all are fixed on the plane of a L shaped adaptor (11), 6 (2 rows are arranged on another plane of this adaptor, 3 of every rows) diameter is the through hole of 6.5mm, pitch of holes is 25mm, and this simultaneously is fixed on three-dimensional manually straight line and regulates on the platform 12 (ALB-XYZ-75-1XL of Shanghai friendship ties).

Next procedure is to regulate overlapping between focal beam spot and the interaction medium (cold atom cloud or Bose-Einstein condensation body), and this can finish by the absorption imaging method of standard.Light beam will be by the second anaberration lens 13 then, and the parameter of these lens and the first anaberration lens 10 is identical.The second anaberration lens 13 are fixed on the second three-dimensional manually straight line and regulate on the platform 14 (ALB-XYZ-6.2-2XW of Shanghai friendship ties), and should regulate platform 14 and all optical benchs that install right half part by the manual straight line of three-dimensional, all be fixed on the optical flat 19 of attacking 6mm Luo hole, can process voluntarily, also can adopt commodity (as the OM-SP-13 of Shanghai friendship ties).Regulate platform 14 by regulating the second three-dimensional manually straight line, make the light beam that passes the second anaberration lens 13 become parallel beam once more.In order to check light beam whether to collimate, can measure the degree of divergence of hot spot and the distance between two hot spots at (beyond 2 meters) at a distance.Place the plane mirror 17 that is fixed on the described accurate bidimensional angular setting frame 18 (AS-OM-41-62 of Shanghai friendship ties) at the about 400mm in the rear of the second anaberration lens 13 place, light beam is returned along former road with it.Reflected light can be got back in the optical fiber when light path collimated fully, otherwise needed to continue the angle of accommodation reflex mirror.If two-beam can not be got back in two optical fiber simultaneously, then need to finely tune the front and back position of the second anaberration lens 13, and then the angle of leveling face catoptron 17.Be to insert first electro-optic crystal, 15 second electro-optic crystals 16 respectively in the light path of first light beam between the second anaberration lens 13 and plane mirror 17 and second light beam at last, make 2 light beams pass the central shaft of first electro-optic crystal, 15 second electro-optic crystals 16 respectively.The front and back position of first electro-optic crystal, 15 second electro-optic crystals 16 differs 5cm, and this is in order to prevent that electric field separately from influencing each other.Crystalline material can be selected lithium niobate for use, adopts x to cut, and size is x: y: z=32: 4: 2mm, x tangent plane are transparent surface, and the z tangent plane is a gold-plated electrode, and point is welded with lead on it.Crystal is placed on the anchor clamps of making of insulating material (as teflon), and the self-control shell, places on the optical bench then.Adjusting position makes light beam pass through from the axle center.Notice electric field that polarization beam splitter prism 9 makes transmitted light along the y direction, the changing into of refractive index γ wherein ₁₃=8.6 * 10 ^-12M/V, n ₀=2.341, half-wave voltage is about 453 volts.From the simulating signal card of computing machine or from the general Vpp of voltage of signal generator output waveform＜10 volts, be enough to drive electro-optic crystal in order to make voltage, need add a high-voltage amplifier in the back.Can select commercial high-voltage amplifier for use, but we recommend to adopt high pressure to amplify the high pressure amplifying circuit of chip PA85, circuit diagram as shown in Figure 3, D1, D2, D3, D4 are diode (IN1412) among the figure.R1 resistance (3K Ω), R2 resistance (177K Ω), R3 resistance (180K Ω), R4 resistance (6K Ω), R5 resistance (464 Ω), R6 resistance (330 Ω).C1 electric capacity (47pF, withstand voltage 400V), C2 electric capacity (0.1 μ F), C3 electric capacity (0.1 μ F), C4 electric capacity (0.1 μ F, withstand voltage 400V), C5 electrochemical capacitor (47 μ F, withstand voltage 400V), C6 electric capacity (47pF, withstand voltage 400V), C7 electric capacity (0.1 μ F), C8 electrochemical capacitor (47 μ F), C7 electric capacity (10pF).The equal ground connection of the negative pole of input and output side.

Adopt this drives monolithic crystal, can realize moving in the 1 μ s 0.75 optics lattice point.Adopt two cover circuit to drive (the gold-plated electrode direction of noting two crystal should be just in time opposite) simultaneously, can obtain to move the effect of 1.5 optics lattice points.Because the length of two crystal is identical, is placed on very approaching position, so the phase drift that produces because of temperature variation can be ignored.

Claims (2)

1. one dimensional optical lattice device that two-way is controlled, be characterised in that its formation comprises first single-mode fiber (1) and second single-mode fiber (2), first output lens (3) and second output lens (4), the first accurate five dimension fiber adjusting mounts (5) and the second accurate five dimension fiber adjusting mounts (6), right-angle prism (7), accurate four-dimensional adjustment rack (8), polarization beam splitter prism (9), the first anaberration balsaming lens (10), L shaped adaptor (11), the first three-dimensional manually straight line is regulated platform (12), the second anaberration balsaming lens (13), the second three-dimensional manually straight line is regulated platform (14), first electro-optic crystal (15), second electro-optic crystal (16), plane mirror (17), accurate bidimensional angular setting frame (18) and optical flat (19), above-mentioned position component relation is as follows:

Described L shaped adaptor (11) is fixed on the described first three-dimensional manually straight line and regulates on the platform (12), and the four-dimensional adjustment rack of described precision (8), the first accurate five dimension fiber adjusting mounts (5), the second accurate five dimension fiber adjusting mounts (6), described right-angle prism (7), polarization beam splitter prism (9), the first anaberration balsaming lens (10) place on the described L shaped adaptor (11);

The described second anaberration balsaming lens (13), plane mirror (17) and bidimensional angular setting frame (18), described first electro-optic crystal (15) and second electro-optic crystal (16) all place on the described optical flat (19);

Three parts on described L shaped adaptor (11) is provided with the four-dimensional adjustment rack of described precision (8) in a triangle, the first accurate five dimension fiber adjusting mounts (5) and the second accurate five dimension fiber adjusting mounts (6), the inclined-plane gluing of described right-angle prism (7) is on the side of the four-dimensional adjustment rack of described precision (8), described first output lens (3) and second output lens (4) are separately fixed at the described first accurate five dimension fiber adjusting mounts (5) and the second accurate five dimension fiber adjusting mounts (6) are gone up and relatively placed, the laser of described first single-mode fiber (1) and second single-mode fiber (2) output is exported first light beam and second light beam that is parallel to each other along the drift angle direction again through described first output lens (3) and second output lens (4) respectively after the two right-angle sides reflection of described right-angle prism (7), drift angle direction at the right angle of described right-angle prism (7) is polarization beam splitter prism (9) successively, the first anaberration balsaming lens (10), the second anaberration balsaming lens (13), plane mirror (17) and bidimensional angular setting frame (18), described plane mirror (17) is located on the described bidimensional angular setting frame (18), so that the precision adjustment of the reflecting surface of described plane mirror (17), described first electro-optic crystal (15) and second electro-optic crystal (16) place between described second anaberration balsaming lens (13) and the plane mirror (17) and lay respectively on the light path of described second light beam and first light beam, apply driving voltage on described first electro-optic crystal (15) and second electro-optic crystal (16).

2. the one dimensional optical lattice device that two-way according to claim 1 is controlled, the two right angle face angles that it is characterized in that described right-angle prism depart from 90 degree and are not more than 10 seconds, and two right angle faces all are coated with the high reflectance deielectric-coating at used optical maser wavelength.

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