CN104076574B - Optical image enhancement device and method - Google Patents
Optical image enhancement device and method Download PDFInfo
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- CN104076574B CN104076574B CN201310108408.6A CN201310108408A CN104076574B CN 104076574 B CN104076574 B CN 104076574B CN 201310108408 A CN201310108408 A CN 201310108408A CN 104076574 B CN104076574 B CN 104076574B
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Abstract
The invention provides an optical parameter image enhancement device based on quasi-phase matching. A signal light laser transmitting and receiving module (1) is used for generating and transmitting signal light laser and receiving an image signal returned from an imaging object (0). A synchronous control module (2) is used for controlling a pump laser module (3) to allow pump laser and the image signal to pass a signal light and pump light coupling module (4) at the same time and to enter a quasi-phase matching frequency-changer crystal and regulating module (5). The quasi-phase matching frequency-changer crystal and regulating module (5) is used for allowing the pump light and the image signal to engage in quasi-phase matching. An output image is an enhanced signal light image and/or a newly-generated conjugated idling-frequency light image. The characteristic of maximum nonlinear coefficient of a nonlinear medium is made full use by quasi-phase matching, gain of the optical image is significantly improved, and detection of weak image signals is favored.
Description
Technical field
The present invention relates to optical imagery amplifying technique field, more particularly, to a kind of optical imagery intensifier and method.
Background technology
Optical parameter image enhancement technique as optically erasing (Optical Parametric Amplification,
OPA) important application a direction of technology, with its high optical gain, split-second precision gating, can achieve frequency upooaversion etc.
Advantage, in laboratory biological, medical science, chemical analyses with aspects such as ultrafast imaging process researchs achieved with important application；Exist simultaneously
Laser radar, optical remote sensing, quantum imaging also have major application and are worth.
At present, optical parameter image intensifier device, all realizes the phase of flashlight and pump light using conventional phase matching technique
Position coupling, and the conventional phase matching technique with critical phase matched as representative, due to phase-matching condition have to strict
Angle or temperature conditionss are issued to, therefore can not be applied to the maximum nonlinear factor in crystal second-order tensor.With ktp crystal it is
Example, in its second-order tensor, maximum nonlinear factor is d33, about 16.0pm/V, and KTP can only use in 1064nm laser freuqency doubling
Effective nonlinear coefficient but only have the shortcomings of d24=3.64pm/V and d15=1.91pm/V, low effective nonlinear coefficient,
Being embodied in optical parameter image enhaucament aspect is to need strong pumping light intensity or longer nonlinear crystal to obtain high image
Gain.If can use d33 in frequency conversion, conversion efficiency can have the lifting of magnitude.Additionally, in existing phase matched scheme
The impact of birefringence walk-off effect cannot be avoided, thus limiting nonlinear crystal length and the enhanced space uniform of optical imagery
Property.Meanwhile, due to the restriction of receiving angle bandwidth, image high fdrequency component cannot be carried out effectively strengthening, and so makes routine
The resolution of phase matched relatively low it is difficult to ensure weak image signal strengthen after signal to noise ratio.
Quasi-phase matched (Quasi-Phase match, QPM) technology early in 1962 just by Armstrong and
Bloembergen etc. proposes, its phase during utilizing periodic polarized crystal to provide suitable reciprocal lattice vector to compensate three couple waves
Position amount of mismatch, makes three couple waves conversion efficiency be increased dramatically.Because the restriction of technique at that time is it is impossible to prepare available
Crystal.Since the nineties in 20th century, with the continuous progress of material science and optical manufacturing, QPM technology starts to obtain in an experiment
To application.In recent years, trichromatic laser is realized using QPM technology, have become as laser miniaturization and practical weight
Want developing direction.But not yet there is the report of the image enhaucament based on QPM at present.
Content of the invention
(1) technical problem
The problem to be solved in the present invention be optically erasing (OPA) optical imagery strengthen in lateral resolution poor, by
Limit in power density and can only operate in psec with short Pump duration.
(2) technical scheme
The present invention provides a kind of optical parameter image intensifier device, and this device includes flashlight Laser emission and receiver module
(1), synchronization control module (2), pumping laser module (3), flashlight and coupling pump light module (4), quasi-phase matched frequency conversion
Crystal and its adjustment module (5), picture signal selecting module (6) and image-forming module (7), wherein：
Flashlight Laser emission and receiver module (1), for producing, transmission signal ray laser, and receive from imageable target
(0) picture signal returning；
Synchronization control module (2), for controlling pumping laser module (3), makes pumping laser with described image signal simultaneously
Through flashlight and coupling pump light module (4), subsequently into quasi-phase matched frequency-changer crystal and its adjustment module (5)；
Quasi-phase matched frequency-changer crystal and its adjustment module (5), are used for making pump light, with picture signal light, quasi- phase place occur
Coupling, realizes the energy coupling between flashlight, pump light and the conjugation ideler frequency light three corresponding with signal light frequency, through it
The picture signal of output includes enhanced signal light image, and in three wave energy coupling process new producing with signal optical frequency
The corresponding ideler frequency light image of rate.
Optionally, this device also includes:
Picture signal selecting module (6), is imaged microscope group by the pump light setting gradually with flashlight separation coupling mirror (600)
(601) light beam accumulation device (603) composition of the pump light and after narrow band filter slice (602) and collection separation, for selecting
State picture signal light or ideler frequency light, realize it simultaneously and separate with pump light.
Image-forming module (7), is made up of imaging photosensitive element (700), photodetector and equipment for reconstructing image, by itself
Clock control or by synchronization control module (2) trigger, for as needed, becoming to selected flashlight or ideler frequency light
Picture.
Optionally, described quasi-phase matched frequency-changer crystal and its adjustment module (5) include：Periodic polarized crystal (500)
With temperature control element (501), described periodic polarized crystal (500) and temperature control element (501) are used for carrying out quasi-phase matched.
Optionally, described quasi-phase matched frequency-changer crystal and adjustment module (5) also include：Propagate light path along optical imagery to set
Imaging regulating element (502), level and vertical position regulating element (503), crystal pitching and the angle of oscillation regulating element put
(504).
Described quasi-phase matched frequency-changer crystal and its adjustment module (5) are directly realized by the optically erasing of flashlight, and/or
Realize the frequency upooaversion of flashlight using the ideler frequency light producing during optical parameter and flashlight is conjugated.
Optionally, described flashlight Laser emission is included with receiver module (1)：Swash along the flashlight that light path sets gradually
Light device (100), signal photocell (101), signal light receiving element (102).
Optionally, described pumping laser module (3) includes：Pumping light laser (300), pump light shaping element
(301) and for by the pumping light transmission component (302) of pumping optical transport to quasi-phase matched frequency-changer crystal surface.
Optionally, described signal light laser (100) is two different laser instrument from pumping light laser (300), or
To be there is provided by the fundamental frequency output and the output through being converted on non-linear frequency for its fundamental frequency of same laser instrument respectively, the two it
Between electricity timing synchronization control to be realized by synchronization control module (2).
Optionally, described synchronization control module (2) specifically includes：Electricity time-delay mechanism (200) and/or optical delay dress
Put, wherein electricity time-delay mechanism (200) passes through trigger control signal light laser (100) and pumping light laser (300)
Launch time, make pumping photoemissive time delay equal with receiving the time experienced with flashlight transmitting, described optics prolongs
Device specifically includes reflecting element (201) and optical translation platform (202) late, is used for realizing the time between flashlight and pump light
Synchronous fine setting.
Electrical delay device can independently be used with optical delay device, also can be used in combination.Prolonged by above-mentioned electricity
Device (200) makes flashlight and pump light synchronous in time by electrical delay mode late, and passes through above-mentioned optical delay
The light path of device control signal light and pump light so that flashlight and pump light are synchronous in time so that flashlight with
Pumping laser is synchronous in time, can be used alone electrical delay device (200) or optical delay device, electricity also can be used in combination
Learn deferred mount (200) and optical delay device.
The present invention also provides a kind of optical parameter image enchancing method, and the method includes：
Generation, transmission signal ray laser, and receive the picture signal returning from imageable target (0), so that picture signal is imaged
To on quasi-phase matched frequency-changer crystal；
Control transmitting pumping laser, and it is brilliant to make pumping laser and described image signal synchronously arrive at quasi-phase matched frequency conversion
Body；
Adjust crystal parameter, make pump light realize coupling of energy with picture signal light by quasi-phase matched, through quasi- phase
Picture signal after the coupling of position includes enhanced signal light image, and the ideler frequency light image corresponding with signal light frequency.
(3) technique effect
The present invention makes full use of the feature of the maximum nonlinear factor of nonlinear dielectric by quasi-phase matched, is obviously improved
The gain of optical imagery, contributes to the detection to weak image signal.
Brief description
Fig. 1 is the structure chart of optical parameter image intensifier device proposed by the present invention；
Fig. 2 is a kind of flow chart of optical parameter image enchancing method proposed by the present invention；
Fig. 3 is the flow chart of another kind optical parameter image enchancing method proposed by the present invention；
Fig. 4 is the structure chart of quasi-phase matched frequency-changer crystal and its adjustment module (5)；
Fig. 5 is the structure chart of flashlight Laser emission and receiver module (1)；
Fig. 6 is a kind of light of quasi-phase matched being 532nm for 355nm and flashlight for pump light proposed by the present invention
Learn the device of image enhaucament；
Fig. 7 be proposed by the present invention a kind of be the quasi-phase matched that 355nm and flashlight are 1064nm for pump light
The enhanced device of optical imagery；
Fig. 8 be proposed by the present invention a kind of be the quasi-phase matched that 532nm and flashlight are 1550nm for pump light
The enhanced device of optical imagery.
Specific embodiment
Embodiment 1
As shown in figure 1, the present invention provides a kind of optical parameter image intensifier device, this device includes flashlight Laser emission mould
Block (1a) and flashlight laser pick-off module (1b), described flashlight laser emitting module (1a) and flashlight laser pick-off module
(1b) composition flashlight Laser emission and receiver module (1), synchronization control module (2), pumping laser module (3), flashlight with
Coupling pump light module (4), quasi-phase matched frequency-changer crystal and its adjustment module (5), picture signal selecting module (6) and one-tenth
Picture module (7), wherein：
Flashlight Laser emission and receiver module (1), for producing, transmission signal ray laser, and receive from imageable target
(0) picture signal returning；
Synchronization control module (2), for controlling pumping laser module (3), makes pumping laser with described image signal simultaneously
Through flashlight and coupling pump light module (4), subsequently into quasi-phase matched frequency-changer crystal and its adjustment module (5)；
Quasi-phase matched frequency-changer crystal and its adjustment module (5), are used for making pump light, with picture signal light, quasi- phase place occur
Coupling, realizes the energy coupling between flashlight, pump light and the conjugation ideler frequency light three corresponding with signal light frequency, through it
The picture signal of output includes enhanced signal light image, and in three wave energy coupling process new producing with signal optical frequency
The corresponding ideler frequency light image of rate.
Image intensifier device based on quasi-phase matched proposed by the present invention, efficiently solves conventional phase coupling image
Contradiction between low resolution and signal gain；Significantly reduce the requirement to signal and pump light pulsewidth simultaneously.
Picture signal selecting module (6), is imaged microscope group by the pump light setting gradually with flashlight separation coupling mirror (600)
(601) light beam accumulation device (603) composition of the pump light and after narrow band filter slice (602) and collection separation, for selecting
State picture signal light or ideler frequency light；Realize it to separate with pump light simultaneously.
Image-forming module (7), is made up of imaging photosensitive element (700), photodetector and equipment for reconstructing image, by itself
Clock control or by synchronization control module (2) trigger, for as needed, becoming to selected flashlight or ideler frequency light
Picture.
As shown in figure 4, described quasi-phase matched frequency-changer crystal and its adjustment module (5) include：Periodic polarized crystal
(500) and temperature control element (501), described periodic polarized crystal (500) and temperature control element (501) are used for carrying out quasi- phase place
Join.
Optionally, described quasi-phase matched frequency-changer crystal and adjustment module (5) also include：Propagate light path along optical imagery to set
Imaging regulating element (502), crystal level and vertical position regulating element (503), crystal pitching and the angle of oscillation put adjust unit
Part (504).
Described quasi-phase matched frequency-changer crystal and its adjustment module (5) are directly realized by the optically erasing of flashlight, and
(or) using the ideler frequency light producing during optical parameter with flashlight conjugation, realize the frequency upooaversion of flashlight.
As shown in figure 5, described flashlight Laser emission is included with receiver module (1)：The signal setting gradually along light path
Light laser (100), signal photocell (101), signal light receiving element (102).
As shown in fig. 6, optional, described pumping laser module (3) includes：Pumping light laser (300), pumping finishing
Shape element (301), and be used for the pumping light transmission component of pumping optical transport to quasi-phase matched frequency-changer crystal surface
(302).
Optionally, described signal light laser (100) is two different laser instrument from pumping light laser (300), or
To be there is provided by the fundamental frequency output and the output through being converted on non-linear frequency for its fundamental frequency of same laser instrument respectively, the two it
Between electricity timing synchronization control to be provided by electricity time-delay mechanism (200), by controlling the launch time of the two, make flashlight
Synchronous in time with pumping laser.
When described signal light laser (100) is two different laser instrument from pumping light laser (300), Synchronization Control
Element 2 also should include generating the delays time to control of timing control signal and trigger, first with pump light light splitting for monitoring signals light
The photodetector of part and the input triggering signal of telecommunication to pumping light laser (300) and (or) signal light laser (100) and
(or) signal of telecommunication trigger (200) of image-forming module 7.
As shown in fig. 6, optional, described synchronization control module (2) further includes：Reflecting element (201) and optics
Translation stage (202), described reflecting element (201) and optical translation platform (202) composition optical delay device, are used for realizing signal
The fine setting of time synchronized between light and pump light.
Optionally, as shown in fig. 6, described flashlight and coupling pump light module (4) are pump light and signal combiner coupling
Close mirror (401) or other optical coupling elements.
Optionally, picture signal selecting module 6 may also include the space filtering aperture light for reducing parametric fluorescence impact
Door screen, or (and) for reducing the neutral density attenuator of background DC component.
As shown in Fig. 2 the present invention also proposes a kind of optical parameter image enchancing method, the method includes：
S1. generation, transmission signal ray laser, and receive the picture signal returning from imageable target (0), so that picture signal is become
As on quasi-phase matched frequency-changer crystal；
S2. control transmitting pumping laser, and make pumping laser and described image signal synchronously arrive at quasi-phase matched frequency conversion
Crystal；
S3. adjust crystal parameter, make pump light, with picture signal light, quasi-phase matched, the picture signal exporting through it occur
Including enhanced signal light image, and the ideler frequency light image corresponding with signal light frequency.
As shown in figure 3, the method may also include：
S4. receive the picture signal through the output of quasi-phase matched frequency-changer crystal, and realize picture signal light or ideler frequency light with
The separation of pump light；
S5. described image flashlight or ideler frequency light are selected；
S6. selected flashlight or ideler frequency light are imaged.
Embodiment 2
With reference to Fig. 6, a kind of the present embodiment pump light of proposition is 355nm and flashlight is 532nm based on quasi-phase matched
The enhanced device of optical imagery.
Wherein, the basic frequency laser for 1064nm produces through frequency multiplication by wavelength for flashlight Laser emission and receiver module (1)
The picosecond laser of 532nm is constituted, and pumping laser module (3) is produced through frequency tripling by the laser from same fundamental frequency 1064nm lasing light emitter
Raw wavelength is that the picosecond laser of 355nm is constituted, and because detection range is nearer, synchronization control module (2) is only by optical delay structure
Become, by accurate measurement flashlight and each self-corresponding light path of pumping laser, synchronized control module (2) adjusts pumping laser
Stroke, makes the two equal.
The present embodiment adopt transmission-type be imaged, signal light laser (100) transmission signal light via half-wave plate (101a) with
And after the signal radiated element that forms of film polarizer (101b) and beam expanding telescope (101f), pass through target (0), warp after this
Signal light receiving element imaging len (102c) imaging of imaging len composition, picture signal is through pump light and signal combiner coupling
Close mirror (401) (be coated with 355nm high anti-and 532nm anti-reflection film) to be imaged to periodic polarized crystal.Quasi-phase matched frequency conversion is brilliant
The temperature of temperature control element regulation periodic polarized crystal (500) in body and its adjustment module (5) is so as to meet the present embodiment
Phase-matching condition, simultaneously to the imaging regulating element propagated along optical imagery, level and vertical position regulating element, crystal
Pitching and angle of oscillation regulating element are also finely adjusted respectively so as to reach optimal imaging effect.
The flashlight of 532nm filters the pump of the 355nm of the overwhelming majority after pump light and flashlight separation coupling mirror (600)
Pu light and the ideler frequency light of 1064nm, pump light enters into the light beam accumulation device (603) of pump light.Pass through by ideler frequency light and pump again
Pu light high anti-and to flashlight high saturating lens (601), narrow band filter slice (602) and for limiting parametric fluorescence background
Aperture. it is imaged by the imaging photosensitive element (700) in image-forming module (7) through the picture signal of selection.
In this example, the deep ultraviolet frequency-changer crystal of use is MgO:PPSLT crystal, MgO:PPSLT crystal parameter is as follows：
Length is 5mm, and the cycle is 6.6 μm, and effective nonlinear coefficient is 6.7pm/V, and thang-kng section is 5 × 8mm2, signal light incident side
Face and exit end are all coated with 355nm and 532nm anti-reflection film；In this example, output coupling mirror is partly defeated using HfO2 plated film
Go out coupling mirror, its substrate adopts fused quartz；In this example, flashlight 532nm and pump light 355nm is derived from same Nd:YAG
Laser instrument, pulsewidth is 100ps, and repetition is 10Hz.
Embodiment 3：
As shown in fig. 7, the present embodiment propose a kind of for pump light be 355nm and flashlight be 1064nm based on quasi- phase
The enhanced device of optical imagery of position coupling.
The present embodiment pumping laser is same as Example 2；Similarly using MgO:PPSLT is as the quasi- phase of 355nm pumping
Position matched crystal, MgO:PPSLT crystal parameter is as follows：Length is 20mm, and the cycle is 6.6 μm, and effective nonlinear coefficient is
6.7pm/V, light pass surface is 5 × 8mm2.Signal light-incident end is coated with 355nm and 1064nm anti-reflection film；Exit end is coated with 355nm
With 532nm anti-reflection film.
Flashlight Laser emission and receiver module (1) Nd for 1064nm by wavelength:YAG basic frequency laser is constituted, and pulsewidth is
100ns, pumping laser module (3) by the laser from another stylobate frequency 1064nm lasing light emitter through the wavelength that frequency tripling produces is
The nanosecond laser of 355nm is constituted, and pulsewidth is about 100ns, and the present embodiment adopts electricity synchronization scenario, using signal of telecommunication trigger
(200) difference trigger light laser and pumping light laser, strictly control the time difference of the two, and coordinate optical delay
It is finely adjusted so that the time delay between pumping laser and signal laser is exactly equal to the optical path difference of the two.In addition the signal of telecommunication
Trigger (200) also triggers the imaging photosensitive element (700) in image-forming module (7) so as to just open when flashlight arrival
Open.The present embodiment adopts reflective echo-wave imaging, and flashlight transmitting and receiving device adopts coaxial design, and common elements are thin film
Polaroid (101b) and quarter wave plate (102a).Signal light laser (100) transmission signal light via half-wave plate (101a) and is sent out
Penetrate and signal radiated element (101) that shaping lens group (101c), film polarizer (101b) and quarter wave plate (102a) form it
After expose to target 0 surface, the echo-signal of reflection through signal light receiving element (102) (by film polarizer (101b), 1/4
Wave plate (102a), reflective imaging telescope (102b), imaging len (102c) composition) imaging, picture signal through pump light with
Signal combiner coupling mirror (401) (be coated with 355nm high anti-and 1064nm anti-reflection film) is imaged to periodic polarized crystal (500)
Place.The temperature of the temperature control element regulation periodic polarized crystal in quasi-phase matched frequency-changer crystal and its adjustment module (5), makes
It meets the phase-matching condition of the present embodiment, simultaneously to the imaging regulating element propagated along optical imagery, level and vertical position
Put regulating element, crystal pitching and angle of oscillation regulating element to be also finely adjusted respectively so as to reach optimal imaging effect.
The present embodiment, except strengthening 1064nm signal with direct detection, is also with the parameter of OPA process changing spy
Property, directly after pump light and flashlight separation coupling mirror (600), the overwhelming majority is filtered to the weak image signal of 532nm
The pump light of 355nm and the flashlight of 1064nm, pump light enters into the light beam accumulation device (603) of pump light.Pass through by right again
Flashlight and pump light high anti-and to ideler frequency light high saturating lens (601), narrow band filter slice (602). through the image of selection
Signal is imaged by the imaging photosensitive element (700) in image-forming module (7).
In this example, flashlight 1064nm is derived from two different Nd with pump light 355nm:YAG laser, pulsewidth is equal
For 100ns, repetition is 10Hz.
Embodiment 4：
As shown in figure 8, the present embodiment proposes, and one kind is 532nm for nanosecond pump light and continuous wave signal light is 1550nm
The enhanced device of the optical imagery based on quasi-phase matched, the present embodiment is scanned formula to target (0), so using flashlight
After carry out pointwise and reconstruct picture.
In this example, using MgO:PPLN is as the quasi-phase-matching crystals of nanosecond 532nm laser pump (ing), MgO:PPLN
Crystal parameter is as follows：Length is 50mm, and the cycle is 7.58 μm, and effective nonlinear coefficient is 16pm/V.Due to being rebuild using pointwise
Imaging, the present embodiment thang-kng section only has 3 × 3mm2. signal light-incident end and is coated with 532nm and 1550nm anti-reflection film；Exit end
It is coated with 532nm and 810nm anti-reflection film.
The present embodiment is directed to distant object, using electricity synchronization scenario, is triggered respectively using signal of telecommunication trigger (200)
Signal light laser (100) and pumping light laser (300), strict controlling pumping light reach at periodic polarized crystal when
Carve so as to realize range gating.In addition signal of telecommunication trigger (200) also trigger photodetector in image-forming module (7) so as to
Just open when flashlight arrival.
The present embodiment adopts reflective echo-wave imaging, and signal light laser (100) transmission signal light is via half-wave plate
(101a), film polarizer (101b), shaping lens group (101c), transmitter-telescope (101d) and light beam scanning rotating element
(101e) expose to target (0) surface after the signal radiated element forming, carry out point by point scanning, the reflection echo signal of each point
Through signal light receiving element (102) (being made up of reflective imaging telescope (102b) and imaging len (102c)) and pump light with
Signal combiner coupling mirror (401) (be coated with 532nm high anti-and 1550nm anti-reflection film) transmits to periodic polarized crystal.Quasi- phase
The temperature of the temperature control element regulation periodic polarized crystal in position coupling frequency-changer crystal and its adjustment module (5) is so as to meet
The phase-matching condition of the present embodiment, is adjusted to the imaging regulating element propagated along optical imagery, level and vertical position simultaneously
Element, crystal pitching and angle of oscillation regulating element are also finely adjusted respectively so as to reach optimal imaging effect.
The present embodiment is except can be possible with the parameter of OPA process with direct detection enhanced 1550nm signal simultaneously
Transfer characteristic, the pump light filtering most 532nm after pump light and flashlight separation coupling mirror (600) is with 1550nm's
Flashlight, the conjugation ideler frequency optical wavelength obtaining, just in 810nm, belongs to photodetector quantum efficiency highest wave band.Remaining
Pump light enter into the light beam accumulation device (603) of pump light.Ideler frequency light is through by high to flashlight and pump light anti-and right
The high saturating lens (601) of ideler frequency light, narrow band filter slice (602) and the aperture for limiting parametric fluorescence background, pass through
The picture signal selecting is imaged by the imaging photosensitive element (700) in image-forming module (7).
In this example, 1550nm flashlight comes from a continuous wave operating Erbium doped fiber laser amplifier, 532nm pump
Pu light is derived from 1064nm nanosecond Nd:YAG laser exports through frequency multiplication, and pulsewidth is 100ns, and repetition is 10Hz.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, common about technical field
Technical staff, without departing from the spirit and scope of the present invention, can also make a variety of changes and modification, such as described
The pulsewidth of signal light laser (100) and pumping light laser (300) also can adopt psec, femtosecond, can also adopt nanosecond,
Microsecond pulse may be selected output wavelength to continuous wave, described signal light laser (100), and described signal light wavelength includes purple
Outward, visible and infrared band.Therefore all equivalent technical schemes fall within scope of the invention, the patent protection model of the present invention
Enclose and should be defined by the claims.
Claims (9)
1. a kind of optical parameter image intensifier device is it is characterised in that this device includes flashlight Laser emission and receiver module
(1), synchronization control module (2), pumping laser module (3), flashlight and coupling pump light module (4), quasi-phase matched frequency conversion
Crystal and its adjustment module (5), picture signal selecting module (6) and image-forming module (7), wherein：
Flashlight Laser emission and receiver module (1), for producing, transmission signal ray laser, and receive and return from imageable target (0)
The picture signal returned；
Synchronization control module (2), for controlling pumping laser module (3), makes pumping laser pass through with described image signal simultaneously
Flashlight and coupling pump light module (4), subsequently into quasi-phase matched frequency-changer crystal and its adjustment module (5)；
Quasi-phase matched frequency-changer crystal and its adjustment module (5), are used for making pump light, with picture signal light, quasi-phase matched occur,
Realize the energy coupling between flashlight, pump light and the conjugation ideler frequency light three corresponding with signal light frequency, through its output
Picture signal include enhanced signal light image, and in three wave energy coupling process new producing with signal light frequency phase
Corresponding ideler frequency light image；
Picture signal selecting module (6), by the pump light setting gradually and flashlight separation coupling mirror (600), imaging microscope group
(601), narrow band filter slice (602) and light beam accumulation device (603) composition collecting the pump light after separating, described for selecting
Picture signal light or ideler frequency light, are realized it simultaneously and are separated with pump light.
Image-forming module (7), is made up of imaging photosensitive element (700), photodetector and equipment for reconstructing image, by itself clock
Control or triggered by synchronization control module (2), for as needed, being imaged to selected flashlight or ideler frequency light.
2. optical parameter image intensifier device as claimed in claim 1, is further characterized in that：
Described quasi-phase matched frequency-changer crystal and its adjustment module (5) include：Periodic polarized crystal (500) and temperature control element
(501), described periodic polarized crystal (500) and temperature control element (501) are used for carrying out quasi-phase matched.
3. optical parameter image intensifier device as claimed in claim 2, is further characterized in that：
Described quasi-phase matched frequency-changer crystal and adjustment module (5) also include：The imaging propagating light path setting along optical imagery is adjusted
Section element (502), level and vertical position regulating element (503), crystal pitching and angle of oscillation regulating element (504).
4. optical parameter image intensifier device as claimed in claim 1, is further characterized in that：
Described quasi-phase matched frequency-changer crystal and its adjustment module (5) are directly realized by the optically erasing of flashlight, and/or utilize
The frequency upooaversion that the ideler frequency light being conjugated with flashlight realizes flashlight is produced during optical parameter.
5. optical parameter image intensifier device as claimed in claim 1, is further characterized in that：
Described flashlight Laser emission is included with receiver module (1)：The signal light laser (100) setting gradually along light path,
Signal photocell (101), signal light receiving element (102).
6. optical parameter image intensifier device as claimed in claim 1, is further characterized in that：
Described pumping laser module (3) includes：Pumping light laser (300), pump light shaping element (301) and for will
Pumping optical transport to quasi-phase matched frequency-changer crystal surface pumping light transmission component (302).
7. optical parameter image intensifier device as claimed in claim 6, is further characterized in that：Described signal light laser (100)
It is two different laser instrument from pumping light laser (300), or respectively by fundamental frequency output and its fundamental frequency of same laser instrument
Providing, time synchronized therebetween to be realized by synchronization control module (2) for output through being converted on non-linear frequency.
8. the optical parameter image intensifier device as described in claim 1 or 7, is further characterized in that：Described synchronization control module (2)
Specifically include：Electricity time-delay mechanism (200) and/or optical delay device, wherein electricity time-delay mechanism (200) pass through trigger
Control signal light laser (100) and the launch time of pumping light laser (300), make pumping photoemissive time delay and letter
The transmitting of number light is equal with the time receiving experience, and described optical delay device specifically includes reflecting element (201) and optics is flat
Moving stage (202), for realizing the fine setting of time synchronized between flashlight and pump light.
9. a kind of optical parameter image enchancing method is it is characterised in that the method includes：
Generation, transmission signal ray laser, and receive the picture signal returning from imageable target (0), make picture signal be imaged onto standard
On phase matched frequency-changer crystal；
Control transmitting pumping laser, and make pumping laser and described image signal synchronously arrive at quasi-phase-matching crystals；
Adjust crystal parameter, make pump light realize coupling of energy with picture signal light by quasi-phase matched, through quasi- phase place
Picture signal after joining includes enhanced signal light image, and the ideler frequency light image corresponding with signal light frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310108408.6A CN104076574B (en) | 2013-03-29 | 2013-03-29 | Optical image enhancement device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN105911792A (en) * | 2016-07-04 | 2016-08-31 | 中国科学院理化技术研究所 | Non-linear optical imaging device based on multi-phase matching process |
| CN106375657A (en) * | 2016-08-23 | 2017-02-01 | 江苏北方湖光光电有限公司 | System for realizing extended depth of field under narrow pulse gating of image intensifier |
| CN112307922A (en) * | 2020-10-23 | 2021-02-02 | 泰州芯源半导体科技有限公司 | Remote sensing data transceiving-based crisis analysis platform |
| CN113176583B (en) * | 2021-04-02 | 2023-02-07 | 华东师范大学重庆研究院 | Ultra-sensitive infrared high-resolution three-dimensional imaging technology |
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