CN212905463U - Ultrahigh-speed optical parametric amplification optical imaging system - Google Patents
Ultrahigh-speed optical parametric amplification optical imaging system Download PDFInfo
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- CN212905463U CN212905463U CN201922195017.8U CN201922195017U CN212905463U CN 212905463 U CN212905463 U CN 212905463U CN 201922195017 U CN201922195017 U CN 201922195017U CN 212905463 U CN212905463 U CN 212905463U
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Abstract
The utility model discloses an ultra-high speed optical parametric amplification optical imaging system, which comprises a light source system, a light splitting time delay system, an optical parametric amplification system and an image recording system; the method comprises the steps that incident continuous or long pulse laser is subjected to beam splitting and delay processing to obtain a plurality of sub-beams carrying object information with specific time delay, incident ultra-short pulse laser is a pump and is subjected to non-collinear optical parametric amplification to obtain an idler frequency light array carrying the object information with the specific time delay, and an image of the object information with the specific time delay carried by the incident idler frequency light array is imaged; the imaging of different moments of an object is realized, high space bandwidth product, high framing frequency and framing imaging of more than ten frames are realized, and ultrahigh-speed optical imaging with picosecond or even femtosecond time resolution is realized.
Description
Technical Field
The utility model relates to an optical imaging field especially relates to a hypervelocity optical parameter enlargies optical imaging system who has the time resolution ratio of picosecond or femtosecond even.
Background
The high-speed optical imaging technology has important application in many fields, such as scientific research under extreme conditions of an extremely-fast flyer technology, a Z-Pinch magnetic burst ferrule, a variable-ratio magnetic impulse plasma rocket and the like, while in the fields of high-field physics, laser fast ignition, laser plasma and femtosecond chemistry, ultrafast processes are always in the time scale of picoseconds or even femtoseconds, and the recording of the transient optical processes requires time span of dozens of picoseconds, femtosecond time resolution and terahertz frame frequency; in the prior art, the main shooting frequency of the rotating mirror high-speed imaging technology is 106fps～107The fps range can only reach 10 by combining the technologies of optical acceleration, network photography and the like9In the order of fps (frames per second); the image converter tube technology has the advantages of wavelength conversion and low-light imaging, but the space bandwidth and the number of the images are limited by the electronic optical imaging system and the electronic deflection system, and the image decomposition technology can increase the photographic frequency to 109fps; with the rapid development of the ultrashort pulse laser technology, the femtosecond time-resolved ultrafast holographic imaging technology is developed rapidly, the ultrashort pulse holographic technology of amplitude splitting azimuth encoding has realized the ultrahigh-speed imaging with the framing time of 0.3 picosecond, and the ultrafast holographic technology of wave-front splitting azimuth encoding has also successfully obtained 4-picosecond-magnitude framing-interval water and CS2An image of a non-linear variation process; in additionIn addition, wavelength coding, polarization coding and other technologies also appear, but the technologies are difficult to obtain more than ten optical images with high time resolution, so that for picosecond-level extremely high-speed optical imaging, high time resolution, high spatial bandwidth product, high framing frequency and high number of image shooting frames are all vital technical parameters; although ultrafast optics can achieve high time resolution optical images, it is a great technical challenge if high spatial bandwidth product, high amplitude frequency and over ten multiple images are simultaneously satisfied.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide an optical imaging system for amplifying ultra high speed optical parameters, which solves the problem of the prior art that the spatial bandwidth and the frame size of the image are limited by the electronic optical imaging system.
In order to achieve the above object, the present invention provides in a first aspect an ultra-high speed optical parametric amplification optical imaging system, comprising a light source system, a beam splitting delay system, an optical parametric amplification system and an image recording system;
the light source system comprises an ultrashort pulse laser and a continuous or long pulse laser, the ultrashort pulse laser is used for outputting ultrashort pulse laser and is incident to the optical parametric amplification system, and the continuous or long pulse laser is used for outputting continuous or long pulse laser and is incident to the light splitting delay system;
the light splitting delay system is used for splitting and delaying the incident continuous or long pulse laser to obtain a plurality of sub-beams carrying object information with specific time delay, and the sub-beams are incident to the optical parametric amplification system;
the optical parametric amplification system is used for carrying out non-collinear optical parametric amplification on the sub-beams by taking the incident ultrashort pulse laser as a pump to obtain an idler frequency optical array carrying object information with specific time delay, and the idler frequency optical array is incident to the image recording system;
the image recording system is used for imaging the incident image of the object information with specific time delay carried by the idler frequency light array.
Furthermore, the ultra-short laser pulse is incident to a harmonic converter and is partially converted into an ultra-high harmonic pulse, the ultra-high harmonic pulse is used for pump light of a subsequent optical parametric amplifier, the non-converted ultra-short laser pulse at the other part of the harmonic converter is used for generating an ultra-fast event, and the output continuous or long pulse laser light irradiates on object information carried by the ultra-fast event placed on an object plane of an imaging system and is incident to the light splitting delay system.
Further, the optical splitting delay system includes: the optical system comprises an imaging lens, a binary optical element beam splitter, a collimating lens, a beam delay array and a hole shrinking optical system;
the imaging lens is used for imaging the continuous or long pulse laser to the surface of the secondary optical element beam splitter;
the secondary optical element beam splitter is used for splitting the imaged continuous or long pulse laser into a plurality of sub beams, and the plurality of sub beams are incident to the collimating lens;
the collimating lens is used for enabling the transmission directions of the sub-beams to be parallel to each other and enabling the sub-beams to be incident to the beam delay array;
the beam delay array is used for delaying the incident sub-beams to obtain a plurality of sub-beams carrying object information with specific time delay, and the sub-beams are incident to the hole-shrinking optical system;
the hole-shrinking optical system is used for shrinking holes of the sub-beams and enabling the sub-beams to be incident to the optical parametric amplification system.
Further, the beam delay array comprises two step mirrors, and the two step mirrors are perpendicular to each other in the step direction.
Furthermore, the parametric amplification system comprises an optical retarder, a beam expanding optical system and an optical parametric amplification crystal;
the optical retarder is used for retarding a plurality of incident sub-beams and enabling the sub-beams to be incident to the beam expanding optical system;
the beam expanding optical system is used for expanding the holes of the incident sub-beams and irradiating the sub-beams to the optical parametric amplification crystal;
the optical parametric amplification crystal is used for carrying out non-collinear optical parametric amplification on a plurality of incident sub-beams by taking the ultrashort pulse laser as a pump to obtain an idler frequency optical array carrying object information with specific time delay.
Furthermore, the parametric amplification system also comprises a reflecting mirror and a beam combiner which are positioned between the beam expanding optical system and the optical parametric amplification crystal;
the reflector is used for reflecting the sub-beams expanded by the beam expanding optical system and reflecting the sub-beams to the beam combiner;
the beam combiner is used for combining the plurality of incident sub beams and the ultrashort pulse laser and then irradiating the combined sub beams and the ultrashort pulse laser to the optical parametric amplification crystal.
Further, the image recording system comprises a coupling optical system and a two-dimensional CCD array system;
the coupling optical system is used for imaging an image of object information carried by the idler frequency light array to an array recording surface of the two-dimensional CCD array system.
The utility model has the advantages that: the method comprises the steps of splitting and delaying incident continuous or long pulse laser by using a light splitting delay system to obtain a plurality of sub-beams carrying object information with specific time delay, carrying out non-collinear optical parametric amplification on the plurality of sub-beams by using an optical parametric amplification system to take incident ultrashort pulse laser as a pump to obtain idler frequency light arrays carrying the object information with the specific time delay, receiving the idler frequency light arrays by an image recording system to realize imaging of different moments of the object, realizing high space bandwidth product, high amplitude frequency and framing imaging of more than ten frames, and realizing ultrahigh-speed optical imaging with picosecond or femtosecond time resolution.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ultra-high speed optical parametric amplification optical imaging system according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of an ultra-high speed optical parametric amplification optical imaging system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another embodiment of the present invention showing an ultra-high speed optical parametric amplification optical imaging system;
fig. 4 is another schematic structural diagram of an ultra-high speed optical parametric amplification optical imaging system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 4, schematic structural diagrams of an ultra-high speed optical parametric amplification optical imaging system according to an embodiment of the present invention are shown, where the ultra-high speed optical parametric amplification optical imaging system includes a light source system 101, a beam splitting delay system 201, an optical parametric amplification system 301, and an image recording system 401.
The light source system 101 includes an ultra-short pulse laser 1011 and a continuous or long pulse laser 1012, the ultra-short pulse laser 1011 is used for outputting ultra-short pulse laser, the continuous or long pulse laser is used for outputting continuous or long pulse laser, the ultra-short pulse laser is incident to the optical parametric amplification system 301 as pump light, the continuous or long pulse laser irradiates object information carried by an ultra-fast event placed on an object plane of the imaging system and is incident to the light splitting delay system 201, the ultra-short pulse laser 1011 can be a Ti: S regenerative amplification femtosecond laser outputting 1kHz, 35fs, 3.5W and 800nm, and the continuous laser is a continuous laser outputting 10W, 1064nm, a single longitudinal mode, a single transverse mode and linear polarization.
In the embodiment of the present invention, the ultrashort pulse laser 1011 serves as the pump light of the optical parametric amplification system 301 and the pump light for exciting the ultrafast time, and the ultrahigh speed optical parametric amplification optical system further includes: the high-order harmonic pulse 501 is used for partially converting initial ultra-short pulse laser output by an ultra-short pulse laser into high-order harmonic pulse, about 30% of the initial ultra-short pulse laser is converted into a 400nm light beam which is used for pump light of a subsequent optical parametric amplifier, the other part of the non-converted ultra-short laser pulse is used for generating an ultrafast event, and meanwhile, continuous or long pulse laser is output to irradiate object information carried by the ultrafast event placed on an object plane of an imaging system and is incident to the beam splitting delay system 201. The lifetime of the ultrafast event is about picosecond, so that each exposure time of 49 frames of frame imaging is required to be less than 100 femtoseconds, and the recording time interval is about 100 femtoseconds.
The light splitting delay system 201 is configured to split and delay an incident continuous or long pulse laser to obtain a plurality of sub beams carrying object information with a specific time delay, where the sub beams are incident to the optical parametric amplification system 301, and the light splitting delay system 201 includes: an imaging lens 2011, a binary optical element beam splitter 2012, a collimating lens 2013, a beam delay array 2014 and a hole-shrinking optical system 2015, and a 4f confocal imaging system composed of the above components, wherein the imaging lens 2011 is used for imaging the continuous or long pulse laser to the surface of the secondary optical element beam splitter 2012, the secondary optical element beam splitter 2012 is used for splitting the imaged continuous or long pulse laser into a plurality of sub-beams, the plurality of sub-beams are incident to the collimating lens 2013, the collimating lens 2013 is used for making the transmission directions of the plurality of sub-beams parallel to each other and incident to the beam delay array 2014, the beam delay array 2014 is used for delaying the plurality of incident sub-beams to obtain a plurality of sub-beams carrying object information with specific time delay, the plurality of sub-beams are incident to the hole-shrinking optical system 2015, and the hole-shrinking optical system 2015 shrinks the plurality of sub-beams, and is incident on the optical parametric amplification system 301. The beam delay array 2015 includes two step mirrors, the two step mirrors are perpendicular to each other in the step direction, and the length of the optical delay time between the sub-beams is determined by changing the beam delay array material and adjusting the distance between the step mirrors. The continuous or long pulse laser beam incident to the optical delay system 201 carries object information of an ultrafast event, the ultrafast event can be sampled by the binary optical element beam splitter 2012 and split into 7 × 7 identical sub-beams, the sub-beams pass through an optical delay array 2014 composed of 49 units, enter the optical parametric amplification system 301 after being shrunk, and simultaneously, each sub-beam reaching the optical parametric amplification system carries object information at different times, and a corresponding amplitude time interval is determined by the optical delay 3011 in the optical parametric amplification system 301.
In the embodiment of the present invention, the light beam is finally delayed by the action of each component inside the light splitting delay system 201, and the plurality of sub-light beams enter the optical parametric amplification system 301.
The optical parametric amplification system 301 is configured to perform non-collinear optical parametric amplification on the sub-beam by using the incident ultrashort pulse laser as a pump to obtain an idler array carrying object information with a specific time delay, where the idler array is incident to the image recording system 401, and the image recording system 401 is configured to image an image of the object information with the specific time delay carried by the incident idler array. Wherein, the parametric amplification system comprises an optical retarder 3011, a beam expanding optical system 3012, a reflector 3013, a beam combiner 3014 and an optical parametric amplification crystal 3015, when the ultrashort pulse laser is incident on the parametric amplification system 301, that is, the ultrashort pulse laser is incident on the optical retarder 3011, the optical retarder 3011 delays the incident multiple sub-beams and is incident on the beam expanding optical system, the beam expanding optical system 3012 expands the multiple incident sub-beams and is incident on the reflector 3013, the reflector 3013 reflects the multiple sub-beams expanded by the beam expanding optical system 3012 and is reflected to the beam combiner 3014, the beam combiner 3014 is used for combining the multiple incident sub-beams and ultrashort pulse laser and is incident on the optical parametric amplification crystal 3015, the optical parametric amplification crystal is used for non-linear parametric amplification of the multiple incident sub-beams by using the ultrashort pulse laser as pumping light, and obtaining an idler frequency optical array carrying object information with specific time delay, wherein the idler frequency optical array is incident to the beam expanding optical system 3012, expands the incident multiple sub-beams, and finally is incident to the image recording system. Accordingly, each idler light carries object information derived from each signal light.
The embodiment of the present invention provides an in, can realize the adjustment to the size of the non-collinear angle between ultrashort pulse laser and a plurality of sub-beams through adjusting speculum 3013 and beam combiner 3014 for realize bandwidth, the optimal optical parametric amplification effect of gain, adjust optical delay 3011 then can control the time delay between pumping light and the sub-beam.
In the embodiment of the present invention, the image recording system 401 includes a coupling optical system 4011 and a two-dimensional CCD array system 4012, and the coupling optical system 4011 is used to image the image of the object information carried by the incident idler array onto the array recording surface of the two-dimensional CCD array system 4012, so that these light beams are received by the CCD camera combined array after passing through the optical imaging coupling system 4011, and a plurality of time sequence images with specific delay are obtained, for example, 49 framing time sequence images are obtained.
The light passing through the light source system is respectively incident to the light splitting delay system and the optical parametric amplification system, and finally the sub-beams carry object information with certain time delay to reach the same place at the same time by utilizing the light beam delay array, and then pumping sampling is carried out by utilizing the ultrashort pulse laser, so that imaging of different moments of the object can be realized, high space bandwidth product, high amplitude frequency and more than ten pieces of imaging can be realized, super-high-speed optical imaging with picosecond or even femtosecond time resolution is realized, and the working efficiency of imaging is greatly improved.
The above is only the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.
Claims (7)
1. An ultra-high speed optical parametric amplification optical imaging system, comprising: the system comprises a light source system, a light splitting delay system, an optical parametric amplification system and an image recording system;
the light source system comprises an ultrashort pulse laser and a continuous or long pulse laser, the ultrashort pulse laser is used for outputting ultrashort pulse laser and is incident to the optical parametric amplification system, and the continuous or long pulse laser is used for outputting continuous or long pulse laser and is incident to the light splitting delay system;
the light splitting delay system is used for splitting and delaying the incident continuous or long pulse laser to obtain a plurality of sub-beams carrying object information with specific time delay, and the sub-beams are incident to the optical parametric amplification system;
the optical parametric amplification system is used for carrying out non-collinear optical parametric amplification on the sub-beams by taking the incident ultrashort pulse laser as a pump to obtain an idler frequency optical array carrying object information with specific time delay, and the idler frequency optical array is incident to the image recording system;
the image recording system is used for imaging the incident image of the object information with specific time delay carried by the idler frequency light array.
2. The system of claim 1, wherein the ultrashort pulse laser is incident on a harmonic converter and partially converted into a higher harmonic pulse, the higher harmonic pulse is used for pump light of a subsequent optical parametric amplifier, the unconverted ultrashort laser pulse at another part of the harmonic converter is used for generating an ultrafast event, and the output continuous or long pulse laser irradiates object information carried by the ultrafast event placed on an object plane of the imaging system and is incident on the split delay system.
3. An ultra-high speed optical parametric amplification optical imaging system as claimed in claim 1, wherein said spectroscopic delay system comprises: the optical system comprises an imaging lens, a secondary optical element beam splitter, a collimating lens, a beam delay array and a hole shrinking optical system;
the imaging lens is used for imaging the continuous or long pulse laser to the surface of the secondary optical element beam splitter;
the secondary optical element beam splitter is used for splitting the imaged continuous or long pulse laser into a plurality of sub beams, and the plurality of sub beams are incident to the collimating lens;
the collimating lens is used for enabling the transmission directions of the sub-beams to be parallel to each other and enabling the sub-beams to be incident to the beam delay array;
the beam delay array is used for delaying the incident sub-beams to obtain a plurality of sub-beams carrying object information with specific time delay, and the sub-beams are incident to the hole-shrinking optical system;
the hole-shrinking optical system is used for shrinking holes of the sub-beams and enabling the sub-beams to be incident to the optical parametric amplification system.
4. The optical imaging system for ultra high speed optical parametric amplification of claim 3, wherein the beam delay array comprises two step mirrors, the step directions of the two step mirrors being perpendicular to each other.
5. An ultra high speed optical parametric amplification optical imaging system according to claim 2, wherein the parametric amplification system comprises an optical retarder, a beam expanding optical system, and an optical parametric amplification crystal;
the optical retarder is used for delaying the incident higher harmonic pulse and is incident to the beam expanding optical system;
the beam expanding optical system is used for expanding the hole of the incident higher harmonic pulse and is incident to the optical parametric amplification crystal;
the optical parametric amplification crystal is used for carrying out non-collinear optical parametric amplification on a plurality of incident sub-beams by taking the ultrashort pulse laser as a pump to obtain an idler frequency optical array carrying object information with specific time delay.
6. The optical imaging system for ultra high speed optical parametric amplification according to claim 5, further comprising a mirror and a beam combiner between the beam expanding optical system and the optical parametric amplification crystal;
the reflector is used for reflecting the sub-beams expanded by the beam expanding optical system and reflecting the sub-beams to the beam combiner;
the beam combiner is used for combining the incident multiple sub beams and the high-order harmonic pulses and then irradiating the sub beams and the high-order harmonic pulses to the optical parametric amplification crystal.
7. The optical imaging system for ultra high speed optical parametric amplification according to claim 1, wherein the image recording system comprises a coupled optical system and a two-dimensional CCD array system;
the coupling optical system is used for imaging an image of object information carried by the idler frequency light array to an array recording surface of the two-dimensional CCD array system.
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