CN102494767B - Device for generating orthogonal polarized double-color laser field - Google Patents
Device for generating orthogonal polarized double-color laser field Download PDFInfo
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- CN102494767B CN102494767B CN 201110415321 CN201110415321A CN102494767B CN 102494767 B CN102494767 B CN 102494767B CN 201110415321 CN201110415321 CN 201110415321 CN 201110415321 A CN201110415321 A CN 201110415321A CN 102494767 B CN102494767 B CN 102494767B
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Abstract
The invention discloses a device for generating an orthogonal polarized double-color laser field. The device comprises a femtosecond laser, wherein a beam splitting sheet is arranged at the outlet of the femtosecond laser; a light beam is divided into two beams by the beam splitting sheet; one light beam enters a planar reflector time delay device, and then is emitted into a first focusing lens; the other light beam sequentially passes by a 1/2 slide and a frequency doubling crystal and then emerges; a first planar reflector is arranged on an emergent light path; a second focusing lens is arranged on the emergent light path of the first planar reflector; the light beam is focused by the second focusing lens, and then is emitted into a second planar reflector; the light beam is reflected by the second planar reflector, and then enters an air box; and the air box is connected with a high-order harmonic generation and detection device. The device for generating the orthogonal polarized double-color laser field can freely adjust an angle of a combined beam consisting of two light beams, and keep a spatial position unchanged when a laser focus and an air medium are interacted with eachother; therefore, on the time, a long electronic trace can be filtered; on the space, a short electronic trace can be retained; and the short electronic trace can be obtained to the greatest extent.
Description
Technical field
The present invention relates to the generating device of laser technical field, specifically just relate to the generation device of the cross polarization two-color laser field of a kind of time and space optimal control synchronously.
Background technology
In recent years, higher hamonic wave becomes the research topic in a forward position of high field physical field in the world gradually with its application prospect widely.Higher hamonic wave is because radiation spectrum presents the equifrequent distinct advantages spaced apart that platform area and platform area harmonic wave have rule, be widely used in research and obtain chirped pulse, acquisition by chirped pulse, the human motion process that can measure inner electron in various atoms, the molecular media is surveyed bound state and continuous state electron dynamics under the high field; Higher hamonic wave can also be under the situation of carrier wave phase locking, and the optical frequency com of generation different cycles is just expanded to ultraviolet, extreme ultraviolet waveband by infrared and visible light wave range at present, thereby can realize the spectrographic detection of ultrahigh resolution.
The production process of higher hamonic wave mainly is to be produced by long electronic orbit and short electronic orbit acting in conjunction.At present when research higher hamonic wave spectrum, what concentrate to pay close attention to is the effect of the short electronic orbit that isolates, for the long electronic orbit that can effectively suppress higher hamonic wave produces, higher degree ground keeps short electronic orbit, mainly is upward and on the space to take laboratory facilities respectively from the time at present.
Generally speaking, for the selection control of short electronic orbit, the either side that mainly is to use cross polarization two-color laser field or laser spot to be arranged in this two aspect, gas medium the place ahead is controlled.Though these two kinds of methods can be collected short electronic orbit to a great extent, but still have the influence of long electronic orbit, this is to effective acquisition of the single chirped pulse of precision and improve its energy conversion efficiency and still have very big influence.
In addition, existing two-color laser field adopts two bundles to swash the fixing mode of combiner angle mostly, in the course of the work as needing to adjust angle, can change the light path of two-beam, not only need accurate calculating, the adjusting of experimental provision is also very loaded down with trivial details, can not keep the laser spot locus constant when changing the two-beam angle.
Summary of the invention
The generation device that the purpose of this invention is to provide a kind of cross polarization two-color laser field, this device can freely be adjusted the angle that two-beam closes bundle, and the locus when keeping laser spot and gas medium to interact is constant, not only from the time, can filter long electronic orbit, can also spatially keep short electronic orbit, thereby can farthest obtain short electronic orbit.
Technical scheme
In order to solve above-mentioned technical barrier, the present invention designs the generation device of a kind of cross polarization two-color laser field, it comprises femto-second laser, the femto-second laser exit is placed with beam splitting chip, femto-second laser penetrates light and is divided into two bundles by beam splitting chip, a branch of light is injected first condenser lens after entering the plane mirror time-delay mechanism, light enters gas box after first condenser lens focuses on, another Shu Guang is successively through outgoing behind 1/2 wave plate and the frequency-doubling crystal, first plane mirror is housed on the emitting light path, second condenser lens is housed on the emitting light path of first plane mirror, light is injected second plane mirror after second condenser lens focuses on, light is gone into the gas box through the second plane reflection mirror reflection is laggard, and the gas box produces with higher hamonic wave and is connected with sniffer, it is characterized in that:
Described second plane mirror is installed on the composition motor, composition motor comprises first motor and second motor, first motor is installed on second motor, first motor can move with second motor along continuous straight runs together, and second plane mirror is contained on first motor and can rotates around first motor shaft together with first motor.
Described first plane mirror is selected dichroic mirror for use.
Described second plane mirror is selected dichroic mirror for use.
On the light path between described plane mirror time-delay mechanism and first condenser lens the 3rd plane mirror is installed, light penetrates by injecting first condenser lens again after the 3rd plane reflection mirror reflection from the plane mirror time-delay mechanism.
On the light path between described first plane mirror and second condenser lens Siping City's face catoptron and the 5th plane mirror are housed successively, light penetrates by Siping City's face catoptron and the 5th plane reflection mirror reflection are laggard from first plane mirror goes into second condenser lens.
Described the 3rd plane mirror is selected plane mirror for use.
Described Siping City face catoptron and the 5th plane mirror are all selected dichroic mirror for use
Described frequency-doubling crystal is bbo crystal or lbo crystal or ktp crystal.
Described first, second, third and fourth is high antiplane mirror with five plane mirrors.
Beneficial effect
The present invention is simple, easily operation, angle that can the free adjustment two-beam.Only need suitably to adjust the shift position of second motor and the rotational angle of first motor, just can realize closing the change of bundle optic angle degree, and by changing flat mirror reflects delayed time system assurance two-beam equivalent optical path, space behavior invariant position between while laser spot and the gas medium, can on time and space, realize the selection control of the length electronic orbit the higher hamonic wave production process simultaneously, remove the influence of long electronic orbit effectively, the advantage that only keeps short electronic orbit, be conducive to the generation of the higher hamonic wave of phase stabilization, be conducive to obtain single chirped pulse, and the two-color laser field control system that this time and space can be optimized synchronously all is suitable for for the light source of various pulse widths and wavelength, has saved cost.
Description of drawings
Accompanying drawing 1 is embodiment of the invention structural representation.
Wherein, 1, femto-second laser, 2,1:1 beam splitting chip, 3, plane mirror time-delay mechanism, the 4, the 3rd high antiplane mirror, 5, first condenser lens, 6,1/2 wave plate, 7, the BBO frequency-doubling crystal, 8, the first high antiplane mirror, 9, the 4th high antiplane mirror, the 10, the 5th high antiplane mirror, 11, second condenser lens 12, composition motor, 12a, first motor, 12b, second motor, 13, the second high antiplane mirror, 14, gas box, 15, higher hamonic wave produces and sniffer.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in Figure 1, exporting center wavelength of light with femto-second laser is 800nm, pulse width is 40fs, the frequency doubled light that obtains 400nm with BBO frequency-doubling crystal 7 is example, femto-second laser 1 exit is placed with beam splitting chip 2, femto-second laser 1 penetrates light and is divided into two bundles by beam splitting chip 2, a branch of light enters plane mirror time-delay mechanism 3, it is to inject first condenser lens 5 again after the 3rd high antiplane catoptron 4 reflections of HR800nm that light penetrates by specification from plane mirror time-delay mechanism 3, and light enters gas box 14 after first condenser lens 5 focuses on; Another light source beam is by the light source of a BBO frequency-doubling crystal 7 generation 400nm, because the characteristic of bbo crystal, the 400nm light source that produce this moment is just in time mutually orthogonal with the polarization state of incident 800nm light source.If frequency-doubling crystal 7 uses other crystal maybe to need to adjust the polarization state of 400nm outgoing light source, then utilize 1/2 wave plate, 6 rotation incident polarized state of lights.Comprise 800nm and 400nm two kind light sources in the BBO frequency-doubling crystal 7 outgoing light sources this moment, the first high antiplane catoptron 8 that specification is all HR400nm/AR800nm is housed on BBO frequency-doubling crystal 7 emitting light paths successively, the 4th high antiplane mirror 9 and the 5th high antiplane mirror 10, light penetrates by the 4th high antiplane mirror 9 and the 5th high antiplane mirror 10 reflection back transmissions from the first high antiplane mirror 8 and falls the 800nm light source, reflection 400nm light source enters second condenser lens 11, light is injected specification after second condenser lens 11 focuses on be the HR400nm/AR800nm second high antiplane mirror 13, the described second high antiplane mirror 13 is installed on the composition motor 12, composition motor 12 comprises the first motor 12a, the first motor 12a is installed on the second motor 12b, the first motor 12a can move with second motor 12b along continuous straight runs together, and the second high antiplane mirror 13 is contained on the first motor 12a and can rotates around the first motor 12a axle together with the first motor 12a; Light enters gas box 14 after second high antiplane mirror 13 reflections, gas box 14 produces with higher hamonic wave and is connected with sniffer 15, the second bundle 400nm light source converges in gas box 14 mutually with the focus of the first bundle 800nm light source, become the two-color laser field of polarized orthogonal, because the light source of 400nm does not produce higher hamonic wave, whole production process is only played the effect of polarization perturbation, be used for the last weak point electronic orbit of selecting of time, so when the angle of regulating between the two-beam source, the focus of 400nm and close between the bundle point and a small amount of error is arranged also in tolerance interval, do not need additional adjustment, at last, the higher hamonic wave that is produced by this double-colored light source enters the generation of higher hamonic wave and collection that sniffer 15 carries out signal is surveyed.
The present invention is simple, operation easily, angle that can the free adjustment two-beam, only need suitably to adjust the shift position of second motor and the rotational angle of first motor, just can realize closing the change of bundle optic angle degree, and by changing flat mirror reflects delayed time system assurance two-beam equivalent optical path, space behavior invariant position between while laser spot and the gas medium, can on time and space, realize the selection control of the length electronic orbit the higher hamonic wave production process simultaneously, remove the influence of long electronic orbit effectively, the advantage that only keeps short electronic orbit, be conducive to the generation of the higher hamonic wave of phase stabilization, be conducive to obtain single chirped pulse, and this time and space two-color laser field control system that can optimize synchronously is suitable for all for the light source of various pulse widths and wavelength, saved cost.
The claimed technology of the present invention is not limited only to the technical characterictic that present embodiment is mentioned, and any the present invention of being subjected to enlightens resulting technical scheme and all falls within protection scope of the present invention.
Claims (7)
1. the generation device of a cross polarization two-color laser field, it comprises femto-second laser, the femto-second laser exit is placed with beam splitting chip, femto-second laser penetrates light and is divided into two bundles by beam splitting chip, a branch of light is injected first condenser lens after entering the plane mirror time-delay mechanism, light enters gas box after first condenser lens focuses on, another Shu Guang is successively through outgoing behind 1/2 wave plate and the frequency-doubling crystal, first plane mirror is housed on the emitting light path, second condenser lens is housed on the emitting light path of first plane mirror, light is injected second plane mirror after second condenser lens focuses on, light is gone into the gas box through the second plane reflection mirror reflection is laggard, the gas box produces with higher hamonic wave and is connected with sniffer, it is characterized in that:
Described second plane mirror is installed on the composition motor, composition motor comprises first motor and second motor, first motor is installed on second motor, first motor can move with second motor along continuous straight runs together, and second plane mirror is contained on first motor and can rotates around first motor shaft together with first motor;
Described first plane mirror is selected dichroic mirror for use;
Described second plane mirror is selected dichroic mirror for use.
2. the generation device of a kind of cross polarization two-color laser as claimed in claim 1 field, it is characterized in that: on the light path between described plane mirror time-delay mechanism and first condenser lens the 3rd plane mirror is installed, light penetrates by injecting first condenser lens again after the 3rd plane reflection mirror reflection from the plane mirror time-delay mechanism.
3. the generation device of a kind of cross polarization two-color laser as claimed in claim 2 field, it is characterized in that: on the light path between described first plane mirror and second condenser lens Siping City's face catoptron and the 5th plane mirror are housed successively, light penetrates by Siping City's face catoptron and the 5th plane reflection mirror reflection are laggard from first plane mirror goes into second condenser lens.
4. the generation device of a kind of cross polarization two-color laser as claimed in claim 2 field, it is characterized in that: described the 3rd plane mirror is plane mirror.
5. the generation device of a kind of cross polarization two-color laser as claimed in claim 3 field, it is characterized in that: described Siping City face catoptron and the 5th plane mirror are all selected dichroic mirror for use.
6. the generation device of a kind of cross polarization two-color laser as claimed in claim 1 field, it is characterized in that: described frequency-doubling crystal is bbo crystal or lbo crystal or ktp crystal.
7. as the generation device of claim 3 or 5 described a kind of cross polarization two-color laser fields, it is characterized in that: described first, second, third and fourth is high antiplane mirror with five plane mirrors.
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| CN 201110415321 CN102494767B (en) | 2011-12-13 | 2011-12-13 | Device for generating orthogonal polarized double-color laser field |
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| CN 201110415321 CN102494767B (en) | 2011-12-13 | 2011-12-13 | Device for generating orthogonal polarized double-color laser field |
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| CN102494767B true CN102494767B (en) | 2013-10-02 |
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| CN103840366B (en) * | 2014-03-07 | 2017-01-25 | 上海理工大学 | Method for achieving terahertz wave center frequency continuous adjustability through pulse laser widening |
| CN116598877B (en) * | 2023-07-14 | 2023-10-31 | 北京大学 | Vacuum ultraviolet light source generating equipment and application system |
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| JP2009053597A (en) * | 2007-08-29 | 2009-03-12 | Hamamatsu Photonics Kk | Wavelength conversion device |
| CN201530059U (en) * | 2009-04-30 | 2010-07-21 | 苏州德龙激光有限公司 | X-Y-theta moving platform applied to LED laser cutting equipment |
| CN102255233A (en) * | 2011-05-24 | 2011-11-23 | 上海理工大学 | Method for regulating and controlling continuous generation of ultraviolet precise spectrums |
| CN102255225A (en) * | 2011-05-20 | 2011-11-23 | 上海理工大学 | Independent chirp parameter regulating system for realizing two-tone laser field |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6765201B2 (en) * | 2000-02-09 | 2004-07-20 | Hitachi, Ltd. | Ultraviolet laser-generating device and defect inspection apparatus and method therefor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009053597A (en) * | 2007-08-29 | 2009-03-12 | Hamamatsu Photonics Kk | Wavelength conversion device |
| CN201530059U (en) * | 2009-04-30 | 2010-07-21 | 苏州德龙激光有限公司 | X-Y-theta moving platform applied to LED laser cutting equipment |
| CN102255225A (en) * | 2011-05-20 | 2011-11-23 | 上海理工大学 | Independent chirp parameter regulating system for realizing two-tone laser field |
| CN102255233A (en) * | 2011-05-24 | 2011-11-23 | 上海理工大学 | Method for regulating and controlling continuous generation of ultraviolet precise spectrums |
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| 刘婷婷等.双光束相干控制产生多次谐波的实验验证.《物理学报》.2003,第52卷(第4期),第864-869页. |
| 双光束相干控制产生多次谐波的实验验证;刘婷婷等;《物理学报》;20030430;第52卷(第4期);第864-869页 * |
| 阿秒脉冲测量的研究进展;霍义萍等;《物理》;20041231;第33卷(第12期);第907-912页 * |
| 霍义萍等.阿秒脉冲测量的研究进展.《物理》.2004,第33卷(第12期),第907-912页. |
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