CN100399653C - High subharmonic generation method of non-collineation - Google Patents
High subharmonic generation method of non-collineation Download PDFInfo
- Publication number
- CN100399653C CN100399653C CNB2006100295728A CN200610029572A CN100399653C CN 100399653 C CN100399653 C CN 100399653C CN B2006100295728 A CNB2006100295728 A CN B2006100295728A CN 200610029572 A CN200610029572 A CN 200610029572A CN 100399653 C CN100399653 C CN 100399653C
- Authority
- CN
- China
- Prior art keywords
- laser
- collineation
- generation method
- cavity
- nonlinear dielectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Abstract
This invention relates to a method for generating high-order harmonic waves utilizing the non-collinear non-linear conversion property of medium, which utilizes the mixing property of non-linear beams to lead out high order harmonic waves from the cavity without additional operations in the emitted non-linear medium. The advantage is that it is easier to pick up pure high-order harmonic wave composition to obtain the harmonic waves under the multi-color action and provide even higher laser peak power.
Description
Technical field
The present invention relates to the ultrafast laser technique direction, relate to a kind of method of utilizing the non-colinear non-linear conversion characteristic generation high order harmonic component of medium concretely.
Background technology
Superpower ultrashort laser scientific research is object with the innovation and development of superpower ultrashort laser, superpower ultrashort laser with the interaction and the basis, forward position in cross discipline and relevant high-tech sector of material, is very important science frontier field in current modern physics in the world and even the modern science.The research of precision spectroscopy has obtained unprecedented breakthrough in recent years in this field.In quite long period, be to be segmented in two different fields to the accurate Control Study of time domain and frequency domain.Up to 20 end of the centurys, scientist begins the research of femtosecond laser Frequency Stabilization Technique has been broken through the estrangement in light field time domain and Frequency domain field, realize the accurate control of the carrier wave position phase of ultrafast laser, dexterously the accurate control of optical frequency, ultrashort light pulse generation and nonlinear optics are combined, opened up New Times accurate Control Study of light field time and frequency zone while.Science Daily comments and thinks: utilize laser now, scientist can control photon to a greater degree on ultrafast time scale, started the photon source ultraprecise and controlled this field, brand-new forward position of science and technology, make light clock, optical frequency synthetic with relevant synthetic, the physical constant of measurement, ultrashort light pulse accurately some strategic high-tech research projects such as mensuration become attainable target from dream.Simultaneously because the many potential application of ultraprecise time dissemination system, comprise communication, space flight, satellite navigation, space probe remote tracking, the regional disaster relief, to earth surface with the imaging of millimeter precision, and various variations such as rotation of the research earth and pulse period, the application of basic research is comprised the variation of quantrm electrodynamics and physics constant, so the accurate Control Study of light field time domain and frequency domain more and more is subjected to the great attention of countries in the world.
Light field is realized simultaneously that at time domain-frequency domain the technology of accurate control is beginning to be advanced to ultra-short wave bands such as extreme ultraviolet (XUV) and grenz ray.Recently, T.W.Hansch group etc. extends to VUV and XUV zone with light comb technology, further explore and control photon to a greater degree, will provide new ideas and new method, open up the subject forward position that makes new advances for precise laser spectroscopy in ultrafast time scale and ultra-short wave band category.For example, the comment of Nobel Prize in physics in 2005 bulletin is thought: can use extreme ultraviolet optics frequency comb commercial measurement He
+The high-resolution laser spectroscopy of 1s-2s transition, finally may produce the X ray zone and produce atomic clock.The atomic clock of new generation that develops on the optical frequency com technical foundation is because with the high frequency light wave but not microwave radiation is the basis will impel more precise time frequency measure and standard.The atomic clock of higher frequency categories such as extreme ultraviolet, grenz ray, X ray wave band is expected to the precision of lifting temporal frequency tolerance by a larger margin.
For obtaining that ultraviolet, extreme ultraviolet are combed, be prerequisite to obtain high order harmonic component usually at present.Its basic principle is the nonlinear interaction of light laser and medium.When laser peak power reaches about 10
14W/cm
2The time, it is suitable with the ionization energy of atom that the electric field energy of this laser field is enough to, and in this case, highfield is easy to make atom generation ionization.In case generation ionization, the motion of free electron will be subjected to the control of laser field, and the kinetic energy of these electronics also will soon reach the several times of initial ionization energy, free electron after the ionization combines with parent ion again through collision in this course, discharge high-octane photon simultaneously, i.e. the laser of ultraviolet and even extreme ultraviolet.The operation of carrying out the carrier wave phase locking on this basis promptly can obtain the light comb of this wave band.Light comb technology is comparatively ripe at present, and is better used.
Common high order harmonic component generation system mainly contains two kinds at present: a kind of is the direct and nonlinear dielectric interaction of light laser that will obtain after will amplifying; Another method is that laser interacts with nonlinear dielectric in the chamber in passive enhancing chamber (abbreviating passive cavity as).Make a presentation below in conjunction with the production process of accompanying drawing these two kinds of high order harmonic components:
Accompanying drawing 2 has provided the structural representation of second method, M1, M2, four mirrors of M3, M4 constitute a laser passive chamber, its free spectral range is equal to the longitudinal mode spacing of pump light (from oscillator), pulse coherence superposes and the realization light amplification thereby pump light forms resonance in the chamber before and after, its multiplication factor depends on the plated film of passive cavity chamber mirror, as reflectivity is 99.9% o'clock, multiplication factor is 1000 times, reflectivity is 99.99% o'clock, therefore multiplication factor is 10000 times, our laser peak power that just can obtain wanting of the reflectivity by changing the chamber mirror.Nonlinear dielectric places place with a tight waist, hot spot minimum herein, and photopeak value power maximum when peak power enough by force the time, just can obtain high order harmonic component, and the Brewster sheet that high order harmonic component is inserted in the chamber reflexes on the sniffer.Here because first-harmonic intensity is very big, therefore great nonlinear effect is introduced in the Brewster sector-meeting of inserting, as the long change in chamber, the introducing of chromatic dispersion etc., also have the loss of first-harmonic in addition etc., these width stable and laser pulse to passive cavity all can produce very big influence, be unfavorable for obtaining of burst pulse, thereby also influenced the generation of high order harmonic component.Also there is the expert to propose without the Brewster sheet, but on the mirror M4 of chamber, make a call to a small hole, so that high order harmonic component output, but but there is very big difficulty in this method in practical operation, because the deviation on high order harmonic component and the first-harmonic direction is very little, be difficult to accurate adjustment.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, a kind of method of utilizing multi-cavity structure to obtain high order harmonic component is provided, this method is injected in the nonlinear dielectric by multichannel light is non-colinear, utilize the mixed frequency characteristic of non-colinear light beam, need not additional operations and can in the chamber, derive high order harmonic component.
The object of the invention realizes being finished by following technical scheme:
A kind of high subharmonic generation method of non-collineation, comprise the selection of laser cavity, concave mirror and level crossing, and the placement of nonlinear dielectric, it is characterized in that this method adopts two laser cavities at least, and in described laser cavity, be provided with the confocal cavity of forming by two concave mirrors, the focus of the confocal cavity of described at least two laser cavities overlaps to public focus, and nonlinear dielectric is positioned over public focus.
Light beam in described at least two chambeies is all wanted strict synchronism on time and space when arriving nonlinear dielectric.
Described laser cavity comprises passive cavity, vibration chamber.
At least two laser cavities that adopted can be all to adopt passive cavity or all adopt to vibrate the chamber or not only adopt passive cavity but also adopt the vibration chamber.
The selection of the radius of curvature of described concave mirror should guarantee that the photopeak value power at focus place satisfies the high order harmonic component requirement.
Described nonlinear dielectric can be solid, liquid or gas.
Described gas nonlinear dielectric is intert-gas atoms and ion or stable cluster normally.
Described nonlinear dielectric need place vacuum chamber.
Advantage of the present invention is the pure high order harmonic component composition of easier taking-up, can realize that the high order harmonic component under the multi-coloured action obtains, higher laser peak power can be provided, obtain the more harmonic wave of high-order, under the situation of laser carrier phase locking, can obtain ultraviolet comb, help obtaining single chirped pulse.
Description of drawings
Accompanying drawing 1 prior art utilizes laser amplifier to obtain the experiment structural representation of high order harmonic component;
Accompanying drawing 2 prior aries utilize single laser passive chamber to obtain the Experimental equipment of high order harmonic component;
Accompanying drawing 3 embodiment of the invention 1 utilize two passive cavities to obtain the structural representation of high order harmonic component;
Accompanying drawing 4 embodiment of the invention 2 utilize two inner chambers to obtain the structural representation of high order harmonic component;
Accompanying drawing 5 embodiment of the invention 3 utilize the combination of inner chamber passive cavity to obtain the structural representation of high order harmonic component;
Accompanying drawing 6 embodiment of the invention 4 utilize many passive cavity combinations to obtain the structural representation of high order harmonic component;
Accompanying drawing 7 embodiment of the invention 5 utilize many passive cavity combinations to obtain the structural representation of high order harmonic component;
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technical staff's of the same trade understanding:
The method of present embodiment, laser form resonance respectively in multi-cavity, obtain amplifying, and when photopeak value power is enough strong, will produce high order harmonic component through nonlinear dielectric.Interact because light beam is a non-colinear, therefore the high order harmonic component that obtains also with the transmission that has a certain degree respectively of first-harmonic light beam, thereby need not to take measures to separate first-harmonic in addition and high order harmonic component just can be surveyed.
So-called multi-cavity can be that two laser cavities also can be a plurality of passive cavities or a plurality of passive cavity and a vibration chamber acting in conjunction.Under the situation of two laser cavities, can be identical two passive cavities or identical two vibration chambeies (being referred to as inner chamber), also can be a passive cavity and an inner chamber.The multichannel light wavelength can be the same or different, and pulse duration can be the same or different.
Adopt the advantage of passive cavity to be to obtain higher laser peak power.Adopt the advantage of inner chamber to be easier realization dispersion compensation, obtain narrower and even the laser pulse cycle magnitude, be beneficial to the generation efficient that improves high order harmonic component, also be convenient to obtaining of single chirped pulse.
All eyeglasses all are coated with the broadband high-reflecting film that is complementary with used laser in all laser cavities, and the bandwidth to guarantee not lose laser can obtain the high order harmonic component under the burst pulse, and photopeak value power is directly proportional with the reflectivity of eyeglass in the chamber simultaneously.
Nonlinear dielectric can be that solid, liquid also can be gas.Mainly be intert-gas atoms and ion thereof, also can adopt stable cluster for improving conversion efficiency.Consider the absorption of air to high order harmonic component, nonlinear dielectric need place vacuum chamber, also entire equipment can be placed vacuum chamber.
In the following embodiments, being centre wavelength with multichannel light is that the pulsed light of 800nm is an example, consistent with this wave band implementation method under the situation of its all band and polychrome.
Embodiment 1:
In order effectively to obtain high order harmonic component, the photopeak value power that as far as possible improves effective incident nonlinear crystal is necessary.As shown in Figure 3, the method that this programme adopts is, pump light is coupled into two identical external four mirrors, 8 words annular passive cavities (the perhaps suitable passive cavity of other structures), guarantee that the resonance frequency of passive cavity and the repetition rate of pump light are complementary, make laser in passive cavity, form resonance, reaching the effect that intracavity power strengthens, thereby make the nonlinear dielectric that is placed in the passive cavity can obtain to exceed effective incident light peak power of several magnitude than pump light.
Label M11, M12, M21, M22 are the plane mirror that is coated with 650nm～1000nm broadband high-reflecting film among Fig. 3, M13, M14, M23, M24 are the concave mirror that is coated with 650nm～1000nm broadband high-reflecting film with same curvature radius, the reflectivity of all speculums is 99.9%, nonlinear dielectric is selected inert gas Xe in the present embodiment for use, and it is placed on the public focus place of two passive cavities.
The laser coupled of oscillator 1 output is advanced in the passive cavity that is made of M11, M12, M13, M14.The laser coupled of oscillator 2 outputs is advanced in the passive cavity that is made of M21, M22, M23, M24.By external circuit controls such as lock chambeies, when two-way light realizes that the synchronous fully and photopeak value power on the time and space is enough strong, can produce high order harmonic component, and enter sniffer with certain deviation angle output with two first-harmonic transmission directions through nonlinear dielectric.When the absolute phase locking of laser of oscillator 1,2 output, the position of the high order harmonic component that obtains also locks mutually, can obtain ultraviolet comb.
Embodiment 2:
As shown in Figure 4, the difference of present embodiment and embodiment 1 is nonlinear dielectric is directly placed the public focus place of two identical in structure laser oscillators, because the common specific power output of luminous power exceeds one to two order of magnitude in the chamber, therefore also can reach the required photopeak value power requirement of high order harmonic component, and the easier realization of chamber internal dispersion compensation, be easier to obtain cycle magnitude burst pulse, be beneficial to the conversion efficiency that improves high order harmonic component, under the situation of phase locking, also more help obtaining single chirped pulse, can accurately measure the atom spectrum of ultraviolet band, be convenient to obtain the atomic clock in X ray zone.
Label M1, M2, M4, M5, M7, M8, M10, M11 are the concave mirror that is coated with the broadband high-reflecting film of 650～1000nm among Fig. 4, and wherein the radius of curvature of M1, M2, M7, M8 four mirrors is identical, and the radius of curvature of M4, M5, M10, M11 four mirrors is identical.M3, M9 are the plane mirror that is coated with the broadband high-reflecting film of 650～1000nm.OC1, OC2 are output coupling mirror, and its output rating can be identical or different, are coated with the broadband film of 650～1000nm equally.T1, T2 are gain medium, at different wave bands, can select different materials for use, have all selected titanium-doped sapphire (Ti:S) in the present embodiment for use.N is a nonlinear dielectric, adopts inert gas Xe in the present embodiment.
Embodiment 3:
As shown in Figure 5, the difference of present embodiment and embodiment 1 is nonlinear dielectric is placed the public focus place of the double cavity structure that is made of a laser inner chamber and laser passive chamber.This device effectively is combined togather the advantage of the short pulse of the high strength of passive cavity and inner chamber.Label M1, M2, M4, M5, M8, M9 are the concave mirror that is coated with the broadband high-reflecting film of 650～1000nm among Fig. 5, and wherein M1 is identical respectively with the M9 radius of curvature with M2, M4 and M5, M8.M3, M6, M7 are the plane mirror that is coated with the broadband high-reflecting film of 650～1000nm.OC1 is an output coupling mirror, is coated with the broadband film of 650～1000nm equally.T is a gain medium, at different wave bands, can select different materials for use, has selected titanium-doped sapphire (Ti:S) in the present embodiment for use.N is a nonlinear dielectric, adopts inert gas Xe in the present embodiment.
Embodiment 4:
As shown in Figure 6, the difference of present embodiment and embodiment 1 is to have added again a same passive cavity (M31, M32, M33, M34 constitute) on the basis of 1 two passive cavities of embodiment, nonlinear dielectric places the public focus place of three identical in structure passive cavities, have the three-beam acting in conjunction to produce high order harmonic component, its action principle and embodiment 1 are approximate.
Embodiment 5:
As shown in Figure 7, present embodiment has increased an inner chamber (M10, M11, M12, M13, M14, OC1, T1) on the basis of embodiment 3, and nonlinear dielectric places the public focus place in three chambeies.Its action principle and embodiment 1 are approximate.
Those skilled in the art obviously can recognize, the situation that a plurality of passive cavities produce high order harmonic component is not limited to embodiment 4 described contents, under the situation of lab space conditions permit, can increase the number of passive cavity on demand, equally also can on the basis of embodiment 3, increase new passive cavity or inner chamber as required, interactional here in addition multi-beam might not be identical, its wave band can be different with pulse duration, structure between the passive cavity can be different, and the structure of inner chamber also can be different.Under the situation of laser phase locking, said apparatus can obtain ultraviolet comb.
Claims (9)
1. high subharmonic generation method of non-collineation, comprise the selection of laser cavity, concave mirror and level crossing, and the placement of nonlinear dielectric, it is characterized in that this method adopts two laser cavities at least, and in described laser cavity, be provided with the confocal cavity of forming by two concave mirrors, the focus of the confocal cavity of described at least two laser cavities overlaps to public focus, and nonlinear dielectric is positioned over public focus.
2. a kind of high subharmonic generation method of non-collineation according to claim 1 is characterized in that the light beam in described at least two laser cavities is all wanted strict synchronism when arriving nonlinear dielectric on time and space.
3. a kind of high subharmonic generation method of non-collineation according to claim 1 is characterized in that described laser cavity refers to passive cavity or vibration chamber.
4. a kind of high subharmonic generation method of non-collineation according to claim 1 is characterized in that at least two laser cavities that adopted are all to adopt passive cavity or all adopt to vibrate the chamber or not only adopt passive cavity but also adopt the vibration chamber.
5. a kind of high subharmonic generation method of non-collineation according to claim 1 is characterized in that described concave mirror and level crossing are coated with the broadband high-reflecting film that is complementary with used laser.
6. a kind of high subharmonic generation method of non-collineation according to claim 1 is characterized in that the selection of the radius of curvature of described concave mirror should guarantee that the photopeak value power at focus place satisfies the high order harmonic component requirement.
7. a kind of high subharmonic generation method of non-collineation according to claim 1 is characterized in that described nonlinear dielectric is solid, liquid or gas.
8. a kind of high subharmonic generation method of non-collineation according to claim 7 is characterized in that described gas nonlinear dielectric is intert-gas atoms and ion or stable cluster.
9. a kind of high subharmonic generation method of non-collineation according to claim 1 is characterized in that described nonlinear dielectric need place vacuum chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100295728A CN100399653C (en) | 2006-07-31 | 2006-07-31 | High subharmonic generation method of non-collineation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100295728A CN100399653C (en) | 2006-07-31 | 2006-07-31 | High subharmonic generation method of non-collineation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1913260A CN1913260A (en) | 2007-02-14 |
| CN100399653C true CN100399653C (en) | 2008-07-02 |
Family
ID=37722090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100295728A Expired - Fee Related CN100399653C (en) | 2006-07-31 | 2006-07-31 | High subharmonic generation method of non-collineation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100399653C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975866B (en) * | 2010-08-13 | 2011-12-14 | 中国科学院上海光学精密机械研究所 | Device and method for measuring diffusion velocity of electronic wave packet |
| CN110908128B (en) * | 2019-11-08 | 2021-09-07 | 中国科学院上海光学精密机械研究所 | Multicolor ultrafast laser generating device |
| CN114486750B (en) * | 2022-01-20 | 2023-12-26 | 华中科技大学 | Method for distinguishing molecular chirality and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060742A (en) * | 1990-10-11 | 1992-04-29 | 中国科学院上海光学精密机械研究所 | Chamber type higher harmonic laser device |
| US5644424A (en) * | 1996-03-18 | 1997-07-01 | Washington State University Research Foundation | Laser amplifier and method |
| CN1518177A (en) * | 2003-01-17 | 2004-08-04 | ��ʽ����Orc������ | Wavelength conversion laser device |
| CN1536721A (en) * | 2003-04-11 | 2004-10-13 | ��ʽ����Orc������ | Laser device and laser wavelength converter |
| US20060092993A1 (en) * | 2004-11-01 | 2006-05-04 | Chromaplex, Inc. | High-power mode-locked laser device |
-
2006
- 2006-07-31 CN CNB2006100295728A patent/CN100399653C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1060742A (en) * | 1990-10-11 | 1992-04-29 | 中国科学院上海光学精密机械研究所 | Chamber type higher harmonic laser device |
| US5644424A (en) * | 1996-03-18 | 1997-07-01 | Washington State University Research Foundation | Laser amplifier and method |
| CN1518177A (en) * | 2003-01-17 | 2004-08-04 | ��ʽ����Orc������ | Wavelength conversion laser device |
| CN1536721A (en) * | 2003-04-11 | 2004-10-13 | ��ʽ����Orc������ | Laser device and laser wavelength converter |
| US20060092993A1 (en) * | 2004-11-01 | 2006-05-04 | Chromaplex, Inc. | High-power mode-locked laser device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1913260A (en) | 2007-02-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Senfftleben et al. | Highly non-linear ionization of atoms induced by intense high-harmonic pulses | |
| Chang | Chirp of the single attosecond pulse generated by a polarization gating | |
| Hädrich et al. | Single-pass high harmonic generation at high repetition rate and photon flux | |
| Mücke et al. | Toward waveform nonlinear optics using multimillijoule sub-cycle waveform synthesizers | |
| Kandula et al. | Extreme ultraviolet frequency comb metrology | |
| Cerullo et al. | Ultrafast optical parametric amplifiers | |
| Rudawski et al. | Carrier-envelope phase dependent high-order harmonic generation with a high-repetition rate OPCPA-system | |
| Ganichev et al. | Intense terahertz excitation of semiconductors | |
| Kryukov | Ultrashort-pulse lasers | |
| Kung | Generation of tunable picosecond VUV radiation | |
| Mahon et al. | Nonlinear generation of Lyman‐alpha radiation | |
| CN103762496B (en) | Astronomicalc optics frequency comb device based on all solid state femto-second laser | |
| CN103972769B (en) | Method for broadening ultraviolet supercontinuum spectrum by additionally adding TeraHertz wave field | |
| CN111525379B (en) | Broadband topology load tunable Laguerre Gaussian optical parameter oscillator | |
| Mukhin et al. | Design of the front-end system for a subexawatt laser of the XCELS facility | |
| CN101677173B (en) | Generation method and device of intermediate infrared femtosecond laser pulse with self-stabilized carrier phase | |
| Ishii et al. | Generation of ultrashort intense optical pulses at 1.6 μm from a bismuth triborate-based optical parametric chirped pulse amplifier with carrier-envelope phase stabilization | |
| CN100399653C (en) | High subharmonic generation method of non-collineation | |
| Comby et al. | Bright, polarization-tunable high repetition rate extreme ultraviolet beamline for coincidence electron–ion imaging | |
| CN100403607C (en) | Method for generating higher harmonic wave in cavity | |
| Vozzi et al. | Advances in laser technology for isolated attosecond pulse generation | |
| CN102255233B (en) | Method for regulating and controlling continuous generation of ultraviolet precise spectrums | |
| US3801797A (en) | Optical radiation frequency converter employing phase matched mixtures of inert gases and method | |
| Bayanov et al. | Parametric generation of high-peak-power femtosecond light pulses in LBO crystal | |
| Losev et al. | THL-100 multi-terawatt laser system of a visible range |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080702 Termination date: 20130731 |