CN100399653C - High subharmonic generation method of non-collineation - Google Patents

High subharmonic generation method of non-collineation Download PDF

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CN100399653C
CN100399653C CN 200610029572 CN200610029572A CN100399653C CN 100399653 C CN100399653 C CN 100399653C CN 200610029572 CN200610029572 CN 200610029572 CN 200610029572 A CN200610029572 A CN 200610029572A CN 100399653 C CN100399653 C CN 100399653C
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cavity
collinear
laser
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CN1913260A (en )
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曾和平
韩晓红
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华东师范大学
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本发明涉及超快激光技术方向,具体的讲是涉及一种利用介质的非共线非线性转换特性产生高次谐波的方法,该方法由多路光非共线的射入非线性介质中,利用非共线光束的混频特性,无需附加操作即可从腔内导出高次谐波,其优点是更容易取出纯的高次谐波成分,可以实现多色作用下的高次谐波获取,能够提供更高的激光峰值功率,获得更高阶的谐波,在激光载波位相锁定的情况下,可以获得紫外光梳,有利于获得单个的阿秒脉冲。 The present invention relates to a direction ultrafast laser technology, particularly, relates to a method of using a non-linear conversion characteristic of the medium non-collinear high harmonic generation, the method enters a nonlinear medium by the multiplexed optical non-collinear using non-collinear mixed beam characteristics, without additional operations to derive higher harmonic wave from the chamber, the advantage is more easily removed pure harmonic component, high harmonic wave multicolor effect acquired, can provide higher peak power laser to obtain higher order harmonics, in a case where the carrier phase-locked laser, ultraviolet light can be obtained comb conducive a second single pulse obtained.

Description

非共线的高次谐波产生方法技术领域本发明涉及超快激光技术方向,具体的讲是涉及一种利用介质的非共线非线性转换特性产生高次谐波的方法。 Harmonic generating non-collinear TECHNICAL FIELD The present invention relates to a direction ultrafast laser technology, particularly, relates to non-linear conversion characteristic of the non-collinear medium generation method utilizing harmonics. 背景技术超强超短激光科学研究以超强超短激光的创新发展、超强超短激光与物质的相互作用、以及在交叉学科与相关高技术领域中的前沿基础为对象,是当前国际上现代物理学乃至现代科学中一个非常重要的科学前沿领域。 BACKGROUND ultrashort laser science to innovation and development of ultrashort laser, ultrashort laser interaction with matter, as well as cutting-edge interdisciplinary basis and related high-tech fields as an object, is the current internationally modern physics and even modern science in a very important scientific frontier. 在这一领域中精密光谱学的研究在近年取得了前所未有的突破。 Precision spectroscopy of research in recent years has made an unprecedented breakthrough in this area. 在相当长的时期,对时域和频域的精密控制研究是分割在两个不同的领域。 For a long time, research precisely control the time and frequency domain is divided in two different areas. 直到20世纪末,科学家开始对飞秒激光稳频技术的研究突破了光场时域和频域研究领域的隔阂,实现超快激光的载波位相的精确控制,巧妙地将光学频率精密控制、 超短光脉冲产生和非线性光学结合起来,开拓了对光场时-频域同时精密控制研究的新时代。 Until the 20th century, the study of the femtosecond laser frequency stabilization scientists began to break and the gap region when the field frequency domain light field studies, accurate control of the carrier phase of the ultrafast laser, the optical frequency precision skillfully controlled, short when the light pulse generation and nonlinear optical combine to develop a light field - a new era of research precisely controlled frequency domain simultaneously. Science Daily评述认为:现在利用激光,科学家能够在超快时间尺度上更大程度地操控光子,开创了光子源超精密操控科学与技术这一全新前沿领域,使得光钟、光学频率合成与测量、超短光脉冲相干合成、 物理常数精确测定等一些战略高科技研究项目从梦想变成了可实现的目标。 Science Daily commentary said: Now using a laser, scientists can manipulate on the ultrafast time scale to a greater extent photons, creating a photon source ultra-precise control of science and technology in this new frontier, so that optical clocks, optical frequency synthesis and measurement, ultrashort light pulse coherent synthesis, physical constants and some precise determination of strategic high-tech research project from a dream into a goal that can be achieved. 同时由于超精密授时系统的诸多潜在应用,包括通信、航天、卫星导航、空间探测器遥控跟踪、地区救灾,对地球表面以毫米精度成像,以及研究地球旋转及脉沖周期等各种变化,对基础研究的应用包括量子电动力学及基本物理常数的变化,因此对光场时域和频域的精密控制研究愈来愈受到世界各国的高度重视。 Ultra-precision timing and because many potential applications of the system, including communications, aerospace, satellite navigation, tracking remote space probes, disaster areas, the imaging accuracy in millimeters, and the rotation of the Earth and study other changes in the pulse period of the Earth's surface, on the basis of Research applications include changes in quantum electrodynamics and fundamental physical constants, so the precise control of the optical research domain and frequency domain field when more and more highly valued around the world. 对光场在时域-频域同时实现精密控制的技术正在开始推进到极紫外(XUV)和软X射线等超短波段。 Light field in the time domain - on the frequency domain while achieving precise control is started to advance extreme ultraviolet (XUV) and soft X-rays ultrahigh frequency band. 最近,TWHansch小组等将光梳技术延伸到VUV和XUV区域,进一步探索在超快时间尺度与超短波段范畴更大程度地操控光子,将为精密激光光谱学提供新概念与新方法,开辟出新学科前沿。 Recently, TWHansch group and other optical comb technology will extend to the VUV and XUV region, to further explore the ultrafast time scale and scope of the ultrahigh frequency band greater degree of control of photons, new concepts and new methods will provide precision laser spectroscopy, open up new frontier. 例如,2005年的诺贝尔物理学奖公告评论认为:可以用极紫外光学频率梳技术测量He+的ls-2s跃迁的高分辨激光光"i瞽,最终可能产生X射线区域产生原子钟。在光学频率梳技术基础上发展的新一代原子钟由于以高频光波而非微波辐射为基础将促使更精确的时间频率度量方法与标准。极紫外、 软X射线、X射线波段等更高频率范畴的原子钟有望更大幅度的提升时间频率度量的精度。目前对于紫外、极紫外光梳的获取,通常以获取高次谐波为前提。其基本原理在于强激光与介质的非线性相互作用。当激光峰值功率达到约10"W/cn^时,该激光场的电场能量足以与原子的电离能相当,在这种情况下, 强电场很容易使原子发生电离。 For example, the announcement of the Nobel Prize in Physics in 2005, comments that: You can measure the high-resolution laser light "i blind of He + ls-2s transitions with extreme ultraviolet optical frequency comb technique could eventually produce atomic X-ray region generated in the optical frequency development of a new generation of technology based on atomic clocks since the comb-frequency microwave radiation instead of light waves based on time will lead to more accurate frequency standard metrics. extreme ultraviolet, visible for frequencies higher atomic soft X-ray, X-ray and the like are expected band more greatly improved accuracy of the time-frequency metric. at present, for ultraviolet, EUV comb acquired, usually as a precondition obtain higher harmonics. the basic principle is the laser intensity and the nonlinear interaction medium. when the peak power of the laser up to about 10 "W / cn ^, electric field of the laser energy sufficient ionization energy of atoms rather, in this case, a strong electric field is easy to make ionized atoms. 一旦发生电离,自由电子的运动就会受到激光场的控制,而这些电子的动能也很快就会达到初始电离能的数.倍,在这一过程中电离后的自由电子经过碰撞重新与母离子结合,同时释放出高能量的光子,即紫外乃至极紫外的激光。 Once ionization, free electron motion is under control of the laser field, and the kinetic energy of these electrons will soon reach the ionization energy of the initial number. Times, free electrons in the process after re-ionization after the collision with the parent ion binding, while the release of high energy photons, i.e., ultraviolet laser and the extreme ultraviolet. 在此基础上进行载波位相锁定的操作即可以获得该波段的光梳。 Performing carrier phase lock operating on this basis, i.e., the optical comb can be obtained band. 目前光梳技术已较为成熟,并得到较好应用。 Currently comb technology is more mature and get better applied. 目前常见的高次谐波产生系统主要有两种: 一种是将放大后得到的强激光直接与非线性介质相互作用;另外一种方法是激光在无源增强腔(简称为无源腔)的腔内与非线性介质相互作用。 Current common harmonic generation system are mainly two: one is obtained after amplifying the laser interacts directly with the strong nonlinear medium; Another method is enhanced passive cavity laser (simply referred to as a passive cavity) intracavity nonlinear interaction medium. 下面结合附图对这两种高次谐波的产生过程作一介绍:附图l给出了第一种方法的框架图,振荡器出来的激光经过放大(再生放大、多通放大等)后被聚焦透镜(L)聚到非线性介质上,此时激光峰值功率足够强,与介质发生作用,释放出高能量光子,即高次谐波,作用后得光束经过滤波片(F)滤除基波后进入探测器探测。 After l drawings shows a first method of FIG frame, out of the laser oscillator is amplified (regenerative amplification, multipass amplification): in conjunction with the accompanying drawings of these two kinds of higher harmonic generation process of a presentation the focus lens (L) to the poly nonlinear medium, the laser peak power is strong enough at this time, the media play a role, releasing a high-energy photons, i.e., high harmonics, the effect obtained beam passes through the filter plate (F) was filtered off after entering the detector detects the fundamental wave. 这一结构的局限在于此类放大装置是以牺牲激光重复频率为代价的,因此其重复频率通常比较低, 一般不高于千赫兹量级,对于高重复频率难以实现,不利于栽波位相稳定, 不能用于紫外光梳的获取。 Limitations of this structure is that such amplification means at the expense of the cost of the laser repetition frequency, therefore the repetition frequency is usually low, generally no higher than the order of kilohertz, for high repetition rate is difficult to achieve, is not conducive to a stable plant wave phase , ultraviolet light can not be used for acquisition of the comb. 另外采用滤波的方法来取出高次谐波,考虑到材料对投射波段的局限性,以及材料引入的损耗,因此对滤波片的材料以及厚度要求较高。 Another use of the method of filtering to remove high harmonics, taking into account the limitations of the projection material band, and the loss of the introduced material, the material of the filter thickness requirements and higher. 附图2给出了第二种方法的结构示意图,Ml、 M2、 M3、 M4四个镜子构成一激光无源腔,其自由光谱区等同于泵光(来自振荡器)的纵模间隔,从而泵光在腔内形成谐振前后脉冲相干叠加而实现光放大,其放大倍数取决于无源腔腔镜的镀膜,如反射率为99. 9%时,放大倍数为1000倍,反射率为99. 99°/。 Figure 2 shows a schematic view of a second method, Ml, M2, M3, M4 passive four mirrors form a laser cavity, which is equivalent to a free spectral interval of longitudinal modes of the pump light (from the oscillator), so that coating the pump pulse light forming coherent superposition of longitudinal resonator optical amplification is achieved within the cavity, the magnification of the mirror depends on the passive cavity, such as when the reflectance of 99.9%, a magnification of 1,000 times, a reflectance of 99. 99 ° /. 时,放大倍数为IOOOO倍,因此通过改变腔镜的反射率我们就可以得到想要的激光峰值功率。 When the magnification of IOOOO times, so by changing the reflectivity of the mirror we can get the desired peak power laser. 非线性介质置于束腰处,此处光斑最小,光峰值功率最大,当峰值功率足够强时,便可得到高次谐波,高次谐波被插入腔内的布儒斯特片反射到探测装置上。 Nonlinear medium is placed at the beam waist where the beam spot minimum, maximum optical peak power, when the peak power is strong enough, can obtain a higher harmonics, higher harmonic is inserted into the cavity to Brewster reflection sheet detection means. 这里由于基波强度很大,因此插入的布儒斯特片会引入极大的非线性效应,如腔长的改变、色散的引入等,另外还有对基波的损耗等,这些对无源腔的稳定以及激光脉冲的宽度都会产生很大的影响,不利于窄脉冲的获取,从而也影响了高次谐波的产生。 Here the fundamental wave due to the large intensity, so the inserted sheet Brewster introduce significant non-linear effects, such as changing the cavity length, such as the introduction of the dispersion, in addition to the loss of the fundamental wave and the like, these passive stability chamber and the width of the laser pulse will have a huge impact is not conducive to obtaining narrow pulse, which also affects the generation of higher harmonics. 也有专家提出不用布儒斯特片,而是在腔镜M4上打一个微小的孔,以便于高次谐波输出, 但是这一方法在实际操作中却存在很大的困难,因为高次谐波与基波方向上的偏差很小,很难以准确调整。 Some experts do not propose Lancaster piece Brewster, but make a tiny hole in the mirrors M4, so that the higher harmonic output, but this approach but there is great difficulty in practice, because of the high harmonic deviation in the direction of the fundamental wave is small, it is difficult to accurately adjust. 发明内容本发明的目的是根据上述现有技术的不足之处,提供一种利用多腔结构获取高次谐波的方法,该方法由多路光非共线的射入非线性介质中,利用非共线光束的混频特性,无需附加操作即可从腔内导出高次谐波。 Object of the present invention is the above-described shortcomings of the prior art, a method of using a multi-cavity structure to obtain the higher harmonic, which is incident on a nonlinear medium multiplexed optical non-collinear, the use of non-collinear mixed beam characteristics, without additional operations can be derived from the harmonic cavity. 本发明目的实现由以下技术方案完成:一种非共线的高次谐波产生方法,包括激光腔、凹面镜和平面镜的选择, 以及非线性介质的放置,其特征在于该方法至少釆用二个激光腔,且在所述的激光腔中设有由两个凹面镜组成的共焦腔,所述至少二个激光腔的共焦腔的焦点重合为公共焦点,将非线性介质放置于公共焦点。 Object of the present invention is achieved by the complete technical solution: A method of generating a harmonic of the non-collinear, comprising a laser cavity, a concave mirror and the plane mirror is selected, and placing the nonlinear medium, the method characterized in that preclude the use of at least two a laser cavity, and is provided by the confocal cavity composed of two concave mirrors in the laser cavity, said at least two focal confocal cavity laser cavity coinciding public focus, the nonlinear medium is placed in public focus. 所述的至少两个腔中的光束在到达非线性介质时在时间和空间上均要严格同步。 It said at least two light beam cavity are to be strictly synchronized in time and space on the arrival nonlinear medium. 所述的激光腔包括无源腔、振荡腔。 The laser cavity comprises a passive cavity, the cavity oscillation. 所采用的至少两个激光腔可以是均采用无源腔、或者是均采用振荡腔、 或者是既采用无源腔又采用振荡腔。 At least two laser cavity may be used are passive cavity or cavity oscillation are used, or both passive and uses an oscillation chamber cavity. 所述的凹面镜的曲率半径的选择应保证焦点处的光峰值功率满足高次谐波要求。 Selecting a radius of curvature of the concave mirror should ensure that the focal point of the optical peak power of the higher harmonic satisfies the requirements. 所述的非线性介质可以是固体、液体、或者是气体。 The nonlinear medium may be solid, liquid, or gas. 所述的气体非线性介质通常是惰性气体原于及其离于、或者是稳定的团簇。 The gas is typically nonlinear medium and in an inert gas from in the original, or is stable clusters. 所述非线性介质需要置于真空室中。 The nonlinear medium need to be placed in a vacuum chamber. 本发明的优点是更容易取出纯的高次谐波成分,可以实现多色作用下的高次谐波获取,能够提供更高的激光峰值功率,获得更高阶的谐波,在激光栽波位相锁定的情况下,可以获得紫外光梳,有利于获得单个的阿秒脉沖。 Advantage of the invention is more easily removed pure harmonic component, high harmonic wave action multicolor acquisition, provides higher laser peak power, to obtain higher order harmonics, the laser wave planted the case of phase lock can be obtained ultraviolet light comb, help obtain a single attosecond pulse. 附图说明附图1现有技术利用激光放大器获取高次谐波的实验结构示意图; 附图2现有技术利用单个激光无源腔获取高次谐波的实验装置图; 附图3本发明实施例1利用双无源腔获取高次谐波的结构示意图; 附图4本发明实施例2利用双内腔获取高次谐波的结构示意'图; 附图5本发明实施例3利用内腔无源腔组合获取高次谐波的结构示意图; 附图6本发明实施例4利用多无源腔组合获取高次谐波的结构示意图; 附图7本发明实施例5利用多无源腔组合获取高次谐波的结构示意图; 具体实施方式以下结合附图通过实施例对本发明特征及其它相关特征作进一步详细说明,以便于同行业技术人员的理解:本实施例的方法,激光在多腔中分别形成谐振,得到放大,当光峰值功率足够强时,经过非线性介质就会产生高次谐波。 BRIEF DESCRIPTION OF THE DRAWINGS using a prior art laser amplifier schematic experimental configuration obtaining higher harmonics; FIG. 2 prior art using a single passive cavity laser apparatus of FIG obtaining experimental harmonics; FIG. 3 embodiment of the present invention Example 1 a schematic view of a cavity structure using two passive harmonic acquisition; Figure 2 utilizes a dual lumen embodiment acquires a schematic configuration of a harmonic 'the present invention FIG. 4; FIG. 5 of the present invention lumen EXAMPLE 3 passive chamber unit acquires a schematic structural diagram harmonics; passive structural diagram of using a multi-chamber unit acquires harmonics Example 6 of the present invention BRIEF 4; Figure 5 embodiment using a multi-chamber unit passive Example 7 of the present invention Get schematic structural diagram of harmonics; dETAILED DESCRIPTION oF tHE dRAWINGS the following Examples further detail the features of the present invention and other related features to be understood that the skilled person in the industry: the method according to the present embodiment, in multi-cavity laser respectively form a resonance, it can be magnified when the optical peak power is strong enough, through the nonlinear medium will produce high harmonics. 由于光束是非共线相互作用,因此得到的高次谐波也与基波光束分别成一定的角度传输,从而无需另外采取措施分离基波与高次谐波便可进行探测。 Since the beam is non-collinear interaction, so higher harmonics of the fundamental wave is also obtained, respectively, at an angle to the light beam transmission, thus eliminating the need to take additional measures to separate the fundamental and higher harmonics can be detected. 所谓多腔可以是两个激光腔也可以是多个无源腔或者是多个无源腔与一个振荡腔共同作用。 The so-called multi-cavity laser cavity may be two or may be a plurality of chambers or passive interaction chamber and a plurality of passive oscillation chamber. 两个激光腔的情况下,可以是完全相同的两个无源腔或者是完全相同的两个振荡腔(称之为内腔),也可以是一个无源腔和一个内腔。 A case where two laser cavity, may be identical or two passive chambers are identical two oscillating chamber (referred to lumen), or may be a passive chamber and a lumen. 多路光的波长可以相同也可以不同,脉冲宽度可以相同也可以不同。 Wavelength multiplexing of the light may be the same or different pulse widths may be the same or different. 采用无源腔的优点在于可以获得更高的激光峰值功率。 The advantage of using passive cavity laser that can achieve higher peak power. 采用内腔的优点在于更容易实现色散补偿,获得更窄的乃至周期量级的激光脉冲,利于提高高次谐波的产生效率,也便于单个阿秒脉冲的获取。 Lumen in that the advantage of using dispersion compensation easier to obtain even narrower order period of the laser pulses, will help improve the efficiency of generating harmonics, but also facilitate access to a single A second pulse. 所有激光腔中所有的镜片均镀有与所用激光相匹配的宽带高反膜,以保证不损失激光的带宽,可以得到窄脉沖下的高次谐波,同时腔内光峰值功率与镜片的反射率成正比。 All laser cavity all lenses are coated with a broadband laser light matches the high reflective film, to ensure that no loss of bandwidth of the laser, the higher harmonics can be obtained under the narrow pulse, the peak power while reflecting light cavity and the lens rate proportional. 非线性介质可以是固体、液体也可以是气体。 Nonlinear medium may be a solid, a liquid may be a gas. 主要是惰性气体原子及其离子,为提高转换效率也可以釆用稳定的团簇。 Mainly an inert gas atoms and ions, in order to improve the conversion efficiency and also can be used stable clusters. 考虑空气对高次谐波的吸收, 非线性介质需要置于真空室中,也可以将整个设备置于真空室中。 Considering air absorption of higher harmonics, nonlinear medium need to be placed in a vacuum chamber, the entire device may be placed in a vacuum chamber. 在下面的实施例中,以多路光均为中心波长为800nm的脉冲光为例,其他波段以及多色的情况下与该波段实施方法一致。 In the following examples, multiplex light pulses are center wavelength of 800nm ​​light of an example, embodiments consistent with the other bands and band case of a multicolor method. 实施例1:为了有效的获取高次谐波,尽量提高有效入射非线性晶体的光峰值功率是必要的。 Example 1: In order to effectively obtain the higher harmonics, to maximize the peak power of the light incident on the nonlinear crystal is effective necessary. 如图3所示,本方案采用的方法是,将泵浦光耦合进两个完全相同的外置的四镜8字环形无源腔(或者其他结构合适的无源腔),保证无源腔的谐振频率与泵浦光的重复频率相匹配,使激光在无源腔中形成谐振,以达到腔内功率增强的效果,从而使放置在无源腔中的非线性介质可以获得比泵浦光高出几个数量级的有效入射光峰值功率。 , The present embodiment uses the method shown in FIG. 3, the pump light is coupled into the two external four identical 8-shaped ring passive cavity mirror (or other suitable passive cavity configuration), to ensure a passive cavity repetition frequency resonance frequency of the pump light is matched, the laser beam is formed in a passive resonator cavity, the cavity in order to achieve power enhancement effect can be obtained so that the ratio of the pump light in the nonlinear medium is placed passive chamber several orders of magnitude higher than the peak power of the incident light effectively. 图3中标号Mll、 M12、 M21、 M22为镀有650mn〜1000mn宽带高反膜的平面反射镜,M13、 M14、 M23、 M24为具有相同曲率半径的镀有650nm〜1000nm 宽带高反膜的凹面反射镜,所有反射镜的反射率为99. 9%,非线性介质在本实施例中选用惰性气体Xe,其放置在两个无源腔的公共焦点处。 Reference numeral 3 in FIG Mll, M12, M21, M22 is coated with a highly reflective film 650mn~1000mn wideband planar mirror, M13, M14, M23, M24 having a broadband high-reflection film has 650nm~1000nm plating the same radius of curvature concave surface a mirror, all the mirrors of the reflectance of 99.9%, an inert gas selected Xe embodiment of the present embodiment in the nonlinear medium, which is placed at the common focal point of two passive chambers. 将振荡器1输出的激光耦合进由Mll、 M12、 M13、 M14构成的无源腔中。 Couple the laser oscillator 1 is fed by the output Mll, M12, M13, M14 configured as a passive cavity. 将振荡器2输出的激光耦合进由M21、 M22、 M23、 M24构成的无源腔中。 The output from the oscillator 2 by a laser coupled into the M21, M22, M23, M24 constitute the passive cavity. 通过锁腔等外部电路控制,两路光实现时间空间上的完全同步且光峰值功率足够强时,经过非线性介质即可产生高次谐波,并与两基波传输方向以一定的偏离角度输出进入探测装置。 Control lock chamber through an external circuit and the like, two optical achieve complete synchronization and the optical peak power is strong enough, through the nonlinear medium can produce high harmonics on the time and space, and with the two fundamental wave transmission direction at an angle deviation output into the detecting means. 当振荡器l、 2输出的激光绝对位相锁定时,得到的高次谐波的位相也是锁定的,可以得到紫外光梳。 When the laser oscillator is l, 2 output from the absolute phase locking, obtained higher harmonic is phase locked comb ultraviolet light can be obtained. 实施例2:如图4所示,本实施例与实施例1的区别在于将非线性介质直接置于两个结构完全相同的激光振荡器的公共焦点处,由于腔内光功率通常比输出功率高出一到两个数量级,因此也可以达到高次谐波所需的光峰值功率要求, 而且腔内色散补偿更容易实现,更易于获取周期量级窄脉冲,利于提高高次谐波的转换效率,在相位锁定的情况下也更有利于获取单个的阿秒脉冲,可以精确测量紫外波段的原子光谱,便于获取x射线区域的原于钟。 Example 2: 4, the present embodiment differs from Example 1 in that the nonlinear medium is placed directly in the structure of two identical common focal point of the laser oscillator embodiment, since the optical cavity is usually higher than the power output one to two orders of magnitude higher, and therefore can achieve the desired high-order harmonic light peak power requirement, and intracavity dispersion compensation easier to achieve, the order more accessible narrow pulse period, help to improve the conversion of the higher harmonics efficiency, in the case where the phase lock is also more conducive to obtaining a single a second pulse, can accurately measure the atomic spectrum ultraviolet band, to facilitate access to the original x-ray region of the bell. 图4中标号M1、 M2、 M4、 M5、 M7、 M8、 MIO、 Mil为镀有650~1000nm的宽带高反膜的凹面反射镜,其中M1、 M2、 M7、 M8四镜的曲率半径相同,M4、 M5、 MIO、 Mil四镜的曲率半径相同。 4, reference numeral M1, M2, M4, M5, M7, M8, MIO, Mil is a broadband 650 ~ 1000nm concave mirror high reflective film coating, wherein M1, M2, M7, identical M8 four mirror radius of curvature, M4, M5, MIO, Mil same radius of curvature of the four mirrors. M3、 M9为镀有650〜1000nm的宽带高反膜的平面反射镜。 M3, M9 plated broadband planar mirrors 650~1000nm high reflective film. 0C1、 0C2为输出耦合镜,其输出率可以相同或者不同, 同样镀有650〜1000nm的宽带膜。 0C1, 0C2 for the output mirror, the output rate may be the same or different, coated with the same film 650~1000nm of broadband. Tl、 T2为激光增益介质,针对不同的波4殳, 可以选用不同的材料,本实施例中都选用了掺钛蓝宝石(Ti: S)。 Tl, T2 of the laser gain medium, 4 for different wave Shu, different materials can be selected, according to the present embodiment are selected titanium sapphire (Ti: S). N为非线性介质,本实施例中采用惰性气体Xe。 N nonlinear medium employed in the present embodiment, an inert gas Xe. 实施例3:如图5所示,本实施例与实施例1的区别在于将非线性介质置于由一个激光内腔和一个激光无源腔构成的双腔结构的公共焦点处。 Example 3: As shown in FIG 5, the present embodiment differs from embodiment 1 in that the nonlinear medium is placed at the common focal point by a double-lumen structure and a lumen laser passive cavity laser configuration. 这一装置将无源腔的高强度和内腔的短脉沖的优势有效的结合在了一起。 This means effectively combine the advantages of high intensity and short pulse lumen passive cavity together. 图5中标号M1、 M2、 M4、 M5、 M8、 M9为镀有650〜1000nm的宽带高反膜的凹面反射镜,其中Ml与M2、M4与M5、M8与M9曲率半径分别相同。 5 reference numeral M1, M2, M4, M5, M8, M9 broadband 650~1000nm plated concave mirror highly reflective film, wherein Ml and M2, M4 and M5, M8 and M9 are the same as the radius of curvature. M3、M6、M7为镀有650~1000nm 的宽带高反膜的平面反射镜。 M3, M6, M7 plated 650 ~ 1000nm broadband planar mirrors high reflective film. 0C1为输出耦合镜,同样镀有650〜1000nm的宽带膜。 0C1 is output mirror, coated with the same film 650~1000nm of broadband. T为激光增益介质,针对不同的波段,可以选用不同的材料,本实施例中选用了掺钛蓝宝石(Ti: S)。 T is the laser gain medium, for different bands, different materials can be selected, according to the present embodiment, the selected titanium sapphire (Ti: S). N为非线性介质,本实施例中采用惰性气体Xe。 N nonlinear medium employed in the present embodiment, an inert gas Xe. 实施例4:如图6所示,本实施例与实施例1的区别在于在实施例1两个无源腔的基础上又添加了一个同样的无源腔(M31、 M32、 M33、 M34构成),非线性介质置于三个结构完全相同的无源腔的公共焦点处,有三束光共同作用产生高次谐波,其作用原理与实施例1近似。 Example 4: As shown in FIG 6, the present embodiment differs from embodiment 1 in that the embodiment 1 on the basis of two passive chambers on the same has added a passive cavity (M31, M32, M33, M34 constitute ), three nonlinear medium disposed at the common focus point exactly the same structure of the passive cavity, there are three beams together to produce higher harmonics, the principle and effect of Example 1 approximately. 实施例5:如图7所示,本实施例在实施例3的基础上增加了一个内腔(MIO、 Mll、 M12、 M13、 M14、 0C1、 Tl ),非线性介质置于三个腔的公共焦点处。 Example 5: 7, the present embodiment adds a lumen in Example 3 on the basis of (MIO, Mll, M12, M13, M14, 0C1, Tl), the nonlinear medium is placed three chambers public focus. 其作用原理与实施例l近似。 Its mechanism similar to Example l embodiment. 本领域技术人员显然可以认识到,多个无源腔产生高次谐波的情况并不局限于实施例4所述内容,在实验空间条件允许的情况下可以按需要增加无源腔的个数,同样也可以在实施例3的基础上按需增加新的无源腔或者是内腔,另外在这里相互作用的多束光并不一定是完全相同的,其波段和脉沖宽度都可以不同,无源腔之间的结构可以不同,内腔的结构也可以不同。 Be apparent to persons skilled in the art recognize that, where a plurality of passive harmonic generating chambers is not limited to the contents described in Example 4, the passive cavity can be increased as required in the case of experimental conditions allow space number , can also be increased on the basis of the embodiment 3 of the new demand passive cavity or lumen, here additional multi-beam light interaction is not necessarily exactly the same, and the pulse width of the band which can be different, the structure may be different between the passive cavity, the inner cavity structure may be different. 在激光相位锁定的情况下,上述装置都可以获得紫外光^f危。 In the case of laser phase-locked, the apparatus can get ^ f dangerous ultraviolet light.

Claims (9)

  1. 1. 一种非共线的高次谐波产生方法,包括激光腔、凹面镜和平面镜的选择,以及非线性介质的放置,其特征在于该方法至少采用二个激光腔,且在所述的激光腔中设有由两个凹面镜组成的共焦腔,所述至少二个激光腔的共焦腔的焦点重合为公共焦点,将非线性介质放置于公共焦点。 A non-collinear harmonic generation method, comprising a laser cavity, a concave mirror and the plane mirror is selected, and placing the nonlinear medium, characterized in that the method using at least two laser cavity, and in the the laser cavity is provided by the confocal cavity composed of two concave mirrors, the at least two focal confocal cavity laser cavity coinciding public focus, the nonlinear medium is placed at a common focus.
  2. 2、 根据权利要求1所述的一种非共线的高次谐波产生方法,其特征在于所述的至少两个激光腔中的光束在到达非线性介质时在时间和空间上均要严格同步。 2. A method of generating a harmonic of the non-collinear according to claim 1, wherein said at least two light beams in the laser cavity in a nonlinear medium on the arrival time and space are strictly Synchronize.
  3. 3、 根据权利要求1所述的一种非共线的高次谐波产生方法,其特征在于所述的激光腔指的是无源腔或者是振荡腔。 3, according to the method of generating a harmonic of a non-collinear according to claim 1, characterized in that said laser cavity means a passive cavity or cavity oscillation.
  4. 4、 根据权利要求1所述的一种非共线的高次谐波产生方法,其特征在于所采用的至少两个激光腔是均采用无源腔或者是均采用振荡腔或者是既采用无源腔又采用振荡腔。 4. The method of generating a harmonic of the non-collinear according to claim 1, characterized in that the at least two laser chambers are used is a passive cavity or cavity are used, or both the oscillation-free using the source chamber and the cavity oscillation.
  5. 5、 根据权利要求1所述的一种非共线的高次谐波产生方法,其特征在于所述的凹面镜及平面镜镀有与所用激光相匹配的宽带高反膜。 5, the higher harmonics according to claim one non-collinear generating method of claim 1, wherein said planar mirror and a concave mirror coated with a broadband laser light matches the high reflective film.
  6. 6、 根据权利要求1所述的一种非共线的高次谐波产生方法,其特征在于所述的凹面镜的曲率半径的选择应保证焦点处的光峰值功率满足高次谐波要求。 6, according to the method of generating a harmonic of a non-collinear according to claim 1, characterized in that the selection of the radius of curvature of the concave mirror should ensure that the focal point of the optical peak power of the higher harmonic satisfies the requirements.
  7. 7、 根据权利要求1所述的一种非共线的高次谐波产生方法,其特征在于所述的非线性介质是固体、液体或者是气体。 7, according to the method of generating a harmonic of a non-collinear according to claim 1, wherein said nonlinear medium is a solid, a liquid or a gas.
  8. 8、 根据权利要求7所述的一种非共线的高次谐波产生方法,其特征在于所述的气体非线性介质是惰性气体原子及其离子或者是稳定的团簇。 8, according to claim higher harmonics of a non-collinear generating method of claim 7, wherein said nonlinear medium is a gas and an inert gas atoms or ions stabilized clusters.
  9. 9、 根据权利要求1所述的一种非共线的高次谐波产生方法,其特征在于所述非线性介质需要置于真空室中。 9, according to a non-harmonic collinear generating method according to claim 1, wherein said nonlinear medium is placed in the vacuum chamber needs.
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