CN111555101A - A device for generating laser pulse train with adjustable frequency chirp - Google Patents
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Abstract
本发明公开了一种产生频率啁啾可调的激光脉冲串的装置，包括：初始激光展宽单元、啁啾控制单元和激光拍频单元；其中：初始激光展宽单元包括：激光器和展宽器，其中，展宽器包括：第一分束镜、第一色散介质和第一反射模块；啁啾控制单元包括：第二色散介质和第二反射模块；激光拍频单元包括：第二分束镜和反射镜。本发明能够有效的产生中心频率和啁啾大范围可调谐的太赫兹辐射源。
The invention discloses a device for generating a laser pulse train with adjustable frequency chirp, comprising: an initial laser stretching unit, a chirp control unit and a laser beat frequency unit; wherein: the initial laser stretching unit includes: a laser and a stretcher, wherein , the stretcher includes: a first beam splitter, a first dispersion medium and a first reflection module; the chirp control unit includes: a second dispersion medium and a second reflection module; the laser beat frequency unit includes: a second beam splitter and a reflection module mirror. The invention can effectively generate a terahertz radiation source with a wide range of tunable center frequency and chirp.
Description
技术领域technical field
本发明涉及超快激光技术领域，尤其涉及一种产生频率啁啾可调的激光脉冲串的装置。The invention relates to the technical field of ultrafast lasers, in particular to a device for generating a laser pulse train with adjustable frequency chirp.
背景技术Background technique
目前，太赫兹波在物理学、生命科学、材料科学、成像技术、通信技术以及国家安全等多个领域具有广阔的应用前景，受到了国内外科学家的普遍关注。At present, terahertz waves have broad application prospects in many fields such as physics, life science, materials science, imaging technology, communication technology, and national security, and have attracted widespread attention from scientists at home and abroad.
窄带宽的太赫兹光源已成功应用于量子材料中实现拉比振荡，其原则上可以将量子材料由一个初始态转换成任意的终态。绝热快速通道技术利用具有频率啁啾特性的光脉冲(即光脉冲在不同纵向位置的瞬时频率覆盖从远低于到远高于两个量子态之间的共振频率)对量子系统进行相干操控，可大幅提高量子态之间的布局转移效率和稳定性。该技术已在光学波段获得了成功，但是由于缺乏相应的太赫兹辐射源，尚未应用于太赫兹波段。Narrow-bandwidth terahertz light sources have been successfully applied to achieve Rabi oscillations in quantum materials, which in principle can transform quantum materials from an initial state to an arbitrary final state. Adiabatic fast-channel technology utilizes optical pulses with frequency chirp characteristics (that is, the instantaneous frequency of optical pulses at different longitudinal positions covers from far below to far above the resonant frequency between two quantum states) for coherent manipulation of quantum systems, The layout transfer efficiency and stability between quantum states can be greatly improved. This technique has been successful in the optical band, but it has not been applied to the THz band due to the lack of a corresponding THz radiation source.
利用纵向周期性调制的激光脉冲串可用于产生窄带宽太赫兹辐射脉冲，但现有的激光脉冲堆积方案以及激光脉冲拍频技术方案均只能产生激光脉冲瞬时调制频率不变的均匀激光脉冲串，其所产生的太赫兹辐射源不具备频率啁啾的性能。为获得具有频率啁啾特性的太赫兹辐射源，研究人员提出利用非线性啁啾的激光脉冲进行拍频产生啁啾可控的太赫兹辐射源。该方案通过设置激光脉冲进入“基于光栅对的激光脉冲展宽器”的入射角度，使得脉冲展宽器中的光栅引入的三阶色散较大从而得到非线性啁啾的激光脉冲；所产生的非线性啁啾激光脉冲通过激光脉冲拍频得到频率啁啾的激光脉冲串，而后激发相应的辐射介质得到频率啁啾可控的太赫兹辐射源；并通过控制该角度实现频率啁啾的调节。由于激光脉冲入射光栅的角度较大，难以保证激光脉冲在“基于光栅对的激光脉冲展宽器”中的无阻拦通过，同时其所产生太赫兹辐射频率啁啾的调节范围也很有限。Laser pulse trains using longitudinal periodic modulation can be used to generate narrow-bandwidth terahertz radiation pulses, but the existing laser pulse stacking schemes and laser pulse beat frequency technical schemes can only generate uniform laser pulse trains with constant laser pulse instantaneous modulation frequency , the terahertz radiation source generated by it does not have the performance of frequency chirp. In order to obtain a terahertz radiation source with frequency chirp characteristics, the researchers propose to use nonlinear chirped laser pulses to generate a chirped controllable terahertz radiation source at the beat frequency. In this scheme, by setting the incident angle of the laser pulse into the "laser pulse stretcher based on grating pair", the third-order dispersion introduced by the grating in the pulse stretcher is larger, so that a nonlinear chirped laser pulse can be obtained; The chirped laser pulse obtains a laser pulse train with chirped frequency through the beat frequency of the laser pulse, and then excites the corresponding radiation medium to obtain a terahertz radiation source with controllable frequency chirp; and the frequency chirp is adjusted by controlling the angle. Due to the large angle of the laser pulse entering the grating, it is difficult to ensure the unobstructed passage of the laser pulse in the "laser pulse stretcher based on grating pair", and the adjustment range of the frequency chirp of the generated terahertz radiation is also very limited.
因此，如何有效的产生中心频率和啁啾大范围可调谐的太赫兹辐射源，是一项亟待解决的问题。Therefore, how to effectively generate a large-scale tunable terahertz radiation source with center frequency and chirp is an urgent problem to be solved.
发明内容SUMMARY OF THE INVENTION
有鉴于此，本发明提供了一种产生频率啁啾可调的激光脉冲串的装置，能够有效的产生中心频率和啁啾大范围可调谐的太赫兹辐射源。In view of this, the present invention provides a device for generating a laser pulse train with tunable frequency chirp, which can effectively generate a terahertz radiation source with a wide range of tunable center frequency and chirp.
本发明提供了一种产生频率啁啾可调的激光脉冲串的装置，包括：初始激光展宽单元、啁啾控制单元和激光拍频单元；其中：所述初始激光展宽单元包括：激光器和展宽器，其中，所述展宽器包括：第一分束镜、第一色散介质和第一反射模块；所述啁啾控制单元包括：第二色散介质和第二反射模块；所述激光拍频单元包括：第二分束镜和反射镜；其中：The invention provides a device for generating a laser pulse train with adjustable frequency chirp, comprising: an initial laser stretching unit, a chirp control unit and a laser beat frequency unit; wherein: the initial laser stretching unit includes: a laser and a stretcher , wherein the stretcher includes: a first beam splitter, a first dispersion medium and a first reflection module; the chirp control unit includes: a second dispersion medium and a second reflection module; the laser beat frequency unit includes : second beam splitter and mirror; where:
所述激光器产生的超短飞秒脉冲通过所述第一分束镜后进入所述第一色散介质，然后通过所述第一反射模块形成啁啾展宽脉冲；The ultra-short femtosecond pulse generated by the laser enters the first dispersion medium after passing through the first beam splitter, and then forms a chirped broadened pulse through the first reflection module;
所述啁啾展宽脉冲通过所述第二分束镜后，形成两束啁啾展宽脉冲，其中一束啁啾展宽脉冲进入所述第二散色介质，然后通过所述第二反射模块反射回所述第二分束镜，另一束啁啾展宽脉冲通过所述反射镜反射回所述第二分束镜，返回所述第二分束镜的两束啁啾展宽脉冲重叠进行拍频，生成频率啁啾可调的激光脉冲串。After the chirped stretched pulse passes through the second beam splitter, two chirped stretched pulses are formed, one of which enters the second dispersive medium, and is then reflected back through the second reflection module. In the second beam splitter, another beam of chirped stretched pulses is reflected back to the second beam splitter by the reflector, and the two chirped stretched pulses returned to the second beam splitter are overlapped for beat frequency, Generates laser pulse trains with tunable frequency chirp.
优选地，所述第一分束镜为透射/反射镜。Preferably, the first beam splitter is a transmission/reflection mirror.
优选地，所述第一色散介质为第一光栅对。Preferably, the first dispersive medium is a first grating pair.
优选地，所述第二色散介质为第二光栅对。Preferably, the second dispersive medium is a second grating pair.
优选地，所述透射/反射镜朝向激光源的一面为全透射，另一面为全反射。Preferably, one side of the transmission/reflection mirror facing the laser source is totally transparent, and the other side is totally reflective.
优选地，所述第一光栅对的光栅常数为1200mm-1，激光入射角度为57°，光栅对间距为6cm。Preferably, the grating constant of the first grating pair is 1200 mm −1 , the incident angle of the laser light is 57°, and the distance between the grating pairs is 6 cm.
优选地，所述第二光栅对的光栅常数为300mm-1，激光入射角度为21°，光栅对间距可调节。Preferably, the grating constant of the second grating pair is 300 mm −1 , the incident angle of the laser light is 21°, and the spacing between the grating pairs is adjustable.
优选地，所述第二分束镜为T:R＝50％:50％的半透半反镜。Preferably, the second beam splitter is a half mirror with T:R=50%:50%.
优选地，所述超短飞秒脉冲为傅里叶变换极限的高斯激光脉冲。Preferably, the ultrashort femtosecond pulse is a Gaussian laser pulse of the Fourier transform limit.
优选地，所述傅里叶变换极限的高斯激光脉冲的长度为40fs。Preferably, the length of the Gaussian laser pulse at the Fourier transform limit is 40 fs.
综上所述，本发明公开了一种产生频率啁啾可调的激光脉冲串的装置，包括：初始激光展宽单元、啁啾控制单元和激光拍频单元；其中：初始激光展宽单元包括：激光器和展宽器，其中，展宽器包括：第一分束镜、第一色散介质和第一反射模块；啁啾控制单元包括：第二色散介质和第二反射模块；激光拍频单元包括：第二分束镜和反射镜；其中：激光器产生的超短飞秒脉冲通过第一分束镜后进入第一色散介质，然后通过第一反射模块形成啁啾展宽脉冲；啁啾展宽脉冲通过第二分束镜后，形成两束啁啾展宽脉冲，其中一束啁啾展宽脉冲进入所述第二散色介质，然后通过第二反射模块反射回第二分束镜，另一束啁啾展宽脉冲通过反射镜反射回第二分束镜，返回第二分束镜的两束啁啾展宽脉冲重叠进行拍频，生成频率啁啾可调的激光脉冲串。本发明能够有效的产生中心频率和啁啾大范围可调谐的太赫兹辐射源。To sum up, the present invention discloses a device for generating a laser pulse train with adjustable frequency chirp, comprising: an initial laser stretching unit, a chirp control unit and a laser beat frequency unit; wherein: the initial laser stretching unit includes: a laser and a stretcher, wherein the stretcher includes: a first beam splitter, a first dispersion medium and a first reflection module; the chirp control unit includes: a second dispersion medium and a second reflection module; the laser beat frequency unit includes: a second Beam splitter and mirror; wherein: the ultra-short femtosecond pulse generated by the laser enters the first dispersion medium after passing through the first beam splitter, and then forms a chirped stretched pulse through the first reflection module; the chirped stretched pulse passes through the second splitter After the beam mirror, two beams of chirped broadened pulses are formed, one beam of chirped broadened pulses enters the second dispersive medium, and then reflected back to the second beam splitter by the second reflection module, and the other beam of chirped broadened pulses passes through The mirror reflects back to the second beam splitter, and the two chirped broadened pulses returned to the second beam splitter are overlapped for beat frequency to generate a laser pulse train with adjustable frequency chirp. The invention can effectively generate a terahertz radiation source with a wide range of tunable center frequency and chirp.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.
图1为本发明公开的一种产生频率啁啾可调的激光脉冲串的装置的结构示意图；1 is a schematic structural diagram of a device for generating a laser pulse train with adjustable frequency chirp disclosed in the present invention;
图2(a)为本发明公开的一种不同时间间隔下的归一化激光强度和强度调制频率分布示意图；Figure 2(a) is a schematic diagram of the distribution of normalized laser intensity and intensity modulation frequency at different time intervals disclosed in the present invention;
图2(b)为本发明公开的另一种不同时间间隔下的归一化激光强度和强度调制频率分布示意图；Fig. 2(b) is another schematic diagram of normalized laser intensity and intensity modulation frequency distribution under different time intervals disclosed in the present invention;
图2(c)为本发明公开的另一种不同时间间隔下的归一化激光强度和强度调制频率分布示意图；Fig. 2(c) is another schematic diagram of normalized laser intensity and intensity modulation frequency distribution under different time intervals disclosed in the present invention;
图3(a)为本发明公开的一种不同光栅对间隔下的归一化激光强度和强度调制频率分布示意图；3(a) is a schematic diagram of the normalized laser intensity and intensity modulation frequency distribution under different grating pair spacings disclosed in the present invention;
图3(b)为本发明公开的另一种不同光栅对间隔下的归一化激光强度和强度调制频率分布示意图；Figure 3(b) is another schematic diagram of normalized laser intensity and intensity modulation frequency distribution under different grating pair spacings disclosed in the present invention;
图3(c)为本发明公开的另一种不同光栅对间隔下的归一化激光强度和强度调制频率分布示意图。Fig. 3(c) is another schematic diagram of normalized laser intensity and intensity modulation frequency distribution under different grating pair spacings disclosed in the present invention.
具体实施方式Detailed ways
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
如图1所示，为本发明公开的一种产生频率啁啾可调的激光脉冲串的装置，包括：初始激光展宽单元100、啁啾控制单元200和激光拍频单元300；其中：初始激光展宽单元100包括：激光器110和展宽器120，其中，展宽器120包括：第一分束镜121、第一色散介质122和第一反射模块123；啁啾控制单元200包括：第二色散介质220和第二反射模块210；激光拍频单元300包括：第二分束镜310和反射镜320；其中：As shown in FIG. 1, it is a device for generating a laser pulse train with adjustable frequency chirp disclosed in the present invention, comprising: an initial
激光器110产生的超短飞秒脉冲通过第一分束镜121后进入第一色散介质122，然后通过第一反射模块123形成啁啾展宽脉冲；The ultra-short femtosecond pulse generated by the
啁啾展宽脉冲通过第二分束镜310后，形成两束啁啾展宽脉冲，其中一束啁啾展宽脉冲进入第二散色介质220，然后通过第二反射模块210反射回第二分束镜310，另一束啁啾展宽脉冲通过反射镜320反射回第二分束镜310，返回第二分束镜310的两束啁啾展宽脉冲重叠进行拍频，生成频率啁啾可调的激光脉冲串。After the chirped stretched pulse passes through the second beam splitter 310 , two chirped stretched pulses are formed, one of which enters the second
上述实施例公开的产生频率啁啾可调的激光脉冲串的装置的工作原理为：当需要产生中心频率和啁啾大范围可调谐的太赫兹辐射源时，首先通过初始激光展宽单元100中的激光器110产生的超短飞秒脉冲，激光器110产生的超短飞秒脉冲通过展宽器120中的第一分束镜121后进入第一色散介质122，然后通过第一反射模块123形成啁啾展宽脉冲，第一分束镜121将第一反射模块123发射回的啁啾展宽脉冲发送至第二分束镜310，第二分束镜310对啁啾展宽脉冲进行分束，形成两束啁啾展宽脉冲，其中一束啁啾展宽脉冲进入第二散色介质220，然后通过第二反射模块210反射回第二分束镜310，另一束啁啾展宽脉冲通过反射镜320反射回第二分束镜310，返回第二分束镜310的两束啁啾展宽脉冲重叠进行拍频，生成频率啁啾可调的激光脉冲串。The working principle of the device for generating a laser pulse train with tunable frequency chirp disclosed in the above embodiments is as follows: when it is necessary to generate a terahertz radiation source with a wide range of tunable center frequency and chirp, first pass through the initial
具体的，在上述实施例中，激光器射出一束傅里叶变换极限的高斯激光脉冲，其电场可表示为：Specifically, in the above embodiment, the laser emits a Gaussian laser pulse with a Fourier transform limit, and its electric field can be expressed as:
其中，σ0为激光脉冲宽度，ω0为中心角频率。当激光脉冲进入展宽器后，其将会受到依赖于频率的相位调制，进行泰勒展开可得到：Among them, σ 0 is the laser pulse width, and ω 0 is the center angular frequency. When the laser pulse enters the stretcher, it will be subjected to frequency-dependent phase modulation, which can be obtained by Taylor expansion:
忽略高阶项，经过展宽器后的脉冲将形成线性的频率啁啾，并且脉冲宽度将会展宽为σ1，可表示为：Ignoring higher-order terms, the pulse after the stretcher will form a linear frequency chirp, and the pulse width will be stretched to σ 1 , which can be expressed as:
其中，
当
由此，可以看出，通过控制反射镜所形成的时间延迟τ可实现中心频率的连续调节；同时，通过控制啁啾控制单元中光栅对的间隔D来实现
具体的，在上述实施例中，第一分束镜可以为透射/反射镜。Specifically, in the above embodiment, the first beam splitter may be a transmission/reflection mirror.
具体的，在上述实施例中，第一色散介质可以为由两个平行光栅构成的第一光栅对。Specifically, in the foregoing embodiment, the first dispersive medium may be a first grating pair formed by two parallel gratings.
具体的，在上述实施例中，第一光栅对的光栅常数可以为1200mm-1，激光入射角度可以为57°，光栅对间距可以为6cm。Specifically, in the above embodiment, the grating constant of the first grating pair may be 1200 mm −1 , the incident angle of the laser light may be 57°, and the distance between the grating pairs may be 6 cm.
具体的，在上述实施例中，第二色散介质可以为由两个平行光栅构成的第二光栅对。Specifically, in the above embodiment, the second dispersive medium may be a second grating pair formed by two parallel gratings.
具体的，在上述实施例中，第二光栅对的光栅常数可以为300mm-1，激光入射角度可以为21°，光栅对间距可调节。Specifically, in the above embodiment, the grating constant of the second grating pair may be 300 mm −1 , the incident angle of the laser light may be 21°, and the pitch of the grating pair can be adjusted.
具体的，在上述实施例中，透射/反射镜朝向激光源的一面为全透射，另一面为全反射。Specifically, in the above-mentioned embodiment, one side of the transmission/reflection mirror facing the laser source is totally transmissive, and the other side is totally reflective.
具体的，在上述实施例中，第二分束镜可以为T:R＝50％:50％的半透半反镜。Specifically, in the above embodiment, the second beam splitter may be a half mirror with T:R=50%:50%.
具体的，在上述实施例中，超短飞秒脉冲为傅里叶变换极限的高斯激光脉冲。Specifically, in the above embodiment, the ultra-short femtosecond pulse is a Gaussian laser pulse of the Fourier transform limit.
具体的，在上述实施例中，傅里叶变换极限的高斯激光脉冲的长度为40fs。Specifically, in the above embodiment, the length of the Gaussian laser pulse in the Fourier transform limit is 40 fs.
为进一步对本发明的技术方案产生的技术效果进行说明，下面以具体的试验结果进行详细说明：In order to further illustrate the technical effect produced by the technical solution of the present invention, the following is described in detail with specific test results:
图2(a)为啁啾控制单元中第二光栅对间隔D＝44mm时，通过反射镜得到的时间间隔τ为1ps时，激光强度和强度调制频率在时间上的分布；其中：激光器产生的初始激光脉冲长度为40fs；第一光栅对的光栅常数为1200mm-1，激光入射角度为57°，光栅对间距为6cm；第二光栅对的光栅常数为300mm-1，激光入射角度为21°。Figure 2(a) shows the time distribution of laser intensity and intensity modulation frequency when the interval between the second grating pair in the chirp control unit is D=44mm and the time interval τ obtained by the mirror is 1ps; The initial laser pulse length is 40fs; the grating constant of the first grating pair is 1200mm -1 , the laser incident angle is 57°, and the grating pair spacing is 6cm; the grating constant of the second grating pair is 300mm -1 , and the laser incident angle is 21° .
图2(b)为啁啾控制单元中第二光栅对间隔D＝44mm时，通过反射镜得到的时间间隔τ为2ps时，激光强度和强度调制频率在时间上的分布；其中：激光器产生的初始激光脉冲长度为40fs；第一光栅对的光栅常数为1200mm-1，激光入射角度为57°，光栅对间距为6cm；第二光栅对的光栅常数为300mm-1，激光入射角度为21°。Figure 2(b) shows the time distribution of the laser intensity and the intensity modulation frequency when the interval between the second grating pair in the chirped control unit is D=44mm and the time interval τ obtained by the mirror is 2ps; The initial laser pulse length is 40fs; the grating constant of the first grating pair is 1200mm -1 , the laser incident angle is 57°, and the grating pair spacing is 6cm; the grating constant of the second grating pair is 300mm -1 , and the laser incident angle is 21° .
图2(c)为啁啾控制单元中第二光栅对间隔D＝44mm时，通过反射镜得到的时间间隔τ为3ps时，激光强度和强度调制频率在时间上的分布；其中：激光器产生的初始激光脉冲长度为40fs；第一光栅对的光栅常数为1200mm-1，激光入射角度为57°，光栅对间距为6cm；第二光栅对的光栅常数为300mm-1，激光入射角度为21°。Figure 2(c) shows the time distribution of the laser intensity and the intensity modulation frequency when the interval between the second grating pair in the chirp control unit is D=44mm and the time interval τ obtained by the mirror is 3ps; The initial laser pulse length is 40fs; the grating constant of the first grating pair is 1200mm -1 , the laser incident angle is 57°, and the grating pair spacing is 6cm; the grating constant of the second grating pair is 300mm -1 , and the laser incident angle is 21° .
图3(a)为两束啁啾展宽脉冲时间间隔τ＝3ps时，第二光栅对间隔D＝0mm时，激光强度和激光强度调制频率在时间上的分布，其中，中心频率均：3.0THz，覆盖频率范围为：无啁啾，激光器产生的初始激光脉冲长度为40fs；第一光栅对的光栅常数为1200mm-1，激光入射角度为57°，光栅对间距为6cm；第二光栅对的光栅常数为300mm-1，激光入射角度为21°。Figure 3(a) shows the time distribution of laser intensity and laser intensity modulation frequency when the time interval of two chirped broadening pulses is τ=3ps and the interval between the second grating pair is D=0mm, wherein the center frequency is both: 3.0THz , the coverage frequency range is: no chirp, the initial laser pulse length generated by the laser is 40fs; the grating constant of the first grating pair is 1200mm -1 , the laser incident angle is 57°, and the grating pair spacing is 6cm; The grating constant was 300 mm -1 and the laser incident angle was 21°.
图3(b)为两束啁啾展宽脉冲时间间隔τ＝3ps时，第二光栅对间隔D＝44mm时，激光强度和激光强度调制频率在时间上的分布，其中，中心频率均：3.0THz，覆盖频率范围为：2.2-3.6THz，激光器产生的初始激光脉冲长度为40fs；第一光栅对的光栅常数为1200mm-1，激光入射角度为57°，光栅对间距为6cm；第二光栅对的光栅常数为300mm-1，激光入射角度为21°。Figure 3(b) shows the time distribution of the laser intensity and the laser intensity modulation frequency when the time interval of the two chirped broadening pulses is τ=3ps and the interval between the second grating pair is D=44mm, wherein the center frequency is both: 3.0THz , the coverage frequency range is: 2.2-3.6THz, the initial laser pulse length generated by the laser is 40fs; the grating constant of the first grating pair is 1200mm -1 , the laser incident angle is 57°, and the grating pair spacing is 6cm; the second grating pair The grating constant is 300mm -1 and the laser incident angle is 21°.
图3(c)为两束啁啾展宽脉冲时间间隔τ＝3ps时，第二光栅对间隔D＝96mm时，激光强度和激光强度调制频率在时间上的分布，其中，中心频率均：3.0THz，覆盖频率范围为：1.2-4.5THz，激光器产生的初始激光脉冲长度为40fs；第一光栅对的光栅常数为1200mm-1，激光入射角度为57°，光栅对间距为6cm；第二光栅对的光栅常数为300mm-1，激光入射角度为21°。Figure 3(c) shows the time distribution of laser intensity and laser intensity modulation frequency when the time interval of two chirped broadening pulses is τ=3ps and the interval of the second grating pair is D=96mm, in which the center frequency is both: 3.0THz , covering the frequency range: 1.2-4.5THz, the initial laser pulse length generated by the laser is 40fs; the grating constant of the first grating pair is 1200mm -1 , the laser incident angle is 57°, and the grating pair spacing is 6cm; the second grating pair The grating constant is 300mm -1 and the laser incident angle is 21°.
通过本发明形成的激光脉冲串可直接激发辐射介质(如：光导天线)产生相应的太赫兹辐射源；也可利用该激光脉冲串对各类加速器装置中所产生的电子束进行调制，通过同步辐射等机理得到相应的高功率太赫兹辐射源；另外，还可应用于基于激光等离子体原理的太赫兹辐射源中。The laser pulse train formed by the present invention can directly excite a radiation medium (such as a photoconductive antenna) to generate a corresponding terahertz radiation source; the laser pulse train can also be used to modulate the electron beams generated in various accelerator devices, through synchronization A corresponding high-power terahertz radiation source can be obtained through mechanisms such as radiation; in addition, it can also be applied to a terahertz radiation source based on the principle of laser plasma.
综上所述，本发明实现了频率啁啾可调的激光脉冲串的产生，且中心频率和啁啾量大范围连续可调节，光路简单，且不影响激光脉冲的传输，产生的激光脉冲串应用范围广，可用于光学、加速器等领域太赫兹辐射源的产生。To sum up, the present invention realizes the generation of a laser pulse train with adjustable frequency chirp, and the center frequency and the chirp amount can be continuously adjusted in a large range, the optical path is simple, and the transmission of the laser pulse is not affected. It has a wide range of applications and can be used for the generation of terahertz radiation sources in the fields of optics and accelerators.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。对于实施例公开的装置而言，由于其与实施例公开的方法相对应，所以描述的比较简单，相关之处参见方法部分说明即可。The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.
专业人员还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the possibilities of hardware and software. Interchangeability, the above description has generally described the components and steps of each example in terms of functionality. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.
结合本文中所公开的实施例描述的方法或算法的步骤可以直接用硬件、处理器执行的软件模块，或者二者的结合来实施。软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。The steps of a method or algorithm described in conjunction with the embodiments disclosed herein may be directly implemented in hardware, a software module executed by a processor, or a combination of the two. A software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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