CN203824653U - Femtosecond laser pulse width measuring instrument based on molecular ionization detection - Google Patents
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Abstract
本实用新型公开了一种基于分子电离探测的飞秒激光脉冲宽度测量仪,包括飞秒激光脉冲光束发射源,与飞秒激光脉冲光束发射源相对的同一水平面上设有分束片,飞秒激光脉冲光束经过分束片后形成两道光束通道,通过第一道光束通道中平面高反射镜C的飞秒激光脉冲光束和通过第二道光束通道中平面高反射镜F的飞秒激光脉冲光束经过合束片后在聚焦透镜的作用下与飞行时间质谱仪的超声分子束精确重合。本实用新型简单实用、调节方便、数据采集与数据处理迅速,可以适应不同脉冲宽度和不同波长的飞秒激光脉冲宽度与脉冲形状的测量和实时监测。
The utility model discloses a femtosecond laser pulse width measuring instrument based on molecular ionization detection. The laser pulse beam passes through the beam splitter to form two beam channels, the femtosecond laser pulse beam passing through the plane high reflection mirror C in the first beam channel and the femtosecond laser pulse passing through the plane high reflection mirror F in the second beam channel After the beam passes through the beam combiner, under the action of the focusing lens, it precisely coincides with the ultrasonic molecular beam of the time-of-flight mass spectrometer. The utility model is simple and practical, convenient to adjust, fast in data collection and data processing, and can adapt to the measurement and real-time monitoring of femtosecond laser pulse width and pulse shape with different pulse widths and different wavelengths.
Description
技术领域 technical field
本实用新型涉及一种飞秒激光脉冲光学参量的测量装置,具体涉及一种基于分子电离探测的飞秒激光脉冲宽度测量仪。 The utility model relates to a measuring device for femtosecond laser pulse optical parameters, in particular to a femtosecond laser pulse width measuring instrument based on molecular ionization detection.
背景技术 Background technique
飞秒激光及相应飞秒激光技术的研究随着飞秒激光脉冲在科研、生物、医疗、加工、通信、国防等社会各个领域的应用的拓展与深入而迅速发展。其中一个重要方面的应用是利用飞秒激光脉冲和飞秒激光光谱学方法来研究蛋白质、纳米材料、半导体等各类材料中的超快动力学特性。比如,可采用飞秒泵浦-探测技术和飞秒受激拉曼散射技术等研究蛋白质结构动力学,半导体和纳米材料载流子动力学。另一方面,飞秒激光的脉冲形状和脉冲宽度是飞秒激光脉冲应用中一个重要的光学参量,对它的测量或实时监测在很多实验和应用中十分必要。目前,脉冲测量的两个重要方法是频率分辨光开关(Frequency-resolved optical grating简称FROG)方法和自参考光谱干涉(self-referenced spectral interferometry 简称SRSI)方法,然而上述两种测量方法都是基于光电探测器的脉冲测量方法,而光电探测器都有一定的频率响应范围,因此利用传统的光学探测器测量飞秒激光脉冲光学参量的方法对于待测激光的频率受到了限制。 The research on femtosecond laser and corresponding femtosecond laser technology has developed rapidly with the expansion and deepening of the application of femtosecond laser pulses in scientific research, biology, medical treatment, processing, communication, national defense and other social fields. One of the important applications is the use of femtosecond laser pulses and femtosecond laser spectroscopy to study ultrafast dynamics in various materials such as proteins, nanomaterials, and semiconductors. For example, femtosecond pump-probe technology and femtosecond stimulated Raman scattering technology can be used to study protein structural dynamics, semiconductor and nanomaterial carrier dynamics. On the other hand, the pulse shape and pulse width of femtosecond laser is an important optical parameter in the application of femtosecond laser pulse, and its measurement or real-time monitoring is very necessary in many experiments and applications. At present, two important methods of pulse measurement are frequency-resolved optical grating (FROG) method and self-referenced spectral interferometry (SRSI) method, but the above two measurement methods are based on optoelectronic The pulse measurement method of the detector, and the photodetector has a certain frequency response range, so the method of using the traditional optical detector to measure the optical parameters of the femtosecond laser pulse is limited to the frequency of the laser to be measured.
发明内容 Contents of the invention
本实用新型解决的技术问题是提供了一种简单实用、调节方便、数据采集与数据处理迅速的基于分子电离探测的飞秒激光脉冲宽度测量仪,该装置可以利用光的干涉效应和激光电离分子来测量复杂的飞秒激光脉冲光学参量。 The technical problem solved by the utility model is to provide a femtosecond laser pulse width measuring instrument based on molecular ionization detection, which is simple and practical, convenient to adjust, and fast in data acquisition and data processing. The device can use the interference effect of light and laser ionized molecules To measure complex optical parameters of femtosecond laser pulses.
本实用新型的技术方案为:一种基于分子电离探测的飞秒激光脉冲宽度测量仪,包括飞秒激光脉冲光束发射源,其特征在于:与飞秒激光脉冲光束发射源相对的同一水平面上设有分束片,飞秒激光脉冲光束经过分束片后形成两道光束通道,其中第一道光束通道沿光束前进方向依次设有平面高反射镜A、平面高反射镜B和平面高反射镜C,第二道光束通道沿光束前进方向依次设有平面高反射镜D、平面高反射镜E和平面高反射镜F,所述的平面高反射镜B和平面高反射镜C设置于高精度电动平移台上形成高精度光学延迟平台,通过第一道光束通道中平面高反射镜C的飞秒激光脉冲光束和通过第二道光束通道中平面高反射镜F的飞秒激光脉冲光束经过合束片后在聚焦透镜的作用下与飞行时间质谱仪的超声分子束精确重合,所述的聚焦透镜设置于合束片的后方,飞行时间质谱仪设置于聚焦透镜的后方,所述的飞行时间质谱仪包括超声分子束系统、束源腔、电离腔、离子透镜和微通道板探测器,其中超声分子束系统主要由载气装置、进气管道和样品池构成,载气装置与样品池通过进气管道相连接,束源腔通过进气管道与样品池相连通,该进气管道的末端设有脉冲阀,束源腔的下方连接有分子泵A,分子泵A与机械泵A连接,所述的电离腔设置于束源腔的一侧,电离腔的下方连接有分子泵B,分子泵B与机械泵B连接,在电离腔内设有离子透镜,该离子透镜包括沿超声分子束前进方向依次平行设置的极板A、极板B和极板C,所述的微通道板探测器设置于与离子透镜相对的方向上。 The technical scheme of the utility model is: a femtosecond laser pulse width measuring instrument based on molecular ionization detection, including a femtosecond laser pulse beam emitting source, characterized in that: There is a beam splitter, and the femtosecond laser pulse beam passes through the beam splitter to form two beam channels, of which the first beam channel is provided with a plane high reflection mirror A, a plane high reflection mirror B and a plane high reflection mirror in sequence along the beam advancing direction C, the second beam channel is sequentially provided with a plane high reflection mirror D, a plane high reflection mirror E and a plane high reflection mirror F along the beam advancing direction, and the plane high reflection mirror B and the plane high reflection mirror C are set at high precision A high-precision optical delay platform is formed on the electric translation stage, and the femtosecond laser pulse beam passing through the plane high reflection mirror C in the first beam channel and the femtosecond laser pulse beam passing through the plane high reflection mirror F in the second beam channel are combined After the beam sheet is precisely overlapped with the ultrasonic molecular beam of the time-of-flight mass spectrometer under the action of the focusing lens, the focusing lens is arranged behind the beam combining sheet, the time-of-flight mass spectrometer is arranged behind the focusing lens, and the time-of-flight The mass spectrometer includes an ultrasonic molecular beam system, a beam source chamber, an ionization chamber, an ion lens, and a microchannel plate detector. The ultrasonic molecular beam system is mainly composed of a carrier gas device, an intake pipe, and a sample cell. The intake pipe is connected, and the beam source chamber is connected with the sample cell through the intake pipe. The end of the intake pipe is provided with a pulse valve, and the molecular pump A is connected under the beam source chamber, and the molecular pump A is connected with the mechanical pump A. The ionization cavity is arranged on one side of the beam source cavity, and a molecular pump B is connected to the bottom of the ionization cavity, and the molecular pump B is connected to the mechanical pump B. An ion lens is arranged in the ionization cavity, and the ion lens includes Pole plate A, pole plate B, and pole plate C are arranged in parallel in sequence in the advancing direction, and the microchannel plate detector is set in a direction opposite to the ion lens.
本实用新型利用Labview实现对高精度电动平移台和微通道板探测器输入采集卡的信号进行自动化控制。 The utility model utilizes Labview to realize the automatic control of the signal inputted by the high-precision electric translation platform and the micro-channel plate detector into the acquisition card.
本实用新型具有以下有益效果:1、利用光的干涉效应来测量复杂的飞秒激光脉冲宽度;2、本实用新型结构简单,仅仅利用几个平面高反射镜就可以进行脉冲测量和进行泵浦探测实验,减少了光学元件带来的稳定性影响,提高了系统的可靠性和稳定性;3、与先前的装置相比,本实用新型的装置主要通过飞秒激光电离分子来检测,因此显著地提高了飞秒激光脉冲测量的频率范围,可以实现对深紫外到中红外超宽带光谱范围的周期量级到几百飞秒的激光脉冲的测量。 The utility model has the following beneficial effects: 1. Use the interference effect of light to measure the complex femtosecond laser pulse width; 2. The utility model has a simple structure, and only a few plane high reflection mirrors can be used for pulse measurement and pumping The detection experiment reduces the stability impact brought by the optical elements and improves the reliability and stability of the system; 3. Compared with the previous device, the device of the present invention mainly detects molecules by femtosecond laser ionization, so it is significantly The frequency range of femtosecond laser pulse measurement has been greatly improved, and the measurement of laser pulses from the period level to hundreds of femtoseconds in the deep ultraviolet to mid-infrared ultra-broadband spectral range can be realized.
附图说明 Description of drawings
图1是本实用新型的光路结构示意图,图2是本实用新型800 nm中心波长约50 fs激光脉冲的实验结果图。 Fig. 1 is the optical path structure schematic diagram of the present utility model, and Fig. 2 is the experimental result figure of the approximately 50 fs laser pulse of 800 nm central wavelength of the present utility model.
图面说明:1、飞秒激光脉冲光束发射源,2、分束片,3、平面高反射镜A,4、平面高反射镜B,5、平面高反射镜C,6、高精度电动平移台,7、平面高反射镜D,8、平面高反射镜E,9、平面高反射镜F,10、合束片,11、聚焦透镜,12、飞行时间质谱仪,13、超声分子束系统,14、束源腔,15、电离腔,16、离子透镜,17、微通道板探测器,18、载气装置,19、样品池,20、进气管道,21、脉冲阀,22、分子泵A,23、分子泵B,24、机械泵A,25、机械泵B,26、极板A,27、极板B,28、极板C。 Drawing description: 1. Femtosecond laser pulse beam emission source, 2. Beam splitter, 3. Plane high reflection mirror A, 4. Plane high reflection mirror B, 5. Plane high reflection mirror C, 6. High-precision electric translation Platform, 7. Plane highly reflective mirror D, 8. Plane highly reflective mirror E, 9. Plane highly reflective mirror F, 10. Beam combiner, 11. Focusing lens, 12. Time-of-flight mass spectrometer, 13. Ultrasonic molecular beam system , 14. Beam source chamber, 15. Ionization chamber, 16. Ion lens, 17. Microchannel plate detector, 18. Carrier gas device, 19. Sample cell, 20. Intake pipe, 21. Pulse valve, 22. Molecule Pump A, 23, Molecular pump B, 24, Mechanical pump A, 25, Mechanical pump B, 26, Pole plate A, 27, Pole plate B, 28, Pole plate C.
具体实施方式 Detailed ways
结合附图详细描述实施例。一种基于分子电离探测的飞秒激光脉冲宽度测量仪,包括飞秒激光脉冲光束发射源1,与飞秒激光脉冲光束发射源1相对的同一水平面上设有分束片2,飞秒激光脉冲光束经过分束片2后形成两道光束通道,其中第一道光束通道沿光束前进方向依次设有平面高反射镜A 3、平面高反射镜B 4和平面高反射镜C 5,第二道光束通道沿光束前进方向依次设有平面高反射镜D 7、平面高反射镜E 8和平面高反射镜F 9,所述的平面高反射镜B 4和平面高反射镜C 5设置于高精度电动平移台6上形成高精度光学延迟平台,平面高反射镜B 4和平面高反射镜C 5在高精度电动平移台6的带动下沿光束方向前后进行高精度运行,通过第一道光束通道中平面高反射镜C 5的飞秒激光脉冲光束和通过第二道光束通道中平面高反射镜F 9的飞秒激光脉冲光束经过合束片10后在聚焦透镜11的作用下与飞行时间质谱仪12的超声分子束精确重合,所述的聚焦透镜11设置于合束片10的后方,飞行时间质谱仪12设置于聚焦透镜11的后方,所述的飞行时间质谱仪12包括超声分子束系统13、束源腔14、电离腔15、离子透镜16和微通道板探测器17,其中超声分子束系统13主要由载气装置18、进气管道20和样品池19构成,载气装置18与样品池19通过进气管道20相连接,束源腔14通过进气管道20与样品池19相连通,该进气管道20的末端设有脉冲阀21,束源腔14的下方连接有分子泵A 22,分子泵A 22与机械泵A 24连接,所述的电离腔15设置于束源腔14的一侧,电离腔15的下方连接有分子泵B 23,分子泵B 23与机械泵B 25连接,在电离腔15内设有离子透镜16,该离子透镜16包括沿超声分子束前进方向依次平行设置的极板A 26、极板B 27和极板C 28,所述的微通道板探测器17设置于与离子透镜16相对的方向上,分子被电离形成的离子在电场的作用下飞向微通道板探测17,最后通过耦合电路与计算机上的采集卡连接。本实用新型利用Labview实现对高精度电动平移台6和微通道板探测器17输入采集卡的信号进行自动化控制。 Embodiments are described in detail with reference to the accompanying drawings. A femtosecond laser pulse width measuring instrument based on molecular ionization detection, comprising a femtosecond laser pulse beam emitting source 1, a beam splitter 2 is arranged on the same horizontal plane opposite to the femtosecond laser pulse beam emitting source 1, and the femtosecond laser pulse beam After the beam passes through the beam splitter 2, two beam channels are formed, wherein the first beam channel is sequentially provided with a plane high reflection mirror A 3, a plane high reflection mirror B 4 and a plane high reflection mirror C 5 along the beam advancing direction, and the second one The beam channel is provided with a plane high reflection mirror D 7, a plane high reflection mirror E 8 and a plane high reflection mirror F 9 successively along the light beam advancing direction, and the plane high reflection mirror B 4 and the plane high reflection mirror C 5 are arranged at high precision A high-precision optical delay platform is formed on the electric translation platform 6, and the plane high-reflection mirror B 4 and the plane high-reflection mirror C 5 are driven by the high-precision electric translation platform 6 to move forward and backward with high precision along the beam direction, and pass through the first beam channel The femtosecond laser pulse beam of the mid-plane high reflection mirror C 5 and the femtosecond laser pulse beam of the mid-plane high reflection mirror F 9 passing through the second beam channel pass through the beam combiner 10 and combine with the time-of-flight mass spectrometer under the action of the focusing lens 11 The ultrasonic molecular beams of the instrument 12 are precisely overlapped, the focusing lens 11 is arranged behind the beam combining plate 10, and the time-of-flight mass spectrometer 12 is arranged behind the focusing lens 11, and the described time-of-flight mass spectrometer 12 includes an ultrasonic molecular beam system 13. A beam source chamber 14, an ionization chamber 15, an ion lens 16 and a microchannel plate detector 17, wherein the ultrasonic molecular beam system 13 is mainly composed of a carrier gas device 18, an air inlet pipe 20 and a sample cell 19, and the carrier gas device 18 and The sample pool 19 is connected to each other through the intake pipe 20, the beam source chamber 14 is connected to the sample pool 19 through the intake pipe 20, the end of the intake pipe 20 is provided with a pulse valve 21, and the beam source chamber 14 is connected with a molecular pump below A 22, the molecular pump A 22 is connected with the mechanical pump A 24, the ionization chamber 15 is arranged on one side of the beam source chamber 14, the molecular pump B 23 is connected under the ionization chamber 15, the molecular pump B 23 and the mechanical pump B 25 is connected, and ion lens 16 is provided in ionization cavity 15, and this ion lens 16 comprises pole plate A 26, pole plate B 27 and pole plate C 28 that are arranged in parallel along the advancing direction of ultrasonic molecular beams successively, and described microchannel plate The detector 17 is arranged in the direction opposite to the ion lens 16, and the ions formed by the ionization of molecules fly to the microchannel plate detector 17 under the action of the electric field, and finally connect with the acquisition card on the computer through a coupling circuit. The utility model utilizes Labview to realize the automatic control of the signal inputted by the high-precision electric translation platform 6 and the microchannel plate detector 17 into the acquisition card.
用本测量装置测量800 nm中心波长约50 fs激光脉冲,其测量结果如图2所示,由此可以通过本装置实现对深紫外到近红外超宽带光谱范围的周期量级到几百飞秒的激光脉冲的测量。 Using this measuring device to measure laser pulses with a center wavelength of 800 nm of about 50 fs, the measurement results are shown in Figure 2. Therefore, this device can be used to measure the period level of the ultra-broadband spectral range from deep ultraviolet to near infrared to hundreds of femtoseconds measurement of laser pulses.
以上显示和描述了本实用新型的基本原理,主要特征和优点,在不脱离本实用新型精神和范围的前提下,本实用新型还有各种变化和改进,这些变化和改进都落入要求保护的本实用新型的范围。 The basic principles, main features and advantages of the present utility model have been shown and described above. On the premise of not departing from the spirit and scope of the present utility model, the present utility model also has various changes and improvements, and these changes and improvements all fall into the claims. The scope of the utility model.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103868604A (en) * | 2014-03-21 | 2014-06-18 | 河南师范大学 | Femtosecond laser pulse width measuring device based on molecule ionization detection |
CN104538276A (en) * | 2014-12-26 | 2015-04-22 | 宁波大学 | Ion source soft ionization device and method under barometric pressure |
CN113117606A (en) * | 2021-05-28 | 2021-07-16 | 中国科学技术大学 | Beam source control device for precisely adjusting direction and position of beam source in vacuum beam source cavity |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN103868604A (en) * | 2014-03-21 | 2014-06-18 | 河南师范大学 | Femtosecond laser pulse width measuring device based on molecule ionization detection |
CN104538276A (en) * | 2014-12-26 | 2015-04-22 | 宁波大学 | Ion source soft ionization device and method under barometric pressure |
CN113117606A (en) * | 2021-05-28 | 2021-07-16 | 中国科学技术大学 | Beam source control device for precisely adjusting direction and position of beam source in vacuum beam source cavity |
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