CN201622746U - Gaussian beam transformation rule and characteristic measurement teaching experimental instrument - Google Patents

Gaussian beam transformation rule and characteristic measurement teaching experimental instrument Download PDF

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CN201622746U
CN201622746U CN201020026726XU CN201020026726U CN201622746U CN 201622746 U CN201622746 U CN 201622746U CN 201020026726X U CN201020026726X U CN 201020026726XU CN 201020026726 U CN201020026726 U CN 201020026726U CN 201622746 U CN201622746 U CN 201622746U
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laser
gaussian beam
power meter
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laser power
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CN201020026726XU
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杨晓冬
陈美华
刘展武
刘定文
刘进宝
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嘉应学院
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Abstract

The utility model relates to a Gaussian beam transformation rule and characteristic measurement teaching experimental instrument. The experimental instrument is characterized in that one end of a track is provided with a laser while the other end is provided with a laser power meter, a convex lens is disposed between the laser and the laser power meter, and a knife edge is arranged between the convex lens and the laser power meter. The experimental instrument is in full open type, can directly observe basic structures, is clear and direct-viewing in measuring principle and manual in measuring process, and can assist students to understand and master concepts of Gaussian beam spot radius, far-field divergence angles, diffraction multiplying power factors and relevant measuring methods and improve experimental skills. The Gaussian beam transformation rule and characteristic measurement teaching experimental instrument has the advantages that the experiment instrument is low in cost, durable in use, not easy to be damaged and simple in structure.

Description

高斯光束变换规律及特性测量教学实验仪 Gaussian beam transformation rules and characteristics of the measuring instrument teaching experiment

技术领域 FIELD

[0001] 本实用新型涉及一种教学实验仪器,特别是一种高斯光束变换规律及特性测量的教学实验仪器。 [0001] The present invention relates to a teaching experimental apparatus, in particular a Gaussian beam conversion rule and measured characteristics teaching experimental apparatus.

背景技术 Background technique

[0002] 高斯光束光强分布、高斯光束远场发散角及测量、高斯光束经透镜变换规律、高斯光束衍射倍率因子及测量是激光物理教学中重要的概念、规律和测量方法。 [0002] Gaussian beam intensity distribution, Gaussian beam divergence angle and far field measurements, the lens law transformed Gaussian beam, Gaussian beam and the beam quality factor measurements are important concepts, rules and methods of measurement laser physics teaching. 目前对远场发散角、衍射倍率因子测量的标准方法为:测量高斯光束经过透镜变换后,沿光束传播方向不同位置上的高斯光束光斑半径,利用最小二乘法对测量数据进行拟合计算后,得到衍射倍率因子和远场发散角,进一步获得衍射倍率因子。 Currently divergence angle of far field, the beam quality factor is measured by standard methods: After the measurement of Gaussian beam after the lens transformed, along different propagation direction of the beam spot radius of the Gaussian beam position, the least squares fit calculation of the measured data, to give the beam quality factor and the far field divergence angle is further obtained the beam quality factor. 刀口法测量光斑半径具有结构简单、操作方便、测量准确度高的特点,美国相干公司开发研制了基于刀口法测量高斯光束光斑半径的光束质量分析测量仪器,这些仪器都是以实验室科学测量为目的,对于仪器测量精度、 测量速度、测量光谱范围以及使用的便利性方面都有非常高的要求,因此在仪器中使用了多刀口切割、步进电机自动控制刀口扫描及移动过程、测量数据计算机软件自动处理等技术,同时整套仪器被封闭起来,以保证仪器测量的稳定性和使用寿命。 Knife-edge method of measuring beam radius has a simple structure, easy operation, high measurement accuracy characteristics, Coherent company developed a knife-edge method based on measurement of beam quality analysis measuring instruments Gaussian beam spot radius, these instruments are based on scientific measurement laboratory object for measurement precision, measurement speed, measuring the spectral range in terms of convenience and are used in very high demand, the use of a multi-blade cutting instrument, automatic control of the stepping motor and the moving knife-edge scan process, the computer measured data automatic software processing technology, while the whole apparatus is closed, to ensure the stability and service life instrument measured. 虽然这些技术对于提高仪器整体性能有很大的帮助,但仪器不适合应用在激光原理实验教学中,主要原因在于: (1)仪器价格昂贵,通常在10万元以上,难于在实验教学过程中推广;(2)测量过程和仪器结构都封闭在机箱内,以及测量数据的软件自动处理不利于学生对于测量过程的学习和掌握;(3)测量过程的自动化不利于培养学生的动手能力。 Although these techniques are very helpful for improving the overall performance of the instrument, but the instrument is not suitable for use in laser principle experiment teaching, mainly due to: (1) equipment is expensive, usually more than 10 million, it is difficult to experiment in the teaching process promotion; (2) the measurement process and instrument structure is enclosed in the chassis, as well as automatic measurement data processing software for the measurement process is not conducive to student learning and mastering; automation (3) of the measurement process is not conducive to cultivate the abilities of students.

发明内容 SUMMARY

[0003] 本实用新型的目的就是提供一种价格低廉、仪器耐用且便于学生直观学习掌握高斯光束变换规律及特性测量的教学实验仪器。 [0003] The purpose of the present invention is to provide a low price, durable instrument intuitive and easy to learn to master teaching students experimental apparatus Gaussian beam transformation rules and characteristics of the measurement.

[0004] 本实用新型可以通过如下方式来实现:导轨的一端设有激光器,导轨的另一端设有激光功率计;凸透镜设在激光器与激光功率计之间,刀口设在凸透镜与激光功率计之间。 [0004] The present invention may be achieved by: a laser guide provided at one end, the other end of the guide rail is provided with a laser power meter; lens disposed between the laser and the laser power meter, lens edge provided with the laser power meter between.

[0005] 所述的激光器与凸透镜之间设有衰减装置,或者是刀口与激光功率计之间设有衰减装置。 Said damping device is provided between the [0005] laser and a convex lens, or a damping means is provided between the blade and the laser power meter.

[0006] 所述的导轨上设有刻度。 The upper rail is provided with a scale according to [0006].

[0007] 本实用新型为全开放式,基本结构能直接观察,测量原理清晰直观,测量过程全部为手动测量,有助于学生对于高斯光束光斑半径、远场发散角以及衍射倍率因子概念及其相关测量方法的理解和掌握,并有助于提高学生的实验技能。 [0007] The present invention is a wide open, the basic structure can be observed directly, measuring principle clear and intuitive, all of the measurement process manual measurement, help students For a Gaussian beam spot radius, the far field divergence angle and beam quality factor and concepts understand and master the relevant measurement methods, and help improve students' experimental skills. 本实用新型具有价格低廉、仪器耐用不易损坏、结构简单的特点。 The model is inexpensive, durable and easy to damage the instrument, a simple structure characteristics.

附图说明 BRIEF DESCRIPTION

[0008] 图1为本实用新型的结构示意图。 [0008] Figure 1 is a schematic view of the structure of the new utility.

[0009] 图2为本实用新型的一个实施例。 [0009] FIG 2 present a new type of practical embodiment. [0010] 在图中:激光器1,凸透镜2,刀口3,激光功率计4,导轨5,衰减装置6。 [0010] In the drawings: a laser, a convex lens 2, the blade 3, the laser power meter 4, the guide rails 5, 6 damping device. 具体实施方式 Detailed ways

[0011] 下面结合实施例,对本实用新型作进一步的描述,但其不代表为本实用新型的唯一实施方式。 [0011] Example embodiments in conjunction with the following, further description of the present invention for, but does not represent the invention the only embodiment of the present embodiment.

[0012] 实施例一 [0012] Example a

[0013] 请阅图1,导轨5的一端安装有发射高斯光束的激光器1,高斯光束沿导轨5方向传播,导轨5的另一端安装有激光功率计4 ;激光器1可以是气体、半导体、固体或光纤激光器;激光功率计4可以是光电型、热释电型或热堆型激光功率计;凸透镜2安装在激光器1 与激光功率计4之间,刀口3安装在凸透镜2与激光功率计4之间。 [0013] Please See Figure 1, one end of the guide rail 5 is attached to the laser 1 emitted Gaussian beam, Gaussian beam propagation direction along the guide rails 5, 5 and the other end of the guide rail 4 is attached to the laser power meter; 1 may be a gas laser, a semiconductor, solid or a fiber laser; laser power meter 4 may be the photoelectric type, pyroelectric type or a thermopile laser power meter; lens 2 is mounted between the laser 1 and the laser power meter 4, the blade 3 is mounted on the convex lens 2 and the laser power meter 4 between. 刀口3固定在光学平移台上,使刀口3能在垂直于光束传播方向的平面内移动并切割高斯光束,刀口3在垂直于光束传播方向上的位置由光学平移台上的螺旋测微器控制并测量,经过刀口3边缘的激光束射入到激光功率计4内。 Blade 3 is fixed in the optical translation stage, so that the cutting edge 3 can be moved and Gaussian beam in a plane perpendicular to the propagation direction of the beam, the edge 3 of the optical micrometer translation stage controlled at a position perpendicular to the propagation direction of the beam and measuring, after the laser beam incident on the edge of the knife 3 to the laser power meter 4.

[0014] 实施例二 [0014] Second Embodiment

[0015] 请阅图2,导轨5的一端安装有激光器1,导轨5的另一端安装有激光功率计4 ;凸透镜2安装在激光器1与激光功率计4之间,刀口3安装在凸透镜2与激光功率计4之间; 激光器1与凸透镜2之间安装有衰减装置6,或者是刀口3与激光功率计4之间安装有衰减装置6;衰减装置是一片或一片以上的吸收式衰减片,可以是一块或一块以上的反射式衰减片,也可以是一块或一块以上偏振片。 [0015] Please See Figure 2, one end of a guide rail 5 is attached, the other end of the guide rail 5 is attached to the laser 4 laser power meter; lens 2 is mounted between the laser 1 and the laser power meter 4, the blade 2 and the lens 3 is mounted the laser power meter between 4; laser 1 and the convex lens between the two mounting damping device 6, or edge damping means mounted between 3 and 6 the laser power meter 4; or a damping means is one or more absorption attenuator, It may be one or more of a reflection-type attenuator, or may be a more a polarizing plate. 导轨5上可以直接标有刻度,也可以在导轨5上固定刻度尺,以有利于测量沿光束传播方向刀口3的位置。 Can be directly labeled with a scale on the guide rail 5, the scale may be fixed on the guide rails 5, to facilitate the measurement of the position of the blade 3 along the beam propagation direction.

[0016] 本实用新型测量和计算衍射倍率因子、远场发散角及对于高斯光束经过凸透镜的变换规律进行研究的基本理论和方法为:选取凸透镜位置为横坐标ζ轴的坐标零点,选取沿光束传播方向为ζ轴的正方向;激光器射出高斯光束经凸透镜变换后,在凸透镜右侧形成辅助束腰,根据Thomas F. Johnston 1998 年在Appl. Opt. (Vol. 37(21))上发表的Beam propagat ion(M2)measurement made as easy as it gets :the four-cuts method t中所述,凸透镜右侧光束光斑半径与位置坐标间满足: [0016] The present invention is measured and calculated diffraction quality factor, and far-field divergence angle for the basic theory and methods research through Gaussian beam transformation convex lens law: selecting lens position ζ coordinate zero abscissa axis, along a selected beam propagation direction is positive ζ-axis; the laser beam emitted by a Gaussian transform lens, an auxiliary lens in the right waist, according to Thomas F. Johnston 1998 years published in Appl Opt.. (Vol 37 (21).) beam propagat ion (M2) measurement made as easy as it gets: the four-cuts method t between said convex lens and the right optical beam spot radius position coordinates satisfy:

[0017] [0018] 式中W(Z)为凸透镜右侧坐标为ζ处的光斑半径,Wtl为辅助束腰的腰斑半径,Z0为辅助束腰的位置坐标,Zk为光束的瑞利长度,其定义为:光斑半径为λ/ϊ?Γ。 [0017] [0018] wherein W (Z) is the coordinates of the right lens is the beam radius at ζ, Wtl auxiliary waist waist spot radius, Z0 is the beam waist position coordinate auxiliary, Zk is the Rayleigh length of the beam , which is defined as: the spot radius of λ / ϊ Γ?. 的位置相对于束腰位置处的距离,其表达式为: Position with respect to the distance from the beam waist position, its expression is:

[0019] [0019]

[0020] 其中M2为光束衍射倍率因子,可以表达为: [0020] wherein the beam is the beam quality factor M2, can be expressed as:

[0021] [0021]

[0022] 为了计算方便,可以将⑴式表示为: [0022] For ease of calculation, it may be expressed as the formula ⑴:

[0023] [0023]

[0024] (4)式中的Α、B、C三项分别为:[0025] [0024] (4) in the formula Α, B, C are three: [0025]

[0026] 采用10% /90%刀口测量方法,利用刀口测量辅助束腰两侧不同位置的高斯光束光斑半径,利用最小二乘法对测量所得光斑半径进行二次方函数拟合,可以得到(4)式中的A、B、C三项,则\、z0, zE可以根据下式计算: [0026] The 10% / 90% knife edge measuring method using a knife edge measuring Gaussian beam waist spot radius secondary sides different positions, the resulting measurement spot radius fitting a quadratic function using the least square method to give (4 ) in the formula a, B, C three, then \, z0, zE can be calculated according to the formula:

[0027] [0027]

[0028] [0028]

[0029] [0029]

[0030] [0030]

由于通过拟合过程要确定三个未知数,因此要求在辅助束腰单侧的光斑半径测量点应大于3。 Since the process to be determined by fitting a three unknowns, thus requiring auxiliary beam waist spot radius on one side should be greater than three measurement points. 入射高斯光束远场发散角通过下列两种方式测量计算,测量凸透镜右侧焦点位置光斑半径ω”入射高斯光束远场发散角可表示为: Gaussian beam incident on the far field divergence angle is calculated by measuring the following two ways, the right lens focal position measuring beam radius ω "incident Gaussian beam far field divergence angle can be expressed as:

[0031] [0031]

[0032] 其中f为变换凸透镜的焦距。 [0032] where f is the focal length of the transform lens. 远场发散角还可以表示为: Far-field divergence angle can also be expressed as:

[0033] [0033]

[0034] 利用(5)式,根据拟合所得Wc^Pzk也可以确定入射高斯光束远场发散角。 [0034] using formula (5) The resulting Wc ^ Pzk fitting may determine the incident Gaussian beam far field divergence angle.

[0035] 为训练学生对高斯光束经过凸透镜的变换公式的正确使用,根据上述计算结果及凸透镜的变换公式,计算经过凸透镜变换前高斯光束的束腰半径和位置。 [0035] The train students on the proper use of Gaussian beams through the convex lens transformation formula, according to the above-described conversion formula and the calculation result of the convex lens, the convex lens is calculated after converting the Gaussian beam waist radius before and position. 具体方法:假设从激光器谐振腔发射一束光束衍射倍率因子M2 = 1的理想基模高斯光束,它的束腰Wt«位置应与上述衍射倍率因子为M2的实际光束的束腰位置相同,但衍射倍率因子为M2的实际光束的束腰半径Wcitl应为该理想基模高斯光束束腰半径的·^倍。 Specific methods: Suppose one light beam emitted beam quality factor M2 = 1 over the fundamental mode Gaussian beam from the laser cavity, it waist Wt «position above the beam quality factor should be the same as the actual position of the beam waist and M2, but the beam quality factor M2 of the actual beam waist radius that should Wcitl over fundamental Gaussian beam waist radius · ^ times. 该基模高斯光束经过凸透镜变换后在凸透镜右侧会形成束腰,束腰位置与实际高斯光束在凸透镜右侧所形成的辅助束腰位置相同都为ζο,但基模高斯光束束腰半径《。 The fundamental mode Gaussian beam after the lens will transform the right lens formed beam waist, the beam waist position of the same auxiliary Gaussian beam waist position and the actual lens is formed on the right side are ζο, but the fundamental Gaussian beam waist radius " . 应为: Should be:

[0036] [0036]

[0037] 理想基模高斯光束变换后束腰半径ω ^、位置坐标Z(l与变化前光束束腰半径Wtltl、束腰相对透镜的距离1之间满足下列两式: [0037] After the conversion over the fundamental Gaussian beam waist radius ω ^, position coordinate Z (l front and change the beam waist radius Wtltl, satisfy distance between the beam waist relative to the lens 1 the following formulas:

[0040] 根据(11-13)式就可以计算出经凸透镜变换前的基模高斯光束束腰半径Wt«和束腰位置,将《0。 [0040] The (11-13) can be calculated by the formula fundamental Gaussian beam waist radius Wt «front waist positions and transformed by lens, and" 0. 乘以ViP就为实际入射高斯光束光斑半径W, ViP multiplied to the actual incident Gaussian beam spot size W,

Claims (3)

  1. 一种高斯光束变换规律及特性测量教学实验仪,其特征在于导轨(5)的一端设有激光器(1),导轨(5)的另一端设有激光功率计(4);凸透镜(2)设在激光器(1)与激光功率计(4)之间,刀口(3)设在凸透镜(2)与激光功率计(4)之间。 Gauss law and characteristic measuring beam transforming teaching experimental device, wherein one end of the guide rail (5) is provided with the other end of the laser (1), the guide rail (5) is provided with a laser power meter (4); lenticular lens (2) provided between the laser (1) with a laser power meter (4), blade (3) is provided between the lens (2) with a laser power meter (4).
  2. 2.根据权利要求1所述的高斯光束变换规律及特性测量教学实验仪,其特征在于所述的激光器⑴与凸透镜⑵之间设有衰减装置(6),或者是刀口(3)与激光功率计⑷之间设有衰减装置(6)。 The conversion rule and Gaussian beam characteristic measuring apparatus according to teaching experiment claim 1, characterized in that the damping means is provided (6) between the laser and the convex lens ⑴ ⑵, or knife-edge (3) with a laser power provided with damping means (6) between the count ⑷.
  3. 3.根据权利要求1所述的高斯光束变换规律及特性测量教学实验仪,其特征在于所述的导轨(5)上设有刻度。 The conversion rule and Gaussian beam characteristic measuring apparatus according to teaching experiment claim 1, wherein said guide rail is provided on the scale (5).
CN201020026726XU 2010-01-14 2010-01-14 Gaussian beam transformation rule and characteristic measurement teaching experimental instrument CN201622746U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102519587A (en) * 2011-12-30 2012-06-27 山西大学 Simple device for instantly measuring light intensity distribution of laser beams
CN106404189A (en) * 2016-09-27 2017-02-15 深圳市太赫兹科技创新研究院 Method for measuring terahertz beam parameter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102519587A (en) * 2011-12-30 2012-06-27 山西大学 Simple device for instantly measuring light intensity distribution of laser beams
CN102519587B (en) 2011-12-30 2014-03-05 山西大学 Device for measuring light intensity distribution of laser beams
CN106404189A (en) * 2016-09-27 2017-02-15 深圳市太赫兹科技创新研究院 Method for measuring terahertz beam parameter
WO2018059135A1 (en) * 2016-09-27 2018-04-05 深圳市太赫兹科技创新研究院 Method for measuring parameters of terahertz beam
CN106404189B (en) * 2016-09-27 2018-06-26 深圳市太赫兹科技创新研究院 The method of measuring the THz beam parameters

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