Teaching equipment for laser intensity and light spot characteristics

Abstract

The utility model relates to teaching equipment for laser intensity and light spot characteristics, which comprises a slide rail, a laser emitting device, a CCD camera and terminal equipment, and is characterized in that the laser emitting device comprises a laser source and a resonant cavity, the resonant cavity comprises a convergence optical system, a laser medium and an output mirror, and the output mirror is arranged on the slide rail in a lockable sliding fit manner; the CCD camera is arranged on the sliding rail in a sliding fit manner in a lockable manner; the terminal unit is provided with a control end, and the control unit is used for processing images captured by the CCD camera to obtain laser light intensity energy distribution, laser spot radius and laser edge. The distance between the output mirror and the laser medium is adjusted by moving the output mirror to change the light emitting power of the laser, the distance between the CCD camera and the output mirror is adjusted by moving the CCD camera to capture two laser spot images with different distances, teaching equipment can be arranged on a large scale, the light emitting power of the laser generator can be changed, and the teaching efficiency is improved. And students can be helped to know the laser intensity and light spot characteristics.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of teaching equipment, especially a kind of teaching equipment for laser light intensity and spot characteristics. BACKGROUND

[0002] At present, the teaching equipment for laser light intensity and spot characteristics mainly includes laser generator and laser spot analyzer.

[0003] Laser generator emits laser, and laser spot analyzer directly analyzes and evaluates the laser spot quality of laser generator emitted laser, and can measure the shape, size, energy distribution and other characteristics of spot.

[0004] However, the price of a laser spot analyzer is relatively high, generally from several ten thousand to several hundred thousand, and the use cost is high, so that a laboratory can only be equipped with several, which is not conducive to teaching, in addition, the light output power of laser generator is fixed, and multiple laser generators with different powers need to be purchased to study the influence of light output power on spot characteristics, which also leads to cost increase, and is not conducive to equipment management and maintenance in later period.

[0005] Therefore, a low-cost teaching equipment that can be equipped on a large scale is needed, which can change the light output power of laser generator and help students understand laser light intensity and spot characteristics. TECHNICAL SOLUTION

[0006] In order to solve the above technical problems, the utility model provides a kind of teaching equipment for laser light intensity and spot characteristics.

[0007] The utility model provides a kind of teaching equipment for laser light intensity and spot characteristics adopts following technical scheme:

[0008] A kind of teaching equipment for laser light intensity and spot characteristics, comprising:

[0009] Slide rail;

[0010] Laser emission device, including laser source and resonant cavity, the resonant cavity includes converging optical system, laser medium and output mirror, the converging optical system includes laser medium, the output mirror is slidably fitted with lockable mode in slide rail for adjusting the interval between output mirror and laser medium;

[0011] CCD camera, CCD camera is slidably fitted with lockable mode in slide rail, the output mirror laser is perpendicular to CCD camera, and CCD camera is used to capture the image of laser spot;

[0012] A terminal device is configured to receive an image captured by a CCD camera, and the terminal device has a control unit configured to process the image captured by the CCD camera to obtain a laser light intensity energy distribution, a laser light spot radius, and a laser light edge.

[0013] Optionally, the slide rail has a track, and the slide block one and the slide block two are arranged on the track in a sliding manner, the output mirror is arranged on the slide block one, and the CCD camera is arranged on the slide block two.

[0014] Optionally, the slide block one is provided with a connecting portion one, the output mirror is provided with a fixing portion one, the fixing portion one is arranged on the connecting portion one and is fixed by a fixing member one, the slide block two is provided with a connecting portion two, and the CCD camera is provided with a fixing portion two, the fixing portion two is arranged on the connecting portion two and is fixed by a fixing member two.

[0015] Optionally, the slide rail is provided with a scale along a length direction of the slide rail.

[0016] Optionally, the track is provided with a fixing tooth on an inner side of the track along a length direction of the track, the slide block one and the slide block two are respectively provided with a meshing tooth one and a meshing tooth two in a sliding fit manner, the meshing tooth one and the meshing tooth two are magnetic members, the limiting member one and the limiting member two are magnets, and the magnets are arranged on the track to drive the corresponding meshing tooth one and / or the meshing tooth two to slide so that the meshing tooth one and / or the meshing tooth two are engaged with the fixing tooth to complete the sliding limitation of the slide block one and the slide block two.

[0017] Optionally, the laser beam emitted by the laser emitting device is a Gaussian beam, and a laser center of the Gaussian beam corresponds to a point with the highest energy or gray value.

[0018] Optionally, the terminal device is a computer, a tablet computer, or a mobile phone.

[0019] Optionally, the CCD camera is provided with an attenuation sheet.

[0020] In summary, the utility model discloses at least one of the following beneficial technical effects: the change of the light output power of laser is realized by adjusting the interval between the output mirror and the laser medium through the movement of the output mirror, the laser spot image of two different intervals is captured by adjusting the interval between the CCD camera and the output mirror through the movement of the CCD camera, the different laser spot images captured by the CCD camera are analyzed through the terminal, and the laser light intensity energy distribution, laser spot radius and laser edge are obtained; the cost of the CCD camera is far lower than that of the laser spot analyzer, the terminal device can adopt the computer of the student, and the laser spot analyzer does not need to be purchased separately, can be equipped as a teaching device on a large scale, can change the light output power of the laser generator, and can assist the student to understand the laser light intensity and spot characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the whole structure schematic diagram of the utility model embodiment;

[0022] Figure 2 It is the structure schematic diagram of the utility model embodiment slide rail and sliding block one;

[0023] Figure 3 It is the divergence angle structure schematic diagram of the utility model embodiment.

[0024] Mark explanation: 1, slide rail;2, laser source;3, converging optical system;4, output mirror;5, CCD camera;6, scale line;7, fixed tooth;8, meshing tooth one;9, spring;10, sliding block one. DETAILED DESCRIPTION

[0025] The following will be combined with the Figures 1-3 The utility model is further explained in detail.

[0026] The utility model embodiment discloses a kind of teaching equipment for laser light intensity and spot characteristics.

[0027] Refer to Figure 1 、 Figure 2 、 Figure 3The utility model provides a kind of teaching equipment for laser light intensity and spot characteristics, including slide rail 1, laser emission device, CCD camera 5 and terminal equipment, laser emission device, including laser source 2 and resonant cavity, resonant cavity includes converging optical system 3, laser medium and output mirror 4, output mirror 4 is slidably fitted with lock in slide rail 1 for adjusting the interval between output mirror 4 and laser medium;CCD camera 5 is slidably fitted with lock in slide rail 1, output mirror 4 laser and CCD camera 5 are perpendicular, and CCD camera 5 is used to capture the image of laser spot;Terminal equipment is used to receive the image captured by CCD camera 5, and the terminal equipment has control unit, and the control unit is used to process the image captured by CCD camera 5, obtains laser light intensity energy distribution, laser spot radius and laser edge.By moving output mirror 4, the interval between output mirror 4 and laser medium is adjusted to realize the change of laser output power, and the interval between CCD camera 5 and output mirror 4 is adjusted by moving CCD camera 5 to capture the image of laser spot with two different intervals, and the different laser spot images captured by CCD camera 5 are analyzed by terminal to obtain laser light intensity energy distribution, laser spot radius and laser edge.The cost of CCD camera 5 is much lower than that of laser spot analyzer, and the terminal equipment can use the computer brought by students, so that laser spot analyzer is not needed to be purchased separately, and the teaching equipment can be equipped on a large scale, the output power of laser generator can be changed, and students can understand laser light intensity and spot characteristics.

[0028] In the embodiment, the laser beam emitted by the laser emission device is a Gaussian beam, and the laser center of the Gaussian beam corresponds to the point with the highest energy, i.e., the highest gray value. In the embodiment, the transverse amplitude distribution of the fundamental mode radiation field emitted by the resonant cavity of the laser emission device complies with a Gaussian function. The Gaussian beam has high symmetry, and the transverse distribution thereof complies with a Gaussian distribution. The Gaussian beam radius spreads with the increase of distance but has a constant proportion, which facilitates the research of students on the laser light intensity distribution and the laser spot characteristics.

[0029] The laser emission device includes a laser source 2 and a resonant cavity, and the resonant cavity includes a converging optical system 3, a laser medium and an output mirror 4. The converging optical system 3 includes a coupling mirror, a high-reflection mirror and the laser medium. The converging optical system 3 is used to guide, shape and focus the light beam, to ensure the effective propagation of the light beam in the laser medium and to form the required Gaussian beam characteristics when output. The laser medium is the core part of laser generation, and emits laser light through the stimulated radiation process. The light intensity distribution of the fundamental mode laser beam is Gaussian, which becomes a Gaussian beam. The output mirror 4 is located at the output end of the laser resonant cavity and is used to output the amplified Gaussian beam through the resonant cavity.

[0030] In the embodiment, the output mirror 4 and the CCD camera 5 are detachably arranged on the corresponding sliding block one 10 and the sliding block two. The sliding block one 10 is provided with a connecting part one, and the output mirror 4 is provided with a fixing part one. The fixing part one is arranged on the connecting part one and is fixed by a fixing part one. The connecting part one is a groove, the fixing part one is a protrusion, and the fixing part one is a bolt. The bolt passes through the sliding block one 10 and is arranged in the groove and the protrusion. The fixing of the output mirror 4 and the sliding block one 10 is completed. It is convenient to replace different output mirrors 4 in the later period, and it is convenient to store and accommodate.

[0031] Similarly, the sliding block two is provided with a connecting part two, and the CCD camera 5 is provided with a fixing part two. The fixing part two is arranged on the connecting part two and is fixed by a fixing part two. The fixing of the CCD camera 5 and the sliding block two is completed. It is convenient to replace the CCD camera 5 in the later period, and it is convenient to store and accommodate.

[0032] The sliding rail 1 has a track. The sliding block one 10 and the sliding block two are arranged on the track. The output mirror 4 is arranged on the sliding block one 10, and the CCD camera 5 is arranged on the sliding block two. The sliding rail 1 is provided with a limiting part one for limiting the sliding of the sliding block one 10 and a limiting part two for limiting the sliding of the sliding block two.

[0033] The sliding rail 1 is provided with a scale line 6 along the length direction of the sliding rail 1. The scale line 6 can facilitate students to study. The output mirror 4 and the CCD camera 5 are slid to the corresponding distance. The movement is more accurate. In addition, the relationship between the output mirror 4, the CCD camera 5 and the converging optical system 3 can be explored through the laser light intensity distribution and the light spot characteristics output by the terminal.

[0034] The inner side of the track is provided with a fixed tooth 7 along the length direction of the track. The sliding block one 10 and the sliding block two are respectively provided with a meshing tooth one 8 and a meshing tooth two corresponding to the sliding cooperation. The sliding block one 10 and the sliding block two are respectively provided with a containing groove for containing the meshing tooth one 8 and the meshing tooth two. The meshing tooth one 8 and the meshing tooth two are magnetic parts. The limiting part one and the limiting part two are magnets. The magnets are placed on the track to drive the corresponding meshing tooth one 8 and / or the meshing tooth two to slide to make the meshing tooth one 8 and / or the meshing tooth two engage with the fixed tooth 7. The sliding of the sliding block one 10 and the sliding block two is limited. The meshing tooth one 8 and the meshing tooth two are attracted out by the magnet and engaged with the fixed tooth 7 to limit the sliding of the sliding block one 10 and the sliding block two. The sliding of the sliding block one 10 and the sliding block two is more accurate. In addition, the magnet can be placed on the track to form a magnetic field, or the magnet can be removed from the track to not generate a magnetic field. Whether the magnetic field generated by the magnet affects the research on the laser light intensity distribution and the laser light spot characteristics can be explored.

[0035] In this embodiment, springs 9 are correspondingly provided inside sliding block 10 and sliding block 2. Springs 9 are used to generate an inward preload force on meshing teeth 18 and meshing teeth 2. This preload force is less than the magnetic force of the magnet, so that the magnet can overcome the preload force of spring 9 and make meshing teeth 18 and meshing teeth 2 extend and mesh with fixed teeth 7. When the magnet is removed, the elastic element causes meshing teeth 18 and meshing teeth 2 to retract and separate from fixed teeth 7.

[0036] The terminal device is a computer, tablet, or mobile phone. In this embodiment, the terminal device is a computer, and the computer is connected to an external Gaussian filter. The Gaussian filter can be implemented on the computer via software. For example, in image processing software, the Gaussian filtering function can be selected to smooth the image.

[0037] This invention analyzes the laser intensity and spot characteristics by capturing images with a CCD camera 5 and then using an algorithm for analysis.

[0038] The laser intensity distribution is processed using a Gaussian filter, as follows:

[0039] Image preprocessing: The images captured by the CCD camera 5 are preprocessed using a Gaussian filter. The Gaussian filter can effectively suppress noise that follows a normal distribution, making the image smoother and facilitating subsequent analysis.

[0040] Light intensity distribution extraction: After the image is processed by the Gaussian filter, the high frequency components are weakened and the low frequency components are preserved, thus highlighting the outline and intensity distribution of the laser spot;

[0041] Data analysis and fitting: Extract the grayscale information of the light spot through image processing programs and convert it into light intensity distribution data.

[0042] The divergence angle measurement involves capturing an image of the laser beam spot at a specific location using a CCD camera 5. The spot is then analyzed by moving the CCD camera to two different distances. The analysis formula is as follows:

[0043]

[0044] Where L is the displacement of the CCD camera 5, and dfi and dni are the spot diameters at two different distances. Since it is a small angle, the tangent value can be approximated as the size of the angle.

[0045] Other light spot characteristics, such as

[0046] The other laser characteristics can all be obtained using the corresponding algorithms. All that is needed is for the CCD camera 5 to acquire the laser spot image. How to transmit the image to the terminal device and how to perform characteristic analysis by installing the corresponding software or executing the corresponding algorithm on the terminal device are existing technologies and will not be elaborated here.

[0047] This invention eliminates the need for a professional and expensive laser spot analyzer, and the application scenarios of laser spot analyzers are not as extensive as those of the equipment in this invention. We only need a CCD camera 5, which has a wider range of applications, not only in the experimental scenarios of this invention, but also in machine vision, etc., achieving multiple uses with one device, maximizing the use of the equipment, and avoiding the waste of teaching resources. The terminal uses the student's own computer, which allows students to conduct analysis anytime and anywhere. Using a laser spot analyzer alone only allows for use in the laboratory, while using a computer allows students to transmit the collected images to the terminal, enabling analysis anytime and anywhere, making it easier for students to master knowledge and develop their thinking abilities.

[0048] The CCD camera 5 is equipped with an attenuator to reduce light intensity, which facilitates imaging and prevents the CCD camera 5's photosensitive chip from burning out.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A teaching device for laser intensity and spot characteristics, characterized in that: include: Slide rail; A laser emitting device includes a laser source and a resonant cavity. The resonant cavity includes a converging optical system, a laser medium, and an output mirror. The converging optical system includes a laser medium. The output mirror is slidably mounted on a slide rail in a lockable manner to adjust the distance between the output mirror and the laser medium. The CCD camera is slidably mounted on a slide rail in a lockable manner. The output laser mirror is perpendicular to the CCD camera, and the CCD camera is used to capture images of the laser spot. A terminal device for receiving images captured by a CCD camera. The terminal device has a control unit for processing the images captured by the CCD camera to obtain laser intensity energy distribution, laser spot radius, and laser edge.

2. The teaching equipment for laser intensity and spot characteristics according to claim 1, characterized in that: The slide rail has a track, on which a sliding block one and a sliding block two are slidably disposed. The output mirror is disposed on the sliding block one, and the CCD camera is disposed on the sliding block two. The slide rail is provided with a limiting member one for limiting the sliding of the sliding block one and a limiting member two for limiting the sliding of the sliding block two.

3. The teaching equipment for laser intensity and spot characteristics according to claim 2, characterized in that: The first sliding block is provided with a first connecting part, the first output mirror is provided with a first fixing part, the first fixing part is provided on the first connecting part and fixed by the first fixing member, the second sliding block is provided with a second connecting part, the second CCD camera is provided with a second fixing part, the second fixing part is provided on the second connecting part and fixed by the second fixing member.

4. The teaching equipment for laser intensity and spot characteristics according to claim 2, characterized in that: The slide rail has scale lines along its length.

5. The teaching equipment for laser intensity and spot characteristics according to claim 3, characterized in that: The inner side of the track is provided with fixed teeth along its own length direction. The sliding block one and the sliding block two are respectively provided with meshing teeth one and two in sliding engagement. The meshing teeth one and two are magnetic components. The limiting component one and the limiting component two are magnets. The magnets are placed on the track to drive the corresponding meshing teeth one and / or meshing teeth two to slide so that the meshing teeth one and / or meshing teeth two engage with the fixed teeth to complete the sliding restriction of the sliding blocks one and two.

6. The teaching equipment for laser intensity and spot characteristics according to claim 1, characterized in that: The laser beam emitted by the laser emitting device is a Gaussian beam, and the center of the Gaussian beam corresponds to the point with the highest energy, i.e., the gray value.

7. The teaching equipment for laser intensity and spot characteristics according to claim 1, characterized in that: The terminal device is a computer, tablet, or mobile phone.

8. The teaching equipment for laser intensity and spot characteristics according to claim 1, characterized in that: The CCD camera is equipped with an attenuator.

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