CN211149890U

CN211149890U - Experimental device for measuring focal length of laser thermal lens

Info

Publication number: CN211149890U
Application number: CN201921237459.8U
Authority: CN
Inventors: 郭晓春; 李文姝; 曹萍萍
Original assignee: China Criminal Police University
Current assignee: China Criminal Police University
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-07-31
Anticipated expiration: 2029-08-02

Abstract

The utility model discloses an experimental apparatus is measured to laser thermal lens focus, including laser instrument A, laser instrument B, collimator, adjustable aperture diaphragm, sample lens, half anti-half mirror, convex lens, laser camera, display, linear dimmer, optics guide rail and two dimension slide, the optics guide rail is "T" shape structure, slide on the optics guide rail be equipped with the two dimension slide are equipped with a plurality of being used for placing laser instrument A, collimator, adjustable aperture diaphragm, sample lens, half anti-half mirror, convex lens, linear dimmer, laser instrument B and laser camera respectively, display electric connection is in laser camera. The utility model provides a most shortcoming that only stops under the background of qualitative demonstration of thermal lens effect laboratory glassware, can provide a laser thermal lens focus measurement experimental apparatus for the physics experiment teaching of colleges and universities.

Description

Experimental device for measuring focal length of laser thermal lens

Technical Field

The utility model relates to an experimental apparatus technical field especially relates to a laser thermal lens focus measurement experimental apparatus.

Background

The temperature generated by the semiconductor laser during working can cause the thermal deformation of the crystal surface, and the distortion of the thermal lens generated by the temperature gradient distribution in the gain medium occupies a dominant position, so that the instability of the output power and the coupling of various modes are caused, the improvement of the laser power is limited, and the performance of the solid laser is seriously influenced.

The laser thermal lens effect is one of the important factors influencing the laser performance, and directly influences the parameters of the laser resonant cavity, such as stability, cavity mode size, beam quality, laser efficiency and the like. In the research of the laser thermal lens effect, the design of a resonant cavity and the calculation of a laser mode, the most important is the accurate measurement of the focal length of the thermal lens.

Therefore, a laser thermal lens effect focal length measuring device is in need of research.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the shortcoming that exists among the prior art, provide a laser thermal lens focus and measure experimental apparatus, including laser instrument A, laser instrument B, collimator, adjustable aperture diaphragm, sample lens, semi-reflecting semi-transparent mirror, convex lens, laser camera, display, linear dimmer, optical guide and two dimension slide, the optical guide is "T" shape structure, slide on the optical guide and be equipped with the two dimension slide is equipped with a plurality of being used for placing laser instrument A, collimator, adjustable aperture diaphragm, sample lens, semi-reflecting semi-transparent mirror, convex lens, linear dimmer, laser instrument B and laser camera respectively, display electric connection is in laser camera.

It is right to the utility model discloses a further description, be equipped with laser camera in the vertical direction of optics guide rail, the both ends of the horizontal direction of optics guide rail are equipped with laser instrument A and laser instrument B respectively, laser instrument A is close to laser instrument B's one end and is equipped with collimator, adjustable aperture diaphragm, sample lens, half-reflecting half mirror, convex lens and linear dimmer in proper order, laser camera passes through the data line and connects in the display.

To the utility model discloses a further description, the half reflection half mirror that is equipped with between sample lens and the convex lens is 45 degrees contained angles with the horizontal direction of optics.

For further description of the present invention, the wavelengths emitted by the laser a and the laser B are 532 nm.

For further description of the present invention, the laser Camera is a USB-CCD L aser Camera.

For further description of the present invention, laser a is the same as laser B.

For further description of the present invention, the focal length of the convex lens is 150 mm.

To the description of the present invention, the laser camera is electrically connected to the computer through a data line to display data on the display.

By adopting the technical scheme, the method has the following beneficial effects:

the utility model solves the defect that most thermal lens effect experimental instruments only stay under the background of qualitative demonstration, can provide a laser thermal lens focal length measurement experimental device for the physics experiment teaching of colleges and universities, adopts a coaxial double-beam method to enable a heating beam to form a thermal lens effect, a laser B emits approximate parallel light with the wavelength of 532nm, the optical power can be changed through a linear dimmer, the approximate parallel light is converged after passing through a convex lens with the focal length of 150mm, a sample is placed on a converging point of laser, the thermal lens effect is generated at the moment, the laser A and the laser B are completely the same, the approximate parallel light with the wavelength of 532nm is emitted, the parallel light is generated through a collimator, the light path is directly adjusted by reducing the light spot through an adjustable pinhole diaphragm, the parallel light spot irradiates on a sample lens which generates the thermal lens effect, a half-reflecting half-transparent mirror is placed at an angle of 45 degrees between the sample lens and the convex lens, the light spot passing through the sample lens is reflected to a vertical light path, the laser camera is used for receiving and recording data, and the thermal lens focal length is calculated according to the similar triangle principle.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a light path diagram of the present invention;

in the figure: 1-laser A; 2-laser B; 3-a collimator; 4-adjustable aperture diaphragm; 5-sample lens; 6-half reflecting and half transmitting mirror; a 7-convex lens; 8-a laser camera; 9-a display; 10-linear dimmer; 11-a two-dimensional slide; 12-optical guide.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

In embodiment 1, an experimental apparatus for measuring focal length of a laser thermal lens shown in fig. 1 to 2 includes a laser a1, a laser B2, a collimator 3, an adjustable aperture stop 4, a sample lens 5, a half mirror 6, a convex lens 7, a laser Camera 8, a display 9, a linear light reducer 10, an optical guide 12 and a two-dimensional slide carriage 11, where the optical guide 12 is a "T" -shaped structure, the two-dimensional slide carriage 11 is slidably disposed on the optical guide 12, the two-dimensional slide carriage 11 is provided with a plurality of cameras for respectively placing the laser a1, the collimator 3, the adjustable aperture stop 4, the sample lens 5, the half mirror 6, the convex lens 7, the linear light reducer 10, the laser B865 2 and the laser Camera 8, the display 9 is electrically connected to the laser Camera 8 in a vertical direction of the optical guide 12, two ends in a transverse direction of the optical guide 12 are respectively provided with the laser a1 and the laser B2, one end of the laser a1 close to the laser B4833 is provided with the laser Camera, the laser Camera 8 is sequentially connected to the laser Camera 4833, the laser Camera 2 is provided with the laser Camera 2, the laser Camera 2 is connected to the laser Camera 2, the laser Camera is connected to the laser Camera 2, the laser Camera is connected to the laser Camera 2, the CCD Camera 2, the laser Camera is connected to the laser Camera 2, the laser Camera for displaying data, the laser data, the data is taken as data, the data of.

The utility model provides a sample lens 5 is the thick thin sauce layer of 200 mu m, places 3 thickness side by side in the middle of two slide glass and be 200 mu m annular red copper sheet, instils into the soy sauce in the annular red copper sheet in the middle, presss from both sides the slide glass both ends with 2 long tails, because the slide glass both ends also have the thick annular red copper sheet of 200 mu m, so can not let the slide glass produce deformation when long tail presss from both sides, makes the thick thin sauce layer of 200 mu m from this.

The utility model discloses a when carrying out the experiment, divide into heating beam and detecting beam, the primary function of heating beam is to form the thermal lens effect, and the primary function of detecting beam is to measure thermal lens focus. The sample lens was a 200 μm thin sauce film, and a 200 μm thick circular red copper plate was sandwiched between two glass slides and fixed with a binder clip. When the laser convergence point irradiates the thin soy sauce film, a thermal lens effect is generated, and the thin soy sauce film is similar to a concave lens. Heating beam: the laser B2 emits a beam of approximately parallel light with the wavelength of 532nm, the linear dimmer 10 is adjusted to change the light power of the laser, the approximately parallel light can form convergence after passing through the convex lens 7 with the focal length of 150mm, a sample is placed on a convergence point of the laser, a thermal lens effect can be generated at the moment, and the thin soy sauce film approximately becomes a concave lens. A probe beam: the laser A1 is completely the same as the laser B2, emits approximate parallel light with the wavelength of 532nm, generates parallel light through a collimator 3, reduces the light spot through an adjustable small aperture diaphragm 4 to be direct, adjusts the light path, enables the parallel light spot to irradiate a sample layer which generates the thermal lens effect, at the moment, a beam of parallel light is equivalent to irradiate a concave lens, a half-reflecting and half-transmitting lens 6 is obliquely arranged between the sample lens 5 and a 150mm convex lens 7 at an angle of 45 degrees, reflects the light spot passing through the sample lens 5 to a vertical light path, uses the laser camera 8 to collect a light spot image, shields the laser of the laser B2, the thermal lens effect disappears, the dark spot in the light spot image collected by the laser camera 8 also disappears, moves the laser camera 8 for a plurality of times in the vertical direction of the optical guide rail 12, records the position of the laser camera 8 on the optical guide rail 12 and records the dark spot collected by the computer recording laser camera, the thermal lens focal length is calculated by the similar triangle method.

The utility model adopts a coaxial double-beam method, the approximate parallel light with the wavelength of 532nm is launched out by the laser B2, the optical power can be changed through the linear dimmer 10, the approximate parallel light with the wavelength of 532nm is converged after passing through the convex lens 7 with the focal length of 150mm, the sample is arranged on the convergent point of the laser, the thermal lens effect is generated at the moment, the laser A1 is completely the same as the laser B2, the approximate parallel light with the wavelength of 532nm is launched out, the parallel light is generated through the collimator 3, the light spot is reduced through the adjustable small-hole diaphragm 4 to directly adjust the light path, the parallel light spot is irradiated on the sample lens 5 which generates the thermal lens effect, the half-reflecting and half-transmitting mirror 6 is obliquely arranged at an angle of 45 degrees between the sample lens 5 and the convex lens 7, the light spot passing through the sample lens 5 is reflected to the vertical light path, the data is received and recorded by the laser camera 8, the thermal lens focal length is calculated according, the use of physical experiments is satisfied.

Having described the basic principles and essential features of the invention, it will be understood by those skilled in the art that the present invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed, and which are defined by the appended claims and their equivalents.

Claims

1. The utility model provides a laser thermal lens focus measures experimental apparatus, its characterized in that includes laser instrument A, laser instrument B, collimator, adjustable aperture diaphragm, sample lens, half anti-half mirror, convex lens, laser camera, display, linear dimmer, optics guide rail and two dimension slide, the optics guide rail is "T" shape structure, slide on the optics guide rail be equipped with two dimension slide be equipped with a plurality ofly be used for placing laser instrument A, collimator, adjustable aperture diaphragm, sample lens, half anti-half mirror, convex lens, linear dimmer, laser instrument B and laser camera respectively, display electric connection is in laser camera.

2. The experimental device for measuring the focal length of the laser thermal lens as claimed in claim 1, wherein a laser camera is arranged in the vertical direction of the optical guide rail, a laser A and a laser B are respectively arranged at two ends in the transverse direction of the optical guide rail, a collimator, an adjustable aperture diaphragm, a sample lens, a semi-reflecting and semi-transparent mirror, a convex lens and a linear dimmer are sequentially arranged at one end of the laser A close to the laser B, and the laser camera is connected to a display through a data line.

3. The experimental device for measuring the focal length of the laser thermal lens as claimed in claim 1, wherein a half-reflecting and half-transmitting mirror arranged between the sample lens and the convex lens forms an included angle of 45 degrees with the optical transverse direction.

4. The experimental apparatus for measuring focal length of a laser thermal lens according to claim 2, wherein the wavelengths emitted by the laser a and the laser B are both 532 nm.

5. The experimental apparatus for measuring focal length of laser thermal lens as claimed in claim 2, wherein said laser Camera is USB-CCD L aser Camera.

6. The experimental apparatus for measuring focal length of laser thermal lens according to claim 2, wherein the laser a is the same as the laser B.

7. The experimental apparatus for measuring focal length of a laser thermal lens as claimed in claim 2, wherein the focal length of the convex lens is 150 mm.

8. The experimental apparatus for measuring focal length of a laser thermal lens as claimed in claim 1, wherein the laser camera is electrically connected to a computer through a data line to display data on a display.