CN-121982960-A - Laser parameter measuring device for experimental teaching

Abstract

The invention discloses a laser parameter measuring device for experimental teaching. The device comprises a helium-neon laser, a variable beam expander, a first right-angle prism, a second right-angle prism, a first slider, a second slider, a first guide rail, a second guide rail, a laser power meter, a translation table, a cushion block, a bottom plate, a first supporting rod and one or more second supporting rods, wherein the helium-neon laser and the variable beam expander are arranged on the bottom plate and coaxially, the first right-angle prism and the second right-angle prism are arranged on the guide rails respectively through the sliders, the laser power meter is arranged on the bottom plate through the cushion block, the variable beam expander is used for adjusting the size of a received laser spot, the adjusted laser is received by the laser power meter after sequentially passing through the first right-angle prism and the second right-angle prism, the travel direction of the translation table is perpendicular to the axial direction of the first guide rail and the second guide rail, and the translation table is used for driving the laser power meter to move so as to detect the spot at a near field or far field preset position. The device provided by the invention can be used for laser output parameter measurement experiments.

Inventors

• CHEN HAO
• ZHAO ZHIBIN
• QIAO ZHONGLIANG
• LI ZAIJIN
• Qu Die
• LI LIN
• ZENG LINA
• LIU GUOJUN

Assignees

• 海南师范大学

Dates

Publication Date

20260505

Application Date

20240312

Claims (7)

1. 1. The laser parameter measuring device for experimental teaching is characterized by comprising a helium-neon laser (1), a variable beam expander (2), a first right-angle prism (3), a second right-angle prism (4), a first sliding block (5-1), a second sliding block (5-2), a first guide rail (6-1), a second guide rail (6-2), a laser power meter (7), a translation table (8), a cushion block (9), a bottom plate (10), a first supporting rod (11) and one or more second supporting rods (12); the variable beam expander (2) is arranged on the bottom plate (10) through the first support rod (11) and is coaxially arranged with the helium-neon laser (1) so that laser light output by the helium-neon laser (1) is input to the variable beam expander (2); The laser power meter comprises a first guide rail (6-1) and a second guide rail (6-2), wherein the first guide rail (6-1) is arranged in parallel, a first right-angle prism (3) is arranged on the first slider (5-1), the first slider (5-1) is arranged on the first guide rail (6-1) and can drive the first right-angle prism (3) to move on the first guide rail (6-1) along the axial direction of the guide rail, a second right-angle prism (4) is arranged on the second slider (5-2), the second slider (5-2) is arranged on the second guide rail (6-2) and can drive the second right-angle prism (4) to move on the second guide rail (6-2) along the axial direction of the guide rail, a cushion block (9) is arranged on a base plate (10), a translation table (8) is arranged on the cushion block (9), and a laser power meter (7) is arranged on the translation table (8); The variable beam expander (2) is used for adjusting the size of a received laser spot, and the adjusted laser is received by the laser power meter (7) after passing through the first right-angle prism (3) and the second right-angle prism (4) in sequence; the travel direction of the translation table (8) is perpendicular to the axial directions of the first guide rail (6-1) and the second guide rail (6-2), and the translation table (8) is used for driving the laser power meter (7) to move so as to detect light spots at a preset position of a near field or a far field.
2. 2. The laser parameter measurement device for experimental teaching according to claim 1, wherein the first right-angle prism (3) can rotate along a first vertical axis, the second right-angle prism (4) can rotate along a second vertical axis, and the first vertical axis is perpendicular to the second vertical axis, and the bottom plate (10) is perpendicular to the second vertical axis.
3. 3. Laser parameter measurement device for experimental teaching according to claim 1 or 2, characterized in that the laser power meter (7) is rotatable in a third vertical axis, which is perpendicular to the base plate (10).
4. 4. The laser parameter measurement device for experimental teaching according to claim 1 or 2, characterized in that the probe of the laser power meter (7) is provided with a detachable front end face, and the center of the detachable front end face is provided with a small hole.
5. 5. The laser parameter measurement device for experimental teaching according to claim 1 or 2, characterized in that the inclined surfaces of the first right-angle prism (3) and the second right-angle prism (4) are coated with an anti-reflection of 400-700 nm, and the two right-angle surfaces are coated with a high reflection of 400-700 nm.
6. 6. Laser parameter measurement device for experimental teaching according to claim 1 or 2, characterized in that the translation stage (8) is moved in rotation by means of a micrometer or controlled by means of a precision stepper motor to achieve automatic operation.
7. 7. The laser parameter measurement device for experimental teaching according to claim 1 or 2, characterized in that: when the laser adjusted by the variable beam expander (2) vertically enters the inclined plane of the first right-angle prism (3), the direction of emergent light rotates 180 degrees relative to the incident direction; When the laser light emitted from the first right angle prism (3) is perpendicularly incident on the inclined surface of the second right angle prism (4), the direction of the emitted light is rotated 180 DEG with respect to the incident direction.

Description

Laser parameter measuring device for experimental teaching Technical Field The invention relates to the technical field of laser teaching instruments, in particular to a laser parameter measuring device for experimental teaching. Background Laser is one of the biggest inventions in the 20 th century, and as people continuously research laser, more and more laser professional talents are required in society. The physical profession, the photoelectric profession and the like of universities are provided with related experiments for measuring laser output parameters, and the size of a base mode light spot, the energy distribution of the base mode light spot and the divergence angle of laser are generally measured. However, the existing experimental instrument has larger error, and particularly when measuring the divergence angle of laser, the distance between the far-field light spot and the light outlet cannot be accurately measured, so that the parameter of the divergence angle of the laser cannot be accurately calculated. Meanwhile, the far-field reflecting mirror is far away from the experiment table, so that the operation of students is very inconvenient, and in the experiment process, the students can only sit on one side of the experiment table for avoiding shielding the light path, and the space is relatively limited. Disclosure of Invention To this end, the present invention provides a laser parameter measurement device for experimental teaching in an effort to solve or at least alleviate at least one of the problems presented above. According to one aspect of the invention, a laser parameter measuring device for experimental teaching is provided, which is characterized by comprising a helium-neon laser, a variable beam expander, a first right-angle prism, a second right-angle prism, a first sliding block, a second sliding block, a first guide rail, a second guide rail, a laser power meter, a translation table, a cushion block, a bottom plate, a first support rod and one or more second support rods, wherein the helium-neon laser is arranged on the bottom plate through the one or more second support rods, the variable beam expander is arranged on the bottom plate through the first support rod and is coaxial with the helium-neon laser, so that laser output by the helium-neon laser is input to the variable beam expander, the first guide rail is arranged in parallel with the second guide rail, the first sliding block is arranged on the first guide rail and can drive the first right-angle prism to axially move along the guide rail on the first guide rail, the second sliding block is arranged on the second guide rail and can drive the second right-angle prism to axially move on the second guide rail, the second sliding block can drive the second right-angle prism to axially move along the guide rail on the second guide rail, the bottom plate is arranged on the second guide rail and is in parallel with the second guide rail, the laser power meter is arranged on the second guide rail, and the laser power meter is arranged on the second sliding block and is in parallel to the second guide rail, and the laser meter is arranged on the second guide rail and has a laser power meter for receiving laser power meter. Further, the first right-angle prism 3 can rotate along a first vertical axial direction, the second right-angle prism 4 can rotate along a second vertical axial direction, and the first vertical axial direction and the second vertical axial direction are perpendicular to the base plate 10. Further, the laser power meter 7 can rotate along a third vertical axis, which is perpendicular to the bottom plate 10. Further, the probe of the laser power meter 7 is provided with a detachable front end face, and a small hole is arranged in the center of the detachable front end face. Further, the coating films on the inclined surfaces of the first right-angle prism 3 and the second right-angle prism 4 are anti-reflection to 400-700 nm, and the coating films on the two right-angle surfaces are high-reflection to 400-700 nm. Further, the translation stage 8 is rotationally moved by a micrometer or controlled by a precision stepper motor to achieve automatic operation. Further, when the laser light adjusted by the variable beam expander 2 is perpendicularly incident on the inclined surface of the first right angle prism 3, the direction of the outgoing light is rotated 180 ° with respect to the incident direction, and when the laser light outgoing from the first right angle prism 3 is perpendicularly incident on the inclined surface of the second right angle prism 4, the direction of the outgoing light is rotated 180 ° with respect to the incident direction. The laser parameter measuring device for experimental teaching has the advantages that at least one of the following advantages that the optical path can be accurately measured by utilizing the guide rail structure with scales, the laser divergence angle can be m