Convenient auxiliary system for optical path adjustment in time-resolved spectroscopy detection systems

Abstract

The present invention relates to the field of optical experimental equipment, and specifically to a convenient auxiliary system for adjusting the optical path for a time-resolved spectral detection system, which plays a role in conveniently adjusting the optical path and achieving time matching in the time-resolved detection system. The system includes a light entry stopper, a height adjustment gasket, light-passing pipes of different heights, a 90-degree reflective black box, a bearing base and a base fixture, and is characterized in that the whole set of equipment is installed on a high-precision optical platform, and the light beam enters the system through the light entry stopper, and then passes through an extension channel composed of a light-passing pipe and a reflective black box, and finally leaves the system with a customized path, height and direction. The invention meets the needs of quickly adjusting the extended optical path, convenient installation and use, and reducing optical path disturbances, and brings great convenience to the optical path design of time-resolved spectral experiments.

Description

Technical Field

[0001] The present invention relates to the field of optical experimental equipment, and plays a role in conveniently adjusting the optical path and realizing time matching in a time-resolved spectrum detection system. Background Art

[0002] Time-Resolved Spectroscopy is an advanced optical experimental technique used to study various dynamic processes of matter in ultra-short time scales (picosecond or femtosecond order). Its basic principle is to precisely control the temporal behavior of light to measure the reaction or change of matter at different time points, especially ultrafast optical phenomena in a very short time. This type of detection technology usually uses a pump light and a probe light to act on the research object at the same time. Only when the time difference between the two light pulses reaching the research object meets a certain relationship can the generation of the signal be observed.

[0003] Nowadays, most of the detection systems based on this technology belong to non-standardized experiments, and there is no unified standard and method for the design of the optical path. Therefore, how to match the time difference between the pump light and the detection light, that is, the optical path difference, becomes a key to the design of the detection optical path. At present, the common method is to directly extend a certain beam of light in the redundant space of the optical platform, or use cage-based devices for more standardized adjustments, and may also introduce optical devices such as optical periscopes to utilize the space in the vertical direction.

[0004] Although the principles of existing processing methods are intuitive and easy to understand, they are still not easy to operate when facing actual optical experimental problems. The two beams of light in the time-resolved detection system usually need to be modulated by multiple optical components, which occupies a large area of ​​the optical platform and does not often leave free space; although the optical path under the cage structure has the advantages of high integration and anti-interference, it is very inconvenient to use in the time-resolved detection optical path that needs to consider a longer optical path; the installation and calibration of components such as optical periscopes are relatively complicated. Once the optical path is changed due to experimental requirements, a longer process of optical path recovery operation is required. At present, there is still a lack of an optical system that can simplify the optical path matching problem and increase the degree of freedom in design. Summary of the invention

[0005] In view of the above problems, the present invention proposes a convenient auxiliary system for adjusting the optical path length of a time-resolved spectral detection system.

[0006] The present invention is achieved through the following technical solutions: The system comprises (1) a light entry stopper, (2) a height adjustment gasket, (3) light pipes of different heights, (4) a 90-degree reflective black box, (5) a supporting base, and (6) a base fixture. The system is characterized in that the entire set of equipment is installed on a high-precision optical platform by means of (2), (5) and (6). The light beam enters the system through (1) the light entry stopper, then passes through an extended channel composed of (3) and (4), and finally leaves the system with a customized path, height and direction, so that the light beam passes through a sufficiently long optical path without affecting the quality of the light spot, and fully utilizes the vertical space of the test area without being limited by the area of ​​the optical platform.

[0007] The above-mentioned convenient auxiliary system for optical path adjustment of time-resolved spectral detection system uses inserted limiting hole columns to connect the various structures, that is, the convex column of a certain structure is inserted into the concave hole of another structure for simple splicing and fixation, limiting it to reflect the light beam in the standard 90° direction.

[0008] The above-mentioned (1) light entry stopper is characterized in that its shape is a cube with a convex column and a concave hole, and a small hole aperture is installed at the incident and exit ports, and a plane reflector is built in to limit and adjust the direction and position of the light beam to ensure that the light beam enters the optical path adjustment range at the correct angle.

[0009] The above-mentioned (4) right-angle reflection black box is characterized in that its appearance is a cube with convex columns and concave holes, and both the incident and exit ports have light holes, and a plane reflector is built in to perform standard right-angle reflection on the light beam passing through the (1) light input limiter to ensure that the light spot quality is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The schematic diagram of the structure of (5) the bearing base (right) and (6) the base fixture (left). 1 is the groove structure for locking the fixture with the optical platform, 2 and 3 are the connecting convex columns and concave holes between the base and the fixture, 4 is the bearing main body bottom plate, and 5 is the fixing convex column connected to (1) the light stopper and (4) the 90-degree reflection black box.

[0011] Figure 2 This is a schematic diagram of the base assembly. Any path can be spliced ​​according to different optical path design requirements.

[0012] Figure 3 Schematic diagram of the structure of (1) the light entry limiter, wherein 1 is the cubic shell frame of the main body, 2 and 3 are connecting convex columns and concave holes, 4 is a small hole diaphragm, 5 is a fixed concave hole connected to (5) the supporting base, and 6 is a built-in plane reflector.

[0013] Figure 4(4) is a schematic diagram of the structure of the 90-degree reflective black box, which is basically the same as the structure of the light-entry stopper (1), except that 4 is a light-through hole.

[0014] Figure 5 (3) are light pipes of different heights, 1 is the enclosed light channel on all sides of the main body, 2 and 3 are connecting convex columns and concave holes. Assume that the height of the shortest pipe is h, then the heights of the connecting structures of other heights are all integer multiples of h.

[0015] Figure 6 Schematic diagram of the optical path of the coplanar arrangement system. DETAILED DESCRIPTION

[0016] The working principle and application method of the present invention are further described below in conjunction with the accompanying drawings.

[0017] Before installation, determine the number and position of (5) the required support bases according to the optical path required by the experimental design, such as Figure 1 Insert and splice as shown, and adjust the overall position after the assembly is completed. Figure 2 As shown, the incident light passes through the center of the side length of the first base in a roughly vertical direction, and then the base fixture (6) is used to fix it at both ends or any end of the overall structure. After that, the optical path of the system will be limited to the area laid by the base, and there is no need for complicated disassembly and assembly when adjusting the optical path extension distance. There is no fixed requirement for the splicing method of the base. The position and direction of the incident light and the outgoing light can be determined according to the experimental needs, and they can pass through any path.

[0018] The incident light needs to be collimated in the first step to ensure that the light beam is completely perpendicular to the ground and then enters the extension section. Assemble (1) the light stopper and (5) the fixed base through the hole column connection structure, and then adjust the position and direction of the incident light. Figure 3 The side view of the internal structure of the (1) light entry stopper shown in the figure, assumes that the center points of the 4 small apertures are A and C respectively, the center of the 6 plane reflectors is point B, and the 6 plane reflectors are at an angle of 45° to the ground, then the line AB is parallel to the ground, the line BC is perpendicular to the ground, and ABC forms a plane. According to the principles of geometric optics, if and only if the incident light is coaxial with the line AB, the light beam can be emitted in a direction coaxial with BC, completing the effect of introducing the incident light into the system and collimating it. After installing the (1) light entry stopper, the user uses the double aperture collimation method to adjust the incident light. After the calibration is completed, the above effect can be achieved.

[0019] (1) Light limiter and Figure 4 The (4) 90-degree reflective black boxes shown are all cubic in design and have the characteristic of 90-degree rotational symmetry. Therefore, according to experimental requirements, the optical path of the extension system can be changed in various directions and is not limited to being distributed in the same plane.

[0020] Figure 6 The figure shows the simplest example of an optical path arrangement, that is, a schematic diagram of an optical path in which all optical paths are arranged coplanarly in one plane. The incident light enters the system from (1) the light stopper and passes through Figure 5 The (5) light pipes of different heights shown are then switched by two (4) 90-degree reflective black boxes, and this cycle repeats until the laser passes through the entire extension section and is emitted from the last (4) 90-degree reflective black box. Once the initial calibration is correct, all reflections in the system remain at right angles, ensuring the quality of the light spot. After the light pipes are correctly connected, the entire system has good sealing properties and can largely isolate disturbances such as dust and airflow. According to the optical path principle, assuming that the side length of the (4) 90-degree reflective black boxes is a, the number of used boxes is x, and the total length of the (5) light pipes is H, then the optical path y extended by the system is:

[0021] When the optical path needs to be adjusted, it is only necessary to remove the two (4) 90-degree reflective black boxes connected at the top at the same time, and replace the length of the corresponding light-passing pipe as needed to quickly complete the optical path change without repeated disassembly, installation and calibration operations, while avoiding disturbances to the entire detection system.

Claims

1. A convenient auxiliary system for adjusting the optical path length of a time-resolved spectral detection system, comprising (1) a light entry stopper, (2) a height adjustment gasket, (3) light passages of different heights, (4) a 90-degree reflective black box, (5) a bearing base, and (6) a base fixture, wherein the system comprises: The entire set of equipment is installed on a high-precision optical platform with the help of (2), (5) and (6). The light beam enters the system through the light stopper (1), then passes through the extended channel composed of (3) and (4), and finally leaves the system with a customized path, height and direction. This allows the light beam to pass through a sufficiently long optical path without affecting the quality of the light spot, and fully utilizes the vertical space of the test area without being limited by the area of ​​the optical platform.

2. As claimed in claim 1, the convenient auxiliary system for optical path adjustment for time-resolved spectral detection system, the connection between its various structures is connected by inserting type limiting hole columns, that is, the convex column of a certain structure is inserted into the concave hole of another structure for simple splicing and fixation, limiting it to reflect the light beam only in the standard 90° direction.

3. The light entry stopper as claimed in claim 1, characterized in that The shape is a cube with convex columns and concave holes. A small aperture is installed at the incident and exit ports, and a plane reflector is built in to limit and adjust the direction and position of the light beam to ensure that the light beam enters the optical path adjustment range at the correct angle.

4. The right-angle reflective black box as described in claim 1, characterized in that The shape is a cube with convex columns and concave holes. There are light holes at the incident and exit ports. A plane reflector is built in to perform standard right-angle reflection on the light beam passing through the (1) light limiter to ensure that the light spot quality is not affected.

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