A near-field far-field same screen optical path adjusting system

Abstract

The application relates to a near-field and far-field same-screen optical path adjusting system and relates to the field of optical path calibration. The system comprises an LD, a first 45-degree beam splitter, a second 45-degree beam splitter, a first 45-degree reflector, a second 45-degree reflector, a near-field light shutter and a far-field light shutter. The light beam emitted by the LD is divided into N light beams and P light beams through the first 45-degree beam splitter. The N light beams pass through the first 45-degree beam splitter and then pass through the second 45-degree beam splitter again, reach a light screen position and display near-field light spots on the light screen. The P light beams are reflected by the first 45-degree beam splitter, propagate forward along a direction perpendicular to the optical axis, are folded back under the action of the third 45-degree reflector and the fourth 45-degree reflector, are reflected by the second 45-degree beam splitter and reach the light screen, and far-field light spots are displayed on the light screen. The near-field light shutter and the far-field light shutter are arranged on the route of the N light beams and the P light beams respectively and are used for the on-off of the optical path. The application can save the reciprocating operation time of the light screen and greatly shorten the optical path calibration time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical path calibration, in particular to an optical path adjustment system with near field and far field on the same screen. BACKGROUND

[0002] For visible band semiconductor chips, because the divergence angle is large and has a large range of fluctuations, individual beam collimation is generally required for each LD. The divergence angle of each LD is divided into fast axis and slow axis. The fast axis divergence angle is relatively larger, about 30°~45°; the slow axis divergence angle is relatively smaller, about 5°~15°. This means that each LD needs to be collimated in two directions, the fast axis direction and the slow axis direction. Considering the fluctuation of the divergence angle, two optical lenses are needed in each direction to cooperate with each other to collimate the light beam in that direction to a nearly parallel state.

[0003] In the traditional calibration method, the quality of the light beam is monitored by reciprocating the light screen in the far field and the near field, and then the quality of the light beam is confirmed, as shown in the prior art. Figure 1

[0004] In an ideal state, after installing an optical lens, the light screen reciprocates once at the basic position of the lens; after calibrating the lens, the light screen reciprocates once for confirmation; after fixing the lens with glue, the light screen reciprocates once for confirmation. This is an ideal state, and in actual situations, it is difficult to calibrate in one time, and it is common to reciprocate 3 to 5 times for confirmation. In this way, in fact, at least 5 times of reciprocation of the light screen are required to realize the assembly of an optical lens.

[0005] Each LD needs 4 optical lenses to cooperate with each other to achieve the purpose of beam calibration; and each optical lens needs to be adjusted to the appropriate position and angle, and at least 5 times of reciprocation of the light screen in the far field and the near field is required to confirm the final effect. For example, if the light beams emitted by 12 LDs are to be spatially combined, 48 optical lenses are required to complete the calibration, and during the calibration process, the light screen needs to be reciprocated more than 240 times, which is a very large and time-consuming work. SUMMARY

[0006] The present application aims to design an optical path adjustment system with near field and far field on the same screen, which can save the reciprocation operation time of the light screen and greatly shorten the optical path calibration time.

[0007] ​In order to achieve the above purpose, the application provides a light path adjusting system with near field and far field on the same screen, which produces N and P light path differences through the way of splitting and combining beams, and makes corresponding light spots displayed on the same light screen.

[0008] All the information required for light path calibration is obtained through the shape of the far field and near field light spots; the target of observing and calibrating at the same time can be achieved through the adjustment of the first 45-degree mirror and the second 45-degree mirror; the information of fast-axis divergence, slow-axis contraction, optical axis upward and leftward deflection can be obtained through the light spot appearance, which provides accurate direction for light path calibration.

[0009] Further, a set of calibration lenses are arranged between the LD and the first 45-degree beam splitter for light path collimation.

[0010] Further, the first 45-degree beam splitter and the second 45-degree beam splitter are arranged vertically.

[0011] Further, the first 45-degree mirror and the second 45-degree mirror are arranged vertically.

[0012] Further, through the calibration of optical lenses, if the near field and far field light spot sizes are consistent and completely overlapped on the light screen, it means that the LD beam has been calibrated to a level close to the standard LD light path, and the LD light path calibration is completed.

[0013] The application has the following advantages:

[0014] The application provides a light path adjusting system with near field and far field on the same screen, which realizes the effect of far field and near field light spot display on the same screen through light path design. The light spot display on the same screen can represent the angle inclination of LD light output through the overlapping condition of far field and near field light spots; the size of far field and near field light spots can represent the divergence or contraction condition of the light beam. The application saves the time of moving the light screen back and forth between the far field and the near field, improves the light beam collimation and adjustment efficiency, and avoids the back and forth movement of the light screen to save calibration time. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Structure diagram of prior art;

[0016] Figure 2 Structure diagram of optical path adjustment system of the present application;

[0017] Figure 3 Structure diagram of optical path adjustment system of the present application;

[0018] Figure 4 Structure diagram of optical path adjustment system of the present application;

[0019] Figure 5 Structure diagram of optical path adjustment system of the present application;

[0020] Figure 6 Structure diagram of optical path adjustment system of the present application;

[0021] Figure 7 Structure diagram of optical path adjustment system of the present application;

[0022] Figure 8 Structure diagram of optical path adjustment system of the present application;

[0023] In the figure: 1-LD, 2-first 45-degree beam splitter, 3-second 45-degree beam splitter, 4-first 45-degree mirror, 5-second 45-degree mirror, 6-near field light shutter, 7-far field light shutter, 8 light screen, 9-calibration lens, 10-standard LD optical path system. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned figures are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0026] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0027] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0028] In addition, the terms "mounting", "setting", "provided with", "connected", "connected", "sleeved" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific situation.

[0029] Because the semiconductor chip light emission divergence angle is relatively large, it is necessary to collimate the light beam before spatial beam combining, one is to compress the divergent light beam into an approximately parallel light beam, and the other is to make the light beams and the light beams as parallel as possible. The light beams emitted by each LD1 are formed into parallel light beams that are parallel to each other, which is a prerequisite for spatial beam combining. Referring to Figure 2 The embodiment discloses a light path adjusting system for near field and far field on the same screen, which comprises an LD1, a first 45-degree beam splitter 2, a second 45-degree beam splitter 3, a first 45-degree mirror 4, a second 45-degree mirror 5, a near field light shutter 6 and a far field light shutter 7. The light beam emitted by the LD1 is divided into N light beams and P light beams through the first 45-degree beam splitter 2. The N light beams pass through the first 45-degree beam splitter 2 again, then pass through the second 45-degree beam splitter 3 again, and reach the light screen 8. The near field light spot is displayed on the light screen 8. The P light beams are reflected by the first 45-degree beam splitter 2 and propagate forward along the direction perpendicular to the optical axis. Finally, under the action of the third 45-degree mirror and the fourth 45-degree mirror, the P light beams are folded back, reflected by the second 45-degree beam splitter 3, and finally reach the light screen 8. The far field light spot is displayed on the light screen 8. The near field light shutter 6 and the far field light shutter 7 are arranged on the route of the N light beams and the P light beams respectively, and are used for on-off of the light path.

[0030] The application also includes a set of calibration lenses 9 arranged between the LD1 and the first 45-degree beam splitter 2 for light path collimation.

[0031] Further optimization technical solutions, the first 45-degree beam splitter 2 and the second 45-degree beam splitter 3 are arranged vertically.

[0032] Further optimization technical solutions, the first 45-degree mirror 4 and the second 45-degree mirror 5 are arranged vertically.

[0033] Further optimization technical solutions, all information required for light path calibration is obtained through the shape of the far-field spot and the near-field spot; through the adjustment of the first 45-degree mirror 4 and the second 45-degree mirror 5, the goal of one-side observation and one-side calibration can be achieved; through the spot shape, the information of fast-axis divergence, slow-axis contraction, optical axis upward and leftward deflection can be obtained, which provides accurate direction for light path calibration.

[0034] Further optimization technical solutions, through the calibration of optical lenses, if the near-field / far-field spot size is consistent and completely coincides on the light screen, it means that the LD1 light beam has been calibrated to a level close to the standard LD1 light path, and the LD1 light path calibration is completed. After the overall light path system is built, further light path calibration is needed to ensure the accuracy of the entire light path system. During the calibration process, a set of standard LD light path system 10 that has been calibrated is needed, and the light emitted by the standard LD light path system 10 can be used as a ruler for calibrating the entire light path system. Due to the refraction phenomenon in the N light path transmission process and the problem of the light path system, the N light path and the P light path of the uncalibrated light path system are highly likely to be unable to display coaxially on the light screen. At this time, the positions of the first 45-degree mirror and the second 45-degree mirror can be adjusted to achieve the purpose of calibration. When the light beam emitted by the standard light path system realizes the coincidence of the far-field spot and the near-field spot on the light screen, it means that the calibration is completed. The light path system calibration is as shown in Figure 3 .

[0035] During the use of the light path system, since the far-field spot and the near-field spot are displayed on the same screen, how to distinguish the far-field spot and the near-field spot is the first problem to be solved. At this time, using a near-field light shutter or a far-field light shutter can be easily realized. Closing the near-field light shutter, the disappeared spot is the near-field spot, and the far-field is the same.

[0036] Through the size comparison of the far-field spot and the near-field spot, the conclusion of spot divergence or contraction can be obviously obtained. When the far-field spot size is larger than the near-field spot, it is divergence; when the far-field spot size is smaller than the near-field spot, it is contraction. In actual use, due to the distinction between fast-axis and slow-axis, the light beam is divided into fast-axis divergence / contraction and slow-axis divergence / contraction, corresponding to four different spot shape characteristics. The four situations corresponding to the states are as shown in Figure 4 .

[0037] For LD beam calibration, in addition to the spot calibration problem, there is also the problem of correcting the optical axis deflection. The correction of the optical axis deflection can also be achieved through the optical system. After the optical system calibration, when the far point spot and the near point spot center positions cannot overlap, it means that the LD has the problem of optical axis deflection. It needs to be analyzed separately in the left and right directions and the up and down directions.

[0038] When the LD has optical axis deflection in the up and down directions, the far field is more affected by the deflection angle, and the displacement of the spot is more obvious. Therefore, when the far field spot is higher than the near field spot, it means that the optical axis is upwardly deflected; when the far field spot is lower than the near field spot, it means that the optical axis is downwardly deflected. The corresponding relationship is as shown in Figure 5 .

[0039] For the left and right direction deflection, the situation is more complicated due to the reflection of the light beam. For N light beams, since it is transmitted throughout, it is basically not affected by the optical path, and if the LD optical axis is deflected to the left, the spot will be displaced to the left, which is a clear corresponding relationship. For P light beams, due to the influence of multiple reflections, it actually shows the characteristics opposite to the deflection direction of the LD optical axis, that is, if the LD optical axis is deflected to the left, the spot will be displaced to the right. The effect of the left and right deflection of the LD optical axis is as shown in Figure 6 .

[0040] When the LD has optical axis deflection in the left and right directions, the near field spot is positively displaced, and the far field spot is negatively displaced. Therefore, when the near field spot is located to the left of the far field spot, it means that the optical axis is deflected to the left; when the near field spot is located to the right of the far field spot, it means that the optical axis is deflected to the right. The corresponding relationship is as shown in Figure 7 .

[0041] Through the above rules, all the information required for optical path calibration can be obtained through the morphology of the far field spot and the near field spot. Through the adjustment of the optical lens, the goal of one-side observation and one-side calibration can be achieved. Taking the example shown in Figure 8 , through the spot morphology, the information of fast axis divergence, slow axis contraction, optical axis upward and leftward deflection can be obtained, which provides accurate direction for optical path calibration.

[0042] Through the calibration of the optical lens, the near field / far field spot size is consistent and completely coincides on the light screen, which means that the LD light beam has been calibrated to a level close to the standard LD optical path, and the LD optical path calibration is completed. Compared with the method of observing the spot change through the light screen back and forth, the corresponding effect of the spot displayed on the same screen is more intuitive, which is more conducive to the fine adjustment of the optical path.

[0043] The application provides a light path adjusting system for near field and far field display on the same screen. Through light path design, the effect of far field and near field light spot display on the same screen is realized. The light spot display on the same screen can represent the angle inclination of LD light emission through the overlapping condition of far field and near field light spot; the divergence or contraction condition of the light beam can be represented through the size of far field and near field light spot. The application saves the time of moving the light screen back and forth between the far field and the near field, improves the light beam collimation adjusting efficiency, avoids the reciprocating movement of the light screen and saves the calibration time. According to the data statistics, the light path calibration time of 12 LDs can be shortened from 6h to 2h, only 1 / 3 of the original time. Taking a 1KW semiconductor laser as an example, 240 LDs are basically needed for light path calibration, and the light path calibration time of the application is shortened from 120h to 40h, saving 80h of working hours.

[0044] The above is only the preferred embodiment of the application, and does not limit the technical scope of the application in any way. Any slight modification, equivalent change and modification of the above embodiment according to the technical essence of the application still belongs to the technical solution of the application.

Claims

1. A near field and far field on-screen optical path adjustment system, characterized in that, Comprise: LD, first 45-degree beam splitter, second 45-degree beam splitter, first 45-degree mirror, second 45-degree mirror, near-field light shutter and far-field light shutter; the light beam emitted by the LD is divided into N light beam and P light beam through the first 45-degree beam splitter; the N light beam transmits through the first 45-degree beam splitter again, and then transmits through the second 45-degree beam splitter to reach the light screen position, and the near-field light spot is displayed on the light screen; the P light beam is reflected by the first 45-degree beam splitter and propagates forward along the direction perpendicular to the optical axis, and finally is folded back by the third 45-degree mirror and the fourth 45-degree mirror, is reflected by the second 45-degree beam splitter, and finally reaches the light screen, and the far-field light spot is displayed on the light screen; the near-field light shutter and the far-field light shutter are respectively arranged on the route of the N light beam and the P light beam, and are used for on-off of the optical path; All information required for optical path calibration is obtained through the shape of the far-field light spot and the near-field light spot; through the adjustment of the first 45-degree mirror and the second 45-degree mirror, the goal of observing and calibrating at the same time can be realized; through the light spot shape, the information of fast-axis divergence, slow-axis contraction, optical axis upward and leftward deflection can be obtained, and accurate direction is provided for optical path calibration.

2. The optical path adjustment system for near-field and far-field on-screen according to claim 1, wherein, Further comprise a set of calibration lenses, which are arranged between the LD and the first 45-degree beam splitter, and are used for optical path collimation.

3. The optical path adjustment system for near-field and far-field on-screen according to claim 2, wherein, The first 45-degree beam splitter and the second 45-degree beam splitter are vertically arranged.

4. The optical path adjustment system for near-field and far-field on-screen according to claim 3, wherein, The first 45-degree mirror and the second 45-degree mirror are vertically arranged.

5. The optical path adjustment system for near-field and far-field on-screen according to claim 4, wherein, Through the calibration of the optical lenses, when the near-field / far-field light spot size is consistent and completely coincides on the light screen, it is indicated that the LD light beam has been calibrated to the level close to the LD standard light path, and the LD optical path calibration is completed.

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