Laser pointing compensation system and compensation method

Abstract

A laser pointing compensation system provided by the present invention comprises a laser, a pointing test platform and a temperature and humidity box, the laser is arranged on the pointing test platform, the pointing test platform is placed in the temperature and humidity box, and when the temperature and humidity box changes the environment temperature in the temperature and humidity box, the pointing test platform is placed in the temperature and humidity box. And the pointing test platform tests to obtain the original pointing variation of the laser along with the ambient temperature, and adjusts a pointing compensation device arranged at the light outlet of the laser according to the original pointing variation. The invention further provides a compensation method adopting the laser pointing compensation system. The laser pointing compensation system is simplified in structure, smaller in occupied space and lower in cost; according to the laser pointing compensation system, each laser can be independently debugged and optimized, the lasers of the same kind can be customized and imported in batches, and the matching performance is better; according to the laser pointing compensation method, laser pointing compensation can be quickly and accurately realized, and the operation is quick and convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of lasers, and more precisely, to a laser beam pointing compensation system and a compensation method. Background Art

[0002] The pointing accuracy of a light beam is an important factor affecting the performance of an optical system. The main factors causing the light beam pointing deviation are various external interferences, such as temperature changes, thermal effects, mechanical vibrations, stress changes, etc. Among them, interferences such as mechanical vibrations and stress changes are generally solved by platform vibration damping structures and improvements in their own structures, while thermal effects and temperature changes require corresponding pointing stabilization systems to solve.

[0003] In the prior art, the uAligna active laser beam pointing stabilization system of TEM Company in Germany is a system for adjusting the laser beam directivity. The system consists of two fast steering mirrors (FSMs), a position detector (PSD), and a control chassis. The deflection of the FSM is achieved by combining an electric motor and a piezoelectric ceramic, which can simultaneously ensure a large range and high precision of the fast steering mirror. With a high-resolution position detector (PSD), the overall accuracy of the system can reach the sub-micron level. The system mainly uses a double-mirror optical path in combination with a control motor and PSD pointing detection feedback to actively and automatically achieve the correction and debugging of the pointing, so as to improve the pointing stability. The disadvantage of the above uAligna system is that the deployed optical path system is relatively large in volume and the overall cost is relatively high.

[0004] In summary, there is a need in the art for a laser beam pointing compensation system with a more simplified structure, less space occupation, and lower cost, as well as a corresponding compensation method. Summary of the Invention

[0005] In view of this, an object of the present invention is to provide a laser beam pointing compensation system, which uses a pointing test platform and a temperature and humidity chamber to obtain the variation of the laser beam directivity with the ambient temperature, and uses a pointing compensation device to compensate for the influence of the ambient temperature on the directivity.

[0006] Another object of the present invention is to provide a laser beam pointing compensation method, which uses the above-mentioned laser beam pointing compensation system to compensate for the influence of the ambient temperature on the laser beam directivity.

[0007] To achieve the above object, the present invention provides a laser pointing compensation system, including a laser, a pointing test platform and a temperature and humidity chamber. The laser is disposed on the pointing test platform, and the pointing test platform is placed inside the temperature and humidity chamber. When the temperature and humidity chamber changes the ambient temperature inside it, the pointing test platform measures the original pointing change amount of the laser with respect to the ambient temperature, and adjusts the pointing compensation device disposed at the light exit of the laser according to the original pointing change amount.

[0008] Preferably, the pointing test platform includes a focusing lens and a position sensitive sensor, and the outgoing light of the laser reaches the position sensitive sensor through the focusing lens.

[0009] Preferably, the pointing compensation device includes a mirror mount. The middle of the mirror mount has a through circular hole, and a rotation adjustable guide rail is installed around the circular hole. A support column is slidably installed on the rotation adjustable guide rail, and a lens is integrally installed on the support column, and the lens is located inside the circular hole. The lens has a laser beam incident portion, and the laser beam emitted by the laser enters the lens from the laser beam incident portion.

[0010] Preferably, the specific adjustment parameters of the pointing compensation device 2 are calculated according to the following formula:

[0011]

[0012] Where, Δ is the original pointing change amount of the laser 1, F is the focal length of the focusing lens 3, α is the thermal expansion coefficient of the support column 22, L is the length of the support column 22, ΔT is the ambient temperature change amount, and f is the focal length of the lens 23.

[0013] Preferably, the ambient temperature change range inside the temperature and humidity chamber is 15~35°C.

[0014] The present invention provides a laser pointing compensation method, using the laser compensation system, including the steps of:

[0015] (A) Place the laser on the pointing test platform;

[0016] (B) Place the pointing test platform with the laser placed on it inside the temperature and humidity chamber, and control the temperature and humidity chamber to change the temperature, and obtain the original pointing change amount of the laser with respect to the ambient temperature through the pointing test platform;

[0017] (C) Set a pointing compensation device at the light exit position of the laser, and adjust the pointing compensation device according to the original pointing change amount to compensate for the pointing change caused by the ambient temperature change.

[0018] Preferably, step (A) specifically includes: the laser and the position-sensitive sensor are respectively placed on both sides of the focusing lens, and the position-sensitive sensor is located at the focal plane position of the focusing lens.

[0019] Compared with the prior art, the advantages of a laser pointing compensation system and a compensation method disclosed by the present invention are as follows: the structure of the laser pointing compensation system is simplified, the occupied space is smaller, and the cost is lower; the laser pointing compensation system can be individually debugged and optimized for each laser, and can also be batch-customized and imported for the same type of lasers, with better matching; the laser pointing compensation method can quickly and accurately compensate the laser pointing, and the operation is fast and convenient. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 The following shows a schematic structural diagram of a laser pointing compensation system of the present application.

[0022] Figure 2 The following shows a schematic structural diagram of a pointing compensation device of a laser pointing compensation system of the present application. Detailed Embodiments

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0024] As Figure 1 shown, a laser pointing compensation system of the present application includes a laser 1, a pointing test platform, and a temperature and humidity chamber 5. The laser 1 is arranged on the pointing test platform, and the pointing test platform is placed inside the temperature and humidity chamber 5. When the temperature and humidity chamber 5 changes the internal environmental temperature, the pointing test platform tests the original pointing change amount of the laser 1 with the change of the environmental temperature, and adjusts the pointing compensation device 2 arranged at the light outlet of the laser 1 according to the original pointing change amount to achieve the compensation of the laser 1 pointing.

[0025] The laser pointing compensation system has a simplified structure, occupies less space, and has a lower cost; the laser pointing compensation system can be individually debugged and optimized for each laser, or can be batch-customized and imported for the same type of lasers, with better matching performance.

[0026] Specifically, the pointing test platform includes a focusing lens 3 and a position sensitive sensor 4. The emitted light of the laser 1 reaches the position sensitive sensor 4 through the focusing lens 3, and the pointing offset of the laser 1 is obtained through testing by the position sensitive sensor 4.

[0027] Preferably, the ambient temperature change range inside the temperature and humidity chamber 5 is 15 - 35 °C.

[0028] See Figure 2 , the pointing compensation device 2 includes a mirror mount 20. The middle part of the mirror mount 20 has a through-round hole. A rotary adjustable guide rail 21 is installed around the round hole, and a support column 22 is slidably installed on the rotary adjustable guide rail 21. A lens 23 is integrally installed on the support column 22, and the lens 23 is located inside the round hole. The lens 23 has a laser beam incident part 231. The laser beam emitted by the laser 1 is incident on the lens 23 from the laser beam incident part 231. By rotating the support column 22, the emission angle of the laser beam can be adjusted to achieve the purpose of compensation.

[0029] The specific adjustment parameters of the pointing compensation device 2 are calculated according to the following formula:

[0030]

[0031] Where, Δ is the original pointing change amount of the laser 1, F is the focal length of the focusing lens 3, α is the thermal expansion coefficient of the support column 22, L is the length of the support column 22, ΔT is the ambient temperature change amount, and f is the focal length of the lens 23.

[0032] This application also provides a laser pointing compensation method. Using the laser compensation system, it includes the steps of:

[0033] (A) Place the laser on the pointing test platform;

[0034] (B) Place the pointing test platform with the laser placed on it inside the temperature and humidity chamber, and control the temperature and humidity chamber to change the temperature. Obtain the original pointing change amount of the laser with respect to the ambient temperature through the pointing test platform;

[0035] (C) Set a pointing compensation device at the light output port position of the laser, and adjust the pointing compensation device according to the original pointing change amount to compensate for the pointing change caused by the ambient temperature change.

[0036] Among them, step (A) specifically includes: the laser and the position sensitive sensor are respectively placed on both sides of the focusing lens, and the position sensitive sensor is located at the focal plane position of the focusing lens.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser pointing compensation system, characterized in that: It includes a laser, a pointing test platform and a temperature and humidity chamber. The laser is arranged on the pointing test platform, and the pointing test platform is placed inside the temperature and humidity chamber. When the temperature and humidity chamber changes the ambient temperature inside it, the pointing test platform tests the original pointing change amount of the laser with the ambient temperature, and adjusts the pointing compensation device arranged at the light outlet of the laser according to the original pointing change amount.

2. The laser pointing compensation system according to claim 1, characterized in that, The pointing test platform includes a focusing lens and a position sensitive sensor, and the emitted light of the laser reaches the position sensitive sensor through the focusing lens.

3. The laser pointing compensation system according to claim 2, wherein The pointing compensation device includes a mirror mount. The middle of the mirror mount has a through circular hole, and a rotation adjustable guide rail is installed around the circular hole. A support column is slidably installed on the rotation adjustable guide rail, a lens is integrally installed on the support column, and the lens is located inside the circular hole. The lens has a laser beam incident part, and the laser beam emitted by the laser enters the lens from the laser beam incident part.

4. The laser pointing compensation system according to claim 3, wherein: The specific adjustment parameters of the pointing compensation device 2 are calculated according to the following formula: Where, Δ is the original pointing change amount of the laser 1, F is the focal length of the focusing lens 3, α is the thermal expansion coefficient of the support column 22, L is the length of the support column 22, ΔT is the ambient temperature change amount, and f is the focal length of the lens 23.

5. The laser pointing compensation system according to claim 1, wherein: The ambient temperature change range inside the temperature and humidity chamber is 15 - 35 °C.

6. A laser pointing compensation method, characterized in that, Using the laser compensation system includes the steps of: (A) Place the laser on the pointing test platform; (B) Place the pointing test platform with the laser placed on it inside the temperature and humidity chamber, and control the temperature and humidity chamber to change the temperature, and obtain the original pointing change amount of the laser with the ambient temperature through the pointing test platform; (C) Set the pointing compensation device at the light outlet position of the laser, and adjust the pointing compensation device according to the original pointing change amount to compensate for the pointing change caused by the ambient temperature change.

7. The laser pointing compensation method according to claim 6, characterized in that, The specific content of step (A) includes: the laser and the position sensitive sensor are respectively placed on both sides of the focusing lens, and the position sensitive sensor is located at the focal plane position of the focusing lens.

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