Vacuum temperature measuring collimating sleeve

Abstract

The present application relates to the technical field of laser, in particular to a kind of vacuum temperature measurement collimating sleeve, including collimating cylinder, laser diode and temperature measurement probe;Collimating cylinder is equipped with through hole and temperature measurement hole;Through hole is equipped with limit stop ring, limit stop ring is fixedly connected with through hole, and laser diode is clamped in limit stop ring;Temperature measurement hole extends from the circumferential wall of collimating cylinder to limit stop ring;Temperature measurement probe is clamped in temperature measurement hole, and the temperature measurement head of temperature measurement probe is adjacent to the direction of limit stop ring, temperature measurement probe is used to detect the temperature of laser diode, after temperature measurement hole extends to limit stop ring, temperature measurement probe in temperature measurement hole can directly detect the limit stop ring of clamped laser diode, so that the thermal resistance of temperature measurement probe and laser diode piece is greatly reduced, further increase the precision of measuring laser diode.

Description

Technical Field

[0001] This invention relates to the field of laser technology, and in particular to a vacuum temperature measurement collimating sleeve. Background Technology

[0002] Temperature measurement of lasers in a vacuum is often achieved by measuring the internal structure of the laser and taking the temperature of the internal structure as the temperature of the laser diode. However, the temperature of the internal structure of the laser does not actually represent the temperature of the laser diode. In laser principles, the temperature of the semiconductor laser diode affects the cavity length of the resonant cavity inside the semiconductor laser diode, which in turn changes the standing wave frequency that can exist inside. This affects the longitudinal mode output of the laser diode. Therefore, in industrial and daily production, we hope to obtain a more accurate temperature of the laser diode to clarify its universal relationship with frequency.

[0003] However, existing laser collimation sleeves often employ a composite structure. This means the laser diode is placed on a collimating metal, and then connected to the laser base via an electroplated surface treatment layer or other surface treatment layers, or several layers of metal structure. The laser base is then temperature-measured by a temperature measuring device to determine the laser diode's temperature. However, each of these components has thermal resistance during heat transfer, and in a vacuum, as air is removed, the contact area between each layer decreases sharply, leading to an increase in the thermal resistance limit. This causes the final measured temperature to differ from the laser diode's temperature, making it impossible to approximate the relationship between the laser temperature and the laser output. This has little impact at room temperature, but in a vacuum, heat transfer drops to less than 10% of that in a laboratory environment, resulting in a significant difference between the measured laser diode temperature and the actual temperature.

[0004] Therefore, it is of great significance to study a collimating sleeve that can accurately measure the temperature of a laser diode under vacuum. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum temperature measurement collimating sleeve to solve the problem that existing technologies cannot accurately measure the temperature of laser diodes.

[0006] To address the aforementioned technical problems, this invention provides a vacuum temperature measurement collimating sleeve, comprising a collimating cylinder, a laser diode, and a temperature measuring probe. The collimating cylinder has a through hole and a temperature measuring hole. A limiting ring is fitted inside the through hole and is fixedly connected to the through hole. The laser diode is secured within the limiting ring. The temperature measuring hole extends from the peripheral wall of the collimating cylinder into the limiting ring. The temperature measuring probe is secured within the temperature measuring hole, with its measuring head facing towards the adjacent limiting ring. The temperature measuring probe is used to detect the temperature of the laser diode. After the temperature measuring hole extends into the limiting ring, the temperature measuring probe within the temperature measuring hole can directly detect the limiting ring securing the laser diode. Furthermore, the use of thermally conductive silicone grease significantly reduces the thermal resistance between the temperature measuring probe and the laser diode, further increasing the accuracy of laser diode measurement.

[0007] In one embodiment, the temperature measuring hole and the hole of the limiting ring are isolated from each other to form a hole wall. The design of the hole wall can prevent the laser diode from shaking after it is fixed.

[0008] In one embodiment, along the axial direction of the temperature measuring hole, the temperature measuring section of the temperature measuring hole at least covers the mounting hole of the limiting ring. After the temperature measuring section at least covers the mounting hole, the temperature probe is closer to the position of the limiting ring, and the measurement accuracy is higher.

[0009] In one embodiment, along the axial direction of the temperature measuring hole, the temperature measuring section of the temperature measuring hole completely covers the mounting hole of the limiting ring. After the temperature measuring section completely covers the mounting hole, the temperature measuring probe can capture the temperature change of the laser diode more accurately, resulting in higher measurement accuracy.

[0010] In one embodiment, the temperature measuring hole is sealed and bonded to the temperature measuring probe, which can effectively prevent the temperature measuring probe from moving.

[0011] In one embodiment, the opening end of the temperature measuring hole is sealed to the end of the temperature measuring probe by silicone rubber, and thermally conductive silicone grease is filled between the inner wall of the temperature measuring hole and the temperature measuring probe. The silicone rubber prevents the thermally conductive silicone grease from vaporizing in a vacuum environment. The thermally conductive silicone can effectively conduct the heat emitted by the laser diode to the temperature measuring probe.

[0012] In one embodiment, the limiting ring includes a narrow segment; the laser diode is fixedly sleeved within the narrow segment, and the narrow segment is used to keep the axis of the laser diode stable. The stable laser diode fixing method can keep it collimated when emitting light.

[0013] In one embodiment, the limiting ring further includes a first wide section and a second wide section; along the light emission direction, the second wide section, the narrow section and the first wide section are fixedly connected in sequence.

[0014] The beneficial effects of this invention are as follows:

[0015] Because the collimating cylinder is equipped with a limiting ring for securing the laser diode, and the temperature measuring hole on the collimating cylinder extends from the peripheral wall into the limiting ring, with the temperature probe secured inside the temperature measuring hole, the temperature probe can measure the temperature of the laser diode through the limiting ring during application. This avoids the problem of needing to measure through multiple thermal resistances as in existing technologies, making the temperature measurement of the laser diode more accurate. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic cross-sectional view of the overall structure provided by a preferred embodiment of the present invention;

[0018] Figure 2 This is a front view of the overall structure provided by a preferred embodiment of the present invention;

[0019] Figure 3 This is a rear view of the overall structure provided by a preferred embodiment of the present invention;

[0020] Figure 4 This is a side view of the overall structure provided by a preferred embodiment of the present invention;

[0021] Figure 5 This is a cross-sectional view of a partial structure provided by a preferred embodiment of the present invention. Figure 1 ;

[0022] Figure 6 This is a cross-sectional view of a partial structure provided by a preferred embodiment of the present invention. Figure 2 ;

[0023] Figure 7 This is a cross-sectional view of a partial structure provided by a preferred embodiment of the present invention. Figure 3 ;

[0024] Figure 8 This is a schematic diagram of the collimating cylinder provided in a preferred embodiment of the present invention. Figure 1 ;

[0025] Figure 9This is a schematic diagram of the collimating cylinder provided in a preferred embodiment of the present invention. Figure 2 .

[0026] The attached figures are labeled as follows:

[0027] 1. Collimation cylinder; 10. Through hole; 11. Temperature measuring hole; 12. Limiting ring; 120. Narrow section; 121. First wide section; 122. Second wide section;

[0028] 2. Laser diode;

[0029] 3. Temperature probe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] In existing technologies, laser collimation structures are all non-integrated, meaning that the laser diode is separated from the temperature probe by several metal parts. For example, the laser diode is placed on an aluminum block, then on a sleeve, then on the laser base, and finally on the laser base connected to a temperature probe. This results in very high contact thermal resistance, and the measured temperature is not accurate and differs greatly from the actual temperature.

[0032] To address the aforementioned problems, this application provides a vacuum temperature measurement collimating sleeve, such as... Figures 1 to 9 As shown, the device includes a collimating cylinder 1, a laser diode 2, and a temperature probe 3. The collimating cylinder 1 has a through hole 10 and a temperature measuring hole 11. A limiting ring 12 is fitted inside the through hole 10 and is fixedly connected to the through hole 10. The laser diode 2 is mounted inside the limiting ring 12. The temperature measuring hole 11 extends from the peripheral wall of the collimating cylinder 1 into the limiting ring 12. The temperature probe 3 is mounted inside the temperature measuring hole 11, with its measuring head facing the adjacent limiting ring 12. The temperature probe 3 is used for... To detect the temperature of the laser diode 2, the temperature measuring hole 11 extends into the limiting ring 12. The temperature measuring probe 3 inside the temperature measuring hole 11 can directly detect the limiting ring 12 that holds the laser diode 2, which greatly reduces the thermal resistance between the temperature measuring probe 3 and the laser diode 2, further increasing the accuracy of measuring the laser diode 2. The core idea is to open the temperature measuring hole 11 on the limiting ring 12 that fixes the laser diode 2, and achieve accurate measurement of the temperature of the laser diode 2 through direct measurement by the temperature measuring probe 3.

[0033] In some embodiments of this application, please refer to Figure 9 The temperature measuring hole 11 and the hole of the limiting ring 12 are isolated from each other to form a hole wall. With this setting, the hole wall design can prevent the temperature measuring hole 11 and the hole of the limiting ring 12 from penetrating each other. This allows for temperature measurement of the laser diode 2 while preventing it from shaking after being fixed.

[0034] In some embodiments of this application, please refer to Figure 8 The limiting ring 12 includes a narrow section 120; the laser diode 2 is fixedly sleeved in the narrow section 120. The narrow section 120 is used to keep the axis of the laser diode 2 stable. With this setting, the laser diode 2 is fixed in a stable way so that it can remain collimated when emitting light.

[0035] Specifically, a temperature measuring hole 11 extending from the cylindrical body is provided on the peripheral wall of the limiting ring 12. The limiting ring 12 is also provided with a first wide section 121 and a second wide section 122. Along the light emission direction, the second wide section 122, the narrow section 120 and the first wide section 121 are fixedly connected in sequence. With this setting, the laser diode 2 can be fixedly installed in the limiting ring 12.

[0036] In some embodiments of this application, please refer to Figure 1 and Figure 9 Along the axial direction of the temperature measuring hole 11, the temperature measuring section of the temperature measuring hole 11 at least covers the mounting hole of the limit ring 12. With this setting, the temperature measuring probe 3 is closer to the limit ring 12, and the temperature measuring probe 3 is at least parallel to the top or bottom of one side of the laser diode 2, which can better detect the temperature of the laser diode 2 and the measurement accuracy is higher.

[0037] In some embodiments of this application, please refer to Figure 1 and Figure 9 Along the axial direction of the temperature measuring hole 11, the temperature measuring section of the temperature measuring hole 11 completely covers the mounting hole ring of the limiting ring 12. With this setting, the temperature measuring probe 3 can cover the entire laser diode 2, and the temperature changes at different positions of the laser diode 2 can be detected. The temperature measuring probe 3 captures the temperature changes of the laser diode 2 more accurately, making the measurement accuracy higher and less than 2mK.

[0038] It should be noted that the temperature measurement segment mentioned above refers to... Figure 1 and Figure 9 At the bottom of the temperature measuring hole 11, when the temperature measuring probe 3 is placed inside the temperature measuring hole 11, the detection part of the temperature measuring probe 3 is placed at the bottom of the temperature measuring hole 11, so that the temperature measuring hole 11 has a section that is clearly used for temperature measurement, which is the temperature measuring section of the temperature measuring hole 11.

[0039] In some embodiments of this application, the temperature measuring hole 11 is sealed and bonded to the temperature measuring probe 3, and the detection part of the temperature measuring probe 3 is placed at the bottom of the temperature measuring hole 11. With this arrangement, the temperature measuring hole 11 can effectively prevent the temperature measuring probe 3 from moving.

[0040] In some possible embodiments of this application, the opening end of the temperature measuring hole 11 is connected to the end of the temperature measuring probe 3 (i.e., via silicone rubber) Figure 1 The upper part is sealed and encapsulated. The inner wall of the temperature measuring hole 11 and the temperature measuring probe 3 are filled with thermally conductive silicone grease. With this setting, the silicone rubber can effectively prevent the thermally conductive silicone grease from vaporizing in a vacuum environment. The thermally conductive silicone between the temperature measuring hole 11 and the temperature measuring probe 3 can effectively conduct the heat emitted by the laser diode 2 to the temperature measuring probe 3, thereby achieving temperature control and detection at the thousandths of a degree below zero.

[0041] In a vacuum, most collimation structures will result in inaccurate temperature measurements due to poor thermal conductivity. This is because a vacuum causes the gas between two objects to disappear, leading to a sharp decrease in the thermal conductivity area of ​​the two objects, which in turn increases the thermal resistance. This application addresses this by directly mounting a temperature probe 3 on the limiting ring 12 that fixes the laser diode 2. The temperature probe 3 is separated from the laser diode 2 only by the collimation cylinder 1 and the thermally conductive adhesive, thus eliminating the possibility of a decrease in thermal conductivity area caused by a vacuum. This makes the temperature measurement in a vacuum environment more accurate.

[0042] The basic structure and principle of this solution are known from the above. The following section will describe the specific installation process.

[0043] S1. First, assemble the collimator by first attaching the aspherical lens to the adapter ring via threads.

[0044] S2. Install a rubber ring on the adapter ring that already has the aspherical lens installed.

[0045] S3. Install the collimator onto the base, and change the working distance of the lens by rotating the collimator.

[0046] S4. After wearing the electrostatic wrist strap, install the laser diode into the mounting hole of the base. During the process, the mounting hole needs to be erected to avoid radial displacement or damage to the laser diode.

[0047] S5. Screw the clamping ring into the mounting through hole and press it against the back of the installed laser diode, ensuring that there is no tendency for the two to shift relative to each other.

[0048] S6. Cover the front surface of the temperature measuring element with thermal grease, and use tweezers to put the thermal grease into the pre-drilled hole in the base. After filling it to one-fifth of its height, insert the vacuum probe, taking care to avoid the grease overflowing.

[0049] S7. Manually fill the gap between the temperature measuring element and the base with silicone rubber. This method can prevent some components of the thermal grease from vaporizing in the vacuum and contaminating the environment of the vacuum chamber.

[0050] S8. Allow to stand for at least 24 hours to ensure the silicone rubber is completely dry.

[0051] S9. After the silicone rubber is completely dry, the laser circuit module can be connected to the laser base and a vacuum can be drawn to start the experiment.

[0052] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A vacuum temperature measurement collimating sleeve, characterized in that, Includes a collimating cylinder, a laser diode, and a temperature probe; The collimating cylinder is provided with a through hole and a temperature measuring hole; A limiting ring is fitted inside the through hole, and the limiting ring is fixedly connected to the through hole. The laser diode is clamped inside the limiting ring. The temperature measuring hole extends from the peripheral wall of the collimating cylinder into the limiting retaining ring; The temperature probe is fitted into the temperature measuring hole, with the temperature measuring head of the probe facing the direction adjacent to the limiting ring. The temperature probe is used to detect the temperature of the laser diode.

2. The vacuum temperature measurement collimating sleeve according to claim 1, characterized in that, The temperature measuring hole is isolated from the hole of the limiting retaining ring to form a hole wall.

3. The vacuum temperature measuring collimating sleeve according to claim 1, characterized in that, Along the axial direction of the temperature measuring hole, the temperature measuring section of the temperature measuring hole at least covers the mounting hole of the limiting ring.

4. The vacuum temperature measuring collimating sleeve according to claim 3, characterized in that, Along the axial direction of the temperature measuring hole, the temperature measuring section of the temperature measuring hole completely covers the mounting hole of the limiting ring.

5. The vacuum temperature measuring collimating sleeve according to claim 1, characterized in that, The temperature measuring hole is sealed and bonded to the temperature measuring probe.

6. The vacuum temperature measuring collimating sleeve according to claim 5, characterized in that, The opening of the temperature measuring hole is sealed to the end of the temperature measuring probe by silicone rubber, and thermally conductive silicone grease is filled between the inner wall of the temperature measuring hole and the temperature measuring probe.

7. The vacuum temperature measurement collimating sleeve according to claim 1, characterized in that, The limiting retaining ring includes a narrow section; The laser diode is fixedly fitted within the narrow segment, which is used to keep the axis of the laser diode stable.

8. The vacuum temperature measuring collimating sleeve according to claim 7, characterized in that, The limiting retaining ring also includes a first width section and a second width section; Along the light emission direction, the second wide segment, the narrow segment, and the first wide segment are fixedly connected in sequence.

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