A 1940 nanometer mid-infrared laser

Abstract

The utility model discloses a 1940 nanometer middle infrared laser, including the box, be equipped with the heat preservation storehouse in the box, the heat preservation storehouse outside is equipped with a plurality of U type refrigeration pipes of horizontal lay arrangement evenly, and the U type refrigeration pipe U type arm top respectively converge to the liquid inlet pipe of above and the liquid outlet pipe of below, and the heat preservation storehouse is equipped with the pump source in proper order through the optical fiber connection, the beam combiner, the gain optical fiber / resonant cavity, the cladding light stripper, and the pump source is equipped with the electric refrigeration piece outward, and the electric refrigeration piece is equipped with the fin of corresponding outward, and the fin of the sheet body between inside is equipped with a plurality of liquid cooling plates, and the liquid cooling plate both ends are equipped with the liquid outlet thin pipe and the liquid inlet thin pipe respectively and converge to the liquid outlet pipe and the liquid inlet pipe respectively through the pipeline intercommunication of the pipe. The utility model has the beneficial effects that: the utility model through the precision temperature control to the pump source, fundamentally eliminates the gain efficiency variation caused by the pump wavelength drift, ensures the long -term stability of laser output wavelength and power. This is vital to the medical operation of predictable, repeatable energy dose.

Description

Technical Field

[0001] This utility model relates to the field of laser-related technology, specifically a 1940 nm mid-infrared laser. Background Technology

[0002] Currently, the mainstream technology for achieving 1940nm laser output is to use thulium doping (Tm). 3 (⁺) Fiber optics serve as the gain medium and are pumped by a semiconductor laser diode (LD) with a wavelength of approximately 790 nm. A typical 1940 nm fiber laser mainly includes the following core optical components: a pump source, a pump combiner, a thulium-doped gain fiber (usually forming a resonant cavity with a fiber grating), a cladding stripper, and a laser output head. These components are cascaded sequentially via fusion splices or connectors to form a complete optical path from pump light injection to 1940 nm laser output. Because its wavelength is located at the strong absorption peak of water molecules, this laser offers unique advantages in biological tissues, including precise cutting, minimal thermal damage, and excellent hemostasis. Therefore, it is particularly suitable for minimally invasive urological surgeries (such as prostate vaporization resection and lithotripsy), delicate dermatological treatments, and vascular closure.

[0003] Current laser cooling solutions, whether overall air cooling or simple liquid cooling, treat all internal components of the laser as a single heat source, dissipating heat through chassis cooling fans or a single circulating liquid cooling plate. The main drawback is the inability to achieve precise temperature control of core, sensitive components. This is especially true for the pump source semiconductor laser diode, whose emission wavelength typically drifts with junction temperature by approximately 0.3 nm / °C. With overall cooling, the pump source's operating temperature fluctuates with ambient temperature and its own workload, causing the output pump wavelength to deviate from the optimal absorption peak of the thulium-doped fiber. This results in unstable overall output power and efficiency, severely impacting the predictability and safety of medical procedures. To achieve higher control precision, some designs attempt to equip the pump source, beam combiner, and other major heat-generating components with independent TECs (thermal control devices). While this approach improves local temperature control accuracy, it leads to extreme system complexity, high cost, enormous energy consumption, and reduced reliability. Utility Model Content

[0004] To address the aforementioned shortcomings, this utility model provides the following technical solution: A 1940 nm mid-infrared laser includes a housing with an insulated chamber inside. Several horizontally arranged U-shaped cooling tubes are uniformly arranged outside the insulated chamber. The top ends of the U-shaped arms of the U-shaped cooling tubes converge to an upper inlet pipe and a lower outlet pipe, respectively. Inside the insulated chamber, a pump source, a beam combiner, a gain fiber / resonant cavity, and a cladding stripper are sequentially arranged via optical fibers. An electrocooling chip is located outside the pump source, and a corresponding heat sink is located outside the electrocooling chip. Several liquid-cooled plates are arranged between the heat sink plates. A liquid outlet capillary tube and a liquid inlet capillary tube are respectively provided at both ends of the liquid-cooled plates, and these converging pipes connect to the liquid outlet pipe and the liquid inlet pipe, respectively.

[0005] Furthermore, the bundle combiner, gain fiber / resonant cavity, and cladding stripper are also equipped with heat sinks. Several liquid cooling plates are also provided between the plates of the heat sink. At the two ends of the liquid cooling plates, liquid outlet tubes and liquid inlet tubes are respectively provided, and the liquid outlet tubes and liquid inlet tubes are respectively connected to the liquid outlet tubes and the liquid inlet tubes.

[0006] Furthermore, polyurethane foam is provided between the insulated compartment and the box body.

[0007] Furthermore, the inner surfaces of the inlet pipe and the outlet pipe are provided with several side pipes for the convergence of inlet and outlet liquids.

[0008] Furthermore, the inlet pipe and the outlet pipe pass through the housing and are connected to an external circulating refrigerant.

[0009] Furthermore, the inlet pipe and outlet pipe are arranged in parallel on one side of the outside of the insulation chamber, and the U-shaped refrigeration pipe is a flat square pipe.

[0010] Furthermore, the cladding optical stripper is connected to the outer laser head via an optical fiber.

[0011] The beneficial effects of this invention are as follows: 1. By precisely controlling the temperature of the pump source, this invention fundamentally eliminates the gain efficiency variation caused by pump wavelength drift, ensuring the long-term stability of the laser output wavelength and power. This is crucial for medical surgeries requiring predictable and repeatable energy doses; 2. Targeted and efficient heat dissipation of components such as the gain fiber and beam combiner effectively suppresses the thermal lensing effect and thermal degradation of materials, ensuring the stability of the laser beam quality and significantly reducing the risk of performance degradation or sudden failure due to overheating; 3. This invention eliminates the need for a built-in fan, effectively solving the noise interference problem caused by a fan. Attached Figure Description

[0012] Figure 1 This is a schematic cross-sectional view of the internal structure of this utility model; Figure 2 This is a schematic diagram of the U-shaped refrigeration pipe structure of this utility model; Figure 3 This is a schematic diagram of the liquid cooling plate structure of this utility model.

[0013] In the diagram: 1-box, 2-insulated chamber, 3-U-shaped cooling pipe, 4-inlet pipe, 5-outlet pipe, 6-pump source, 7-bundle combiner, 8-gain fiber / resonant cavity, 9-cladding stripper, 10-electric cooling chip, 11-heat sink, 12-liquid cooling plate, 13-outlet capillary tube, 14-inlet capillary tube, 15-side tube, 16-laser head. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Combination Figures 1 to 3 Shown: A 1940 nm mid-infrared laser includes a housing 1, an insulated chamber 2 inside the housing 1, and several horizontally arranged U-shaped cooling pipes 3 evenly arranged outside the insulated chamber 2. The top ends of the U-shaped arms of the U-shaped cooling pipes 3 converge to an upper liquid inlet pipe 4 and a lower liquid outlet pipe 5, respectively. The liquid inlet pipe 4 and the liquid outlet pipe 5 are arranged parallel to each other on one side of the outside of the insulated chamber 2. The U-shaped cooling pipes 3 are flat square tubes, generally made of thermally conductive metal, and are set in close contact with the insulated chamber to ensure smooth heat exchange.

[0016] Inside the insulated chamber 2, there are sequentially arranged a pump source 6, a bundler 7, a gain fiber / resonant cavity 8, and a cladding stripper 9, all connected by optical fibers. An electrothermal cooling chip 10 is located outside the pump source 6, and a corresponding heat sink 11 is located outside the electrothermal cooling chip 10. Several liquid-cooled plates 12 are installed between the heat sinks 11 to absorb the heat emitted by the heat sinks for rapid cooling. At both ends of the liquid-cooled plates 12, there are liquid outlet pipes 13 and liquid inlet pipes 14, which respectively converge to the liquid outlet pipe 5 and the liquid inlet pipe 4. The liquid inlet pipe 4 and the liquid outlet pipe 5 pass through the chamber 1 and connect to the external circulating refrigerant. Several side pipes 15 are provided on the inner sides of the liquid inlet pipe 4 and the liquid outlet pipe 5 for the convergence of liquid inlet and outlet.

[0017] The bundle combiner 7, gain fiber / resonant cavity 8, and cladding stripper 9 are also equipped with heat sinks 11. The heat sinks 11 are set according to the actual situation. Several liquid cooling plates 12 are also set between the plates of the heat sink 11. At both ends of the liquid cooling plates 12, there are liquid outlet capillary tubes 13 and liquid inlet capillary tubes 14 respectively, which are connected to the liquid outlet pipe 5 and the liquid inlet pipe 4. The number and position can be adjusted according to the actual situation. They can be set at intervals to obtain the appropriate heat dissipation effect.

[0018] Polyurethane foam is installed between the insulated chamber 2 and the box 1 to construct the internal cryogenic chamber.

[0019] The inlet pipe 4 and outlet pipe 5 pass through the housing 1 and are connected to the external circulating refrigerant.

[0020] The cladding stripper 9 is connected to the outer laser head 16 via optical fiber for laser output.

[0021] Working principle: When the laser is working, refrigerant enters through the inlet pipe, cools the insulation chamber through several U-shaped cooling pipes, and then the refrigerant flows to the outlet pipe. After flowing out, some of the refrigerant is split from the side pipe into the liquid cooling plates in the heat sink of the electrothermal chip, where it carries away heat. Then it flows back to the outlet pipe through the outlet capillary pipe. The temperature is controlled accordingly. The heat sink of the electrothermal chip can be equipped with a corresponding number of liquid cooling plates according to actual needs. Other laser components can also be equipped with heat sinks according to actual needs. A corresponding number of liquid cooling plates are installed in the gaps between the heat sinks as needed to ensure rapid cooling while maintaining temperature stability, thereby ensuring stable laser beam output.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0023] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A 1940 nm mid-infrared laser, characterized in that: The device includes a housing (1), which contains an insulated chamber (2). Several U-shaped cooling pipes (3) are evenly arranged horizontally outside the insulated chamber (2). The top ends of the U-shaped arms of the U-shaped cooling pipes (3) converge to the upper liquid inlet pipe (4) and the lower liquid outlet pipe (5). The insulated chamber (2) contains a pump source (6), a bundle combiner (7), a gain fiber / resonant cavity (8), and a cladding light stripper (9) connected by optical fibers. An electrocooling chip (10) is provided outside the pump source (6). A corresponding heat sink is provided outside the electrocooling chip (10). Several liquid cooling plates (12) are provided between the plates of the heat sink (11). The liquid cooling plates (12) have liquid outlet capillary tubes (13) and liquid inlet capillary tubes (14) at both ends, which converge to the liquid outlet pipe (5) and the liquid inlet pipe (4).

2. The 1940 nm mid-infrared laser according to claim 1, characterized in that: The bundle combiner (7), gain fiber / resonant cavity (8), and cladding stripper (9) are also provided with heat sinks (11). Several liquid cooling plates (12) are also provided between the plates of the heat sink (11). At the two ends of the liquid cooling plate (12), liquid outlet tubes (13) and liquid inlet tubes (14) are respectively provided and connected to the liquid outlet tube (5) and the liquid inlet tube (4).

3. A 1940 nm mid-infrared laser according to claim 1, characterized in that: The insulated compartment (2) and the box body (1) are filled with polyurethane foam.

4. A 1940 nm mid-infrared laser according to claim 1, characterized in that: The inner sides of the inlet pipe (4) and the outlet pipe (5) are provided with several side pipes (15) for the inlet and outlet flow.

5. A 1940 nm mid-infrared laser according to claim 1, characterized in that: The inlet pipe (4) and the outlet pipe (5) pass through the housing (1) and are connected to the external circulating refrigerant.

6. A 1940 nm mid-infrared laser according to claim 1, characterized in that: The inlet pipe (4) and outlet pipe (5) are arranged in parallel on one side of the outside of the heat preservation chamber (2), and the U-shaped refrigeration pipe (3) is a flat square pipe.

7. A 1940 nm mid-infrared laser according to claim 1, characterized in that: The cladding optical stripper (9) is optically connected to the laser head (16) on the outside.

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