Laser-driven white light source device and control method thereof

Abstract

The invention discloses a laser-driven white light source device and a control method thereof. The laser-driven white light source device comprises a closed cavity, a built-in trigger device and a built-in laser device, a trigger point of the built-in trigger device is located in the closed cavity, and the trigger device triggers gas at the trigger point into plasma; laser emitted by the built-in laser device is irradiated to the trigger point, and the triggered plasma is maintained. The built-in trigger device and the built-in laser device are adopted, a glass carrier in the prior art is not adopted, and the laser emitted by the built-in laser device does not penetrate through the closed cavity and does not penetrate through the glass carrier in the prior art in the process of spreading to the trigger point; and the problems of overlarge luminous point size and lower radiation brightness caused by the surface type error of the glass carrier in the prior art are solved. Therefore, the size of the light-emitting point of the laser-driven white light source device is small, the radiation brightness is high, and the high-power laser-driven white light source device is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma light sources, and particularly to a laser-driven white light source device and a control method thereof. Background Art

[0002] A laser-driven light source uses a laser to drive a plasma to emit light, and a laser is added on the basis of an electroluminescent light source. The electroluminescent light source excites gas discharge in a lamp chamber by applying a high voltage to electrodes in the lamp chamber, and a plasma is excited to emit light; the laser of the laser irradiates the plasma, and the state of the emitting plasma is maintained by the laser.

[0003] In the prior art, the lamp chamber of a laser-driven light source uses a glass carrier and an external laser. The laser emitted by the external laser passes through the glass carrier to the plasma, and the surface shape error of the glass carrier will cause problems such as too large a light-emitting point size and low radiation brightness.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a laser-driven white light source device and a control method thereof in view of the above-mentioned defects of the prior art, aiming to solve the problems that the surface shape error of the glass carrier used in the laser-driven light source in the prior art will cause too large a light-emitting point size and low radiation brightness.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: A laser-driven white light source device, which includes: A closed cavity filled with gas; An in-built trigger device and an in-built laser device, both of which are built in the closed cavity; Wherein, the trigger point of the in-built trigger device is located inside the closed cavity, and the trigger device triggers the gas at the trigger point into a plasma; The laser emitted by the in-built laser device irradiates the trigger point and maintains the triggered plasma.

[0007] In the laser-driven white light source device, the laser emitted by the in-built laser device propagates entirely inside the closed cavity.

[0008] In the laser-driven white light source device, the gas further includes at least one of inert gas, hydrogen, and deuterium; and / or The laser-driven white light source device further includes a reflection structure for reflecting the laser emitted by the in-built laser device.

[0009] The described laser-driven white light source device, wherein the laser-driven white light source device further comprises: a first focusing structure; or the enclosed cavity forms a second focusing structure; Wherein, the first focusing structure or the second focusing structure is used to focus the laser emitted by the built-in laser device to the trigger point.

[0010] The described laser-driven white light source device, wherein the first focusing structure uses a focusing lens, and the second focusing structure uses a focusing mirror.

[0011] The described laser-driven white light source device, wherein the built-in trigger device comprises at least one of an electrical trigger device and a laser trigger device.

[0012] The described laser-driven white light source device, wherein the built-in laser device and the laser trigger device use coupled light output; and / or The laser-driven white light source device further comprises: a third focusing structure; the third focusing structure is used to focus the laser emitted by the laser trigger device to the trigger point.

[0013] The described laser-driven white light source device, wherein the laser-driven white light source device further comprises: A light output structure for propagating the light emitted by the plasma to the outside of the enclosed cavity.

[0014] The described laser-driven white light source device, wherein the light output structure comprises: A dichroic mirror located inside the enclosed cavity; A window plate provided on the cavity wall of the enclosed cavity; Wherein, the dichroic mirror is used to reflect the light emitted by the plasma to the window plate and penetrate the window plate.

[0015] A control method for a laser-driven white light source device as described in any one of the above, wherein the method includes the steps of: Controlling the built-in laser device to start; Controlling the built-in trigger device to start, and after triggering the gas at the trigger point to form a plasma, controlling the built-in trigger device to turn off.

[0016] Beneficial effects: The present application adopts a built-in trigger device and a built-in laser device, and does not use the glass carrier of the prior art. During the process of the laser emitted by the built-in laser device propagating to the trigger point, it does not pass through the closed cavity, let alone the glass carrier of the prior art. There is no problem of too large light-emitting point size and low radiation brightness caused by the surface shape error of the glass carrier of the prior art. Therefore, the light-emitting point size of the laser-driven white light source device of the present application is small, and the radiation brightness is high, forming a high-power laser-driven white light source device. Description of the Drawings

[0017] Figure 1 is the first structural schematic diagram of the laser-driven white light source device in the embodiment of the present invention.

[0018] Figure 2 is the second structural schematic diagram of the laser-driven white light source device in the embodiment of the present invention.

[0019] Figure 3 is the third structural schematic diagram of the laser-driven white light source device in the embodiment of the present invention.

[0020] Figure 4 is the fourth structural schematic diagram of the laser-driven white light source device in the embodiment of the present invention.

[0021] Figure 5 is the fifth structural schematic diagram of the laser-driven white light source device in the embodiment of the present invention.

[0022] Figure 6 is the sixth structural schematic diagram of the laser-driven white light source device in the embodiment of the present invention.

[0023] Figure 7 is the seventh structural schematic diagram of the laser-driven white light source device in the embodiment of the present invention.

[0024] 10. Closed cavity; 11. Second focusing structure; 12. Cylinder structure; 21. Trigger point; 22. Electric trigger device; 221. Built-in electrode; 222. External power supply; 23. Laser trigger device; 30. Built-in laser device; 41. Reflection structure; 42. First focusing structure; 43. Third focusing structure; 44. Light output structure; 441. Dichroic mirror; 442. Window piece; 50. Built-in coupling structure. Detailed Embodiments

[0025] To make the objectives, technical solutions and advantages of the present invention clearer and more definite, the following further describes the present invention in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Please refer to Figures 1 - 7, some embodiments of a laser-driven white light source device are provided by the present invention.

[0027] As Figure 1 shown, the laser-driven white light source device of the present invention includes: A closed cavity 10 filled with gas therein; A built-in trigger device and a built-in laser device 30, both built inside the closed cavity 10; Wherein, the trigger point 21 of the built-in trigger device is located inside the closed cavity 10, and the trigger device triggers the gas at the trigger point 21 into plasma; The laser emitted by the built-in laser device 30 irradiates the trigger point 21 and maintains the triggered plasma.

[0028] Specifically, the closed cavity 10 serves as a carrier for containing gas, and a built-in trigger device and a built-in laser device 30 are adopted. The built-in trigger device and the built-in laser device 30 are both built inside the closed cavity 10. "Built-in" means placed inside the closed cavity 10. The trigger structure of the built-in trigger device is located inside the closed cavity 10, and other structures of the built-in trigger device can be located inside or outside the closed cavity 10; the light outlet of the built-in laser device 30 is located inside the closed cavity 10, and other structures of the built-in laser device 30 can be located inside or outside the closed cavity 10. The built-in trigger device has a trigger point 21, which is located inside the closed cavity 10. The built-in trigger device triggers the gas at the trigger point 21 to form plasma (denoted as initial plasma). The laser emitted by the built-in laser device 30 irradiates the trigger point 21. After plasma is formed at the trigger point 21, the laser emitted by the built-in laser device 30 can maintain the state of the plasma (denoted as luminous plasma), and the luminous plasma emits light at the position of the trigger point 21 and forms a luminous point.

[0029] This application adopts a built-in trigger device and a built-in laser device 30, and does not adopt the glass carrier of the prior art. During the process of the laser emitted by the built-in laser device 30 propagating to the trigger point 21, it does not pass through the closed cavity 10, let alone pass through the glass carrier of the prior art. There is no problem of the large size of the luminous point and low radiation brightness caused by the surface shape error of the glass carrier of the prior art. Therefore, the size of the luminous point of the laser-driven white light source device in this application is small, the radiation brightness is high, and a high-power laser-driven white light source device is formed. In addition, the glass carrier in the prior art is relatively close to the luminous point, and the temperature of the luminous point is high, so the glass carrier needs to be replaced regularly. The laser-driven white light source device in this application greatly improves the service life of the light source, eliminates the cost caused by the need to regularly replace the closed cavity 10, and greatly improves the production efficiency at the equipment end.

[0030] The material used for the closed cavity 10 is a pressure-resistant material. The air pressure of the gas inside the closed cavity 10 can exceed the atmospheric pressure, and the closed cavity 10 has good sealing performance and pressure resistance. The material used for the closed cavity 10 can be a metal material or a non-metal material. The closed cavity 10 can include a transparent structure, and the light emitted by the luminous plasma exits from the transparent structure.

[0031] In a preferred implementation manner of the embodiment of the present invention, as Figure 1 shown, the laser emitted by the built-in laser device 30 propagates entirely inside the closed cavity 10.

[0032] Specifically, the laser emitted by the built-in laser device 30 propagates entirely inside the closed cavity 10 until it reaches the trigger point 21. The inner wall of the closed cavity 10 can be a reflective inner wall for reflecting the laser of the built-in laser device 30.

[0033] In a preferred implementation manner of the embodiment of the present invention, the gas further includes at least one of inert gas, hydrogen, and deuterium.

[0034] Specifically, the gas can be an inert gas, hydrogen, deuterium, etc. The inert gas is selected from at least one of helium, neon, argon, krypton, xenon, and radon.

[0035] In a preferred implementation manner of the embodiment of the present invention, as Figures 4 - 5 shown, the laser-driven white light source device further includes a reflection structure 41 for reflecting the laser emitted by the built-in laser device 30.

[0036] Specifically, in order to change the propagation direction of the laser of the built-in laser device 30, the reflection structure 41 is provided to reflect the laser emitted by the built-in laser device 30, so that the position of the built-in laser device 30 can be more flexible. The laser of the built-in laser device 30 can be a direct type and a reflection type. The direct type laser irradiates the trigger point 21 without passing through the reflection structure 41 (as Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 shown), and the reflection type laser is reflected by the reflection structure 41 to the trigger point 21 (as Figure 4 and Figure 5 shown).

[0037] In a preferred implementation manner of the embodiment of the present invention, as Figures 1 - 3 shown, the laser-driven white light source device further includes a first focusing structure 42 for focusing the laser emitted by the built-in laser device 30 to the trigger point 21.

[0038] Specifically, the first focusing structure 42 focuses the laser emitted by the built-in laser device 30 to the trigger point 21, concentrating the laser at the trigger point 21, thereby making it easier to maintain the plasma. The laser-driven white light source device further includes: a beam expanding structure; the beam expanding structure is used to expand the laser emitted by the built-in laser device 30. The laser beam emitted by the built-in laser device 30 is expanded by the beam expanding structure and then focused by the first focusing structure 42.

[0039] In a preferred implementation manner of the embodiment of the present invention, as Figures 4 - 7 shown, the closed cavity 10 forms a second focusing structure 11; the second focusing structure 11 is used to focus the laser emitted by the built-in laser device 30 to the trigger point 21.

[0040] Specifically, the second focusing structure 11 focuses the laser emitted by the built-in laser device 30 to the trigger point 21. The second focusing structure 11 is a part of the closed cavity 10. The laser emitted by the built-in laser device 30 irradiates on the second focusing structure 11 of the closed cavity 10 and is thus focused to the trigger point 21. The closed cavity 10 further forms a cylindrical structure 12, and the cylindrical structure 12 is connected to the second focusing structure 11 to form the closed cavity 10.

[0041] In a preferred implementation manner of the embodiment of the present invention, as Figures 1 - 3 shown, the first focusing structure 42 employs a focusing lens.

[0042] Specifically, the first focusing structure 42 can adopt a focusing lens, and the focusing lens can be a convex lens, an aspherical lens, or a diffractive lens.

[0043] In a preferred implementation manner of the embodiment of the present invention, as Figures 4 - 7 shown, the second focusing structure 11 employs a focusing mirror.

[0044] Specifically, the second focusing structure 11 adopts a focusing mirror, and the focusing mirror can be a parabolic mirror, an elliptical mirror, or a hyperbolic mirror. The second focusing structure 11 and the cylindrical structure 12 can be made of metal, and the second focusing structure 11 and the cylindrical structure 12 can be connected by welding, such as welding methods like laser welding, argon arc welding, spot welding, etc. The closed cavity 10 can also be integrally formed with reserved mounting holes for installing the built-in trigger device and the built-in laser device 30.

[0045] In a preferred implementation manner of the embodiment of the present invention, the built-in trigger device includes at least one of: an electric trigger device 22 and a laser trigger device 23.

[0046] Specifically, the electric trigger device 22 uses electrical energy to trigger the gas to form plasma, and the laser trigger device 23 uses laser to trigger the gas to form plasma.

[0047] In a preferred implementation manner of the embodiment of the present invention, as Figure 1 , Figure 4 and Figure 6 shown, the electric trigger device 22 includes: An internal electrode 221, which is built in the closed cavity 10; An external power supply 222, which is located outside the closed cavity 10; Wherein, the internal electrode 221 is electrically connected to the external power supply 222.

[0048] Specifically, the internal electrode 221 is located inside the closed cavity 10, and the external power supply 222 is located outside the closed cavity 10. There are two internal electrodes 221, which are respectively located on both sides of the trigger point 21. The external power supply 222 can adopt a high-voltage power supply. The external power supply 222 supplies power to the internal electrode 221.

[0049] In a preferred implementation manner of the embodiment of the present invention, as Figure 2 , Figure 3 , Figure 5 and Figure 7 shown, the laser trigger device 23 can adopt a pulsed laser trigger device 23, and a focusing optical system or a coupling optical system can also be configured for the pulsed laser trigger device 23, etc.

[0050] In a preferred implementation manner of the embodiment of the present invention, as Figure 3 , Figure 5 and Figure 7 shown, the built-in laser device 30 and the laser trigger device 23 adopt coupled light output.

[0051] Specifically, the built-in laser device 30 and the laser trigger device 23 can adopt the same light output port, an internal coupling structure 50 is arranged on the light output port, and the built-in laser device 30 and the laser trigger device 23 are arranged and connected to the internal coupling structure 50. The laser emitted by the built-in laser device 30 and the laser emitted by the laser trigger device 23 both propagate to the trigger point 21 through the internal coupling structure 50. When the built-in laser device 30 and the laser trigger device 23 adopt coupled light output, since the laser emitted by the built-in laser device 30 and the laser emitted by the laser trigger device 23 both propagate to the trigger point 21, the built-in laser device 30 and the laser trigger device 23 can also share other structures, for example, a first focusing structure 42, a second focusing structure 11, a reflection structure 41, etc. The built-in laser device 30 is a continuous laser device, and the built-in laser device 30 can adopt a semiconductor laser, a gas laser or a solid laser.

[0052] In a preferred implementation manner of the embodiment of the present invention, as Figure 2As shown, the laser-driven white light source device further includes: a third focusing structure 43; the third focusing structure 43 is used to focus the laser emitted by the laser triggering device 23 onto the triggering point 21.

[0053] Specifically, the third focusing structure 43 is used to focus the laser emitted by the laser triggering device 23 onto the triggering point 21. The built-in laser device 30 and the laser triggering device 23 may not adopt coupled light output, and then a third focusing structure 43 may be configured for the laser triggering device 23.

[0054] In a preferred implementation manner of the embodiment of the present invention, as Figures 4 - 7 shown, the laser-driven white light source device further includes: a light output structure 44, which is used to transmit the light emitted by the plasma to the outside of the closed cavity 10.

[0055] Specifically, the light output structure 44 transmits the light emitted by the plasma to the outside of the closed cavity 10. When the closed cavity 10 is made of a transparent material, the light emitted by the plasma at the light-emitting point can directly penetrate the closed cavity 10 and reach the outside of the closed cavity 10. When the closed cavity 10 is formed with a second focusing structure 11, the light emitted by the plasma at the light-emitting point can be transmitted to the light output structure 44, or reflected by the second focusing structure 11 to the light output structure 44.

[0056] In a preferred implementation manner of the embodiment of the present invention, as Figures 4 - 7 shown, the light output structure 44 includes: a dichroic mirror 441, which is located inside the closed cavity 10; a window pane 442, which is arranged on the cavity wall of the closed cavity 10; wherein, the dichroic mirror 441 is used to reflect the light emitted by the plasma to the window pane 442 and penetrate the window pane 442.

[0057] Specifically, the dichroic mirror 441 can reflect the light emitted by the plasma, and can transmit the laser emitted by the built-in laser device 30 and the laser emitted by the laser triggering device 23. A window is formed on the cylinder structure 12, and the window pane 442 is installed on the window. Specifically, the window edge and the window pane 442 can be connected by welding, for example, welding methods such as laser welding, argon arc welding, and spot welding.

[0058] Based on the laser-driven white light source device described in any of the above embodiments, the present invention further provides a preferred embodiment of a control method for the laser-driven white light source device: The control method of the laser-driven white light source device according to the embodiment of the present invention includes the following steps: Step S100, controlling the built-in laser device to start; Step S200: Control the built-in trigger device to start. After triggering the gas at the trigger point into plasma, control the built-in trigger device to turn off.

[0059] Specifically, the built-in laser device and the built-in trigger device can be started simultaneously, or the built-in laser device can be started first and then the built-in trigger device. The interval time between the two is relatively short. When the built-in trigger device is not started, the laser emitted by the built-in laser device propagates to the trigger point and can heat the air at the trigger point. Then, when the laser trigger device is started and triggers the gas at the trigger point, it is easier to form plasma. When the laser emitted by the built-in laser device can maintain the plasma formed by the triggering of the built-in trigger device, the built-in trigger device can be turned off.

[0060] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description. All such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A laser driven white light source device, characterized in that: include: A closed cavity filled with gas; A built-in trigger device and a built-in laser device are both built into the closed cavity; Wherein, the trigger point of the built-in trigger device is located inside the closed cavity, and the trigger device triggers the gas at the trigger point into plasma; The laser emitted by the built-in laser device irradiates the trigger point and maintains the triggered plasma.

2. The laser driven white light source device according to claim 1, characterized in that: The lasers emitted by the built-in laser device are all propagated inside the closed cavity.

3. The laser driven white light source device according to claim 1, characterized in that: The gas further comprises: at least one of an inert gas, hydrogen, and deuterium; and / or The laser driven white light source device further comprises: a reflection structure, wherein the reflection structure is used to reflect the laser light emitted by the built-in laser device.

4. The laser driven white light source device according to claim 1, characterized in that: The laser driven white light source device further comprises: a first focusing structure; or the closed cavity forms a second focusing structure; Wherein, the first focusing structure or the second focusing structure is used to focus the laser emitted by the built-in laser device to the trigger point.

5. The laser driven white light source device according to claim 4, characterized in that: The first focusing structure adopts a focusing lens, and the second focusing structure adopts a focusing reflector.

6. The laser driven white light source device according to any one of claims 1 to 5, characterized in that: The built-in trigger device includes at least one of an electric trigger device and a laser trigger device.

7. The laser driven white light source device according to claim 6, characterized in that: The built-in laser device and the laser trigger device use coupled light output; and / or The laser driven white light source device further includes: a third focusing structure; the third focusing structure is used to focus the laser emitted by the laser triggering device to the triggering point.

8. The laser driven white light source device according to any one of claims 1 to 5, characterized in that: The laser driven white light source device further comprises: The light emitting structure is used to transmit the light emitted by the plasma to the outside of the closed cavity.

9. The laser driven white light source device according to claim 8, characterized in that: The light output structure comprises: A dichroic mirror, located in the closed cavity; A window sheet, arranged on the cavity wall of the closed cavity; The dichroic mirror is used to reflect the light emitted by the plasma to the window plate and penetrate the window plate.

10. A control method for a laser driven white light source device according to any one of claims 1 to 9, characterized in that: Includes steps: Control the start of the built-in laser device; The built-in trigger device is controlled to start, and after the gas at the trigger point is triggered into plasma, the built-in trigger device is controlled to close.

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