High-speed adjustable pulse string laser generating device

Abstract

The utility model discloses a high-speed adjustable pulse string laser generating device, and belongs to the field of optical equipment manufacturing. Comprising a laser emitting part used for forming a plurality of strands of ultrashort pulse laser distributed along a laser light path; the laser adjustable beam combining piece is located on the laser light path and used for combining multiple strands of ultra-short pulse laser into one combined laser and carrying out delay control on the ultra-short pulse laser; and the combined laser is used for forming a cutting light spot capable of cutting the to-be-cut material on the to-be-cut material. The method has the beneficial effects that the time interval of each sub-pulse is adjusted by adopting a physical distance delay mode, the bandwidth limitation of the photoelectric modulator can be broken through, and the pulse time distribution is controlled. And the independent main amplifier is adopted, so that single pulse energy can be accurately controlled. Therefore, the high-speed adjustable high-power pulse string laser is obtained.

Description

Technical Field

[0001] The present application relates to the field of optical equipment manufacturing, and in particular to a device for generating a high-speed adjustable pulse train laser. Background Art

[0002] As a high-precision and high-efficiency material processing method, laser processing technology is widely used in manufacturing, electronics, medical equipment and other fields. In existing laser processing systems, pulse train processing is usually used to replace single high-energy pulses to achieve smaller heat-affected zones, finer control and higher surface quality without significantly reducing material removal rates. Traditional laser processing systems usually use a fixed pulse interval to implement the processing process. This static control method is restrictive in some cases. For example, when processing thin-walled structures, heat-sensitive materials or workpieces with extremely high surface quality requirements, traditional pulse interval settings may lead to heat accumulation effects, thermal damage and a non-negligible increase in surface roughness. The control problem of pulse intervals remains challenging in some specific application scenarios. We need a more flexible and intelligent pulse interval control system that can be optimized in real time according to different processing conditions, material types and final product requirements. Utility Model Content

[0003] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0004] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a high-speed adjustable pulse train laser generating device, including: a laser emitting element, used to form multiple ultrashort pulse lasers distributed along a laser optical path; a laser adjustable beam combining element, located on the laser optical path, used to combine multiple ultrashort pulse lasers into a combined laser and to control the delay of the ultrashort pulse laser; the combined laser is used to form a cutting spot on the material to be cut that can cut the material to be cut.

[0005] Furthermore, the device for generating a high-speed adjustable pulse train laser also includes a laser amplifier, which is used to amplify the power of multiple ultrashort pulse lasers.

[0006] Furthermore, the laser amplifier amplifies the powers of the plurality of ultrashort pulse lasers equally or unequally.

[0007] Furthermore, a plurality of adjustable laser beam combiners are provided; each adjustable laser beam combiner is used to combine two adjacent ultrashort laser pulses, until a plurality of ultrashort laser pulses are combined into one combined laser.

[0008] Furthermore, the laser adjustable beam combiner includes two groups of reflectors and a displacement structure for driving the two groups of reflectors to move along the ray direction of the ultrashort pulse laser; the two groups of reflectors will be used to make one of the ultrashort pulse lasers overlap with another adjacent ultrashort pulse laser after two reflections.

[0009] Furthermore, the ultrashort pulse laser is a high-quality, high-signal-to-noise ratio pulse light signal, with a repetition frequency of less than 200 MHz and a pulse width between 5 nanoseconds and 500 femtoseconds.

[0010] Furthermore, the laser emitting element comprises: a plurality of laser seed sources; each of the laser seed sources is used to form a beam of the ultrashort pulse laser.

[0011] Furthermore, the laser emitting element comprises: a laser seed source and a beam splitter; the laser seed source forms a plurality of ultrashort pulse lasers through the beam splitter.

[0012] Furthermore, the laser amplifier comprises a pump laser source, a pump beam combiner, a gain fiber and an inter-stage isolator; the energy of the pump laser source enters the gain fiber through the pump beam combiner to amplify the energy of the low-power front-stage signal.

[0013] The beneficial effects of the present application are: by adjusting the time interval of each sub-pulse by means of physical distance delay, the bandwidth limitation of the photoelectric modulator can be broken through, and the pulse time distribution can be controlled. By using an independent main amplifier, the energy of a single pulse can be accurately controlled. Thus, a high-speed, controllable, high-power pulse train laser is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0015] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0016] In the attached picture:

[0017] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0018] Figure 2 It is a block diagram of a laser emitting element forming multiple ultrashort pulse lasers according to another embodiment of the present application. DETAILED DESCRIPTION

[0019] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0020] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0021] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0022] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0023] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] Reference Figure 1-2 ,

[0025] A device for generating high-speed adjustable pulse train laser comprises a laser emitting component and an adjustable laser beam combining component.

[0026] The laser emitting element is used to form multiple ultrashort pulse lasers distributed along a laser optical path. The laser adjustable beam combiner is located on the laser optical path and is used to combine multiple ultrashort pulse lasers into one combined laser and to control the delay of the ultrashort pulse laser; the combined laser is used to form a cutting spot on the material to be cut that can cut the material to be cut. The cutting spot will cut the material to be cut.

[0027] Specifically, the device for generating a high-speed adjustable pulse train laser further includes a laser amplifier, which is used to amplify the power of multiple ultrashort pulse lasers.

[0028] Specifically, the laser amplifier amplifies the powers of the plurality of ultrashort pulse lasers equally or unequally.

[0029] Specifically, a plurality of adjustable laser beam combiners are provided; each adjustable laser beam combiner is used to combine two adjacent ultrashort laser pulses, until a plurality of ultrashort laser pulses are combined into one combined laser.

[0030] Specifically, the laser adjustable beam combiner includes two sets of reflectors and a displacement structure for driving the two sets of reflectors to move along the ray direction of the ultrashort pulse laser; the two sets of reflectors are used to make one ultrashort pulse laser overlap with another ultrashort pulse laser adjacent thereto after two reflections. The displacement structure adopts the existing technology. The displacement structure and the reflectors are both located in the housing forming the laser adjustable beam combiner.

[0031] Specifically, the ultrashort pulse laser is a high-quality, high-signal-to-noise ratio pulse light signal with a repetition frequency of less than 200 MHz and a pulse width between 5 nanoseconds and 500 femtoseconds.

[0032] Specifically, the laser emitting element includes: a plurality of laser seed sources; each of the laser seed sources is used to form a beam of the ultrashort pulse laser.

[0033] In other embodiments, the laser emitting element includes: a laser seed source and a beam splitter; the laser seed source forms a plurality of ultrashort pulse lasers through the beam splitter.

[0034] Specifically, the laser amplifier comprises a pump laser source, a pump beam combiner, a gain fiber and an inter-stage isolator; the energy of the pump laser source enters the gain fiber through the pump beam combiner to amplify the energy of the low-power front-stage signal.

[0035] Wherein, a plurality of groups of pump laser sources, pump combiners, gain optical fibers and inter-stage isolators are provided to amplify the plurality of ultrashort pulse lasers multiple times to achieve the required energy.

[0036] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A device for generating a high-speed adjustable pulse train laser, characterized in that: include: A laser emitting element, used to form multiple ultrashort pulse lasers distributed along a laser optical path; A laser adjustable beam combiner, located on the laser optical path, for combining multiple ultrashort pulse lasers into one combined laser and controlling the delay of the ultrashort pulse lasers; The combined laser is used to form a cutting spot on the material to be cut that can cut the material to be cut; The laser adjustable beam combiner comprises two groups of reflectors and a displacement structure for driving the two groups of reflectors to move along the ray direction of the ultrashort pulse laser; The two groups of reflecting mirrors are used to make one ultrashort pulse laser overlap with another adjacent ultrashort pulse laser after two reflections.

2. The device for generating a high-speed adjustable pulse train laser according to claim 1, characterized in that: The device for generating high-speed adjustable pulse train laser also includes a laser amplifier, which is used to amplify the power of multiple ultra-short pulse lasers.

3. The device for generating a high-speed adjustable pulse train laser according to claim 2, characterized in that: The laser amplifier amplifies the power of the plurality of ultrashort pulse lasers equally or unequally.

4. The device for generating a high-speed adjustable pulse train laser according to claim 3, characterized in that: A plurality of adjustable laser beam combiners are provided; each adjustable laser beam combiner is used to combine two adjacent ultrashort laser pulses, until a plurality of ultrashort laser pulses are combined into one combined laser.

5. The device for generating a high-speed adjustable pulse train laser according to claim 4, characterized in that: The ultrashort pulse laser is a high-quality, high-signal-to-noise ratio pulse light signal, with a repetition frequency of less than 200 MHz and a pulse width between 5 nanoseconds and 500 femtoseconds.

6. The device for generating a high-speed adjustable pulse train laser according to claim 5, characterized in that: The laser emitting element comprises: a plurality of laser seed sources; each of the laser seed sources is used to form a beam of the ultrashort pulse laser.

7. The device for generating a high-speed adjustable pulse train laser according to claim 5, characterized in that: The laser emitting element comprises: a laser seed source and a beam splitter; The laser seed source forms multiple ultrashort pulse lasers through a beam splitter.

8. The device for generating a high-speed adjustable pulse train laser according to claim 7, characterized in that: The laser amplifier comprises a pump laser source, a pump beam combiner, a gain optical fiber and an inter-stage isolator; The energy of the pump laser source enters the gain fiber through the pump combiner to amplify the energy of the low-power front-stage signal.

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