A laser

Abstract

The application provides a laser, comprising: a seed source for providing a laser beam; a first fiber amplifier for reverse-pump amplification of the laser beam provided by the seed source; a second fiber amplifier for amplification of the laser beam amplified by the first fiber amplifier; and a compressor for compression of the laser beam amplified by the second fiber amplifier. Since the first fiber amplifier is used for reverse-pump amplification of the laser beam provided by the seed source, the application can avoid poor beam compression quality caused by nonlinear accumulation while broadening the spectral width of the laser beam to obtain complete wide-spectrum pulses.

Description

Technical Field

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

[0002] Since the 20th century, the laser industry has developed rapidly and has been widely used in cutting, welding, marking, and other fields. In recent years, with the gradual maturation of the laser industry, the quality of laser products has gained widespread recognition. The semiconductor industry, including chip, battery, and PCB manufacturing, is also undergoing a technological transformation from rotary cutting to laser processing. Currently, lasers are developing towards increasing power, narrowing pulse widths, and shortening wavelengths.

[0003] However, existing lasers suffer from poor beam compression quality while achieving narrow pulses. Therefore, improvements are needed to existing lasers to achieve better beam compression quality while obtaining narrow pulses. Summary of the Invention

[0004] The purpose of this invention is to provide a laser that solves the problem that existing lasers cannot simultaneously achieve narrow pulses and good beam compression quality.

[0005] To address the aforementioned technical problems, the present invention provides a laser, comprising: a seed source for providing a laser beam; a first-stage fiber amplifier for reverse-pumping amplification of the laser beam provided by the seed source; a second-stage fiber amplifier for amplifying the beam amplified by the first-stage fiber amplifier; and a compressor for compressing the beam amplified by the second-stage fiber amplifier.

[0006] Optionally, the first-stage fiber amplifier includes a first double-clad gain fiber connected at one end to the seed source, a first combiner connected at the output end to the other end of the first double-clad gain fiber, a first pump source connected to the pump end of the first combiner, and the second-stage fiber amplifier connected to the signal end of the first combiner.

[0007] Optionally, the length of the first double-clad gain fiber is 3.5m.

[0008] Optionally, the first double-clad gain fiber is a double-clad ytterbium-doped fiber.

[0009] Optionally, the power amplification ratio of the secondary fiber amplifier is 8 to 11 times.

[0010] Optionally, the secondary fiber amplifier includes a second combiner whose signal end is connected to the output end of the primary fiber amplifier, a second pump source connected to the pump end of the second combiner, a second double-clad gain fiber whose one end is connected to the output end of the second combiner, and the compressor connected to the other end of the second double-clad gain fiber.

[0011] Optionally, the second double-clad gain fiber is a double-clad ytterbium-doped fiber.

[0012] Optionally, the pulse width of the laser beam provided by the seed source is less than 1 PS.

[0013] Optionally, the compressor includes a collimator connected at one end to the secondary fiber amplifier, a first lens with its input end connected to the other end of the collimator, a first reflector with its input end connected to the output end of the first lens, a first grating with its input end connected to the output end of the first reflector, a second grating with its input end connected to the output end of the first grating, a second reflector with its input end connected to the output end of the second grating, a second lens with its input end connected to the input end of the first grating, a third reflector with its input end connected to the output end of the second lens, a third lens with its input end connected to the output end of the third reflector, and a second isolator connected to the output end of the third lens.

[0014] The laser provided by this invention has the following beneficial effects:

[0015] First, since the first-stage fiber amplifier is used to reverse pump amplify the laser beam provided by the seed source, it can broaden the spectral width of the laser beam to obtain a complete broadband pulse while avoiding poor beam compression quality caused by nonlinear accumulation.

[0016] Secondly, the laser is mainly based on an optical fiber structure, which can greatly improve system stability and reduce the size of the laser. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the laser structure in an embodiment of the present invention;

[0018] Figure 2 This is a pulse waveform diagram of the laser output in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures:

[0020] 100-seed source;

[0021] 210 - First double-clad gain fiber; 220 - First bundle combiner; 230 - First pump source;

[0022] 310 - Second combiner; 320 - Second pump source; 330 - Second double-clad gain fiber;

[0023] 411-Collider; 412-First lens; 413-First mirror; 414-First grating; 415-Second grating; 416-Second mirror; 417-Second lens; 418-Third mirror; 419-Third lens; 420-Second isolator;

[0024] 510 - First Isolator. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a laser in an embodiment of the present invention. This embodiment provides a laser, including: a seed source 100 for providing a laser beam; a first-stage fiber amplifier for reverse pumping amplification of the laser beam provided by the seed source 100; a second-stage fiber amplifier for amplifying the beam amplified by the first-stage fiber amplifier; and a compressor for compressing the beam amplified by the second-stage fiber amplifier.

[0032] Since the first-stage fiber amplifier is used to reverse pump amplify the laser beam provided by the seed source 100, it can broaden the spectral width of the laser beam to obtain a complete broadband pulse while avoiding poor beam compression quality caused by nonlinear accumulation.

[0033] refer to Figure 1 The first-stage fiber amplifier includes a first double-clad gain fiber 210 with one end connected to the seed source 100, a first combiner 220 with its output end connected to the other end of the first double-clad gain fiber 210, a first pump source 230 connected to the pump end of the first combiner 220, and the second-stage fiber amplifier is connected to the signal end of the first combiner 220. The laser beam provided by the seed source 100 enters the first double-clad gain fiber 210 from one end. The laser beam provided by the first pump source 230 enters the first combiner 220 from the pump end and then enters the first double-clad gain fiber 210 from the output end of the first combiner 220 through the other end of the first double-clad gain fiber 210. The laser beam in the first double-clad gain fiber 210 is amplified in power under the action of the pump light provided by the first pump source 230. The amplified laser beam enters the first combiner 220 from the output end of the first combiner 220 and exits from the signal end of the first combiner 220 into the second-stage fiber amplifier.

[0034] The preferred fiber length of the first double-clad gain fiber 210 is 3.5m.

[0035] In this embodiment, the power amplification ratio of the secondary fiber amplifier is 8 to 11 times. This allows for reasonable control of the second / third order dispersion of the laser pulse, providing more design margin for subsequent compression and making it easier to obtain a 100-femtosecond laser beam.

[0036] For details, please refer to Figure 1 The secondary fiber amplifier includes a second combiner 310 whose signal end is connected to the output end (signal end of the first combiner 220) of the primary fiber amplifier, a second pump source 320 connected to the pump end of the second combiner 310, a second double-clad gain fiber 330 whose one end is connected to the output end of the second combiner 310, and the compressor connected to the other end of the second double-clad gain fiber 330. The laser beam, after being amplified by the first-stage fiber amplifier, enters the second combiner 310 from the signal end. Then, it enters the second double-clad gain fiber 330 from one end of the output end of the second combiner 310. The pump light emitted from the second pump source 320 enters the second combiner 310 from the pump end. Then, it enters the second double-clad gain fiber 330 from one end of the output end of the second combiner 310. The laser beam in the second double-clad gain fiber 330 is amplified by the pump light and then enters the compressor from the other end of the second double-clad gain fiber 330.

[0037] Preferred, Reference Figure 1 The laser also includes a first isolator 510, which is disposed between the first-stage fiber amplifier and the second-stage fiber amplifier. Since the first-stage fiber amplifier uses reverse amplification technology, the reflected light from the second-stage fiber amplifier will be amplified in the first-stage fiber amplifier. The amplified beam from the first-stage fiber amplifier, when projected onto the seed source, poses a risk of damaging the seed source. Using the first isolator can effectively avoid this risk and improve the lifespan of the laser.

[0038] In this embodiment, the first double-clad gain fiber 210 is a double-clad ytterbium-doped fiber, and the second double-clad gain fiber 330 is a double-clad ytterbium-doped fiber, which further reduces nonlinear accumulation. Furthermore, the gain type of the seed source 100 is consistent with the gain types of the first-stage fiber amplifier and the second-stage fiber amplifier. The laser beam provided by the seed source 100 has a pulse width of less than 1 ps, thus facilitating the acquisition of a laser beam of hundreds of femtoseconds.

[0039] refer to Figure 1The compressor includes a collimator 411 with one end connected to the secondary fiber amplifier, a first lens 412 with its input end connected to the other end of the collimator 411, a first reflector 413 with its input end connected to the output end of the first lens 412, a first grating 414 with its input end connected to the output end of the first reflector 413, a second grating 415 with its input end connected to the output end of the first grating 414, a second reflector 416 with its input end connected to the output end of the second grating 415, a second lens 417 with its input end connected to the input end of the first grating 414, a third reflector 418 with its input end connected to the output end of the second lens 417, a third lens 419 with its input end connected to the output end of the third reflector 418, and a second isolator 420 with its output end connected to the third lens 419. The laser beam enters collimator 411 from one end, then from the other end through the input end of first lens 412, through the output end of first lens 412 and the input end of first reflector 413, through the output end of first reflector 413 and the input end of first grating 414, through the output end of first grating 414 and the input end of second grating 415, and through the output end of second grating 415 and the input end of second reflector 416. The light enters the second reflector 416 through the input end, then enters the second grating 415 through the input end of the second reflector 416 and the second grating 415, then enters the first grating 414 through the input end of the second grating 415 and the output end of the first grating 414, then enters the third reflector 418 through the input end of the first grating 414 and the input end of the third reflector 418, then enters the third lens 419 through the output end of the third reflector 418 and the input end of the third lens 419, then enters the second isolator 420 through the output end of the third lens 419, and finally exits from the second isolator 420.

[0040] In this embodiment, the high-power laser amplifier, when used in practice, selects a seed source 100 that can output a laser beam with a power of 20mW, a repetition rate of 80MHz, a center wavelength of 1034nm, a spectral width of 16nm, and a pulse width of 800fs. This laser beam from the seed source 100, after two stages of power amplification and compression, can produce a laser beam of hundreds of femtoseconds. Figure 2 As shown, Figure 2 This is a pulse waveform diagram of the laser output in an embodiment of the present invention, where the pulse width is 97 fs.

[0041] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A laser, characterized in that, include: A seed source for providing a laser beam; a primary fiber amplifier for reverse-pumping amplification of the laser beam provided by the seed source; a secondary fiber amplifier for amplifying the beam amplified by the primary fiber amplifier; and a compressor for compressing the beam amplified by the secondary fiber amplifier. The primary fiber amplifier includes a first double-clad gain fiber connected at one end to the seed source, a first combiner connected at the other end of the first double-clad gain fiber, a first pump source connected to the pump end of the first combiner, the secondary fiber amplifier being connected to the signal end of the first combiner, the fiber length of the first double-clad gain fiber being 3.5m, and the power amplification ratio of the secondary fiber amplifier being 8 to 11 times. A first isolator is provided between the compressor and the secondary fiber amplifier; the secondary fiber amplifier is a forward-pumped amplifier; the compressor includes a collimator connected at one end to the secondary fiber amplifier, a first lens connected at the input end to the other end of the collimator, a first reflector connected at the input end to the output end of the first lens, a first grating connected at the input end to the output end of the first reflector, a second grating connected at the input end to the output end of the first grating, a second reflector connected at the input end to the output end of the second grating, a second lens connected at the input end to the input end of the first grating, a third reflector connected at the input end to the output end of the second lens, a third lens connected at the input end to the output end of the third reflector, and a second isolator connected to the output end of the third lens.

2. The laser as described in claim 1, characterized in that, The first double-clad gain fiber is a double-clad ytterbium-doped fiber.

3. The laser as described in claim 1, characterized in that, The secondary fiber amplifier includes a second combiner whose signal end is connected to the output end of the primary fiber amplifier, a second pump source connected to the pump end of the second combiner, a second double-clad gain fiber whose one end is connected to the output end of the second combiner, and a compressor connected to the other end of the second double-clad gain fiber.

4. The laser as described in claim 3, characterized in that, The second double-clad gain fiber is a double-clad ytterbium-doped fiber.

5. The laser as described in claim 1, characterized in that, The laser beam provided by the seed source has a pulse width of less than 1 PS.

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