阅读说明：本技术 脉冲激光器及激光系统 (Pulse laser and laser system ) 是由 郭晓杨 何会军 林庆典 余军 朱文涛 周沧涛 阮双琛 于 2020-07-28 设计创作，主要内容包括：本发明公开了一种脉冲激光器及激光系统,其中,脉冲激光器,包括：脉冲光源,用于产生初始激光脉冲；展宽器,与所述脉冲光源进行耦合连接,用于对所述初始激光脉冲进行脉冲展宽以生成第一激光脉冲；脉冲选择器,与所述展宽器耦合连接,用于对所述第一激光脉冲进行选择并获取第二激光脉冲；冷冻真空放大器,与所述脉冲选择器耦合连接,用于所述第二激光脉冲进行放大；脉冲压缩器,与所述冷冻真空放大器耦合连接,用于对所述第二激光脉冲进行压缩并生成目的激光脉冲。本发明实施例中的脉冲激光器可提供高重复频率、超强功率的超短脉冲。(The invention discloses a pulse laser and a laser system, wherein the pulse laser comprises: a pulsed light source for generating an initial laser pulse; a stretcher coupled to the pulsed light source for pulse stretching the initial laser pulses to generate first laser pulses; the pulse selector is coupled with the stretcher and used for selecting the first laser pulse and acquiring a second laser pulse; the freezing vacuum amplifier is coupled with the pulse selector and used for amplifying the second laser pulse; and the pulse compressor is coupled with the freezing vacuum amplifier and used for compressing the second laser pulse and generating a target laser pulse. The pulse laser in the embodiment of the invention can provide ultrashort pulses with high repetition frequency and ultra-strong power.)

1. A pulsed laser, comprising:

a pulsed light source for generating an initial laser pulse;

a stretcher coupled to the pulsed light source for pulse stretching the initial laser pulses to generate first laser pulses;

the pulse selector is coupled with the stretcher and used for selecting the first laser pulse and acquiring a second laser pulse;

the regenerative amplifier is coupled with the pulse selector and is used for performing pulse amplification on the second laser pulse;

the freezing vacuum amplifier is coupled with the pulse selector and used for amplifying the second laser pulse;

and the pulse compressor is coupled with the freezing vacuum amplifier and used for compressing the second laser pulse and generating a target laser pulse.

2. The pulsed laser of claim 1, further comprising:

and the pulse selection controller is connected with the pulse selector and is used for controlling the pulse selector.

3. The pulsed laser of claim 1, wherein the cryovacuum amplifier comprises:

a first laser window sheet;

the third laser crystal is coupled with the first laser window sheet;

the low-temperature controller is connected with the third laser crystal and used for controlling the temperature of the third laser crystal;

the third pumping device is coupled with the third laser crystal and used for exciting the third laser crystal;

the second laser window piece is coupled with the third laser crystal;

the first laser window piece and the second laser window piece are arranged oppositely to limit an amplification cavity.

4. The pulsed laser of claim 3, wherein the third laser crystal is a Yb: KGW crystal.

5. The pulsed laser of claim 2, wherein the pulse selector comprises:

a first polarizer for receiving the first laser light pulse;

the first half-wave plate is coupled with the first polaroid and used for adjusting the phase of the first laser pulse and converting the first laser pulse into a first polarized pulse;

the polarization state rotator is coupled with the first half wave plate and used for carrying out polarization processing on the polarization state of the first polarization pulse and generating a second laser pulse;

and the second polaroid is coupled with the polarization state rotator and used for adjusting the polarization state and/or the propagation direction of the second laser pulse.

6. The pulsed laser of claim 5, wherein said pulse selector further comprises:

the first quarter-wave plate is coupled with the second polarizer and used for carrying out phase adjustment on the second laser pulse;

the Pockels cell is coupled with the first quarter-wave plate and used for carrying out phase adjustment on the second laser pulse;

and the first high-reflection mirror is coupled with the Pockels cell and used for reflecting the second laser pulse.

7. The pulsed laser of claim 2, wherein the regenerative amplifier further comprises:

the first pumping device is used for carrying out first amplification treatment on the second laser pulse;

and the second pumping device is coupled with the first pumping device and is used for carrying out second amplification treatment on the second laser pulse.

8. The pulsed laser of claim 7, wherein the first pumping means comprises:

a first laser crystal;

the first dichroic mirror is coupled and connected with the first laser crystal;

the first convex lens group is coupled with the first dichroic mirror and arranged on one side of the first dichroic mirror, which is far away from the first laser crystal;

the first pump optical fiber is coupled with the first convex lens group;

the first semiconductor pumping source is coupled with the first pumping optical fiber and used for exciting the first laser crystal;

the second pumping means comprises:

a second laser crystal;

a second dichroic mirror coupled to the second laser crystal;

the second convex lens group is coupled with the second dichroic mirror and arranged on two sides of the second dichroic mirror far away from the second laser crystal;

the second pumping optical fiber is coupled with the second convex lens group;

and the second semiconductor pump source is coupled with the second pump optical fiber and used for exciting the second laser crystal.

9. The pulsed laser of claim 7, wherein the pulse compressor comprises:

the first pulse compressor is coupled with the freezing vacuum amplifier and used for compressing the second laser pulse and generating a first target pulse;

and the second pulse compressor is coupled with the first pulse compressor and used for carrying out nonlinear compression processing on the first target pulse and generating a second target pulse.

10. A laser system comprising a pulsed laser according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of laser pulse, in particular to a pulse laser and a laser system.

Background

With the continuous development of laser technology, the peak power of the ultra-strong ultra-short laser system can reach a beat tile (10)¹⁵W) and is widely applied to the experiment of the interaction of super-strong field laser substances, such as ultra-short X-ray radiation, generation of higher harmonics, laser wake field particle acceleration, fast ignition laser nuclear fusion and the like.

In the related art, the ultrashort laser system generally uses a Sapphire crystal as a laser crystal, but the Sapphire crystal has a short lifetime of the upper energy level, resulting in low electro-optical efficiency.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the present invention provides a pulse laser capable of providing ultrashort pulses with high repetition frequency and ultra-strong power.

The invention also provides a laser system with the pulse laser.

A pulsed laser according to an embodiment of the first aspect of the invention, comprises: a pulsed light source for generating an initial laser pulse; a stretcher coupled to the pulsed light source for pulse stretching the initial laser pulses to generate first laser pulses; the pulse selector is coupled with the stretcher and used for selecting the first laser pulse and acquiring a second laser pulse; the regenerative amplifier is coupled with the pulse selector and is used for performing pulse amplification on the second laser pulse; the freezing vacuum amplifier is coupled with the pulse selector and used for amplifying the second laser pulse; and the pulse compressor is coupled with the freezing vacuum amplifier and used for compressing the second laser pulse and generating a target laser pulse.

The pulse laser according to the embodiment of the invention has at least the following beneficial effects: an initial laser pulse is provided by a pulsed light source, and a stretcher spreads the initial laser pulse according to the wavelength of the initial laser pulse and forms a pulse sequence. The pulse selector selects laser pulses to be amplified in the pulse sequence according to preset parameters, the laser pulses to be amplified are amplified by the regenerative amplifier to preset values, then the laser pulses to be amplified are transmitted to the freezing vacuum amplifier, and the laser pulses to be amplified are amplified for the second time. And the pulse compressor compresses the laser pulse to be compressed and generates a target laser pulse.

According to some embodiments of the invention, further comprising: the pulse selection controller is connected with the pulse selector and is used for controlling the pulse selector;

according to some embodiments of the invention, the freeze vacuum amplifier comprises: a first laser window sheet; the third laser crystal is coupled with the first laser window sheet; the low-temperature controller is connected with the third laser crystal and used for controlling the temperature of the third laser crystal; the third pumping device is coupled with the third laser crystal and used for exciting the third laser crystal; the second laser window piece is coupled with the third laser crystal; the first laser window piece and the second laser window piece are arranged oppositely to limit an amplification cavity.

According to some embodiments of the invention, the third laser crystal is a Yb: KGW crystal.

According to some embodiments of the invention, the pulse selector comprises: a first polarizer for receiving the first laser light pulse; the first half-wave plate is coupled with the first polaroid and used for adjusting the phase of the first laser pulse and converting the first laser pulse into a first polarized pulse; the polarization state rotator is coupled with the first half wave plate and used for carrying out polarization processing on the polarization state of the first polarization pulse and generating a second laser pulse; and the second polaroid is coupled with the polarization state rotator and used for adjusting the polarization state and/or the propagation direction of the second laser pulse.

According to some embodiments of the invention, the pulse selector further comprises: a first quarter wave plate for phase adjusting the second laser pulse; the Pockels cell is coupled with the first quarter-wave plate and used for carrying out phase adjustment on the second laser pulse; and the first high-reflection mirror is coupled with the Pockels cell and used for reflecting the second laser pulse.

According to some embodiments of the invention, the regenerative amplifier further comprises: the first pumping device is used for carrying out first amplification treatment on the second laser pulse; and the second pumping device is coupled with the first pumping device and is used for carrying out second amplification treatment on the second laser pulse.

According to some embodiments of the invention, the first pumping device comprises: a first laser crystal; the first dichroic mirror is coupled and connected with the first laser crystal; the first convex lens group is coupled with the first dichroic mirror and arranged on one side of the first dichroic mirror, which is far away from the first laser crystal; the first pump optical fiber is coupled with the first convex lens group; the first semiconductor pumping source is coupled with the first pumping optical fiber and used for exciting the first laser crystal; the second pumping means comprises: a second laser crystal; a second dichroic mirror coupled to the second laser crystal; the second convex lens group is coupled with the second dichroic mirror and arranged on two sides of the second dichroic mirror far away from the second laser crystal; the second pumping optical fiber is coupled with the second convex lens group; and the second semiconductor pump source is coupled with the second pump optical fiber and used for exciting the second laser crystal.

According to some embodiments of the invention, the pulse compressor comprises: the first pulse compressor is coupled with the freezing vacuum amplifier and used for compressing the second laser pulse and generating a first target pulse; and the second pulse compressor is coupled with the first pulse compressor and used for carrying out nonlinear compression processing on the first target pulse and generating a second target pulse.

A laser system according to an embodiment of the second aspect of the invention comprises the pulsed laser of any of the embodiments described above.

The laser system according to the embodiment of the invention has at least the following beneficial effects: by using the pulse laser, ultrashort pulses with high repetition frequency and ultra-strong power are provided for a laser system.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a pulsed laser according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a pulse selector and a regenerative amplifier according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a freeze vacuum amplifier in an embodiment of the present invention.

Reference numerals:

100. a pulsed light source; 200. an isolator; 300. a stretcher; 410. a pulse selection controller; 420. a pulse selector; 500. a regenerative amplifier; 700. a freezing vacuum amplifier; 800. a pulse compressor; 801. a first pulse compressor; 802. a second pulse compressor; 421. a first polarizing plate; 422. a first half wave plate; 423. a polarization state rotator; 424. a second polarizing plate; 425. a first quarter wave plate; 426. a pockels cell; 427. a first high-reflection mirror; 501. a first semiconductor pump source; 502. a first pump fiber; 503. a first convex lens group; 504. a first dichroic mirror; 505. a first laser crystal; 506. a second semiconductor pump source; 507. a second pump fiber; 508. a second convex lens group; 509. a second dichroic mirror; 510. a second laser crystal; 511. a fourth high-reflection mirror; 512. a second high-reflection mirror; 513. a third high-reflection mirror; 514. a fourth high-reflection mirror; 600. a pump source; 701. a first laser window sheet; 702. a third laser crystal; 703. a second laser window sheet; 704. a low temperature controller; 705. a third dichroic mirror; 706. a third quarter wave plate; 707. a second cavity mirror; 708. a convex lens group; 709. a third transmission fiber; 710. a third pumping means; 711. a first cavity mirror.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.