CN116345285B - Mixed ultrashort pulse series laser amplifier based on disc gain medium - Google Patents
Mixed ultrashort pulse series laser amplifier based on disc gain medium Download PDFInfo
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- H—ELECTRICITY
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- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
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Abstract
The invention discloses a hybrid ultrashort pulse series laser amplifier based on a disc gain medium, which comprises: a femtosecond seed light source; a nanosecond seed light source; the first polarization reflection unit is used for carrying out polarization conversion on the femtosecond seed light and the nanosecond seed light and combining the femtosecond seed light and the nanosecond seed light into combined beam light; the pulse processing unit is used for performing pulse train frequency reduction and pulse selection processing on the combined light; the polarization conversion module is used for carrying out polarization conversion on the combined light; the regenerative amplifier is used for continuously amplifying the combined beam light and outputting an ultrafast pulse sequence; the pulse selector is used for carrying out single pulse extraction on the ultrafast pulse sequence to obtain an amplified arbitrary single pulse train and/or a first mixed pulse sequence combination of multiple pulse combinations; and the grating compression module is used for carrying out pulse width adjustment on the first mixed pulse sequence combination and outputting the first mixed pulse sequence combination. The invention enables the effect of generating a synchronized mixed pulse train combination or a single pulse train with an adjustable time delay.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to a hybrid ultrashort pulse train laser amplifier based on a disc gain medium.
Background
Most laser systems currently typically only provide a single pulse duration, i.e. pulse width, for example only one of nanosecond pulse laser, picosecond pulse laser or femtosecond pulse laser is mentioned. In some applications, however, it may be desirable to mix pulses of different durations to obtain optimal application results, such as mixing nanosecond and picosecond pulsed lasers, or mixing nanosecond and femtosecond pulsed lasers, and so forth.
In response to the above-mentioned needs, the prior art generally involves a number of separate laser systems to accomplish the generation of pulses with different pulse characteristics. But it is clear that this approach is costly and not friendly in terms of system integration. Therefore, how to achieve two or more pulse synchronous outputs while reducing cost and space is a problem that needs to be addressed by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a hybrid ultrashort pulse train laser amplifier based on a disc gain medium, which aims to achieve the purposes of synchronously outputting two or more laser pulses, reducing production cost and reducing system space.
The embodiment of the invention provides a hybrid ultrashort pulse series laser amplifier based on a disc gain medium, which comprises the following components:
a femtosecond seed light source for providing a femtosecond seed light;
a nanosecond seed light source for providing nanosecond seed light;
the first polarization reflection unit is used for carrying out polarization conversion on the femtosecond seed light and the nanosecond seed light and combining the femtosecond seed light and the nanosecond seed light into combined beam light;
the pulse processing unit is used for performing pulse train frequency reduction and pulse selection processing on the combined beam light; the pulse processing unit sequentially comprises a first Praele box, a beam expander and a second polaroid along the light path propagation direction;
the polarization conversion module is used for carrying out polarization conversion on the combined beam light output by the pulse processing unit;
the regenerative amplifier is used for continuously amplifying the combined beam light and outputting an ultrafast pulse sequence comprising an amplified picosecond pulse sequence and a nanosecond pulse sequence;
the pulse selector is used for carrying out single pulse extraction on the ultrafast pulse sequence to obtain any single pulse train in the picosecond pulse sequence and the nanosecond pulse sequence or a first mixed pulse sequence combination of the picosecond pulse sequence and the nanosecond pulse sequence;
the grating compression module is used for performing pulse width compression on the first pulse sequence combination output by the pulse selector to obtain a second mixed pulse sequence combination containing a femtosecond pulse sequence and a nanosecond pulse sequence;
the first mixed pulse sequence combination is directly output through the pulse selector, or is output in a second mixed pulse sequence combination after pulse width compression through the grating compression module.
Further, the first polarization reflection unit comprises a first polarizer and a first reflector, wherein the first reflector is arranged on a transmission light path of the nanosecond seed light and is used for reflecting the nanosecond seed light to the first polarizer, the femtosecond seed light passes through the first polarizer in a p polarization state, and the nanosecond seed light is reflected out of the first polarizer in an s polarization state and is combined with the femtosecond seed light into the combined beam light.
Further, the polarization conversion module comprises a Faraday converter and a 1/2 glass slide which are sequentially arranged along the propagation direction of the light path.
Further, the regenerative amplifier includes a second pockels cell, a 1/4 glass slide, a thin film polarizer, a first reflecting unit, a multi-V-shaped reflecting mirror set composed of a first reflecting mirror set and a disk gain medium, and a second reflecting mirror set.
Further, an optical path adjusting unit is arranged on an optical path between the pulse selector and the grating compression module, and the first mixed pulse sequence combination is incident to the grating compression module after being adjusted by the optical path of the optical path adjusting unit.
Further, the light path adjusting unit is a folding lens.
Further, a second reflecting unit is arranged on the light path between the pulse selector and the light path adjusting unit, and a light receiving device is arranged on the reflecting light path of the second reflecting unit;
the second reflecting unit is used for reflecting the extracted single pulse train or other pulse sequences except the first mixed pulse sequence combination to the light receiving device for recycling.
Further, a second polarization reflection unit is arranged between the regenerative amplifier and the light path of the pulse selector, and the second polarization reflection unit at least comprises a third polaroid and a second reflector which are sequentially arranged on the output light path of the regenerative amplifier, and is used for carrying out polarization reflection on the rapid pulse sequence to the pulse selector.
Further, a third reflecting unit is arranged between the grating compression module and the optical path adjusting unit and used for reflecting the first mixed pulse sequence combination output by the optical path adjusting unit to the grating compression module;
and a fourth reflecting unit is arranged on an output optical path of the grating compression module and used for combining and reflecting the second mixed pulse sequence output by the grating compression module.
Further, the grating compression module comprises two transmission or reflection gratings which are parallel to each other, and one grating is fixed on the displacement platform so as to realize position adjustment.
The embodiment of the invention provides a hybrid ultrashort pulse train laser amplifier based on a disc gain medium, which combines output beams of two seed lasers into combined beams, inputs the combined beams into a regenerative amplifier, then combines a pulse selector and a grating compression module to realize the effect of generating a hybrid pulse sequence combination of synchronous femtosecond pulses, picosecond pulses and nanosecond pulses or a single pulse train with adjustable time delay, and the hybrid pulse sequence combination can be selected according to requirements, for example, the laser pulse combination of picosecond pulses and nanosecond pulses (namely, the first hybrid pulse sequence combination), or the laser pulse combination of the femtosecond pulses and nanosecond pulses (namely, the second hybrid pulse sequence combination), and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system configuration diagram of a hybrid ultrashort pulse-train laser amplifier based on a disk gain medium according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing pulse selection of a hybrid ultrashort pulse-string laser amplifier based on a disk gain medium according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing another pulse selection of a hybrid ultrashort pulse-string laser amplifier based on a disc gain medium according to an embodiment of the present invention;
fig. 4 (a), fig. 4 (b) and fig. 4 (c) are schematic diagrams illustrating time delay adjustment of a hybrid ultrashort pulse train laser amplifier based on a disc gain medium according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, an embodiment of the present invention provides a hybrid ultrashort pulse-train laser amplifier based on a disc gain medium, including:
a femtosecond seed light source 11 for providing a femtosecond seed light;
a nanosecond seed light source 12 for providing nanosecond seed light;
the first polarization reflection unit is used for carrying out polarization conversion on the femtosecond seed light and the nanosecond seed light and combining the femtosecond seed light and the nanosecond seed light into combined beam light;
the pulse processing unit is used for performing pulse train frequency reduction and pulse selection processing on the combined beam light; the pulse processing unit sequentially comprises a first Pockels cell 31, a beam expander 32 and a second polaroid 33 along the light path propagation direction;
the polarization conversion module is used for carrying out polarization conversion on the combined beam light output by the pulse processing unit;
a regenerative amplifier 50 for amplifying the combined beam light continuously and outputting an ultrafast pulse sequence including an amplified picosecond pulse sequence and a nanosecond pulse sequence;
a pulse selector 70, configured to perform single pulse extraction on the ultrafast pulse sequence, so as to obtain any single pulse train of a picosecond pulse sequence and a nanosecond pulse sequence and/or a first mixed pulse sequence combination of the picosecond pulse sequence and the nanosecond pulse sequence;
a grating compression module 110, configured to perform pulse width compression on the first mixed pulse sequence combination output by the pulse selector 70, so as to obtain a second mixed pulse sequence combination including a femtosecond pulse sequence and a nanosecond pulse sequence;
the first mixed pulse train combination is directly output via the pulse selector 70, or is output as a second mixed pulse train combination after pulse width compression via the grating compression module 110.
In this embodiment, the hybrid ultrashort pulse train laser amplifier outputs the femtosecond seed light and the nanosecond seed light through the femtosecond seed light source 11 and the nanosecond seed light source 12 respectively, and then combines the femtosecond seed light and the nanosecond seed light through the first polarization reflection unit to obtain combined beam light. The combined beam light is emitted by the first polarization reflecting unit, then enters the pulse processing unit, is subjected to pulse train down conversion processing and pulse selection processing by the first pockels cell 31, the beam expander 32 and the second polaroid 33 in the pulse processing unit, is subjected to polarization conversion processing by the polarization conversion module, then enters the regenerative amplifier 50, is continuously amplified by the regenerative amplifier 50, and outputs an ultrafast pulse sequence with laser pulses such as nanosecond pulse sequence, picosecond pulse sequence and the like obtained after amplification and amplification by the regenerative amplifier 50. For the ultrafast pulse sequence, the pulse selector 70 is used to select a required pulse sequence from the ultrafast pulse sequence, so as to achieve the purpose of ultrafast intensity modulation, and obtain a mixed pulse sequence combination of synchronous output, for example, a laser pulse combination of picosecond pulse and nanosecond pulse (i.e. the first mixed pulse sequence combination), or a laser pulse combination of femtosecond pulse and nanosecond pulse (i.e. the second mixed pulse sequence combination), and the like. Here, when the combination of the laser pulses of the femtosecond pulse and the nanosecond pulse needs to be output, the grating compression module 110 may perform pulse compression on the first mixed pulse train combination output by the pulse selector 70, and compress the picosecond pulse train therein into the femtosecond pulse train, thereby obtaining the second mixed pulse train combination.
The embodiment of the invention provides a hybrid ultrashort pulse train laser amplifier based on a disc gain medium, which combines the output beams of two seed lasers into combined beam light, and inputs the combined beam light into a regenerative amplifier 50, then combines a pulse selector 70 and a grating compression module 110 to realize the effect of generating any hybrid pulse sequence combination of synchronous femtosecond pulses, picosecond pulses and nanosecond pulses or a single pulse train with adjustable time delay, the hybrid pulse sequence combination can be selected according to requirements, and the hybrid pulse sequence combination also has the advantage of combining two time domain pulses by using only one laser source, so that the production cost and the compression system space can be reduced.
It should be noted that nanosecond lasers can provide higher material removal rates, with laser pulses heating the material from room temperature to its melting temperature, and eventually being removed by evaporation and expulsion of the molten material. Nanosecond lasers can provide a more economical, high throughput, and reasonable quality solution than picosecond and femtosecond lasers. Ultrafast picosecond lasers facilitate removal of heat affected regions of material and thermal effects within nanoseconds with a single pulse of lower energy, and therefore, more desirable processing results. Meanwhile, the ultrafast picosecond laser has the advantages of short working time, high precision, high processing speed and the like. Therefore, to accommodate different material processing and laser processing requirements, the hybrid ultrashort pulse train laser amplifier can be controlled to output femtosecond pulse trains, nanosecond pulse trains, picosecond pulse trains, and hybrid sequences of various pulses, and the number of selected pulses can also be adjusted. As shown in fig. 2 and 3, the femtosecond pulse train, the nanosecond pulse train, and the picosecond pulse train may be sequentially output, and the femtosecond pulse train, the nanosecond pulse train, and the picosecond pulse train may be cyclically output as needed. It should be noted that, the regenerative amplifier 50 in this embodiment may be a femtosecond laser regenerative amplifier based on a disc gain medium according to patent number 202210116639.0.
In addition, in conjunction with fig. 4 (a) to 4 (c), the synchronous output can also be achieved by adjusting the time delay of each laser pulse, where, taking fig. 4 (a) as an example, for picosecond (ps) pulse trains, a single pulse train can achieve time delay adjustment within times T < 0, t=0, and T > 0; for the mixed pulse train (i.e. the mixed pulse sequence combination) containing the picosecond pulse train, the picosecond pulse train in the mixed pulse train can be controlled to wait for a period of time (for example, 3 time scales in fig. 4 (a)) and then output a certain number of picosecond pulses, and delay adjustment is continued after that; for burst repetition (i.e., repetition frequency, number of pulses transmitted per second, which is the inverse of the pulse repetition interval, which is the time interval between one pulse and the next), it is also possible to delay the output of a certain number of picosecond pulses after waiting a period of time and continue the delay adjustment after the output. Fig. 4 (b) and fig. 4 (c) are the same as fig. 4 (a), and thus are not repeated here.
In a specific embodiment, the first polarization reflection unit includes a first polarizer 21 and a first mirror 22, where the first mirror 22 is disposed on a propagation light path of the nanosecond seed light, and is configured to reflect the nanosecond seed light onto the first polarizer 21, the femtosecond seed light passes through the first polarizer 21 in a p-polarization state, and the nanosecond seed light reflects out of the first polarizer 21 in an s-polarization state and is combined with the femtosecond seed light into the combined beam light.
The polarization conversion module includes a faraday converter 41 and a 1/2 glass slide 42 arranged in order along the propagation direction of the optical path.
After the femtosecond seed light and the nanosecond seed light are collimated, the femtosecond seed light is p-polarized, the nanosecond seed light is s-polarized, the nanosecond seed light is firstly incident on the first reflector 22 and is reflected to the first polaroid 21 by the first reflector 22, and then the first polaroid 21 is used for overlapping the femtosecond seed light and the nanosecond seed beam. The combined light is subjected to pulse-train frequency reduction and serial selection by the first pockels cell 31, the beam expander 32 and the second polarizer 33, sequentially passes through the faraday rotator 41, and is half-slipped and then enters the regenerative amplifier 50 for amplification.
In a specific embodiment, the regenerative amplifier 50 includes a second pockels cell 51, a 1/4 glass slide 52, a thin film polarizer 53, a first reflecting unit, a multi-V type mirror group consisting of a first mirror group and a disk gain medium 54, and a second mirror group.
The present embodiment achieves simultaneous amplification of the femtosecond seed light and the nanosecond seed light by the single regenerative amplifier 50. Taking the femtosecond seed light as an example, the femtosecond seed light is converted into circular polarization from linear p polarization after passing through the second Praeus box 51 without voltage and the 1/4 glass slide 52, and is converted into s polarization from circular polarization after passing through the first reflecting unit, and the s polarized femtosecond seed light enters the multi-V reflecting mirror group after being reflected by the film polarizer 53 after passing through the second Praeus box 51 without voltage; the femto second seed light is reflected between the first reflector group and the disc gain medium 54 for multiple times, then output into a multi-V reflector group, and enters into a second reflector group; the femtosecond seed light is reflected by the second reflecting mirror group and returns to the second Prikels box 51 loaded with the voltage of 1/4 glass slide 52 along the original light path, and s polarization is kept to oscillate back and forth in the regenerative amplifier 50 until the pulse energy gain of the femtosecond seed light is saturated; at this time, the femtosecond seed light passes through the second pockels cell 51 from which the voltage of the 1/4 glass slide 52 is removed, is reflected again by the first reflecting mirror, passes through the 1/4 glass slide 52, changes from s-polarization to p-polarization, passes through the thin film polarizer 53, the 1/2 glass slide 42 and the faraday rotator 41 in this order, changes from p-polarization to s-polarization, and is reflected by the thin film polarizer 53 and output as amplified femtosecond laser light. Here, the femtosecond seed light passes back and forth through the electro-optical crystal during amplification in the regenerative amplifier 50 to generate a nonlinear effect self-phase modulation SPM, so that the spectral bandwidth of the amplified laser light is widened to compensate for the loss of spectral components generated by the gain narrowing effect.
Specifically, the first reflecting mirror group sequentially comprises a third reflecting mirror, a fourth reflecting mirror, a fifth reflecting mirror, a sixth reflecting mirror and a seventh reflecting mirror along the light path, wherein the third reflecting mirror, the fourth reflecting mirror, the fifth reflecting mirror, the sixth reflecting mirror and the sixth reflecting mirror are distributed in a V shape and are arranged at 45 degrees, the third reflecting mirror, the fourth reflecting mirror and the seventh reflecting mirror are arranged at 45 degrees in the forward direction, and the fifth reflecting mirror and the sixth reflecting mirror are arranged at 45 degrees in the reverse direction. The second reflecting mirror group sequentially comprises an eighth reflecting mirror, a ninth reflecting mirror, a concave mirror, a convex mirror and a tenth reflecting mirror, wherein the eighth reflecting mirror is arranged at an angle of 45 degrees, the ninth reflecting mirror is arranged at an angle of 0 degree, and the tenth reflecting mirror is arranged at an angle of 0 degree along the light path.
In a specific embodiment, the optical path between the pulse selector 70 and the grating compression module 110 is provided with an optical path adjusting unit 90, and the single pulse train and/or the mixed pulse train combination is incident to the grating compression module 110 after being adjusted by the optical path of the optical path adjusting unit 90.
In this embodiment, the optical path adjusting unit 90 adjusts the optical path propagation direction of the single pulse train and the first mixed pulse train combination, so that the single pulse train and the first mixed pulse train combination can be smoothly incident into the grating compression module 110. Specifically, the optical path adjusting unit 90 is a folding lens. The folded lens can adjust the output light path of the combination of picosecond/nanosecond or the combination of femtosecond/nanosecond and other mixed pulse sequences, except that the amplified picosecond output light passes through the grating compression module 110, the adjustable pulse compressor comprises two transmission or reflection gratings parallel to each other, and one grating is fixed on the displacement platform to realize position adjustment. Thereby realizing the adjustable pulse width after compression.
Further, a second reflecting unit 81 is disposed on the optical path between the pulse selector 70 and the optical path adjusting unit 90, and a light receiving device 82 is disposed on the reflecting optical path of the second reflecting unit 81;
the second reflecting unit 81 is configured to reflect the extracted pulse trains other than the single pulse train or the mixed pulse train combination to the light receiving device 82 for recycling.
A second polarization reflecting means including at least a third polarizing plate 61 and a second reflecting mirror 62 is provided between the regenerative amplifier 50 and the optical path of the pulse selector 70.
In addition, a third reflecting unit 100 is disposed between the grating compression module 110 and the optical path adjusting unit 90, and is configured to reflect the femtosecond seed light and the nanosecond seed light output by the optical path adjusting unit 90 to the grating compression module 110;
the output optical path of the grating compression module 110 is provided with a fourth reflection unit 120, which is configured to reflect and output the femtosecond seed light and the nanosecond seed light output by the grating compression module 110.
After the ultrafast pulse sequence is output by the regenerative amplifier 50, the ultrafast pulse sequence is polarized and reflected to the pulse selector 70 through the third polarizer 61 and the second reflector 62 in the second polarization reflecting unit, the corresponding single pulse train or mixed pulse sequence combination is extracted by the pulse selector 70, and the other pulse sequences which are not extracted are reflected to the light receiving device 82 by the second reflecting unit 81, so that the other pulse sequences are recovered, and meanwhile, the quality influence on the extracted single pulse train or mixed pulse sequence combination is avoided. For the extracted single pulse train or mixed pulse sequence combination, the light path adjustment unit 90 and the third reflection unit 100 are sequentially used for adjusting the reflection to the grating compression module 110, and the pulse width adjustment of the grating compression module 110 is followed by the output of the fourth reflection unit 120. Of course, a single pulse train or a combination of mixed pulse sequences may be directly output after the optical path is adjusted by the optical path adjusting unit 90. Here, the second, third and fourth reflecting units 81, 100 and 120 are all reflecting mirrors, and the number of the reflecting mirrors may be specifically adjusted according to an actual scene.
In one embodiment, the grating compression module 110 includes two transmissive or reflective gratings parallel to each other, and one of the gratings is fixed to the displacement stage to achieve position adjustability.
In this embodiment, the grating compression module 110 mainly includes two parallel transmissive or reflective gratings, one of which is fixed on the displacement platform to adjust the distance between the grating pairs, thereby adjusting the pulse width after compression. For example, by changing the positions of the reflection gratings, for example, adjusting the distances between the two reflection gratings to 0mm, 20mm and 50mm, respectively, the changes of the output pulse ACF measured by the autocorrelation measuring are compared under the normalized light intensity condition, the positions of the reflection gratings are compared from 0mm to 50mm, and as the relative distance of the pair of reflection gratings increases, the pulse width is gradually compressed from 12ps to 400fs, that is, the nonlinear effect generated by the electro-optic crystal in the second pockels cell 51 effectively realizes the broadening of the spectral bandwidth from the phase modulation SPM, thereby compensating for the gain narrowing effect.
In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A hybrid ultrashort pulse train laser amplifier based on a disc gain medium, comprising:
a femtosecond seed light source for providing a femtosecond seed light;
a nanosecond seed light source for providing nanosecond seed light;
the first polarization reflection unit is used for carrying out polarization conversion on the femtosecond seed light and the nanosecond seed light and combining the femtosecond seed light and the nanosecond seed light into combined beam light;
the pulse processing unit is used for performing pulse train frequency reduction and pulse selection processing on the combined beam light; the pulse processing unit sequentially comprises a first Praele box, a beam expander and a second polaroid along the light path propagation direction;
the polarization conversion module is used for carrying out polarization conversion on the combined beam light output by the pulse processing unit;
the regenerative amplifier is used for continuously amplifying the combined beam light and outputting an ultrafast pulse sequence comprising an amplified picosecond pulse sequence and a nanosecond pulse sequence;
the pulse selector is used for carrying out single pulse extraction on the ultrafast pulse sequence to obtain any single pulse train in the picosecond pulse sequence and the nanosecond pulse sequence or a first mixed pulse sequence combination of the picosecond pulse sequence and the nanosecond pulse sequence;
the grating compression module is used for performing pulse width compression on the first mixed pulse sequence combination output by the pulse selector to obtain a second mixed pulse sequence combination containing a femtosecond pulse sequence and a nanosecond pulse sequence;
the first mixed pulse sequence combination is directly output through the pulse selector, or is output in a second mixed pulse sequence combination after pulse width compression through the grating compression module.
2. The disc gain medium based hybrid ultrashort pulse train laser amplifier of claim 1, wherein the first polarization reflection unit comprises a first polarizer and a first mirror, wherein the first mirror is disposed on a propagation optical path of the nanosecond seed light for reflecting the nanosecond seed light onto the first polarizer, the femtosecond seed light transmits the first polarizer in a p-polarization state, and the nanosecond seed light reflects out of the first polarizer in an s-polarization state and is combined with the femtosecond seed light into the combined beam.
3. The disc gain medium based hybrid ultrashort pulse train laser amplifier of claim 1, wherein the polarization conversion module comprises a faraday converter and a 1/2 glass slide arranged in sequence along the optical path propagation direction.
4. The disc gain medium based hybrid ultrashort pulse train laser amplifier of claim 1, wherein the regenerative amplifier comprises a second pockels cell, a 1/4 glass slide, a thin film polarizer, a first reflective unit, a multi-V mirror set consisting of a first mirror set and a disc gain medium, and a second mirror set.
5. The disc gain medium-based hybrid ultrashort pulse train laser amplifier according to claim 1, wherein an optical path adjusting unit is disposed on an optical path between the pulse selector and the grating compression module, and the first hybrid pulse train combination is incident to the grating compression module after being adjusted by the optical path of the optical path adjusting unit.
6. The disc gain medium based hybrid ultrashort pulse train laser amplifier of claim 5, wherein the optical path adjustment unit is a folded lens.
7. The disc gain medium-based hybrid ultrashort pulse train laser amplifier according to claim 5, wherein a second reflection unit is disposed on an optical path between the pulse selector and the optical path adjusting unit, and a light receiving device is disposed on a reflection optical path of the second reflection unit;
the second reflecting unit is used for reflecting the extracted single pulse train or other pulse sequences except the first mixed pulse sequence combination to the light receiving device for recycling.
8. The disc gain medium based hybrid ultrashort pulse train laser amplifier of claim 5, wherein a second polarization reflecting unit is disposed between the optical paths of the regenerative amplifier and the pulse selector, and the second polarization reflecting unit includes at least a third polarizer and a second mirror sequentially disposed on the output optical path of the regenerative amplifier, for polarization reflecting the fast pulse train into the pulse selector.
9. The disc gain medium-based hybrid ultrashort pulse train laser amplifier according to claim 5, wherein a third reflection unit is disposed between the grating compression module and the optical path adjustment unit, and is configured to reflect the first hybrid pulse train combination output by the optical path adjustment unit to the grating compression module;
and a fourth reflecting unit is arranged on an output optical path of the grating compression module and used for combining and reflecting the second mixed pulse sequence output by the grating compression module.
10. The disc gain medium based hybrid ultrashort pulse train laser amplifier of claim 1, wherein the grating compression module comprises two mutually parallel transmissive or reflective gratings, and wherein one grating is fixed on a displacement stage to achieve position adjustability.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111716004A (en) * | 2020-06-19 | 2020-09-29 | 西安交通大学 | Femtosecond-nanosecond ultra-pulse laser leveling processing system for ceramic matrix composite material |
| KR102235631B1 (en) * | 2019-11-13 | 2021-04-02 | 엘브이아이테크놀러지 (주) | Laser Equipment for Outputting Multi-Pulse Width |
| CN114447742A (en) * | 2022-02-07 | 2022-05-06 | 深圳市辉宏激光科技有限公司 | Femtosecond laser regenerative amplifier based on disc gain medium |
| CN216981120U (en) * | 2022-04-08 | 2022-07-15 | 深圳市辉宏激光科技有限公司 | Disc medium high-energy ultrashort pulse laser regeneration amplifier based on CPA technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102235631B1 (en) * | 2019-11-13 | 2021-04-02 | 엘브이아이테크놀러지 (주) | Laser Equipment for Outputting Multi-Pulse Width |
| CN111716004A (en) * | 2020-06-19 | 2020-09-29 | 西安交通大学 | Femtosecond-nanosecond ultra-pulse laser leveling processing system for ceramic matrix composite material |
| CN114447742A (en) * | 2022-02-07 | 2022-05-06 | 深圳市辉宏激光科技有限公司 | Femtosecond laser regenerative amplifier based on disc gain medium |
| CN216981120U (en) * | 2022-04-08 | 2022-07-15 | 深圳市辉宏激光科技有限公司 | Disc medium high-energy ultrashort pulse laser regeneration amplifier based on CPA technology |
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