CN114552356B - Device for converting periodic laser short pulse into random waveform long pulse or pulse cluster - Google Patents
Device for converting periodic laser short pulse into random waveform long pulse or pulse cluster Download PDFInfo
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- CN114552356B CN114552356B CN202210134712.7A CN202210134712A CN114552356B CN 114552356 B CN114552356 B CN 114552356B CN 202210134712 A CN202210134712 A CN 202210134712A CN 114552356 B CN114552356 B CN 114552356B
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- 238000007493 shaping process Methods 0.000 claims abstract description 10
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 43
- 239000000835 fiber Substances 0.000 claims description 34
- 230000008878 coupling Effects 0.000 claims description 12
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 6
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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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
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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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
- H01S3/10—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
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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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
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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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
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2308—Amplifier arrangements, e.g. MOPA
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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
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0057—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for temporal shaping, e.g. pulse compression, frequency chirping
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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
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
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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
- H01S5/00—Semiconductor lasers
- H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
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Abstract
The invention relates to the technical field of laser pulse shaping, and provides a device for converting periodic laser short pulses into random waveform long pulses or pulse clusters, which comprises an annular cavity, a periodic pulse laser, a beam splitter, a pulse intensity modulator, a coupler, a pulse amplifier and an optical switch, wherein the coupler, the pulse amplifier and the optical switch are arranged on the periphery of the annular cavity, and the optical pulse detector, the trigger signal generating circuit and the optical switch driver are electrically connected in sequence; the optical splitter is arranged on an output optical path of the pulse laser, the pulse intensity modulator and the optical pulse detector are respectively arranged on a first output optical path and a second output optical path of the optical splitter, the coupler is arranged on the output optical path of the pulse intensity modulator, and a first output end and a second output end of the optical switch are respectively arranged in and outside the annular cavity; the optical switch driver is electrically connected with the optical switch. The invention can convert periodic short laser pulse into random waveform long pulse or pulse cluster, greatly reduces the requirement on the accuracy of the integral driving circuit, and has the advantages of full optical fiber, stable operation and simple operation.
Description
Technical Field
The invention relates to the technical field of laser pulse shaping, in particular to a device for converting periodic laser short pulses into random waveform long pulses or pulse clusters.
Background
The current common optical pulse shaping technology depends on high-precision electric driving technology, including using an electro-optical modulator, an acousto-optic modulator and other intensity modulators to perform time-domain modulation on the intensity of long pulses, or directly using arbitrary waveform electric driving pulse current to drive a semiconductor laser to generate long pulse output with corresponding waveforms. The driving precision of these modes depends on the precision of the electric driving device, and can only be applied to the generation of arbitrary waveform light pulses in the order of tens of nanoseconds to sub-microseconds, and cannot meet the requirement of certain current applications on shorter arbitrary waveform laser pulses. Therefore, a new arbitrary waveform pulse synthesis technique is required that can generate shorter arbitrary waveform laser pulses without depending on high-precision electric drive equipment.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a device for converting periodic short laser pulses into random waveform long pulses or pulse clusters, which can convert periodic short laser pulses into random waveform long pulses or pulse clusters, greatly reduces the requirement on the precision of a whole-shape driving circuit, and has the advantages of full optical fiber, stable operation and simple operation.
The technical scheme of the invention is as follows:
The device for converting periodic laser short pulses into random waveform long pulses or pulse clusters is characterized by comprising a ring cavity (1), a periodic pulse laser (2), an optical splitter (11), a pulse intensity modulator (3), a coupler (4), a pulse amplifier (5), an optical switch (6), an optical pulse detector (8), a trigger signal generation circuit (9) and an optical switch driver (10);
The optical splitter (11) is arranged on an output optical path of the periodic pulse laser (2), the pulse intensity modulator (3) is arranged on a first output optical path of the optical splitter (11), the coupler (4), the pulse amplifier (5) and the optical switch (6) are sequentially arranged on the circumference of the annular cavity (1), the coupler (4) is arranged on the output optical path of the pulse intensity modulator (3), and a first output end of the optical switch (6) is arranged inside the annular cavity (1) and a second output end of the optical switch (6) is arranged outside the annular cavity (1);
The optical pulse detector (8) is arranged on a second output optical path of the optical splitter (11), the output end of the optical pulse detector (8) is electrically connected with the input end of the trigger signal generation circuit (9), the output end of the trigger signal generation circuit (9) is electrically connected with the input end of the optical switch driver (10), and the output end of the optical switch driver (10) is electrically connected with the electric drive port of the optical switch (6).
Further, an optical delay line (7) is arranged between the optical switch (6) and the coupler (4) in the circumferential direction of the annular cavity (1).
Furthermore, the annular cavity (1) is a space optical loop formed by a reflector group.
Further, the annular cavity (1) is an all-fiber annular cavity formed by sequentially connecting a coupler (4), a pulse amplifier (5), an optical switch (6), an optical delay line (7) and the coupler (4) through optical fibers, the output end of the coupler (4) is connected with the input end of the pulse amplifier (5) through optical fibers, the output end of the pulse amplifier (5) is connected with the optical input end of the optical switch (6) through optical fibers, the first output end of the optical switch (6) is connected with the input end of the optical delay line (7) through optical fibers, and the output end of the optical delay line (7) is connected with the input end of the coupler (4) through optical fibers.
Further, the periodic pulse laser (2) is used for generating periodic laser pulses and sending a laser pulse sequence to the beam splitter (11), and the beam splitter (11) is used for splitting the received laser pulse sequence and sending the split laser pulse sequence to the pulse intensity modulator (3) through a first output light path and to the light pulse detector (8) through a second output light path respectively;
The pulse intensity modulator (3) is used for modulating the intensity of the received laser pulse sequence to realize pre-shaping, and sending the pre-shaped laser pulse sequence into the coupler (4); the coupler (4) is used for coupling the laser pulse sequence received from the pulse intensity modulator (3) and the laser pulse sequence received from the optical delay line (7), and the coupled laser pulse sequence enters the pulse amplifier (5); the pulse amplifier (5) is used for amplifying the received laser pulse sequence; the amplified laser pulse sequence enters the optical switch (6) through the optical input end of the optical switch (6) and is output from the first output end of the optical switch (6), and then enters the optical delay line (7); the optical delay line (7) is used for controlling the cavity length of the annular cavity (1) by adjusting the delay amount so as to control the time domain interval when the laser pulse sequence input into the annular cavity (1) circulates in the annular cavity (1); when the time domain interval at the time of the circulation is smaller than the pulse width, the coupler (4) outputs laser pulses longer than the laser pulse sequence sent by the pulse intensity modulator (3) in a combined mode; when the time domain interval of the circulating laser pulse is larger than the pulse width but smaller than the time domain interval of the laser pulse sequence sent by the pulse intensity modulator (3), the coupler (4) synthesizes and outputs laser pulse clusters;
The optical pulse detector (8) is used for detecting laser pulses on a second output optical path of the optical splitter (11), generating an electric pulse signal when the laser pulses are detected, and transmitting the electric pulse signal to the trigger signal generating circuit (9); the trigger signal generating circuit (9) is used for generating trigger signals at intervals of n electric pulse signals and transmitting the trigger signals to the optical switch driver (10); the optical switch driver (10) is used for controlling the first output end of the optical switch (6) to be closed and the second output end to be opened when the trigger signal is received, so that the laser pulse or the pulse cluster synthesized after the internal circulation of the annular cavity (1) is in a certain period is output to the annular cavity (1) through the second output end of the optical switch (6); the optical switch driver (10) is used for controlling the first output end and the second output end of the optical switch (6) to be opened and the second output end to be closed when the trigger signal is not received, so that laser pulses circulate in the annular cavity (1).
Furthermore, the periodic pulse laser (2) is a pulse modulated semiconductor laser or a mode-locked fiber laser, the pulse intensity modulator (3) is an electro-optic modulator or an acousto-optic modulator, the coupler (4) is a spatial coupling spectroscope or a fiber-optic coupling device, and the pulse amplifier (5) comprises a pump source, a gain medium, a wavelength division multiplexer or a dichroic mirror or a pump-signal beam combiner.
Further, the pulse intensity modulator (3) is an all-fiber electro-optic modulator or an acousto-optic modulator with optical fiber coupling, the coupler (4) is an all-fiber 50:50 split ratio coupler, the pulse amplifier (5) comprises a pumping source, a gain fiber and an all-fiber wavelength division multiplexer or an all-fiber pumping-signal beam combiner with optical fiber output, the optical switch (6) is an all-fiber 1×2 optical switch with optical fiber coupling, and the optical delay line (7) is an all-fiber optical delay line.
The beneficial effects of the invention are as follows:
The pulse intensity modulator is arranged before the laser pulse is input into the annular cavity, so that the laser pulse can be pre-shaped on a larger time scale, the pulse amplifier is added into the annular cavity, the laser pulse can be amplified, the pulse intensity modulator and the pulse amplifier control the waveform of the laser pulse together, and the generation of the laser pulse with any waveform is realized; the coupler and the optical delay line are arranged in the circumferential direction of the annular cavity, so that the cavity length of the annular cavity is controlled by controlling the delay amount of the optical delay line, and the time domain interval of a laser pulse sequence input into the annular cavity when circulating in the annular cavity is controlled, so that longer laser pulses or laser pulse clusters are synthesized through the coupler; the invention is provided with the optical pulse detector, the trigger signal generating circuit, the optical switch driver and the optical switch in the annular cavity, so that when n laser pulses are detected, the second output end of the optical switch is controlled to be opened by the optical switch driver, and the laser pulses or pulse clusters synthesized after the annular cavity circulates for a certain period are discharged out of the annular cavity. The pulse synthesis technology can convert periodic short laser pulses into long pulses or pulse clusters with arbitrary waveforms, greatly reduces the requirement on the accuracy of the integral driving circuit, and has the advantages of full optical fiber, stable operation and simple operation.
Drawings
Fig. 1 is a schematic diagram of a device for converting periodic laser short pulses into random waveform long pulses or pulse clusters according to the present invention.
In the figure, a 1-ring cavity, a 2-periodic pulse laser, a 3-pulse intensity modulator, a 4-coupler, a 5-pulse amplifier, a 6-optical switch, a 7-optical delay line, an 8-optical pulse detector, a 9-trigger signal generating circuit, a 10-optical switch driver and an 11-optical splitter are shown.
Detailed Description
The invention will be further described with reference to the drawings and detailed description.
As shown in fig. 1, the device for converting periodic laser short pulses into random waveform long pulses or pulse clusters comprises a ring cavity 1, a periodic pulse laser 2, a beam splitter 11, a pulse intensity modulator 3, a coupler 4, a pulse amplifier 5, an optical switch 6, an optical pulse detector 8, a trigger signal generating circuit 9 and an optical switch driver 10.
The optical splitter 11 is arranged on the output optical path of the periodic pulse laser 2, the pulse intensity modulator 3 is arranged on the first output optical path of the optical splitter 11, the coupler 4, the pulse amplifier 5 and the optical switch 6 are sequentially arranged on the circumference of the annular cavity 1, the coupler 4 is arranged on the output optical path of the pulse intensity modulator 3, and the first output end of the optical switch 6 is arranged inside the annular cavity 1, and the second output end of the optical switch 6 is arranged outside the annular cavity 1.
The optical pulse detector 8 is disposed on the second output optical path of the optical splitter 11, an output end of the optical pulse detector 8 is electrically connected with an input end of the trigger signal generating circuit 9, an output end of the trigger signal generating circuit 9 is electrically connected with an input end of the optical switch driver 10, and an output end of the optical switch driver 10 is electrically connected with an electric driving port of the optical switch 6.
The annular cavity 1 can be a space optical loop formed by a reflector group, and can also be an all-fiber annular cavity formed by all elements in a fiber connection cavity. When the annular cavity 1 is a space optical loop formed by a reflector group, an optical delay line 7 may be disposed between the optical switch 6 and the coupler 4 in the circumferential direction of the annular cavity 1, or the optical delay line 7 may not be disposed, that is, the optical delay line 7 is not an essential component. When the annular cavity 1 is an all-fiber annular cavity formed by the elements in the fiber connection cavity, an optical delay line 7 is an essential component and is arranged between the optical switch 6 and the coupler 4 circumferentially of the annular cavity 1.
The periodic pulse laser 2 is used for generating periodic laser pulses and sending a laser pulse sequence to the beam splitter 11, and the beam splitter 11 is used for splitting the received laser pulse sequence and sending the split laser pulse sequence to the pulse intensity modulator 3 through a first output light path and to the optical pulse detector 8 through a second output light path respectively;
the pulse intensity modulator 3 is used for modulating the intensity of the received laser pulse sequence to realize pre-shaping, and sending the pre-shaped laser pulse sequence into the coupler 4; the coupler 4 is used for coupling the laser pulse sequence received from the pulse intensity modulator 3 and the laser pulse sequence received from the optical delay line 7, and the coupled laser pulse sequence enters the pulse amplifier 5; the pulse amplifier 5 is used for amplifying the received laser pulse sequence; the amplified laser pulse sequence enters the optical switch 6 through the optical input end of the optical switch 6 and is output from the first output end of the optical switch 6, and then enters the optical delay line 7; the optical delay line 7 is used for controlling the cavity length of the annular cavity 1 by adjusting the delay amount so as to control the time domain interval of the laser pulse sequence input into the annular cavity 1 when circulating in the annular cavity 1; when the time domain interval at the time of the cycle is smaller than the pulse width, the coupler 4 synthesizes and outputs laser pulses longer than the laser pulse sequence sent by the pulse intensity modulator 3; when the time domain interval of the cyclic time is larger than the pulse width but smaller than the time domain interval of the laser pulse sequence sent by the pulse intensity modulator 3, the coupler 4 synthesizes and outputs laser pulse clusters;
The optical pulse detector 8 is configured to detect a laser pulse on the second output optical path of the optical splitter 11, generate an electrical pulse signal when the laser pulse is detected, and transmit the electrical pulse signal to the trigger signal generating circuit 9; the trigger signal generating circuit 9 is used for generating trigger signals at intervals of n electric pulse signals and transmitting the trigger signals to the optical switch driver 10; the optical switch driver 10 is configured to control, when receiving the trigger signal, the first output end of the optical switch 6 to be closed and the second output end to be opened, so that the laser pulse or the pulse cluster synthesized after the internal circulation of the annular cavity 1 for a certain period outputs the annular cavity 1 through the second output end of the optical switch 6; the optical switch driver 10 is configured to control the first output terminal of the optical switch 6 to be turned on and the second output terminal to be turned off when the trigger signal is not received, so that the laser pulse circulates inside the annular cavity 1.
The periodic pulse laser 2 may be a pulse modulated semiconductor laser or a mode-locked fiber laser, or may be other lasers capable of generating periodic light pulses; the pulse intensity modulator 3 is an electro-optic modulator or an acousto-optic modulator, preferably an all-fiber electro-optic modulator or an acousto-optic modulator coupled by optical fibers; the coupler 4 is a spatial coupling spectroscope or a fiber-optic coupling device; the pulse amplifier 5 comprises a pump source, a gain medium and a wavelength division multiplexer or a dichroic mirror or a pump-signal combiner, preferably a pump source for optical fiber output, a gain fiber and an all-fiber wavelength division multiplexer or an all-fiber pump-signal combiner.
In this embodiment, the annular cavity 1 is an all-fiber annular optical resonant cavity formed by sequentially connecting the coupler 4, the pulse amplifier 5, the optical switch 6, the optical delay line 7 and the coupler 4 through optical fibers. The output end of the coupler 4 is connected with the input end of the pulse amplifier 5 through an optical fiber, the output end of the pulse amplifier 5 is connected with the optical input end of the optical switch 6 through an optical fiber, the first output end of the optical switch 6 is connected with the input end of the optical delay line 7 through an optical fiber, and the output end of the optical delay line 7 is connected with the input end of the coupler 4 through an optical fiber.
In this embodiment, the periodic pulse laser 2 is an ytterbium-doped mode-locked fiber laser, and outputs a laser pulse sequence with a wavelength band of 1.06 micrometers; the pulse intensity modulator 3 is an all-fiber electro-optic modulator with optical fiber coupling, the coupler 4 is an all-fiber 50:50 split ratio coupler, the pulse amplifier 5 comprises a semiconductor laser pumping source with 980 nm wavelength optical fiber output, an ytterbium-doped gain optical fiber and an all-fiber 980/1060nm wavelength division multiplexer, the optical switch 6 is an all-fiber 1×2 optical switch with optical fiber coupling, the optical delay line 7 is an all-fiber optical delay line, and the optical fiber used for connection is a single-mode optical fiber.
Different from the thought of the existing pulse shaping technology, the invention uses the thought of pulse synthesis to realize the generation of laser pulses with arbitrary waveform by referencing the thought of the regeneration cavity, and can also generate laser pulse clusters through parameter control. The basic idea of the regeneration cavity is to control the optical path of the annular cavity to be matched with the period of the periodic pulse by circulating the periodic laser pulse in the optical annular cavity, so that the laser pulses can be mutually overlapped in the annular cavity, and after being overlapped to a certain period, the overlapped pulses are emitted out of the annular cavity through the optical switch, thereby realizing the passive gain of pulse energy and reducing the pulse repetition frequency.
The core idea of the invention is to control the optical path of the annular cavity and the period mismatch of the periodic pulses on the basis of the regeneration cavity, so that the periodic laser pulses are arranged in parallel in the annular cavity in a time domain without gaps, but not overlapped with each other, and the periodic short laser pulses are arranged in parallel in the time domain to be synthesized into longer laser pulses. By pre-shaping the periodic laser pulses over a large time scale before being input into the ring cavity, the pre-shaping result is reflected in the resultant optical pulses output by the ring cavity, and a pulse amplifier is also added to the ring cavity, the pre-shaping and the pulse amplifier together controlling the waveform of the resultant optical pulses output. Specifically, the pulse intensity modulator 3 is arranged before the laser pulse is input into the annular cavity 1, so that the laser pulse can be pre-shaped on a larger time scale, the pulse amplifier 5 is added into the annular cavity 1, the laser pulse can be amplified, and the pulse intensity modulator 3 and the pulse amplifier 5 jointly control the waveform of the laser pulse, so that the generation of the laser pulse with any waveform is realized; the coupler 4 and the optical delay line 7 are arranged in the circumferential direction of the annular cavity 1, so that the cavity length of the annular cavity 1 is controlled by controlling the delay amount of the optical delay line 7, and the time domain interval of a laser pulse sequence input into the annular cavity 1 when circulating in the annular cavity 1 is controlled, so that longer laser pulses or laser pulse clusters can be synthesized through the coupler 4; the invention is provided with the optical pulse detector 8, the trigger signal generating circuit 9, the optical switch driver 10 and the optical switch 6 in the annular cavity 1, so that when n laser pulses are detected, the second output end of the optical switch 6 is controlled to be opened by the optical switch driver 10, and the laser pulses or pulse clusters synthesized after a certain period of circulation in the annular cavity 1 are discharged out of the annular cavity 1.
The pulse synthesis technology can convert periodic short laser pulses into long pulses or pulse clusters with arbitrary waveforms, greatly reduces the requirement on the accuracy of the integral driving circuit, and has the advantages of full optical fiber, stable operation and simple operation. Specifically, the invention generates the random waveform pulse by combining a plurality of short pulses in the short pulse sequence to generate a longer pulse, wherein the generation of the longer pulse refers to the conversion of the generated random waveform pulse to be longer than the input short pulse. The arbitrary waveform pulse generated by the conversion device is shorter in pulse width than the arbitrary waveform pulse generated by the prior art, and the requirement of certain current applications on the shorter arbitrary waveform laser pulse can be met without depending on high-precision electric driving equipment.
It should be apparent that the above-described embodiments are merely some, but not all, embodiments of the present application. The above examples are only for explaining the present application and do not limit the scope of the present application. Based on the above embodiments, all other embodiments obtained by those skilled in the art without making creative efforts, i.e., all modifications, equivalents, improvements etc., which are within the spirit and principles of the present application, fall within the protection scope of the present application as claimed.
Claims (5)
1. The device for converting periodic laser short pulses into random waveform long pulses or pulse clusters is characterized by comprising a ring cavity (1), a periodic pulse laser (2), an optical splitter (11), a pulse intensity modulator (3), a coupler (4), a pulse amplifier (5), an optical switch (6), an optical pulse detector (8), a trigger signal generation circuit (9) and an optical switch driver (10);
The optical splitter (11) is arranged on an output optical path of the periodic pulse laser (2), the pulse intensity modulator (3) is arranged on a first output optical path of the optical splitter (11), the coupler (4), the pulse amplifier (5) and the optical switch (6) are sequentially arranged on the circumference of the annular cavity (1), the coupler (4) is arranged on the output optical path of the pulse intensity modulator (3), and a first output end of the optical switch (6) is arranged inside the annular cavity (1) and a second output end of the optical switch (6) is arranged outside the annular cavity (1);
The optical pulse detector (8) is arranged on a second output optical path of the optical splitter (11), the output end of the optical pulse detector (8) is electrically connected with the input end of the trigger signal generation circuit (9), the output end of the trigger signal generation circuit (9) is electrically connected with the input end of the optical switch driver (10), and the output end of the optical switch driver (10) is electrically connected with the electric drive port of the optical switch (6);
An optical delay line (7) is arranged between the optical switch (6) and the coupler (4) in the circumferential direction of the annular cavity (1);
the periodic pulse laser (2) is used for generating periodic laser pulses and sending a laser pulse sequence to the beam splitter (11), and the beam splitter (11) is used for splitting the received laser pulse sequence and sending the split laser pulse sequence to the pulse intensity modulator (3) through a first output light path and to the optical pulse detector (8) through a second output light path respectively;
The pulse intensity modulator (3) is used for modulating the intensity of the received laser pulse sequence to realize pre-shaping, and sending the pre-shaped laser pulse sequence into the coupler (4); the coupler (4) is used for coupling the laser pulse sequence received from the pulse intensity modulator (3) and the laser pulse sequence received from the optical delay line (7), and the coupled laser pulse sequence enters the pulse amplifier (5); the pulse amplifier (5) is used for amplifying the received laser pulse sequence; the amplified laser pulse sequence enters the optical switch (6) through the optical input end of the optical switch (6) and is output from the first output end of the optical switch (6), and then enters the optical delay line (7); the optical delay line (7) is used for controlling the cavity length of the annular cavity (1) by adjusting the delay amount so as to control the time domain interval when the laser pulse sequence input into the annular cavity (1) circulates in the annular cavity (1); when the time domain interval at the time of the circulation is smaller than the pulse width, the coupler (4) outputs laser pulses longer than the laser pulse sequence sent by the pulse intensity modulator (3) in a combined mode; when the time domain interval of the circulating laser pulse is larger than the pulse width but smaller than the time domain interval of the laser pulse sequence sent by the pulse intensity modulator (3), the coupler (4) synthesizes and outputs laser pulse clusters;
The optical pulse detector (8) is used for detecting laser pulses on a second output optical path of the optical splitter (11), generating an electric pulse signal when the laser pulses are detected, and transmitting the electric pulse signal to the trigger signal generating circuit (9); the trigger signal generating circuit (9) is used for generating trigger signals at intervals of n electric pulse signals and transmitting the trigger signals to the optical switch driver (10); the optical switch driver (10) is used for controlling the first output end of the optical switch (6) to be closed and the second output end to be opened when the trigger signal is received, so that the laser pulse or the pulse cluster synthesized after the internal circulation of the annular cavity (1) is in a certain period is output to the annular cavity (1) through the second output end of the optical switch (6); the optical switch driver (10) is used for controlling the first output end and the second output end of the optical switch (6) to be opened and the second output end to be closed when the trigger signal is not received, so that laser pulses circulate in the annular cavity (1).
2. The device for converting periodic laser short pulses into random-waveform long pulses or pulse clusters according to claim 1, characterized in that the annular cavity (1) is a spatial optical loop formed by a mirror group.
3. The device for converting periodic laser short pulses into random waveform long pulses or pulse clusters according to claim 1, wherein the annular cavity (1) is an all-fiber annular cavity formed by sequentially connecting the coupler (4), the pulse amplifier (5), the optical switch (6), the optical delay line (7) and the coupler (4) through optical fibers, the output end of the coupler (4) is connected with the input end of the pulse amplifier (5) through optical fibers, the output end of the pulse amplifier (5) is connected with the optical input end of the optical switch (6) through optical fibers, the first output end of the optical switch (6) is connected with the input end of the optical delay line (7) through optical fibers, and the output end of the optical delay line (7) is connected with the input end of the coupler (4) through optical fibers.
4. The device for converting periodic laser short pulses into random waveform long pulses or pulse clusters according to claim 1, characterized in that the periodic pulse laser (2) is a pulse modulated semiconductor laser or a mode-locked fiber laser, the pulse intensity modulator (3) is an electro-optical modulator or an acousto-optical modulator, the coupler (4) is a spatially coupled spectroscope or a fiberized coupling device, and the pulse amplifier (5) comprises a pump source, a gain medium and a wavelength division multiplexer or a dichroic mirror or a pump-signal combiner.
5. The device for converting periodic laser short pulses into pulses or pulse clusters with arbitrary waveform length according to claim 4, wherein the pulse intensity modulator (3) is an all-fiber electro-optic modulator or an acousto-optic modulator coupled by optical fibers, the coupler (4) is an all-fiber 50:50 split ratio coupler, the pulse amplifier (5) comprises a pump source for optical fiber output, a gain fiber and an all-fiber wavelength division multiplexer or an all-fiber pump-signal combiner, the optical switch (6) is an all-fiber 1 x2 optical switch coupled by optical fibers, and the optical delay line (7) is an all-fiber optical delay line.
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