CN113644535B - Chaotic pulse laser - Google Patents
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- CN113644535B CN113644535B CN202110721186.XA CN202110721186A CN113644535B CN 113644535 B CN113644535 B CN 113644535B CN 202110721186 A CN202110721186 A CN 202110721186A CN 113644535 B CN113644535 B CN 113644535B
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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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
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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
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
Abstract
The invention relates to a chaotic pulse laser, which comprises a pulse driving source and a temperature controller, wherein the pulse driving source provides square wave pulse current for a 1064nm laser diode; an external all-optical feedback cavity consisting of a rotatable half-wave plate, a polarization beam splitter prism and a total reflector is used for interfering the laser secondary light tube so as to generate chaotic pulse laser; the beam shaping device is used for collimating and shaping the laser beam; and a chaotic pulse laser amplifier consisting of an optical isolator and Nd-YAG gain medium with an LD array, and finally outputting 532nm high-power chaotic pulse laser through a frequency doubling crystal. The invention has the advantages that the high-power chaotic pulse laser with the wavelength of 532nm adopts the design of space optical feedback and rear-end power amplification, and has the advantages of simple structure, good compatibility with other optical devices and complex dynamic behavior. And secondly, the chaotic pulse laser has excellent capability of inhibiting the backward scattering of the water body.
Description
Technical Field
The invention relates to the technical field of semiconductor lasers, in particular to a chaotic pulse laser.
Background
The chaotic signal is a noise-like signal generated by a deterministic system and has good autocorrelation and cross-correlation characteristics. As a radar waveform, the broadband chaotic signal has a pin type fuzzy function, good distance, speed resolution and low interception probability, so the broadband chaotic signal is an ideal signal for radar application.
The semiconductor laser is very sensitive to external perturbation due to inherent characteristics of materials and structures used by the semiconductor laser, is easy to generate nonlinear dynamic output, and has very abundant dynamic behaviors. In the absence of external disturbances, when the injection current exceeds a threshold value (satisfying the lasing condition), the output of the semiconductor laser undergoes a short-time relaxation oscillation, and the system quickly reaches a steady state. The nonlinear dynamic output of the semiconductor laser can be realized only by adding one degree of freedom in the semiconductor laser. At present, there are 4 basic methods for increasing the degree of freedom to make a semiconductor laser generate nonlinear dynamic output: current modulation, external light injection, opto-electronic feedback, and all-optical feedback.
However, the current research is mainly continuous chaotic laser output, and the wavelength is mainly infrared band, so that the chaotic laser spatial ranging method can be used for chaotic secret communication, chaotic laser spatial ranging and other aspects. However, for underwater laser ranging, the chaotic laser of the blue-green wave band needs to be researched; secondly, for carrying out underwater long-distance ranging, pulse laser can detect a longer distance compared with continuous laser under the same power consumption; in addition, in order to realize the underwater long-distance transmission of the chaotic laser, an amplifying device is required to be added at the rear end of the chaotic pulse laser generated by the laser diode, so that the output of the high-power chaotic pulse laser is realized.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and the chaotic pulse laser is provided, so that chaotic pulse laser with excellent capability of inhibiting backward scattering of a water body is generated.
The technical scheme of the invention is as follows: a chaotic pulse laser comprises a pulse driving source, a temperature controller, a 1064nm laser diode and a beam shaping device;
the pulse driving source is used for outputting square wave pulse modulation current;
the 1064nm laser diode generates 1064nm pulse laser under the excitation of square wave pulse modulation current, records the pulse laser as first pulse laser, receives the pulse laser returned by the optical feedback cavity, records the pulse laser as second pulse laser, and the second pulse laser forms interference on the first pulse laser, thereby generating 1064nm chaotic pulse laser;
the temperature controller is used for controlling the temperature of the 1064nm laser diode within a preset range;
the beam shaping device is used for shaping and collimating the first pulse laser output by the 1064nm laser diode; receiving the second pulse laser fed back by the optical feedback cavity and outputting the second pulse laser to a 1064nm laser diode;
and the optical feedback cavity is used for reflecting the first pulse laser along the original path to obtain second pulse laser.
Preferably, the optical feedback cavity comprises a rotatable half-wave plate, a polarization splitting prism and a total reflection mirror;
the rotatable half-wave plate, the polarization beam splitting prism and the total reflection mirror are sequentially arranged on a light path of a light beam output by the light beam shaping device, pulse laser output by the light beam shaping device enters the polarization beam splitting prism through the rotatable half-wave plate, the polarization beam splitting prism transmits and reflects the light beam, reflected light enters the total reflection mirror, the pulse laser totally reflected by the total reflection mirror is fed back, and the pulse laser returns to the light beam shaping device through the polarization beam splitting prism and the rotatable half-wave plate;
the rotating half-wave plate is used for controlling the intensity ratio of the transmitted light to the reflected light of the polarization beam splitter prism, and the intensity ratio of the transmitted light to the reflected light is controlled within a certain range by finely adjusting the rotating half-wave plate, so that the 1064nm laser diode generates 1064nm chaotic pulse laser output.
The high-power chaotic pulse laser also comprises a chaotic pulse laser amplifier, wherein the chaotic pulse laser amplifier comprises an optical isolator and an Nd-YAG gain medium with an LD array;
YAG gain medium is placed on the light path of the transmission output light beam of the polarization beam splitter prism in sequence, 1064nm chaotic pulse laser transmitted and output from the polarization beam splitter prism passes through the optical isolator and enters the Nd, YAG gain medium to amplify the power of the chaotic pulse laser and output high-power 1064nm chaotic pulse laser;
and the optical isolator is used for isolating the return of the laser beam entering the Nd: YAG gain medium, and the gain medium is used for amplifying the power of the chaotic pulse laser.
The high-power chaotic pulse laser also comprises a frequency doubling crystal;
the frequency doubling crystal is placed on a light path of a light beam output by the gain medium, and the 1064nm chaotic pulse laser is converted into 532nm chaotic pulse laser.
Preferably, the square wave pulse modulation current intensity is 1.2-2.5 times of the threshold current of the laser diode by taking the threshold current of the laser diode as a reference, the frequency is not higher than 20MHz, and the duty ratio is 40-60%.
Preferably, the extinction ratio of the polarization splitting prism 6 is greater than or equal to 1000: 1.
Preferably, the laser output port of the 1064nm laser diode is positioned at the focus of the beam shaping device.
Preferably, the distance between the polarization beam splitter prism and the total reflection mirror is set to be 10-50 mm.
Preferably, the pulse period of the square wave pulse modulation current is less than or equal to the delay time of the pulse laser beam output by the 1064nm laser diode, which is fed back through the beam shaping device and the optical feedback cavity and reaches the 1064nm laser diode again.
Preferably, the adjustment method of the spinning half-wave plate is as follows:
s1, placing the photoelectric detector at the front side of the polarization beam splitter prism, namely the laser output direction, wherein the output end of the photoelectric detector is connected with an oscilloscope, and the oscilloscope is used for observing the time domain waveform of the output laser;
s2, rotating the half-wave plate to enable the feedback intensity to be 0, and observing the first pulse laser through an oscilloscope;
s3, finely adjusting the half-wave plate towards a certain direction to gradually increase the feedback intensity, observing that the top end of the originally smooth square wave pulse generates noise-like jitter from an oscilloscope when the feedback intensity slowly increases to a certain intensity, and advancing the step S4;
s4, finely adjusting the half-wave plate according to the feedback intensity, and finding out the position with the maximum jitter amplitude, wherein the output is the 'macro-pulse' chaotic laser with the maximum power.
Compared with the prior art, the invention has the beneficial effects that:
(1) the high-power chaotic pulse laser provided by the invention outputs chaotic pulse laser in a space light external cavity feedback mode, and has the characteristics of compact structure and high conversion efficiency, wherein the external cavity is formed by a half-wave plate, a polarization beam splitter prism and a total reflection mirror;
(2) the pulse laser generated by a 1064nm laser diode modulated by a square wave pulse driving source is reflected in a cavity and enters the laser diode to generate interference, the interference degree (feedback intensity) is adjusted by rotating a half-wave plate, when the feedback intensity is appropriate, "chaotic pulse laser output" is generated, namely, the system generates complex dynamic change by controlling external parameters (feedback intensity, time and the like) of a semiconductor laser, and finally enters a chaotic state, and the output of high-power chaotic pulse laser is realized by a laser amplifier.
(3) Compared with current modulation, external light injection and photoelectric feedback modes, the chaotic laser generated by the space optical external cavity all-optical feedback mode has the characteristics of simple structure, good compatibility with other optical devices and the like, is complex in dynamic behavior, and greatly expands the application of the chaotic semiconductor laser in underwater distance measurement.
Drawings
Fig. 1 is a schematic structural diagram of a high-power chaotic pulse laser according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Fig. 1 shows a structure of a high-power chaotic pulse laser according to the present invention. As shown in fig. 1, the laser includes: the laser comprises a pulse drive source 1, a temperature controller 2, a 488nm laser diode 3, a beam shaping device 4, a rotatable half-wave plate 5, a polarization beam splitter prism 6, a total reflection mirror 7, an optical isolator 8, an Nd: YAG gain medium 9 with an LD array and a frequency doubling crystal 10.
A pulse drive source 1 for outputting a square wave pulse modulated current;
the 1064nm laser diode 3 is used for generating 1064nm pulse laser under the excitation of square wave pulse modulation current, marking the pulse laser as first pulse laser, receiving the pulse laser returned by the optical feedback cavity, marking the pulse laser as second pulse laser, and enabling the second pulse laser to form interference on the first pulse laser, so that 1064nm chaotic pulse laser is generated;
and the temperature controller 2 is used for controlling the temperature of the 1064nm laser diode 3 to be within a preset range, and the temperature range of the 1064nm laser diode 3 is 20-25 degrees.
The beam shaping device 4 is used for shaping and collimating the first pulse laser output by the 1064nm laser diode 3; the second pulse laser fed back by the optical feedback cavity is received and output to a 1064nm laser diode (3);
and the optical feedback cavity is used for reflecting the first pulse laser along the original path to obtain second pulse laser.
The optical feedback cavity comprises a rotatable half-wave plate 5, a polarization beam splitter prism 6 and a total reflection mirror 7;
the rotatable half-wave plate 5, the polarization beam splitter prism 6 and the total reflection mirror 7 are sequentially arranged on a light path of a light beam output by the light beam shaping device 4, pulse laser output by the light beam shaping device 4 passes through the rotatable half-wave plate 5 and enters the polarization beam splitter prism 6, the polarization beam splitter prism 6 transmits and reflects the light beam, reflected light enters the total reflection mirror 7, the pulse laser totally reflected by the total reflection mirror 7 is fed back, and the pulse laser passes through the polarization beam splitter prism 6 and the rotatable half-wave plate 5 and returns to the light beam shaping device 4.
The rotating half-wave plate 5 is used for controlling the intensity ratio of the transmitted light to the reflected light of the polarization beam splitter prism 6, and the intensity ratio of the transmitted light to the reflected light is controlled within a certain range by finely adjusting the rotating half-wave plate 5, so that the 1064nm laser diode 3 generates 1064nm chaotic pulse laser output.
The optical isolator 8 and the Nd: YAG gain medium 9 with the LD array form the chaotic pulse laser amplifier.
YAG gain medium 9 is sequentially placed on the light path of the transmission output light beam of the polarization beam splitter prism 6, and 1064nm chaotic pulse laser transmitted and output from the polarization beam splitter prism 6 passes through the optical isolator 8 and enters Nd, YAG gain medium 9 is used for amplifying the power of the chaotic pulse laser and outputting high-power 1064nm chaotic pulse laser;
and the optical isolator 8 is used for isolating the return of the laser beam entering the Nd: YAG gain medium 9, and the gain medium 9 is used for realizing the amplification of the chaotic pulse laser power.
The frequency doubling crystal 10 is placed on a light path of a light beam output by the gain medium 9, and converts the 1064nm chaotic pulse laser into a 532nm chaotic pulse laser.
The square wave pulse modulation current intensity takes the threshold current of the laser diode as reference, is 1.2-2.5 times of the threshold current of the laser diode, the frequency is not higher than 20MHz, and the duty ratio is 40% -60%.
The extinction ratio of the polarization beam splitter prism 6 is greater than or equal to 1000: 1.
The reflectivity of the total reflection mirror is greater than 96% @1064 nm.
The laser output port of the 1064nm laser diode 3 is located at the focus of the beam shaping device 4.
The distance between the polarization beam splitter prism 6 and the total reflection mirror 7 is set to be 10-50 mm.
The pulse period of the square wave pulse modulation current is less than or equal to the delay time of the pulse laser beam output by the 1064nm laser diode 3 which is fed back through the beam shaping device 4 and the optical feedback cavity and reaches the 1064nm laser diode 3 again.
The adjusting method of the rotating half-wave plate comprises the following steps:
s1, placing the photoelectric detector at the front side of the polarization beam splitter prism, namely the laser output direction, wherein the output end of the photoelectric detector is connected with an oscilloscope, and the oscilloscope is used for observing the time domain waveform of the output laser;
s2, rotating the half-wave plate to make the feedback intensity 0, and observing by an oscilloscope that the laser is the first pulse laser;
s3, finely adjusting the half-wave plate towards a certain direction to gradually increase the feedback intensity, when the feedback intensity is slowly increased to a certain intensity, seeing that the originally smooth top end of the square wave pulse generates noise-like jitter from an oscilloscope, and advancing to the step S4;
s4, finely adjusting the half-wave plate according to the feedback intensity, and finding out the position with the maximum jitter amplitude, wherein the output is the 'macro-pulse' chaotic laser with the maximum power.
Example (b):
in order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Fig. 1 shows a structure of a high-power chaotic pulse laser according to the present invention. As shown in fig. 1, the laser includes: the laser comprises a pulse drive source 1, a temperature controller 2, a 488nm laser diode 3, a beam shaping device 4, a rotatable half-wave plate 5, a polarization beam splitter prism 6, a total reflection mirror 7, an optical isolator 8, an Nd: YAG gain medium 9 with an LD array and a frequency doubling crystal 10.
The 1064nm laser diode 3 may be fixed on a matching mounting base, and the laser driving source 1 and the temperature controller 3 are connected to respective corresponding electrical interfaces on the mounting base, and are respectively used to provide the laser diode 3 with square-wave pulse modulation current and temperature control. The square wave pulse modulation current takes the threshold current of a laser diode as reference, and is generally 1.2-2.5 times of the threshold current, and the temperature is preferably controlled at 20 ℃ or 25 ℃. After the two are loaded on the laser diode, the conventional pulse laser output is obtained.
In order to obtain chaotic pulse laser output, an external cavity all-optical feedback technology is required. The external cavity of the light source consists of a rotatable half-wave plate 5, a polarization beam splitter prism 6 and a total reflector 7, wherein the extinction ratio of the polarization beam splitter prism is 1000:1, and the reflectivity of the total reflector is greater than 96% @488 nm. The feedback intensity is increased stepwise by first rotating the half-wave plate to 0 and then fine-tuning the half-wave plate in a certain direction. In the process, a detector is placed on the front side of the polarization splitting prism, namely the output direction of the laser, and the time domain waveform of the output laser is observed by an oscilloscope. When the feedback intensity is 0, the oscilloscope observes that the laser is the conventional square wave pulse laser; when the feedback intensity is slowly increased to a certain intensity, the oscillograph sees that the top end of the original smooth square wave pulse generates noise-like jitter, then the half-wave plate is finely adjusted in a small range of the feedback intensity, the position with the maximum jitter amplitude is found, and the output is the 'macro-pulse' chaotic laser with the maximum power. The distance between the polarization beam splitter prism 6 and the total reflection mirror 7 can be set to be 10-50 mm.
By adjusting the repetition frequency and duty ratio of the square wave generated by the pulse driving source 1, the chaotic 'macro-pulse' laser with 488nm wavelength and various repetition frequencies and pulse widths can be obtained, namely the repetition frequency and the pulse width of the laser can be adjusted in a certain range.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (9)
1. A chaotic pulse laser is characterized by comprising a pulse driving source (1), a temperature controller (2), a 1064nm laser diode (3), a beam shaping device (4) and an optical feedback cavity;
a pulse drive source (1) for outputting a square-wave pulse-modulated current;
the 1064nm laser diode (3) is used for generating 1064nm pulse laser under the excitation of square wave pulse modulation current, marking the pulse laser as first pulse laser, receiving the pulse laser returned by the optical feedback cavity, marking the pulse laser as second pulse laser, and enabling the second pulse laser to form interference on the first pulse laser, so that 1064nm chaotic pulse laser is generated;
the temperature controller (2) is used for controlling the temperature of the 1064nm laser diode (3) within a preset range;
the beam shaping device (4) shapes and collimates the first pulse laser output by the 1064nm laser diode (3) and outputs the first pulse laser; the second pulse laser fed back by the optical feedback cavity is received and output to a 1064nm laser diode (3);
the optical feedback cavity is used for reflecting the first pulse laser along the original path to obtain second pulse laser;
the optical feedback cavity comprises a rotatable half-wave plate (5), a polarization beam splitter prism (6) and a total reflection mirror (7);
the rotatable half-wave plate (5), the polarization beam splitting prism (6) and the total reflection mirror (7) are sequentially arranged on a light path of a light beam output by the light beam shaping device (4), pulse laser output from the light beam shaping device (4) passes through the rotatable half-wave plate (5) and enters the polarization beam splitting prism (6), the polarization beam splitting prism (6) transmits and reflects the light beam, reflected light enters the total reflection mirror (7), the pulse laser totally reflected by the total reflection mirror (7) is fed back, and the reflected light passes through the polarization beam splitting prism (6) and the rotatable half-wave plate (5) and returns to the light beam shaping device (4);
the rotatable half-wave plate (5) is used for controlling the intensity ratio of the transmitted light to the reflected light of the polarization beam splitter prism (6), and the intensity ratio of the transmitted light to the reflected light is controlled within a certain range through fine adjustment of the rotatable half-wave plate (5), so that the 1064nm laser diode (3) can generate output of 1064nm chaotic pulse laser.
2. A chaotic pulse laser according to claim 1, further comprising a chaotic pulse laser amplifier comprising an optical isolator (8), a Nd: YAG gain medium (9) with an LD array;
an optical isolator (8) and an Nd-YAG gain medium (9) with an LD array are sequentially arranged on a light path of a transmission output light beam of the polarization beam splitter prism (6), 1064nm chaotic pulse laser transmitted and output from the polarization beam splitter prism (6) passes through the optical isolator (8) and enters the Nd-YAG gain medium (9) to amplify the power of the chaotic pulse laser and output high-power 1064nm chaotic pulse laser;
and the optical isolator (8) is used for isolating the return of the laser beam entering the Nd: YAG gain medium (9), and the gain medium (9) is used for realizing the amplification of the chaotic pulse laser power.
3. The chaotic pulse laser according to claim 2, further comprising a frequency doubling crystal (10);
the frequency doubling crystal (10) is placed on a light path of a light beam output by the gain medium (9), and the 1064nm chaotic pulse laser is converted into 532nm chaotic pulse laser.
4. The chaotic pulse laser as claimed in claim 1, wherein the square wave pulse modulation current intensity is 1.2 to 2.5 times of the threshold current of the laser diode with reference to the threshold current of the laser diode, the frequency is not higher than 20MHz, and the duty ratio is 40% to 60%.
5. The chaotic pulse laser according to claim 1, wherein the extinction ratio of the polarization splitting prism (6) is greater than or equal to 1000: 1.
6. The chaotic pulse laser according to claim 1, wherein the laser output port of the 1064nm laser diode (3) is located at the focal point of the beam shaping device (4).
7. The chaotic pulse laser according to claim 1, wherein the distance between the polarization beam splitter prism (6) and the total reflection mirror (7) is set to be 10 to 50 mm.
8. The chaotic pulse laser as claimed in claim 1, wherein the pulse period of the square wave pulse modulated current is less than or equal to the delay time of the pulse laser beam output from the 1064nm laser diode (3) to reach the 1064nm laser diode (3) again after being fed back through the beam shaping device (4) and the optical feedback cavity.
9. The chaotic pulse laser as set forth in claim 1, wherein the rotating half-wave plate is adjusted by:
s1, placing the photoelectric detector at the front side of the polarization beam splitter prism, namely the laser output direction, wherein the output end of the photoelectric detector is connected with an oscilloscope, and the oscilloscope is used for observing the time domain waveform of the output laser;
s2, rotating the half-wave plate to enable the feedback intensity to be 0, and observing the first pulse laser through an oscilloscope;
s3, finely adjusting the half-wave plate towards a certain direction to gradually increase the feedback intensity, when the feedback intensity is slowly increased to a certain intensity, seeing that the top end of the originally smooth square wave pulse generates noise-like jitter from an oscilloscope, and entering the step S4;
s4, finely adjusting the half-wave plate in the small range of the feedback intensity, and finding out the position with the maximum jitter amplitude, wherein the output is the 'macro-pulse' chaotic laser with the maximum power.
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| CN106848824B (en) * | 2017-03-31 | 2019-03-29 | 中国科学院国家授时中心 | A kind of integrated laser system and method |
| CN109494557B (en) * | 2018-12-04 | 2021-01-12 | 西南大学 | All-solid-state pulse amplitude chaotic laser source of laser diode pump |
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