CN113702005A - Synchronous signal measuring device of Q-switched laser - Google Patents
Synchronous signal measuring device of Q-switched laser Download PDFInfo
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- CN113702005A CN113702005A CN202111015645.9A CN202111015645A CN113702005A CN 113702005 A CN113702005 A CN 113702005A CN 202111015645 A CN202111015645 A CN 202111015645A CN 113702005 A CN113702005 A CN 113702005A
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- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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Abstract
The invention discloses a synchronous signal measuring device of a Q-switched laser, which is based on the Q-switched laser and also comprises a laser beam expanding mechanism, a reflector, a beam splitting optical mechanism, a photosensitive diode and an emitting component; the invention expands the pulse laser emitted by the light and small Q-switched laser when working through the lens beam expanding mechanism to obtain the emission beam meeting the divergence angle index, the emission beam is emitted to the center of the reflector from the center of the beam expanding mechanism to be bent, and then is split through the beam splitting optical mechanism, so that a very small part of laser energy can transmit through the beam splitting optical mechanism and strike on the detection end face of the photosensitive diode, and the electric signal output from the detection end face of the photosensitive diode is output after being shaped and amplified to obtain the light-emitting synchronous signal of the Q-switched laser. The method is simple and reliable, has high stability in long-term operation, and has good application prospect in the fields of long-distance laser ranging, atmospheric detection laser radar and the like.
Description
Technical Field
The invention relates to the technical field of photoelectric detection and laser engineering application, in particular to a synchronous signal measuring device of a Q-switched laser.
Background
The Q-switched laser generally uses an acousto-optic modulator as an optical switch to control the loss in a laser resonant cavity, weaken the loss in the cavity at one moment to achieve ultrahigh gain, and output an ultrastrong laser pulse signal. The laser oscillator is characterized by high pulse energy of output laser, high peak power, short pulse duration, normally nanosecond level, manually controllable repetition frequency, convenient modulation of resonant cavity and the like. The advantages are obvious, so the method is widely applied to the fields of long-distance (more than 10km) laser ranging, atmospheric detection laser radar, medical cosmetology and the like.
The accurate recording of the light-emitting time, and the following and detection of the change of the Q-switched laser light-emitting quality are the basis for obtaining accurate and effective inversion data results of instruments such as a laser ranging and atmospheric sounding laser radar. The laser synchronous signal measuring device can convert an optical pulse signal generated by the laser into an electric pulse signal, and follow and record the light-emitting time and the dynamic intensity change process of the laser. The conventional Q-switched laser signal synchronization signal measurement or generation device mostly adopts a synchronization signal output port of a laser, or uses an instrument device such as a transient recorder to record the light emitting time of the laser. It mainly has the following two disadvantages:
(1) the anti-environment change capability is poor, a phase difference generally exists between a synchronization signal output by a Q-switched laser and a laser emergent light signal, the phase difference is represented in time as that the phase difference has a time difference of about 1 microsecond, and the time difference can slightly drift along with the change of conditions such as external temperature, humidity and the like, so that certain errors are brought to the inversion work of laser ranging and atmospheric detection laser radar data, and the use efficiency of an instrument and the development of research work are influenced;
(2) the method has the advantages that instrument equipment such as a transient recorder is used for measuring and recording the light emitting change of the Q-switched laser, the method is relatively high in cost, and the method is difficult to popularize and use.
Disclosure of Invention
The synchronous signal measuring device of the Q-switched laser can solve the technical problems that a phase difference exists between a synchronous signal output by a conventional Q-switched laser and actual light emitted by the laser and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a synchronous signal measuring device of a Q-switched laser is based on the Q-switched laser and further comprises a laser beam expanding mechanism, a reflector, a light splitting optical mechanism, a photosensitive diode and an emitting assembly;
the optical axis of the transmitting light path of the Q-switched laser is at the same height with the central positions of the laser beam expanding mechanism and the reflector; the outgoing laser optical axis of the Q-switched laser is coaxial with the center of the beam expanding mechanism, and the laser optical axis is reflected to the center of the beam splitting optical mechanism through the center of the reflector;
the photosensitive diode is positioned right behind the light splitting optical mechanism, and the specific position can ensure that the laser penetrating through the light splitting optical mechanism can be shot to the photosensitive detection end face of the photosensitive diode;
the photosensitive diode is connected with the photoelectric shaping circuit through a cable;
the laser light reflected by the color separation optical mechanism finally reaches the emitting component.
Furthermore, the full-curing Q-switched laser, the laser beam expanding mechanism, the reflector, the beam splitting optical mechanism, the photosensitive diode and the emitting assembly are all fixed on the substrate through mechanical parts.
Furthermore, the smooth surface of the reflector is plated with a high-reflectivity dielectric film corresponding to the emergent wavelength of the Q-switched laser.
Furthermore, the surface of the color separation optical mechanism is plated with a dielectric film corresponding to the emitting wavelength of the Q-switched laser.
Further, the dielectric film of the color separation optical mechanism has a reflectance of 95% and a transmittance of 5% at the corresponding wavelength.
Furthermore, the photosensitive diode can respond to laser wavelength signals emitted by the Q-switched laser, the response delay time is less than 0.1ns, the photosensitive diode dynamically changes along with the laser light emitting signals, and the change frequency of the photosensitive diode is consistent with that of the Q-switched laser.
According to the technical scheme, the synchronous signal measuring device of the Q-switched laser expands the laser beam emitted by the Q-switched laser during working through the lens group to obtain the emission beam meeting the divergence angle index, the laser beam after expanding is split through the color separation sheet, most energy (more than 95%) of the laser is reflected by the color separation sheet and then emitted for application requirements such as distance measurement, radar detection and the like during beam splitting, and a small part of energy (less than 5%) of the laser directly enters the detection end face of the high-sensitivity photosensitive diode through the color separation sheet, and the high-sensitivity photosensitive diode converts the optical signal into an electric signal after detecting the pulse laser signal, and after the signal is amplified, filtered and shaped by a signal conditioning circuit, a standard TTL or CMOS square wave pulse signal is generated and is directly used for ranging or synchronous triggering of an atmosphere detection laser radar system.
The method adopts the high-sensitivity photosensitive detection diode to directly detect the pulse laser signal output by the Q-switched laser, realizes electric signal isolation with the laser control module, shields the electric interference caused by the laser, and has the characteristics of high stability, following speed block, small volume, simple structure and high cost performance.
Drawings
FIG. 1 is a schematic diagram of the basic structure of the apparatus of the present invention;
fig. 2 is a schematic diagram of the principles of the optoelectronic shaping circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, the device for measuring a synchronization signal of a Q-switched laser according to this embodiment, for a high repetition frequency nanosecond Q-switched laser, includes a small light full-curing Q-switched laser 1, a laser beam expanding mechanism 2, a reflector 3, a color separation optical mechanism 4, a photodiode 5, a photoelectric conversion module 6, and an emitting component 7.
The light and small full-curing Q-switched laser 1, the laser beam expanding mechanism 2, the reflector 3, the beam splitting optical mechanism 4, the photosensitive diode 5 and the emitting component 7 are connected with the substrate 9 through mechanical parts, and the photoelectric shaping circuit 6 is connected with the photosensitive diode 5 through a shielding signal line. The light and small full-curing Q-switched laser is connected with a substrate through a fastening screw and is arranged at the upper left corner of the substrate; the laser beam expanding mechanism 2 is positioned on the right side of the light small-sized full-curing laser 1, the horizontal distance between the light small-sized full-curing laser 1 and the light small-sized full-curing laser 1 is about 5-20cm adjustable, the optical axis of laser emitted by the laser 1 is coaxial with the center of the beam expanding mechanism 2, and the laser beam expanding mechanism 2 is connected with the substrate 9 through the lens bracket supporting mechanism and the screw hole position; the reflector 3 is connected with the substrate 9 through an optical support frame and is arranged on the right side of the laser beam expanding mechanism 2, the horizontal distance between the reflector 3 and the substrate is about 10cm, and the laser optical axis is reflected to the center of the beam splitting optical mechanism 4 through the center of the reflector 3; the light splitting optical mechanism 4 is connected with the substrate 9 through a fastening screw; the photosensitive diode 5 is positioned right behind the wind-solar optical mechanism, and the specific position can ensure that the laser penetrating through the light splitting optical mechanism 4 can be shot to the photosensitive detection end face of the photosensitive diode 5; the photoelectric shaping circuit 6 is connected with the photosensitive diode 5 through a cable, and the laser emitting component 7 is connected with the substrate 9 through a fastening screw.
Specifically, according to the device for measuring the synchronous signal of the Q-switched laser, disclosed by the embodiment of the invention, the pulse energy of the Q-switched laser 1 is in the micro-joule or millijoule magnitude, and the repetition frequency is not more than 10 KHz; the optical axis of the transmitting light path of the Q-switched laser 1 is at the same height with the central positions of the laser beam expanding mechanism 2 and the reflector 3; the smooth surface of the reflector 3 is plated with a high-reflectivity dielectric film corresponding to the emergent wavelength of the laser; the surface of the color separation optical mechanism 4 is plated with a dielectric film corresponding to the emergent wavelength of the Q-switched laser 1, and the reflectivity of the dielectric film under the corresponding wavelength is about 95 percent, and the transmittance is about 5 percent; the photosensitive diode 5 can respond to laser wavelength signals emitted by the Q-switched laser 1, the response delay time is less than 0.1ns, the photosensitive diode 5 can dynamically change along with the laser light emitting signals, and the change frequency of the photosensitive diode is consistent with that of the Q-switched laser 1; the photoelectric shaping circuit 6 comprises a driving circuit of the photosensitive diode 5, and functional circuits of following, amplifying, shaping and outputting of output signals of the photosensitive diode 5, and the following and recording functions of the Q-switched laser 1 are finally realized. The laser reflected by the color separation optical mechanism 4 finally reaches the distance meter or the radar transmitting component 7 to fulfill the aim of detecting the requirement of the corresponding function. The photoelectric shaping circuit is shown in detail in fig. 2.
In summary, the invention expands the pulse laser emitted by the light and small Q-switched laser during operation by the lens beam expanding mechanism to obtain an emission beam meeting the divergence angle index, and the emission beam is emitted from the center of the beam expanding mechanism to the center of the reflector for turning, and then is split by the beam splitting optical mechanism, so that a very small part of the laser energy can transmit through the beam splitting optical mechanism and strike on the detection end face of the photodiode, and the electrical signal output from the detection end face of the photodiode is shaped and amplified and then output to obtain the light-emitting synchronous signal of the Q-switched laser. The method is simple and reliable, has high stability in long-term operation, and has good application prospect in the fields of long-distance laser ranging, atmospheric detection laser radar and the like.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A synchronous signal measuring device of Q-switched laser is based on Q-switched laser (1), its characterized in that:
the device also comprises a laser beam expanding mechanism (2), a reflector (3), a light splitting optical mechanism (4), a photosensitive diode (5) and an emitting component (7);
the optical axis of the transmitting light path of the Q-switched laser (1) is at the same height with the central positions of the laser beam expanding mechanism (2) and the reflector (3); the outgoing laser optical axis of the Q-switched laser (1) is coaxial with the center of the beam expanding mechanism (2), and the laser optical axis is reflected to the center of the beam splitting optical mechanism (4) through the center of the reflector (3);
the photosensitive diode (5) is positioned right behind the light splitting optical mechanism (4), and the specific position can ensure that the laser penetrating through the light splitting optical mechanism (4) can be shot to the photosensitive detection end face of the photosensitive diode (5);
the photosensitive diode (5) is connected with the photoelectric shaping circuit (6) through a cable;
the laser light reflected by the color separation optical mechanism (4) finally reaches the emitting component (7).
2. The apparatus of claim 1, wherein: the full-curing Q-switched laser (1), the laser beam expanding mechanism (2), the reflector (3), the light splitting optical mechanism (4), the photosensitive diode (5) and the emitting component (7) are fixed on the substrate (9) through mechanical parts.
3. The apparatus of claim 1, wherein:
the light surface of the reflector (3) is plated with a high-reflectivity dielectric film corresponding to the emergent wavelength of the Q-switched laser (1).
4. The apparatus of claim 1, wherein:
the surface of the color separation optical mechanism (4) is plated with a dielectric film corresponding to the emitting wavelength of the Q-switched laser (1).
5. The apparatus for measuring the synchronization signal of a Q-switched laser according to claim 4, wherein:
the dielectric film of the color separation optical mechanism (4) has a reflectance of 95% and a transmittance of 5% at the corresponding wavelengths.
6. The apparatus of claim 1, wherein:
the photosensitive diode (5) can respond to a laser wavelength signal emitted by the Q-switched laser (1), the response delay time is less than 0.1ns, the photosensitive diode (5) dynamically changes along with the laser emitting signal, and the change frequency of the photosensitive diode is consistent with that of the Q-switched laser (1).
7. The apparatus of claim 1, wherein:
the horizontal distance between the laser beam expanding mechanism (2) and the full-curing laser (1) is 5-20cm adjustable.
8. The apparatus of claim 1, wherein: the laser beam expanding mechanism (2) is fixedly connected with the base plate (9) through the lens bracket supporting mechanism and the screw hole positions.
9. The apparatus of claim 1, wherein:
the reflector (3) is connected with the substrate (9) through an optical support frame.
10. The apparatus of claim 1, wherein:
the horizontal distance between the reflector (3) and the laser beam expanding mechanism (2) is 10 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111015645.9A CN113702005A (en) | 2021-08-31 | 2021-08-31 | Synchronous signal measuring device of Q-switched laser |
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| CN202111015645.9A CN113702005A (en) | 2021-08-31 | 2021-08-31 | Synchronous signal measuring device of Q-switched laser |
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