CN113410746B - Raman laser modulation device and method - Google Patents
Raman laser modulation device and method Download PDFInfo
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- CN113410746B CN113410746B CN202110666410.XA CN202110666410A CN113410746B CN 113410746 B CN113410746 B CN 113410746B CN 202110666410 A CN202110666410 A CN 202110666410A CN 113410746 B CN113410746 B CN 113410746B
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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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
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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
- H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
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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
- H01S5/0085—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 modulating the output, i.e. the laser beam is modulated outside the laser cavity
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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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Abstract
The raman laser modulation device and method provided by the embodiment of the application firstly emit laser to a laser transmission channel, and then adjust the position relationship between the laser transmission channel and an optical microcavity, so that the laser is coupled with the optical microcavity through the laser transmission channel in a resonant mode. The laser is then further tuned to cause mechanical frequency combing of the image displayed by the radiofrequency spectrometer to produce raman laser light. According to the Raman laser modulation method and device, the Raman laser is effectively switched by introducing the mechanical frequency comb characteristic, and the function of an optical switch is realized. The preparation process is simplified, and a new idea is provided for Raman laser generation and optical switch application.
Description
Technical Field
The application relates to the field of precision instruments, in particular to a Raman laser modulation device and method.
Background
The whispering gallery mode optical microcavity has extremely high quality factors and smaller mode volume, can greatly enhance the interaction between a light field and a substance, and attracts more and more research interests in the field of generating Raman laser. In the conventional techniques, the technique of generating raman laser using an optical microcavity can be classified into two types according to the gain mechanism. One is to use materials like semiconductors and doped with rare earth elements to achieve gain amplification. Another class is to use nonlinear effects to achieve gain amplification of the laser.
In the traditional technology, the preparation process required by the optical microcavity for generating the Raman laser is very complex, and the switching function of the Raman laser can not be effectively realized.
Disclosure of Invention
Based on this, the invention provides a raman laser modulation device and method in order to solve the problems that in the prior art, the preparation process for generating raman laser by an optical microcavity is very complex and a raman laser switch cannot be switched.
A raman laser modulation device, comprising: a laser emitting device for emitting laser; the laser transmission channel is used for the laser to enter; an optical microcavity disposed adjacent to the laser transmission channel; the laser enters the photoelectric detector through the laser transmission channel; and the radio frequency spectrometer is electrically connected with the photoelectric detector and is used for observing the mechanical frequency comb phenomenon.
In one embodiment, the laser emitting apparatus includes: a laser pumping source pumping the laser; a laser isolator into which the laser light enters; and the laser light passing through the laser isolator enters the laser amplifier.
In one embodiment, the optical microcavity includes a microcavity inner diameter. The diameter of the microcavity inner diameter is 50 microns.
In one embodiment, the raman laser modulation apparatus further includes: the oscilloscope is electrically connected with the photoelectric detector and is used for observing a time domain signal and finding out the optimal resonance coupling point of the laser and the optical microcavity; and the laser output by the optical microcavity enters the spectrometer through the laser transmission channel and is used for observing whether the Raman laser is generated or not.
A Raman laser modulation method is applied to the Raman laser modulation device and is characterized by comprising the following steps:
s110, transmitting laser to the laser transmission channel;
s120, adjusting the positions of the laser transmission channel and the optical microcavity to enable the laser to be in resonance coupling with the optical microcavity;
s130, adjusting the laser to enable the image displayed by the radio frequency spectrometer to have a mechanical frequency comb phenomenon so as to generate Raman laser.
In one embodiment, the 130 includes:
s131, adjusting the input wavelength of the laser;
s132, observing an image displayed by the radio frequency spectrum instrument;
s133, when the image displayed by the radio frequency spectrometer has a mechanical frequency comb phenomenon, stopping adjusting the input wavelength of the laser;
and S134, observing Raman laser generation by using the spectrometer.
In one embodiment, the S131 includes: the input wavelength of the laser is adjusted to increase stepwise in fixed steps.
In one embodiment, the fixed step size is 0.003 nm.
In one embodiment, the raman laser modulation method further includes:
s140, adjusting the laser to enable the mechanical frequency comb phenomenon on the image displayed by the radio frequency spectrum instrument to disappear, and closing the Raman laser.
In one embodiment, the S140 includes:
s141, adjusting the input wavelength of the laser;
s142, observing the image displayed by the radio frequency spectrum instrument;
s143, when the mechanical frequency combing phenomenon of the image displayed by the radio frequency spectrometer disappears, stopping adjusting the input wavelength of the laser;
and S144, observing the disappearance of the Raman laser by using the spectrometer.
The Raman laser modulation device and method provided by the application firstly emit laser to a laser transmission channel, and then adjust the position relation between the laser transmission channel and an optical microcavity, so that the laser is coupled with the optical microcavity through the laser transmission channel in a resonant mode. The laser is then further tuned to cause mechanical frequency combing of the image displayed by the radiofrequency spectrometer to produce raman laser light. According to the Raman laser modulation method and device, the Raman laser is effectively switched by introducing the mechanical frequency comb characteristic, and the function of an optical switch is realized. The Raman laser modulation method and the Raman laser modulation device simplify the Raman laser modulation process, and provide a new idea for Raman laser generation and optical switch application.
Drawings
Fig. 1 is a schematic diagram of a raman laser modulation device according to an embodiment of the present disclosure.
Fig. 2 is a flowchart of a raman laser modulation method in an embodiment provided in the present application.
Fig. 3 is a schematic diagram illustrating a mechanical frequency comb phenomenon in an embodiment provided in the present application.
Fig. 4 is a schematic diagram of raman laser light appearing in an embodiment provided in the present application.
Fig. 5 is a schematic diagram illustrating a mechanical frequency combing phenomenon in another embodiment provided in the present application.
Fig. 6 is a schematic diagram illustrating that no mechanical frequency combing phenomenon occurs in an embodiment provided in the present application.
Fig. 7 is a schematic diagram of an embodiment of the present disclosure without raman laser.
Description of the reference numerals
The device comprises a Raman laser modulation device 10, a laser emitting device 100, a laser pumping source 110, a laser isolator 120, a laser amplifier 130, an optical microcavity 210, a laser transmission channel 220, a microcavity inner diameter 230, a spectrometer 310, an oscilloscope 320, a photoelectric detector 330 and a radio frequency spectrometer 340.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
The numbering of the components as such, e.g., "first", "second", etc., is used herein for the purpose of describing the objects only, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be considered as limiting the present application.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, the present embodiment provides a raman laser modulation device 10. The raman laser modulation device 10 includes a laser emitting device 100, a laser transmission channel 220, an optical microcavity 210, a photodetector 330, and a radio frequency spectrometer 340. The laser emitting apparatus 100 is used to emit laser light. The laser light enters the laser transmission channel 220. The optical microcavity 210 is disposed adjacent to the laser transmission channel 220. The laser light passing through the optical microcavity 210 enters the photodetector 330 through the laser transmission channel 220. The radio frequency spectrometer 340 is electrically connected to the photodetector 330. The radio frequency spectrometer 340 is used to observe a mechanical frequency comb phenomenon.
The laser transmission channel 220 may be a thinned optical fiber. The optical fiber may be obtained by stripping the outer sheath of the optical cable. The length and diameter of the optical fiber can be selected as desired. The optical fiber may alternatively be a multimode optical fiber. The diameter of the multimode optical fiber is 15-50 μm. The optical fiber may alternatively be a single mode optical fiber. The diameter of the single-mode optical fiber core is 8-10 mu m. The fiber may be first heated with an oxyhydrogen flame at a suitable temperature. Then, a special platform is used for drawing the thinned optical fiber with the diameter of about hundreds of nanometers to 1 micron at a constant speed. The laser may be emitted into the laser transmission channel 220 by the laser emitting device 100.
The optical microcavity 210 can be fabricated from a high purity silicon wafer. The surface of the optical microcavity 210 can be plated with a 2 micron thick layer of silicon dioxide. The optical microcavity 210 can be fabricated by first cleaning and dicing a silicon wafer. And coating photoresist on the surface of the silicon wafer and drying. And placing a mask plate with a circular pattern on the surface of the silicon wafer. And exposing the silicon wafer by ultraviolet rays. And developing the silicon wafer in a developing solution, wherein the photoresist exposed by ultraviolet rays can be cleaned by the developing solution, the photoresist protected by the circular pattern still remains on the surface of the silicon wafer, and the pattern in the mask is converted into the pattern of the photoresist. And cleaning the silicon wafer by using high-purity water after the development is finished. And etching the developed silicon wafer in hydrofluoric acid. The silicon dioxide reacts with the hydrofluoric acid and the silicon dioxide covered by the photoresist does not react, so that the unetched silicon dioxide forms the desired pattern. And after the etching is finished, cleaning the silicon wafer by using acetone, alcohol and high-purity water. And cutting the silicon wafer into strips, and putting the strips into a xenon fluoride etching machine for etching. Xenon fluoride reacts very fast with silicon and slowly with silicon dioxide, so that circular pillars can be etched in the silicon below the silicon dioxide layer. Then, the silicon dioxide is subjected to laser thermal reflow. The center wavelength of the silica laser is 10.6 microns. Silica has a strong absorption in this band. During thermal reflow, the silica melts rapidly and then shrinks due to surface tension to form a minicore ring cavity.
In this embodiment, the raman laser modulation device 10 simplifies the modulation process of the raman laser by introducing a mechanical frequency comb characteristic. The operation is simple and convenient, and the cost is saved. The raman laser modulation device 10 also realizes effective switching of raman laser, and provides a new idea for raman laser generation and optical switching.
In one embodiment, the laser emitting device 110 includes a laser pump source 110, a laser isolator 120, and a laser amplifier 130. The laser pump source 110, the laser isolator 120 and the laser amplifier 130 are connected in sequence. The laser pump source 110 pumps the laser. The laser light enters the laser isolator 120. The laser light passing through the laser isolator 120 enters the laser amplifier 130. The laser isolator 120 can prevent the laser pumping source 110 from pumping the laser with too much power, and the laser is reversely input to the laser pumping source 110 to damage the laser pumping source 110. The laser amplifier 130 amplifies the laser pumping power. The laser light is output from the laser amplifier 130 into the laser transmission channel 220. Adjusting the laser pump source 110 can adjust the input wavelength of the laser, thereby controlling the closing of the raman laser.
In one embodiment, the optical microcavity 210 includes a microcavity inner diameter 230. The microcavity inner diameter 230 is 50 microns in diameter. It is understood that the microcavity inner diameters 230 of the optical microcavities 210 are typically 40 microns to 80 microns in diameter. The optical microcavity 210 can be a disk structure. The thickness of the edge of the optical microcavity 210 can be greater than the thickness of the middle portion of the optical microcavity 210, so that the raman laser can be more easily excited.
In one embodiment, the raman laser modulation device 10 further comprises an oscilloscope 320 and a spectrometer 310. The oscilloscope 320 is electrically connected to the photodetector 330. The oscilloscope 320 is used for observing a time domain signal and finding an optimal resonance coupling point of the laser and the optical microcavity 210. The laser light output by the optical microcavity 210 enters the spectrometer 310 through the laser transmission channel 220. The spectrometer 310 is used to observe whether or not a raman laser is generated.
Referring to fig. 2, an embodiment of the present application provides a raman laser modulation method. The method comprises the following steps:
s110, transmitting laser to the laser transmission channel 220;
s120, adjusting the positions of the laser transmission channel 220 and the optical microcavity 210, so that the laser and the optical microcavity 210 are coupled in resonance; and
s130, adjusting the laser to enable the image displayed by the radio frequency spectrum instrument 340 to have a mechanical frequency comb phenomenon so as to generate Raman laser.
In S110, the laser transmission channel 220 may be a thinned optical fiber. The laser may be emitted into the laser transmission channel 220 by the laser emitting device 100. The laser is pumped into the laser isolator 120 by the laser pump source 110, and then enters the laser amplifier 130. The laser light is output from the laser amplifier 130 into the laser transmission channel 220. The input wavelength of the laser may be 1545nm to 1555 nm.
In S120, the laser transmission channel 220 and the optical microcavity 210 may be located on the same plane. The positional relationship of the laser delivery channel 220 and the optical microcavity can be controlled using precision displacement equipment that precisely controls displacement. When the laser is tuned to the resonant frequency of the optical microcavity 210, the laser can be coupled into the optical microcavity 210 through the laser transmission channel 220 and the optical microcavity 210.
In S130, the laser may be adjusted by adjusting the laser pump source 110 in the laser emitting device 100. When the mechanical frequency comb phenomenon is visible on the image displayed by the radio frequency spectrometer 340, the raman laser modulation device 10 can generate raman laser light. The mechanical frequency comb phenomenon is a phenomenon in which different peaks of comb shapes having frequencies ranging from several megahertz to several tens of megahertz (microcavity mechanical vibration frequencies) appear on an image displayed by the radio frequency spectrometer 340. The peaks represent vibrations at different frequencies, which is manifested in the mechanical frequency as a mechanical frequency comb.
The raman laser modulation method described above first emits laser light to the laser transmission channel 220. The positional relationship of the laser transmission channel 220 and the optical microcavity 210 is then adjusted so that the laser light is resonantly coupled to the optical microcavity 210 through the laser transmission channel 220. The laser light is then further adjusted to cause mechanical frequency combing of the image displayed by the radio frequency spectrometer 340 to produce raman laser light. The Raman laser modulation method effectively switches Raman laser by introducing mechanical frequency comb characteristics, and realizes the function of an optical switch. The Raman laser modulation method simplifies the Raman laser modulation process and provides a new idea for Raman laser generation and optical switch application.
In one embodiment, the S120 may include:
s121, the laser transmission channel 220 slowly approaches the edge of the optical microcavity 210 from a position far away from the optical microcavity 210;
s122, when the laser light is resonantly coupled to the optical microcavity 210 through the laser transmission channel 220, stopping adjusting the position of the laser transmission channel 220.
In S121, the laser transmission channel 220 and the optical microcavity 210 may be located on the same plane. The laser transmission channel 220 may be placed away from the optical microcavity 210. The laser delivery passage 220 may be controlled to move slowly upward using a precision displacement device that precisely controls the displacement. The laser transmission channel 220 may be gradually close to the edge of the optical microcavity 210.
In S122, when the laser transmission channel 220 gradually approaches the edge of the optical microcavity 210 to a certain position, the laser in the laser transmission channel 220 may resonate with the frequency of the optical microcavity 210. The laser transmission channel 220 can be adjusted from a position away from the optical microcavity 210 while looking into the oscilloscope 320, slowly approaching the edge of the optical microcavity 210. When the oscilloscope 320 has the optimal resonant coupling point of the laser and the optical microcavity 210, the adjustment of the position of the laser transmission channel 220 is stopped. At this time, the laser light may be coupled into the optical microcavity 210 through the laser transmission channel 220 and the optical microcavity 210.
In one embodiment, the S130 includes:
s131, adjusting the input wavelength of the laser;
s132, observing the image displayed by the radio frequency spectrometer 340;
s133, when the image displayed by the radio frequency spectrometer 340 has a mechanical frequency comb phenomenon, stopping adjusting the input wavelength of the laser; and
s134, the spectrometer 310 is used to observe raman laser generation.
In S131, the laser emitting device 100 may be adjusted to adjust the input wavelength of the laser. Further, the input wavelength of the laser may be adjusted by adjusting the laser pump source 110. The input wavelength of the laser may be adjusted to increase from 1545 nm. The detuning value can be adjusted by adjusting the input wavelength of the laser. The detuning value is the difference between the laser frequency and the frequency at which the optical microcavity 210 vibrates. Adjusting the detuning value may cause the mechanical frequency combing phenomenon to occur.
In S132, the laser input wavelength is adjusted to increase from 1545nm while observing the radio frequency spectrometer 340. The laser light passing through the optical microcavity 210 enters the photodetector 330 through the laser transmission channel 220. The photodetector 330 converts the optical signal into an electrical signal. The radio frequency spectrometer 340 is electrically connected to the photodetector 330. The radio frequency spectrometer 340 receives the electrical signal and presents an image of the frequency of the horizontal axis versus the power of the vertical axis. Adjusting the laser emitting device 100 changes the input wavelength of the laser. Then, the input wavelength of the laser is adjusted to the radio frequency spectrometer 340, so that a mechanical frequency comb phenomenon occurs, and the raman laser modulation device 10 generates the raman laser.
In S132, referring to fig. 3, when the input wavelength of the laser is increased to a certain value, the image displayed by the radio frequency spectrometer 340 may be observed to have the mechanical frequency comb phenomenon shown in fig. 3. Different peaks of comb shape can be observed on the image displayed by the radio frequency spectrometer 340. At this point, the adjustment of the input wavelength of the laser is stopped.
In the spectrum instrument 134, the spectrometer 310 is observed when the image displayed by the radio frequency spectrometer 340 is observed to have the mechanical frequency comb phenomenon shown in fig. 3. At this time, the image on the spectrometer 310 generates raman laser light as shown in fig. 4.
In one embodiment, referring to FIG. 3, by varying the input wavelength of the laser from 1545.38nm to 1545.40nm, it is possible to adjust the image displayed by the radio frequency spectrometer 340 to exhibit a mechanical frequency comb phenomenon. The raman laser appears on the image displayed by the spectrometer 310. The main frequency of the mechanical frequency comb is about 35MHz, and conforms to the vibration frequency (several MHz to several tens MHz) of the optical microcavity 210.
In one embodiment, referring to fig. 5, the mechanical frequency comb sideband peaks increase more and more as the input wavelength of the laser is increased stepwise to 1545.45 nm. At this time, the raman laser light displayed on the spectrometer 310 is increasingly stronger to the maximum value.
In one embodiment, the 131 comprises:
the input wavelength of the laser is adjusted to increase stepwise in fixed steps.
After the laser is emitted into the laser transmission channel 220, the position of the laser transmission channel 220 is adjusted, so that the laser is coupled with the optical microcavity 210 through the laser transmission channel 220 in a resonant manner. The input wavelength of the laser light can then be adjusted by adjusting the laser emitting device 100. The input wavelength of the laser may be adjusted from 1545 nm. Further, the step length of each increase or decrease of the input wavelength of the laser is the same. Each time the input wavelength of the laser is adjusted, it is possible to observe whether the radio frequency spectrometer 340 has a mechanical frequency comb phenomenon. And adjusting the input wavelength of the laser for multiple times until the phenomenon of mechanical frequency combing is observed in the radio frequency spectrometer 340, and the Raman laser appears in the spectrometer 310. Therefore, the method provided by the embodiment is simple to operate.
In one embodiment, the fixed step size is 0.003 nm. The input wavelength adjustment of the laser tends to be stable, and the phenomenon that the laser jumps so as to cross the corresponding mechanical frequency comb phenomenon when the Raman laser is generated cannot occur. Further, the fixed step length is selected to be 0.003nm, the requirement on the precision of the equipment for emitting the laser is not high, and therefore the cost can be reduced.
In one embodiment, the raman laser modulation method further includes:
s140, adjusting the laser to enable the mechanical frequency comb phenomenon on the image displayed by the radio frequency spectrometer 340 to disappear, and turning off the Raman laser.
In S140, the laser is adjusted by adjusting the laser emitting device (100). The raman laser is turned off when the mechanical combing phenomenon disappears as seen in the image displayed on the radio frequency spectrometer (340). Switching of opening and closing of the Raman laser is achieved by adjusting the laser. The function of an optical switch is realized while the Raman laser is prepared.
In one embodiment, the S140 includes:
s141, adjusting the input wavelength of the laser;
s142, observing the image displayed by the radio frequency spectrometer 340;
s143, when the mechanical frequency combing phenomenon of the image displayed by the radio frequency spectrometer 340 disappears, stopping adjusting the input wavelength of the laser; and
s144, the spectrometer 310 is used to observe the disappearance of the raman laser.
In S141, the laser emitting device 100 may be adjusted to adjust the input wavelength of the laser. The input wavelength of the laser may be increased or decreased stepwise starting from 1545.45 nm.
In S142, the laser input wavelength is adjusted to increase or decrease from 1545.45nm while observing the radio frequency spectrometer 340. The image presented by the radio frequency spectrometer 340 is an image of the frequency of the horizontal axis and the power of the vertical axis.
In S143, referring to fig. 6, when the input wavelength of the laser is adjusted to a certain value, the image displayed by the radio frequency spectrometer 340 may be observed to disappear as a series of peaks in a comb shape as shown in fig. 6. At this time, the mechanical frequency comb phenomenon disappears, and the adjustment of the input wavelength of the laser is stopped.
In S144, when the image displayed by the radio frequency spectrometer 340 is observed to show the disappearance of the mechanical comb phenomenon shown in fig. 6, the spectrometer 310 is observed. At this point the image on the spectrometer 310 is as shown in figure 7 i.e. the raman laser disappears. The turning off of the raman laser is achieved.
The raman laser modulation method described above adjusts the laser pump source 110 to increase the input wavelength of the laser from 1545nm with a fixed step size of 0.003 nm. The laser input wavelength is adjusted while observing the radio frequency spectrometer 340. When the adjustment is carried out until the image displayed by the radio frequency spectrometer 340 has the mechanical frequency combing phenomenon, the adjustment of the laser pumping source 110 is stopped. At this time, the spectrometer 310 was observed to generate the raman laser. As the input wavelength of the laser is increased gradually to 1545.45nm, the mechanical frequency comb side band peaks are more and more, and the raman laser displayed on the spectrometer 310 is stronger and reaches the maximum value. The raman laser modulation device 10 realizes excitation generation of the raman laser.
The laser pump source 110 is adjusted to increase or decrease the input wavelength of the laser from 1545.45nm in fixed steps of 0.003 nm. The laser input wavelength is adjusted while observing the radio frequency spectrometer 340. When the mechanical frequency combing phenomenon of the image displayed by the radio frequency spectrometer 340 disappears, the laser pumping source 110 is stopped to be adjusted. At this time, the raman laser of the spectrometer 310 is observed to disappear. The raman laser modulation device 10 achieves the turning off of the raman laser.
The laser pump source 110 may be continuously adjusted to increase or decrease the input wavelength of the laser by a fixed step size of 0.003nm until the image displayed by the radio frequency spectrometer 340 shows a mechanical frequency combing phenomenon again. The spectrometer 310 is now observed to re-emit the raman laser.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-described examples merely represent several embodiments of the present application and are not to be construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A raman laser modulation device, comprising:
a laser emitting device (100) for emitting laser light;
a laser transmission channel (220), the laser light entering the laser transmission channel (220);
an optical microcavity (210) disposed adjacent to the laser transmission channel (220);
a photodetector (330), the laser light passing through the optical microcavity (210) entering the photodetector (330) through the laser transmission channel (220);
the oscilloscope (320) is electrically connected with the photoelectric detector (330) and is used for observing a time domain signal and finding out an optimal resonant coupling point of the laser and the optical microcavity (210);
a spectrometer (310), wherein the laser output by the optical microcavity (210) enters the spectrometer (310) through the laser transmission channel (220) for observing whether Raman laser is generated; and
a radio frequency spectrometer (340) electrically connected to the photodetector (330) for observing a mechanical frequency combing phenomenon that presents different peaks of a comb shape with a frequency of several to several tens of megahertz on an image displayed by the radio frequency spectrometer (340);
the raman laser modulation device generates the raman laser light when the mechanical frequency comb phenomenon is seen on the image displayed by the radio frequency spectrometer (340).
2. The raman laser modulation device according to claim 1, characterized in that said laser emitting device (110) comprises:
a laser pump source (110) that pumps the laser;
a laser isolator (120), the laser light entering the laser isolator (120);
a laser amplifier (130), the laser light passing through the laser isolator (120) entering the laser amplifier (130).
3. A raman laser modulation device according to claim 2, characterized in that said optical microcavity (210) includes an inner microcavity diameter (230), said inner microcavity diameter (230) having a diameter of 50 micrometers.
4. The raman laser modulation device according to claim 1, characterized in that said optical microcavity (210) is a disk structure.
5. A Raman laser modulation method applied to a Raman laser modulation apparatus (10) according to any one of claims 1 to 4, comprising:
s110, transmitting laser to the laser transmission channel (220);
s120, adjusting the positions of the laser transmission channel (220) and the optical microcavity (210) to enable the laser to be in resonance coupling with the optical microcavity (210);
s130, adjusting the input wavelength of the laser, and enabling the image displayed by the radio frequency spectrometer (340) to have a mechanical frequency comb phenomenon so as to generate Raman laser.
6. The raman laser modulation method according to claim 5, wherein the S130 includes:
s131, observing the image displayed by the radio frequency spectrometer (340);
s132, when the image displayed by the radio frequency spectrometer (340) has a mechanical frequency comb phenomenon, stopping adjusting the input wavelength of the laser;
s133, observing Raman laser generation using the spectrometer (310).
7. The raman laser modulation method according to claim 6, wherein the S130 includes:
the input wavelength of the laser is adjusted to increase stepwise in fixed steps.
8. The raman laser modulation method of claim 7, wherein the fixed step size is 0.003 nm.
9. The raman laser modulation method according to claim 5, further comprising:
s140, adjusting the laser to enable the mechanical frequency comb phenomenon on the image displayed by the radio frequency spectrometer (340) to disappear, and turning off the Raman laser.
10. The raman laser modulation method according to claim 9, wherein the S140 includes:
s141, adjusting the input wavelength of the laser;
s142, observing the image displayed by the radio frequency spectrometer (340);
s143, when the mechanical frequency combing phenomenon of the image displayed by the radio frequency spectrometer (340) disappears, stopping adjusting the input wavelength of the laser;
s144, using the spectrometer (310) to observe Raman laser disappearance.
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| CN202110666410.XA CN113410746B (en) | 2021-06-16 | 2021-06-16 | Raman laser modulation device and method |
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| CN202110666410.XA CN113410746B (en) | 2021-06-16 | 2021-06-16 | Raman laser modulation device and method |
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| CN105024269A (en) * | 2015-07-10 | 2015-11-04 | 北京大学 | Free-space optical micro-cavity Raman laser sensing device and sensing method thereof |
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| CN111555110A (en) * | 2020-04-16 | 2020-08-18 | 清华大学 | Raman laser modulation method and Raman laser modulation device |
| CN111555109A (en) * | 2020-04-16 | 2020-08-18 | 清华大学 | Dissipative gain coupled microcavity system |
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| WO2019217668A1 (en) * | 2018-05-09 | 2019-11-14 | Georgia Tech Research Corporation | Piezoelectric resonant-based mechanical frequency combs |
| CN111555110A (en) * | 2020-04-16 | 2020-08-18 | 清华大学 | Raman laser modulation method and Raman laser modulation device |
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