CN112764289A - Method for converting optical wavelength based on spherical magneto-optical material by using adjustable magnetic field - Google Patents
Method for converting optical wavelength based on spherical magneto-optical material by using adjustable magnetic field Download PDFInfo
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- CN112764289A CN112764289A CN202110028274.1A CN202110028274A CN112764289A CN 112764289 A CN112764289 A CN 112764289A CN 202110028274 A CN202110028274 A CN 202110028274A CN 112764289 A CN112764289 A CN 112764289A
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
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Abstract
The invention discloses a method for converting optical wavelength based on spherical magneto-optical materials by using an adjustable magnetic field, and relates to the field of optical frequency conversion; the method specifically comprises the following steps: firstly, building a physical model comprising a laser, a microsphere cavity, a microwave signal generator, an optical fiber, a filter and an oscilloscope; opening the laser, finding the optimal space distance between the microsphere cavity and the optical fiber by adjusting the shifter and the telescopic bracket, and transmitting the laser emitted by the laser to the microsphere cavity; meanwhile, the micro-sphere cavity combines the electromagnetic field and the self material to obtain the microwave frequency; the microwave signal generator generates microwave signals according to microwave frequency and inputs the microwave signals into the microsphere cavity; the laser frequency is combined with the microwave frequency, new photons are generated by energy conservation under the action of the optical field-spin wave of the microsphere cavity, and the wavelength conversion of input light and the new photons is realized; the output passes through the filter and the optical detector in sequence and is finally displayed by the oscilloscope; the invention regulates and controls wavelength conversion through the microwave cavity, and does not need physical contact among devices.
Description
Technical Field
The invention relates to the field of optical frequency conversion, in particular to a method for converting optical wavelength based on spherical magneto-optical materials by using an adjustable magnetic field.
Background
The optical microcavity is a device capable of highly localizing a light field in a small space, and the light field manipulation in the optical microcavity has an extremely high efficiency-volume ratio. For an optical microcavity with a closed optical path structure, the mode in which the optical field operates is called a whispering gallery mode, and the whispering gallery mode is formed based on the total reflection of light in the whispering gallery optical cavity, the whispering gallery mode can exist stably only when the path through which the light passes in the cavity forms a closed path and the length of the path is an integral multiple of the wavelength of the light. The frequency corresponding to this wavelength is equal to the constant of the speed of light divided by the wavelength, is the eigenfrequency (wavelength) of the optical cavity, and is also the absorption frequency when the whispering gallery microcavity is swept, and this wavelength and frequency are also the operating wavelength and frequency of the optical cavity. Due to the existence of echo wall microcavity dissipation, the operating wavelength is not solitary, but rather exhibits a broadening, called the operating bandwidth, which is inversely proportional to its quality factor centered around the eigenfrequency (wavelength).
In addition, there is a geometry-induced anisotropy of the material for transverse magnetic and transverse electric modes at the geometrical boundaries, which makes the operating wavelength of the transverse magnetic mode generally lower than that of the transverse electric mode.
Under the action of an external magnetic field and a microwave field, electrons in the magneto-optical material can generate collective regular oscillation and precession along a certain direction, waves formed by the oscillation are called spin waves or magnetons, and the magneto-optical material is different from the conventional magneto-deformation scheme which is greatly influenced by a temperature processing process, and the spin wave scheme only relates to the movement of the electrons in the material, so that the magneto-optical material has higher stability. The precession frequency or the frequency of the spinning wave is the product of the gyromagnetic ratio of the material and the magnetic field intensity. When a transverse electric mode light wave is input, the transverse electric mode light wave is scattered by the spin wave in a forward direction to generate a homodromous transverse magnetic mode wave with the frequency difference of the spin wave frequency, and the change of the light wave frequency marks the change of the light wave wavelength.
In the prior art, wavelength modulation of light waves is usually completed through an electro-optic effect, and the basic principle is that an optical signal is converted into an electrical signal through a photoelectric detector, and then the electrical signal is used for driving a laser with the wavelength as required frequency, so that conversion of the light wavelengths is realized. The modulation speed of the instrument is limited by the speed of electronic devices, and the instrument is not suitable for the requirements of high-speed large-capacity optical fiber communication systems and networks.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for converting light wavelength based on spherical magneto-optical materials by using an adjustable magnetic field, which realizes wavelength conversion by regulating and controlling the magnetic field of light wavelength in an optical microcavity, is simple to operate and improves the precision.
The method for converting the light wavelength based on the spherical magneto-optical material by using the adjustable magnetic field comprises the following specific steps:
step one, building a physical model of a spherical magneto-optical material;
the physical model comprises the following components: the laser is coupled with one end of an optical fiber through a flange, the optical fiber is placed above the core component, the other end of the optical fiber is connected with a filter through the flange, the filter is connected with a light detector, and the light detector is connected with an oscilloscope;
the core assembly comprises: the microwave cavity, the electro-magnet, antenna and microwave signal generator.
The microwave signal generator is connected with the antenna through a signal cable, and transmits microwave signals to the microsphere cavity through the antenna, and the microsphere cavity is positioned in the range of an external magnetic field; the microsphere cavity is placed on the shifter, and the shifter is moved to drive the microsphere cavity to move up and down.
The connection of optic fibre and microballon chamber specifically is:
two telescopic supports are arranged above the outer side of the microsphere cavity, optical fibers are carried on the supports, and the distance between the optical fibers and the microsphere cavity is adjusted by adjusting the length of the telescopic supports;
opening a laser, and finding the optimal space distance between the microsphere cavity and the optical fiber by adjusting the shifter and the telescopic bracket;
the method specifically comprises the following steps:
firstly, turning on a laser, adjusting a shifter for coarse adjustment, moving a microsphere cavity upwards to a laser scanning range in an optical fiber, then adjusting a telescopic support for fine adjustment, and moving the microsphere cavity upwards to a range coupled with the optical fiber;
and finally, adjusting the polarization of the laser to enable the micro-sphere cavity to reach a transverse electric vibration mode, wherein when an output valley with obvious laser frequency spectrum appears in an oscilloscope, the optimal coupling distance between the optical fiber and the micro-sphere cavity is obtained, and the position of an absorption valley at the moment is the working wavelength.
Fixing the microsphere cavity at the optimal distance, and transmitting laser emitted by a laser to the microsphere cavity;
step four, the magnetic field emitted by the electromagnet enters the microsphere cavity, and the frequency of the microwave is obtained by combining the material of the microsphere cavity;
the method specifically comprises the following steps: the microwave frequency b is equal to the magnetic field strength s multiplied by the material gyromagnetic ratio gamma of the microsphere cavity: b is sxy;
fifthly, the microwave signal generator generates microwave signals according to the microwave frequency and inputs the microwave signals into the microsphere cavity;
combining the laser frequency output by the laser with the adjustable frequency input by the microwave generator, and generating new photons due to energy conservation under the action of the microsphere cavity light field-spin wave to realize the wavelength conversion of the input laser and the new photons;
the method specifically comprises the following steps:
the microwave frequency emitted by the microwave generator is the spin wave frequency generated by the microsphere cavity, and the difference between the input frequency of the laser and the spin wave frequency is the new photon frequency according to the energy conservation law, so that the conversion between the input laser frequency and the new photon frequency is realized; the conversion of the wavelength of light is obtained in combination with the speed of light.
Synchronously adjusting the microwave frequency and the magnetic field intensity, observing the measurement reading through an oscilloscope, and determining the wavelength of a new photon frequency spectrum peak value and the corresponding full width at half maximum; the microwave frequency and magnetic field strength are continuously varied simultaneously to determine the location and extent of the new photon peak, which is the wavelength conversion region.
Seventhly, the output in the microsphere cavity sequentially passes through a filter and a light detector and is finally displayed by an oscilloscope;
and the output end is connected with a filter device or transverse magnetic/transverse electric beam splitting device with the polarization in the transverse magnetic wave direction. The transverse magnetic wave is the light wave after wavelength conversion.
The invention has the advantages that:
1) the method for converting the optical wavelength based on the spherical magneto-optical material by using the adjustable magnetic field adopts the microsphere cavity to convert the wavelength, and the size of a core device is in a micrometer scale, so that integration can be carried out to be used as a part of an integrated optical path.
2) The method for converting the light wavelength based on the spherical magneto-optical material by using the adjustable magnetic field regulates and controls wavelength conversion through the microwave cavity, and physical contact between devices is not needed, so that the method is more stable.
Drawings
FIG. 1 is a flow chart of a method for converting light wavelengths based on spherical magneto-optical materials using an adjustable magnetic field according to the present invention;
FIG. 2 is a physical model of the spherical magneto-optical material constructed by the invention;
FIG. 3 is a core assembly of spherical magneto-optical materials according to the present invention;
FIG. 4 is a front and side view of a microcavity structure having both optical and magnetic modes according to the present invention.
Detailed Description
The present invention will be described in further detail and with reference to the accompanying drawings so that those skilled in the art can understand and practice the invention.
The invention discloses a method for converting optical wavelength based on a spherical magneto-optical material by using an adjustable magnetic field, which adopts a polished magneto-optical spherical material, wherein the spherical material generates magnetic spin waves under the action of an external magnetic field and a microwave excitation field; the frequency of the spin wave is proportional to the external magnetic field strength and the frequency of the microwave excitation field, so that the frequency can be modulated by the magnetic field strength. In addition, the input light is input into the spherical cavity through the optical fiber and the light processed by the spherical cavity is collected, the input light can collide with the spin wave to generate inelastic scattering, and the inelastic scattering meets the energy conservation condition: i.e. the frequency of the input light minus the frequency of the spinning wave equals the frequency of the generated converted light. For light waves, the frequency values and the wavelength values of the light waves are in one-to-one correspondence, so that the light wavelength converter can realize the regulation and control of an external magnetic field. Based on the principle, the wavelength conversion of 1-6GHz can be realized in a spherical structure taking the yttrium iron garnet as a base material.
The method for converting the light wavelength based on the spherical magneto-optical material by using the adjustable magnetic field comprises the following specific steps:
step one, building a physical model of a spherical magneto-optical material;
as shown in fig. 2, the physical model includes: the laser is coupled with one end of an optical fiber through a flange, the optical fiber is placed above the core component, the other end of the optical fiber is connected with a filter through the flange, the filter is connected with a light detector, and the light detector is connected with an oscilloscope;
in the embodiment, the laser uses NEW FOCUS TLB-6728;
the core assembly comprises: the microwave cavity, the electro-magnet, antenna and microwave signal generator.
The microwave signal generator is connected with the antenna through a signal cable, and transmits microwave signals to the microsphere cavity through the antenna, and the microsphere cavity is positioned in the range of an external magnetic field; the microsphere cavity is placed on the shifter, and the shifter is moved to drive the microsphere cavity to move up and down.
The microwave signal generator adopts a microwave transmitter which can unidirectionally transmit microwaves with adjustable frequency.
The microsphere material adopts one of yttrium iron stone, ferric fluoride and Bi-doped rare earth iron garnet stone; the microspheres are prepared from magneto-optic materials, and yttrium iron stone ballast spheres are adopted in the embodiment;
the connection between the optical fiber and the microsphere cavity is specifically as shown in fig. 3:
two telescopic supports are arranged above the outer side of the microsphere cavity, optical fibers are carried on the supports, and the distance between the optical fibers and the microsphere cavity is adjusted by adjusting the length of the telescopic supports;
the optical fiber is made of one of silicon dioxide, silicon nitride, lithium niobate, aluminum nitride, gallium nitride and germanium.
Opening a laser, and finding the optimal space distance between the microsphere cavity and the optical fiber by adjusting the shifter and the telescopic bracket;
the method specifically comprises the following steps:
firstly, opening a laser, adjusting a shifter for coarse adjustment, moving a microsphere cavity upwards to a laser scanning range in an optical fiber, then adjusting a telescopic bracket for fine adjustment, and moving the microsphere cavity upwards to a range coupled with the optical fiber, wherein the range is about 200-500 nm;
finally, the polarization of the laser is adjusted to enable the micro-sphere cavity to reach a transverse electric vibration mode, and when an output valley of the laser with obvious frequency spectrum appears in an oscilloscope, the optimal coupling distance between the optical fiber and the micro-sphere cavity is obtained; and reading out a point corresponding to the transmission minimum value in a spectral line displayed on an oscilloscope, wherein the point is an absorption valley, and the position of the absorption valley is the working wavelength.
Fixing the microsphere cavity at the optimal distance, and transmitting laser emitted by a laser to the microsphere cavity;
step four, the magnetic field emitted by the electromagnet enters the microsphere cavity, and the frequency of the microwave is obtained by combining the material of the microsphere cavity;
the method specifically comprises the following steps: the microwave frequency b is equal to the magnetic field strength s multiplied by the material gyromagnetic ratio gamma of the microsphere cavity: b is sxy;
fifthly, the microwave signal generator generates microwave signals according to the microwave frequency and inputs the microwave signals into the microsphere cavity;
combining the laser frequency output by the laser with the adjustable frequency input by the microwave generator, and generating new photons due to energy conservation under the action of the microsphere cavity light field-spin wave to realize the wavelength conversion of the input laser and the new photons;
the method specifically comprises the following steps:
the microwave frequency emitted by the microwave generator is the spin wave frequency generated by the microsphere cavity, the spin wave frequency is determined by the cooperation of an external magnetic field and an input microwave signal, and the spin wave frequency is in direct proportion to the external magnetic field intensity and the input microwave signal. Modulating the frequency of a spinning wave in the microsphere cavity by modulating the input magnetic field intensity and cooperatively modulating the input microwave frequency; the difference between the input frequency of the laser and the spin wave frequency is the new photon frequency according to the law of energy conservation, so that the conversion between the input laser frequency and the new photon frequency is realized; this is also a light wavelength conversion because the wavelength of the light wave is equal to the ratio of the speed of light to the frequency of light as a constant.
Synchronously adjusting the microwave frequency and the magnetic field intensity, observing the measured reading through an oscilloscope, enabling a peak value to appear in a new wave band except for input laser, determining the wavelength and the corresponding full width at half maximum of a new photon frequency spectrum peak value corresponding to the position of a resonance peak at the moment; and continuously changing the microwave frequency and the magnetic field intensity until the peak disappears, wherein the range in which the peak does not disappear is the wavelength conversion region.
Seventhly, the output in the microsphere cavity sequentially passes through a filter and a light detector and is finally displayed by an oscilloscope;
and the output end is connected with a filter device or transverse magnetic/transverse electric beam splitting device with the polarization in the transverse magnetic wave direction. The transverse magnetic wave is the light wave after wavelength conversion.
The invention comprises the following steps: the optical micro-cavity is made of magneto-optical material, the optical fiber is coupled with the optical micro-cavity, the filter is in transverse electric transverse magnetic mode, the magnetic field is used for exciting spin wave, and the microwave generator is used for generating the spin wave. Wherein the optical fibers ensure driving the optical cavity and collecting the optical wave field after frequency conversion, the magnetic field and the microwave generator can be used to modulate the wavelength to be converted.
Examples
The laser light source is a standard communication light source, namely laser with the wavelength of about 1550nm, and the power is 0.03 mw.
Firstly, scanning laser, coupling an optical fiber with a microsphere cavity through a thickness adjusting shifter and a telescopic bracket, and finding out the optimal coupling position through an output valley and an absorption valley;
then, the magnetic field and the microwave field are switched on to synchronously adjust the magnetic field intensity and the microwave frequency, when the magnetic field intensity is about 1840 oersted and the microwave frequency is about 5.61 gigahertz, an oscilloscope is used for detecting, and the magnetic field intensity and the microwave frequency are continuously changed, at this time, the accompanying side band is changed from the cavity to be weak, and finally is changed to be strong, the strongest frequency in the frequency change process is the converted central frequency, and the side band with the frequency spectrum is the convertible bandwidth.
And finally, opening a filtering part, wherein light collected by the optical detector is the light after frequency conversion, and the light frequency can be converted in the device performance range by adjusting the magnetic field intensity and the microwave frequency.
Finally, it is noted that the disclosed embodiments are intended to aid in further understanding of the invention, but those skilled in the art will appreciate that: various substitutions and modifications are possible without departing from the spirit and scope of the invention and the appended claims. Therefore, the invention should not be limited to the embodiments disclosed, but the scope of the invention is defined by the appended claims.
Claims (4)
1. A method for converting optical wavelength based on spherical magneto-optical material by using an adjustable magnetic field is characterized by comprising the following specific steps:
step one, building a physical model of a spherical magneto-optical material;
the physical model comprises the following components: the laser is coupled with one end of an optical fiber through a flange, the optical fiber is placed above the core component, the other end of the optical fiber is connected with a filter through the flange, the filter is connected with a light detector, and the light detector is connected with an oscilloscope;
the core assembly comprises: the microwave cavity comprises a micro-sphere cavity, an electromagnet, an antenna and a microwave signal generator;
the microwave signal generator is connected with the antenna through a signal cable, and transmits microwave signals to the microsphere cavity through the antenna, and the microsphere cavity is positioned in the range of an external magnetic field; the microsphere cavity is placed on the shifter, and the shifter is moved to drive the microsphere cavity to move up and down;
the connection of optic fibre and microballon chamber specifically is:
two telescopic supports are arranged above the outer side of the microsphere cavity, optical fibers are carried on the supports, and the distance between the optical fibers and the microsphere cavity is adjusted by adjusting the length of the telescopic supports;
opening a laser, and finding the optimal space distance between the microsphere cavity and the optical fiber by adjusting the shifter and the telescopic bracket;
fixing the microsphere cavity at the optimal distance, and transmitting laser emitted by a laser to the microsphere cavity;
step four, the magnetic field emitted by the electromagnet enters the microsphere cavity, and the frequency of the microwave is obtained by combining the material of the microsphere cavity;
fifthly, the microwave signal generator generates microwave signals according to the microwave frequency and inputs the microwave signals into the microsphere cavity;
combining the laser frequency output by the laser with the adjustable frequency input by the microwave generator, and generating new photons due to energy conservation under the action of the microsphere cavity light field-spin wave to realize the wavelength conversion of the input laser and the new photons;
the method specifically comprises the following steps:
the microwave frequency emitted by the microwave generator is the spin wave frequency generated by the microsphere cavity, and the difference between the input frequency of the laser and the spin wave frequency is the new photon frequency according to the energy conservation law, so that the conversion between the input laser frequency and the new photon frequency is realized; combining the light speed to obtain the conversion of the light wavelength;
synchronously adjusting the microwave frequency and the magnetic field intensity, observing the measurement reading through an oscilloscope, and determining the wavelength of a new photon frequency spectrum peak value and the corresponding full width at half maximum; continuously changing the microwave frequency and the magnetic field intensity to determine the position and the range of a new photon peak value, wherein the position is a wavelength conversion area;
and seventhly, sequentially passing the output in the microsphere cavity through a filter and a light detector, and finally displaying the output through an oscilloscope.
2. The method for converting light wavelength based on spherical magneto-optical material by using tunable magnetic field as claimed in claim 1, wherein the second step is specifically: firstly, turning on a laser, adjusting a shifter for coarse adjustment, moving a microsphere cavity upwards to a laser scanning range in an optical fiber, then adjusting a telescopic support for fine adjustment, and moving the microsphere cavity upwards to a range coupled with the optical fiber;
and finally, adjusting the polarization of the laser to enable the micro-sphere cavity to reach a transverse electric vibration mode, wherein when an output valley with obvious laser frequency spectrum appears in an oscilloscope, the optimal coupling distance between the optical fiber and the micro-sphere cavity is obtained, and the position of an absorption valley at the moment is the working wavelength.
3. The method for converting light wavelength based on spherical magneto-optical material by using adjustable magnetic field as claimed in claim 1, wherein said step four is specifically: the microwave frequency b is equal to the magnetic field strength s multiplied by the material gyromagnetic ratio gamma of the microsphere cavity: b is sxy.
4. The method for converting light wavelength based on spherical magneto-optical material by using tunable magnetic field as claimed in claim 1, wherein the seventh step is specifically: the output end is connected with a filter device or a transverse magnetic/transverse electric beam splitting device with the polarization in the transverse magnetic wave direction; the transverse magnetic wave is the light wave after wavelength conversion.
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| CN113358576A (en) * | 2021-06-03 | 2021-09-07 | 北京邮电大学 | Full silicon dioxide spinning device simulation method |
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| CN110471199A (en) * | 2019-07-29 | 2019-11-19 | 中国科学技术大学 | Isolator based on light Quantum geometrical phase and Faraday effect |
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