11 results about "Resonator mode" patented technology

The invention provides an optical frequency comb self-starting device and method. A laser generates a pump light signal; the photon chip outputs an optical frequency comb signal and transmits a pump light signal, the photon chip comprises an optical microresonator and a coupling waveguide, and the optical microresonator and the coupling waveguide are both provided with tuning electrodes; the acquisition system monitors a pump light signal and an optical frequency comb signal in real time; and the control system automatically identifies a mode locking signal according to a monitoring result, judges whether the optical frequency comb reaches a mode locking state or not, adjusts the pumping current and the tuning electrode voltage according to the mode locking signal, and generates a mode locking state optical frequency comb signal of a target wavelength. According to the invention, the mode of the laser and the mode of the micro-resonator can be automatically interlocked, the mode-locked state optical frequency comb can be generated without manual intervention, and the mode-locked state optical frequency comb signal with continuously tunable wavelength can be automatically and controllably generated through the coordinated adjustment of multiple parameters such as tuning electrode voltage and pumping current and the automatic identification of the mode-locked state.

A filter manufacturing method and a filter manufactured by the filter manufacturing method are disclosed. The filter manufacturing method includes designating a use mode in a resonator to a first resonance mode, in response to designating to the first resonance mode, setting a band selected from a designated first frequency band to a passband in the resonator, switching the use mode in the resonator from the first resonance mode to a second resonator mode, in response to switching to the second resonance mode, setting a band selected from the first frequency band except for the passband to a stopband in the resonator, and manufacturing a primary filter including the resonator to which the passband and the stopband are set.

The application discloses a passive optical resonant cavity mode matching method based on an additional external cavity, and comprises the following steps: establishing a resonant cavity theoretical model based on actual requirements of a required resonant cavity; the resonant cavity comprises an incident end cavity mirror and an emission end cavity mirror; the radius of collimated laser of the incident resonant cavity is determined according to the resonant cavity theoretical model; the image sensor is used to observe the light spot center of the transmitted light beam passing through the incident end cavity mirror, and the incident end cavity mirror is adjusted to be coaxial with the incident light beam; a resonant cavity is built by a partial mirror and the incident end cavity mirror to obtain an additional external cavity; the position of the incident end cavity mirror is adjusted by using the additional external cavity to realize the matching of the wavefront of the incident light beam and the surface curvature of the incident end cavity mirror; the image sensor is used to observe the resonant cavity transmission light mode image, and the position of the emission end cavity mirror is adjusted to realize the resonant cavity mode matching. The method can accurately judge the wavefront matching condition of the resonant cavity mirror surface by constructing an additional resonant cavity; the sequence of optical path adjustment is clear, and the mode matching process is simple and efficient.

Described herein is Complex Dielectric Constant Sensor (CDCS) incorporating microstrip based radial stub and open circuit stub pair structures that utilize interference coupling between degenerate EIT modes to detect CDC of sample-under-test (SUT). In at least one embodiment, CDCS generates two distinct EIT modes when sensor is unloaded. In at least one embodiment, coupling between resonator modes and interaction of electromagnetic fields with material is affected indicating presence of dielectric sample. In at least one embodiment, two EIT modes become degenerate, causing cancellation and suppressing transparency window when dielectric constant of SUT matches a specific value. In at least one embodiment, CDCS can detect slight changes in complex dielectric properties of SUT. In at least one embodiment, CDCS can characterize materials such as substrate samples based on their CDCs for design and characterization of microwave devices, antennas, and thin film devices.

A high-conversion-efficiency integrated frequency comb device (100; 200; 310a – 310c) comprises at least one micro-resonator (120; 220) configured to receive pump laser light from at least one pump laser source, convert at least partially the received pump laser light for generating a laser frequency comb, and output frequency comb light based on the produced laser frequency comb. The micro-resonator (120; 220) comprises at least one closed-circuit waveguide (122; 222) integrated in a semi-conductor topography of the micro-resonator (120; 220). The closed-circuit waveguide (122; 222) comprises at least one structure for producing periodic perturbation (124; 224) configured to produce mode hybridization via coupling of forwards and backwards travelling modes in the closed-circuit waveguide (122; 222) by means of rapid, in particular sub-wavelength, modulation of a propagation constant of light propagating in the closed-circuit waveguide (122; 222). The structure for producing periodic perturbation (124; 224) has been designed with respect to at least one of an intended width, in terms of comb lines, of the frequency comb and / or an intended intensity distribution within a target width, in terms of comb lines, of the frequency comb, based at least partially on the stipulation that a dispersion-loss operator to achieve an ideally flat microcomb according to an exact solution of a generalized Lugiato-Lefever Equation exists in the form [iD+K], and, as a function of resonator mode index μ, the dispersion-loss operator takes the following generic form: wherein a, b, c, d 3 ... d ∞ , h, p, q, r, s, u 3 , u ∞ are constants, and μ ≤ N / 2 for N being the number of intended comb lines apart from a potential comb line corresponding to the pump laser light.

Method for stabilizing a non-linear parametric amplifier array comprising N non-linear resonator modes, linear and non-linear couplings between sites, external coherent control fields on each site and input / output ports to send and retrieve an amplified signal; the method comprising: setting the phases of the external coherent control fields to grow linearly with site index, dividing the N sites of the array in 3 regions, setting, in the central region, an homogeneous steady-state solution, assuming periodic boundary conditions, and setting the central quantities to produce directional topological amplification in an homogeneous system; in the left and right buffer regions, imposing to some quantities a smoothly increasing or decreasing profile function from the boundaries to the center; choosing external coherent control frequencies or bare resonator frequencies to locally compensate for the photon number-dependent frequency shifts induced by non-linearities; and solving the exact steady-state mean-field displacements assuming open boundary conditions.

The invention relates to an apparatus (9) for detecting at least two trace gases in exhaled air, containing a first photoacoustic measuring device (1) having a first acoustic resonator (10), at least one first microphone (11) and at least one first light source (12), a device (3) for detecting a resonant frequency of a resonator mode of the first acoustic resonator (10), a device (4) for modulating the first light source (12) with the resonant frequency of the resonator mode, wherein the apparatus (9) also contains a second photoacoustic measuring device (2) having a second acoustic resonator (20), at least one second microphone (21) and at least one second light source (22), wherein the device for modulating the first light source (12) is designed to also modulate the second light source (22) with the resonant frequency of the resonator mode of the first acoustic resonator (10) or a further device (3) is provided for detecting a resonant frequency of a resonator mode of the second acoustic resonator (20) and a further device (4) is provided for modulating the second light source (12) with the resonant frequency of the resonator mode of the second acoustic resonator (20). The invention further relates to a method for determining at least two trace gases in exhaled air.

Laser device (100) comprising: - a substrate (10) on the surface of which an optical waveguide (11) is arranged, which contains an optical resonator (12, 13) with a resonator length such that at least one resonator mode in the resonator (12, 13) forms a standing wave, and - a gain medium arranged on a surface of the optical waveguide (11) and comprising a plurality of semiconductor elements (21) arranged periodically on the surface of the optical waveguide (11) in a manner projecting from the optical waveguide (11), wherein: - the gain medium is arranged for optical interaction with the at least one resonator mode of the optical resonator (12, 13) and for amplifying light having a wavelength of the at least one resonator mode of the optical resonator (12, 13), - the gain medium comprises a photonic crystal (20) and the semiconductor elements (21) are columnar and / or wall-shaped semiconductor elements (21), and - a diffractive coupling is formed between the photonic crystal (20) and the optical resonator (12, 13), in which standing light waves in the optical resonator (12, 13) are extended to the photonic crystal (20), characterized in that - a periodicity of the arrangement of the semiconductor elements (21) defines a coupling wavelength which is coupled between the semiconductor elements (21) and the waveguide (11), wherein the coupling wavelength and a resonance wavelength defined by the resonator length of the optical resonator (12, 13) are simultaneously selected such that the resonance wavelength in the waveguide (11) matches the coupling wavelength.

The application provides a resonator capacitance medium charge accumulation effect characterization method and device, comprising obtaining a regular, stable frequency signal and angle signal output in a stable angular velocity self-precession state of a resonator mode shape; Fourier fitting is performed on the frequency signal and the change of the angle signal every fixed time to obtain a fitting waveform corresponding to the fixed time period; the highest frequency point and the lowest frequency point in the fitting waveform of each fixed time period are obtained to determine the frequency difference between the highest frequency point and the lowest frequency point in each fixed time period; the characterization of the stiffness change in the resonator is completed based on the change relationship between the frequency difference and the applied stiffness in the resonator dynamics model; and the relationship between the equivalent bias voltage generated by the charge accumulation and the equivalent electrostatic negative stiffness generated by the charge accumulation is obtained according to the negative stiffness effect. The method can accurately characterize the change characteristics of the charge accumulation in the charging and discharging process of the capacitance medium.

A ring cavity laser (10) based on a semiconductor gain medium providing a lasing transition between quantised energy bands. The laser's ring cavity (12) possesses a plurality of modes, at least one of which having a frequency around which sufficient gain can be generated to cause lasing action. An electrical driver circuit applies an injection current to the semiconductor gain medium to cause population inversion and lasing action. A modulator (18) provides phase modulation within the cavity optical path at a modulation frequency near- resonant with an integer multiple or fraction of one of the mode frequencies. The phase modulation causes the laser to output a stable optical frequency comb which is established by random quantum walk in a photonic lattice created by said mode and its neighbouring resonator modes. A random quantum walk arises when these modes are coupled by the phase modulation.

A ring cavity laser (10) based on a semiconductor gain medium providing a lasing transition between quantised energy bands. The laser's ring cavity (12) possesses a plurality of modes, at least one of which having a frequency around which sufficient gain can be generated to cause lasing action. An electrical driver circuit applies an injection current to the semiconductor gain medium to cause population inversion and lasing action. A modulator (18) provides phase modulation within the cavity optical path at a modulation frequency near- resonant with an integer multiple or fraction of one of the mode frequencies. The phase modulation causes the laser to output a stable optical frequency comb which is established by random quantum walk in a photonic lattice created by said mode and its neighbouring resonator modes. A random quantum walk arises when these modes are coupled by the phase modulation.