14 results about "Stark effect" patented technology

The invention relates to the field of quantum sensing, and provides an SERF atom magnetometer based on pi pulse pumping detection and a magnetic field detection method. According to the method, 770nm pumping light and 795nm detection light are modulated into an alternating pulse sequence through an acousto-optic modulator, optical frequency shift interference is avoided by adopting a time division multiplexing technology, and pumping pulses are configured to have a pi rotation effect so as to enhance atomic spin polarization. The device comprises an alkali metal gas chamber with multiple layers of magnetic shielding, a graphene heat conduction non-magnetic heating system based on infrared laser, a time division control light path module and a synchronous signal processing unit. Electric heating is replaced by laser heating to eliminate magnetic noise, a pulse interval tau adjustable mechanism is utilized to balance sensitivity and measuring range, and common-mode noise is suppressed in combination with differential photoelectric detection and phase-locked amplification technologies. The alternating current stark effect caused by continuous illumination and magnetic field interference of traditional heating are overcome, the magnetic field measurement precision, the system stability and the signal-to-noise ratio are improved, and a high-precision weak magnetic field detection scheme is provided for biomedical detection and quantum navigation.

The application discloses a vertical cavity surface emitting semiconductor laser based on a lateral epitaxial technology and a preparation method. The core of the structure is to solve the problem of presetting a lower DBR through the lateral epitaxial technology, to preset the DBR first, to open a window on the DBR, to grow the functional area of the laser on the upper side of the DBR through the lateral epitaxial technology, to complete the preparation of the lower DBR, and then to prepare the upper DBR and the metal electrodes on the two sides through common processes, so that the vertical cavity surface emitting laser is formed. The direction of the electric injection is perpendicular to the direction of the laser emission, and the influence of the current spreading layer of the ultraviolet band VCSEL on the light field absorption can be avoided. The application is favorable for reducing the damage to the device, improving the yield and the device performance, well utilizing the high-quality material area grown through the lateral epitaxial technology, improving the crystal quality, improving the light emitting efficiency and the service life, and the electric field direction is the non-polarized direction of the material, so that the quantum confinement Stark effect can be effectively reduced, and the reduction of the quantum efficiency and the wavelength drift of the device under a large voltage can be inhibited.

The present application relates to the technical field of quantum precision measurement, in particular to a Roland C signal receiving method and system based on Rydberg atoms, which utilizes atomic antennas to prepare Rydberg atoms in an alkali metal atom gas chamber to obtain an electromagnetically induced transparency (EIT) spectrum; a Roland C signal reaches the alkali metal atom gas chamber through free space, and the EIT spectrum produces an oscillation peak by utilizing the Stark effect of the Rydberg atoms; the coupling laser frequency is locked to the maximum position of the oscillation peak amplitude; by applying a direct current bias voltage to the parallel electrodes built in the alkali metal atom gas chamber, on the one hand, the received Roland C signal is corrected, and on the other hand, the alternating current Stark effect is amplified, so that the receiving sensitivity of the Roland C signal is significantly improved.

The present invention discloses a system and method for measuring the deuterium-tritium fuel ratio in plasma, comprising an electron cyclotron radiometer, a microwave reflectometer, a Mirnov probe, electron cyclotron radiation imaging, a first collector, a central processing unit, an interferometer, a dynamic Stark effect spectrometer, a magnetic coil, a charge exchange spectrometer, a second collector, a high-performance computer, and a TAE frequency real-time processor. The deuterium-tritium fuel ratio can be obtained by accurately measuring the frequency of the toroidal Alfvén eigenmode in the burning plasma and accurately calculating the TAE frequency in the deuterium-deuterium plasma under the same conditions. Compared to the existing technology, even if the burning plasma is in an uneven distribution state, it can be measured as a whole, and the deuterium-tritium fuel ratio can be calculated based on the measured data, thereby providing a safe, accurate, and rapid method for measuring the deuterium-tritium fuel ratio for the heating effect of fusion product alpha particles, the high and low confinement mode conversion power thresholds, and the confinement time.

A method of and system for monitoring the level of hydrogen peroxide gas in a system such as an isolation barrier. Gas is sampled from the system to a gas cell. The sampled gas may include hydrogen peroxide gas and water vapor. A laser beam from a laser source at a known polarization state is passed through the gas cell and the hydrogen peroxide gas and water vapor therein. An electrical field is created in the gas cell to reduce optical interference from water vapor while preserving the ability to more accurately measure the concentration of hydrogen peroxide gas in the gas cell. A change in the polarization state of the laser beam after passage through the gas cell is detected. Based on the detected change in the polarization state of the laser beam, the concentration of the hydrogen peroxide gas in the gas cell is determined.

The present invention provides technology that achieves more accurate measurement while preventing luminance saturation.　The present technology provides a measurement device, etc., comprising a light source capable of switching between pulse operation and CW operation, and a control unit that controls the switching between pulse operation and CW operation, wherein the light source includes a saturable absorber that exhibits a quantum-confined Stark effect (QCSE). The control unit may control a voltage applied to the saturable absorber to switch between pulse operation and CW operation.

The invention discloses a Rydberg atom EIT-Stark spectrum analysis method under the action of a low-frequency electric field. The method comprises the following steps: collecting an EIT-Stark spectrum signal under the action of the low-frequency electric field; performing smooth envelope extraction on the EIT-Stark spectral signal under the action of the low-frequency electric field to obtain an envelope signal; performing multi-scale wavelet analysis on the envelope signal, and extracting a transmission peak position to obtain a Stark frequency shift amount; and inverting the amplitude of the low-frequency electric field in combination with the Stark effect theory. According to the method, the influence of environment noise and measurement system noise on a measurement result is effectively avoided, the Stark frequency shift amount can be intuitively extracted, and low-frequency electric field measurement with wide bandwidth and large dynamic range can be accurately and reliably carried out.

The application relates to the technical field of semiconductor photoelectric devices, and discloses a semi-polar light-emitting device and a preparation method. The semi-polar light-emitting device comprises a first substrate, the first substrate comprises a ridge-shaped structure and a wing-shaped structure formed on the top of the ridge-shaped structure, the wing-shaped structure has inclined side walls extending from the center line of the top of the wing-shaped structure to both sides, and the inclined side walls are semi-polar surfaces; and a device layer, the device layer is grown on the inclined side walls of the wing-shaped structure and comprises, from bottom to top, an electron-providing layer, an active region comprising at least one quantum well, and a hole-providing layer. According to the application, the semi-polar gallium nitride substrate comprising the ridge-shaped structure and the wing-shaped structure can effectively inhibit quantum confinement Stark effect, the semi-polar surface makes the direction of the polarization electric field and the growth direction form a certain angle, thereby greatly weakening the harmful electric field along the growth direction, and the electron and hole wave function overlap degree is significantly increased.

A method of and system for monitoring the level of hydrogen peroxide gas in a system such as an isolation barrier. Gas is sampled from the system to a gas cell. The sampled gas may include hydrogen peroxide gas and water vapor. A laser beam from a laser source at a known polarization state is passed through the gas cell and the hydrogen peroxide gas and water vapor therein. An electrical field is created in the gas cell to reduce optical interference from water vapor while preserving the ability to more accurately measure the concentration of hydrogen peroxide gas in the gas cell. A change in the polarization state of the laser beam after passage through the gas cell is detected. Based on the detected change in the polarization state of the laser beam, the concentration of the hydrogen peroxide gas in the gas cell is determined.

The invention discloses a method for measuring the internal electric field intensity of ionic liquid, which combines probe molecules with infrared spectroscopy, calculates the internal electric field intensity of the ionic liquid according to the Stark effect, and can provide theoretical support for the research of an enhanced reaction and transfer process mechanism of the ionic liquid. The method has the advantages of low sample consumption, simple pretreatment, high test speed and the like.

This invention discloses a method for extracting EIT-Stark spectral features of Rydberg atoms, comprising the following steps: A signal acquisition module acquires the initial EIT-Stark spectral signal, performs wavelet transform, calculates wavelet coefficients, and plots a two-dimensional image of the wavelet coefficients; the wavelet coefficients of the EIT-Stark spectral signal undergo a natural logarithmic transform and are classified, the inter-class variance of the two classes of wavelet coefficients is calculated, an optimization objective function is established, and the peak search range is obtained using the optimization objective function; within the peak search range, the local maximum values ​​of the wavelet coefficients are obtained through a sliding window with a fixed step size, and the corresponding local maximum values ​​at adjacent scales are connected to obtain ridge lines; based on the position of the maximum wavelet coefficient value at any scale on the ridge line, the centroid position of the spectral peak of the EIT-Stark spectral signal is obtained. This method achieves accurate, automatic, and real-time extraction of transmission peak positions and movement features, providing a reliable data foundation for electric field measurement and promoting the engineering application of electric field measurement based on the EIT-Stark effect.

The present invention discloses a high-resolution one-dimensional range imaging method and system using a frequency-stepped radar based on Rydberg atoms. This method relates to the field of radar technology. By adding a direct current electric field to a Rydberg atom chamber and dynamically changing the magnitude of the direct current electric field, the DC-Stark effect is applied to control the atomic response to the microwave electric field frequency, thereby achieving real-time reception of stepped frequencies. To address the problem of low ranging resolution, the present invention modulates the Rydberg atom response to the microwave electric field frequency by regulating energy levels, achieving a GHz-level equivalent bandwidth. This method then synthesizes a high-bandwidth pulse signal through pulse synthesis, significantly improving the temporal resolution of the echo delay, thereby further resolving the technical challenge of low resolution in one-dimensional range imaging of Rydberg atoms.

A beam such as a laser beam a known polarization state is passed through the container. An electrical field is created in the container to reduce optical interference while preserving the ability to more accurately measure the concentration of one or more gasses in the container. A change in the polarization state of the beam after passage through the container is detected. Based on the detected change in the polarization state of the beam, the presence of the one or more gasses can be determined.

The invention belongs to the technical field of power system measurement, and relates to a direct-current electric field rapid measurement and harmonic identification method for a Rydberg atomic system, which comprises the following steps of: 1, constructing an optical detection channel, and forming a coherent superposition state (dark state) by the atomic system by adopting a two-photon excitation mode of coupling light and detection light, therefore, a characteristic narrow-linewidth EIT transparent window can appear in a transmitted spectrum; 2, a direct-current electric field is introduced, and the second-order displacement characteristic of Rydberg state energy level is caused by the Stark effect, so that an EIT transparent window generates frequency deviation corresponding to the electric field intensity in a quantitative mode; 3, through analysis and calculation, establishing a mapping relation between the frequency shift amount and the external electric field intensity for the target Rydberg state; according to the invention, on the premise of not changing an optical structure, low-frequency disturbance components such as power frequency and frequency multiplication harmonic waves thereof in a power system can be identified and quantified at the same time; therefore, the method can be widely applied to live detection, electric field distribution surveying and mapping, electric energy quality monitoring and other scenes of power system equipment.