10 results about "Stark effect" patented technology

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.

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 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.

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.