4 results about "Stark effect" patented technology

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 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.

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.