5 results about "Crystal optics" patented technology

The application discloses a method for preparing a ferroelectric crystal optical superlattice by using a pyroelectric effect, a superlattice and application, and belongs to the field of electronic and optical devices. The method comprises the following steps: preparing a ferroelectric crystal material carrying an electrode pattern; heating the ferroelectric crystal material carrying the electrode pattern, and the heating temperature is 50-200 DEG C; in the temperature range, the ferroelectric crystal material carrying the electrode pattern is excited in the reverse direction of polarization by using the pyroelectric property of the ferroelectric crystal material itself; then, an annealing step is performed, and the annealing rate is 50-150 DEG C / h; after 1-10 times of heating and annealing cycles, the superlattice is obtained. The application breaks through the limitation of the external electric field polarization method for different electrode structures by creating a new polarization process, realizes the preparation of different superlattice crystals based on various structure electrodes, and further expands the application scenarios and application fields of the ferroelectric crystal material.

The invention provides a titanium sapphire crystal growth and post-treatment integrated continuous preparation device and method, a heating system of the device is a double-temperature-zone two-section heating body, the temperature gradient in a hearth is controlled through cooperation of an upper-section heating body and a lower-section heating body, and titanium sapphire crystal growth and in-situ constant-temperature annealing are achieved. During crystal growth, Al2O3 and Ti2O3 raw materials are loaded into the crucible, the crucible is integrally placed in the upper-section heating body, the bottom of the crucible is in contact with the heat exchange rod, and parameters such as hearth atmosphere and He gas flow are adjusted to complete crystal growth. And after crystallization is completed, replacing H2 + Ar mixed gas with H2, respectively adjusting the power of the upper and lower heating bodies to form a constant temperature field, and carrying out in-situ constant-temperature hydrogen annealing on the large-size titanium sapphire crystal. The temperature field gradient of crystal growth can be adjusted in real time, the preparation periods of titanium sapphire crystal growth, annealing and the like are shortened, the thermal stress in the crystal is reduced, the Ti < 4 + > concentration in the crystal is reduced, crystal cracking is inhibited, and the optical quality, the FOM value and the yield of the crystal are improved.

An optical device may include a bottom surface having a peripheral edge. The optical device may also include one or more first side surfaces extending from a peripheral edge of the bottom surface. Each first side may intersect the peripheral edge at a first interior angle of less than 180 DEG. The optical device may also include one or more second sides extending from the one or more first sides. Each of the one or more second sides may intersect with a respective one of the one or more first sides at a second interior angle less than 180 DEG. The optics may also include a tip connected with the one or more second sides.

The invention discloses an optical property prediction method of a fluoride laser crystal based on deep learning, which belongs to the technical field of deep learning and material science and comprises the following steps: constructing a source domain data set of the fluoride crystal with a crystal stability label, and training a source domain model by taking structural parameters and a chemical formula of the fluoride crystal as input to obtain a source domain model; obtaining a crystal stability prediction model; the constructed optical property prediction model comprises a feature extractor and a detection head which are connected in sequence, and the feature extractor is a structure branch GNN and a component branch CoTAN in the crystal stability prediction model; the detection head is used for mapping the features extracted by the feature extractor into a prediction result of the optical properties of the crystal; and inputting the obtained structure parameters and the chemical formula of the fluoride laser crystal to be predicted into the optical property prediction model to obtain an optical property prediction result. According to the method, the crystal stability prediction model is introduced into the optical property prediction process through transfer learning, the problem of scarcity of crystal optical data is solved, and the model prediction precision is improved.

The present application relates to the technical field of optical element detection, and discloses an optical element damage threshold detection system, which comprises a first light source, a switching device, a sample stage, an imaging device and a main controller. The main controller is used to control the switching device to switch the focused optical assembly on any optical mounting position to be located on the main light path of a test light beam. The focused optical assembly on different optical mounting positions comprises a single-lens focusing assembly and a beam-reducing mirror focusing assembly. The light beam shaped by the focused optical assembly is output to a specific point of the measured optical element for damage testing. The damage threshold detection result can be obtained by analyzing the detection images before and after the action of the test light beam using the imaging device. The optical element damage threshold detection system can adapt to the testing requirements of thin film and long crystal optical elements, thereby suppressing the self-focusing of the long crystal and improving the accuracy of the test result.