Lead halide perovskite nanocrystals have established the special consideration of scholars in the last few years due to their cutting-edge nonlinear optical properties and progress in unpretentious synthetic procedures. These materials have efficient applications in various optoelectronic devices. Th enhancement of nonlinear optical properties of the perovskites can be influenced by doping of transition metal ions.
Based on the linear-scan image recognition method, "image-type angular displacement measurement (I-ADM) technology" is a new photoelectric displacement measurement technology. I-ADM can achieve higher resolution than the traditional measurement methods when the line density of grating code disc is not high, and can achieve higher measurement frequency response.
The neural network has great application value in aviation security. Using the neural network method to monitor the status of aircraft landing gear can improve the intelligence, stability and objectivity of airport operation.
Vertical-cavity surface-emitting lasers (VCSELs) present many attractive properties, such as surface emission, circular and low divergent output beam. Single-transverse mode VCSELs (SM-VCSELs) are preferred optical sources for small chip-scale atomic sensors, including atomic clocks, magnetometers, and gyroscopes. VCSEL is required to work at high temperatures with single-mode and high output power in the application of nuclear magnetic resonance gyroscope (NMRG).
The advantage of Two-photon pumped alkali vapor lasers (TPALs) is the realization of cascading and coaxial output of blue-violet photons and midinfrared photons, which can be used in many fields of military and scientific research, such as multi-wavelength detection, underwater communication, and photoelectric countermeasures.
Wavefront reconstruction and correction under strong atmospheric turbulence conditions have become a crucial issue in adaptive optics. An approach based on plenoptic sensor can precisely reconstruct disturbed wavefront under strong atmospheric turbulence. However, the existing reconstruction algorithm has difficulty in reconstructing residual aberrations.