3 results about "Nonlinear dispersion" patented technology

The application discloses a linear dispersion spectrum confocal linear dispersion lens, which sequentially comprises a light splitting prism, a first lens assembly, a fifth lens, a diaphragm, a sixth lens, a second lens assembly and a tenth lens from an object side to an image side along an optical axis; the linear dispersion spectrum confocal linear dispersion lens is configured to meet the following conditions: an F number is 1.67, a focal length meets 150mm<=F1<=250mm, an object side numerical aperture meets 0.35<=NA1<=0.45, an object side line length meets 8mm<=L1<=12mm, an image side numerical aperture meets 0.23<=NA2<=0.3, and an image side line length meets 12mm<=L2<=15mm. The first lens assembly changes a light beam from a diffusion state to a converging state; the fifth lens and the sixth lens diverge the converging light beam and compensate for non-linear dispersion of the first lens assembly; the second lens assembly converges the light beam again; and the tenth lens expands a divergence angle of the light beam and corrects accumulated dispersion nonlinearity and aberration. It can be seen that the dispersion lens realizes a larger numerical aperture and a larger scanning line length at a light source end, the nonlinearity is only 0.5%, reaches an ultra-high precision standard, and the linear performance is extreme.

The invention discloses an optical fiber mode multiplexing quasi-homochromatic marginal light suppression super-resolution photoetching system. The system aims to solve the problem of nonlinear dispersion of femtosecond laser in optical fiber transmission and the problem of poor stability of annular suppression light spots generated by a traditional spatial light path. The core lies in three modules: firstly, a fiber-grating-fiber dispersion compensation module (a large-mode-field-diameter photonic crystal fiber is combined with a grating pair) is adopted, so that broadening of femtosecond pulses is effectively inhibited, and high-peak power required by inscribing is ensured; the optical fiber generation of an incoherent Hermite-Gaussian mode is realized, annular suppression and Gaussian excitation light spots (collectively called PPI light spots) with stable intensity distribution are synthesized, and the anti-interference capability of the system is remarkably improved. And parallel direct writing is realized through the multi-channel optical fiber array and the high-speed scanning module. According to the invention, the PPI light spot array with low dispersion and high stability is generated by using the optical fiber, the expansibility is good, and high-precision and high-flux three-dimensional super-resolution photoetching processing can be realized.

The present application relates to the field of phased array focusing regulation, and more particularly, the present application discloses a kind of electromagnetic wave phased array focusing energy regulation method and system of dipole array.First, based on medical image data and biological tissue relaxation parameter, construct the wideband complex frequency domain dielectric property space distribution reflecting nonlinear dispersion characteristics, based on the dynamic boundary smoothing of local space information entropy feature, the parameter mutation caused by image artifact is inhibited, and the corrected dielectric property distribution is obtained.The distribution is replaced by forced reverse to introduce virtual negative thermodynamic dissipation factor to static conductivity, excitation is injected into the target region, and pseudo-inverse electromagnetic evolution is carried out, so that the wave front information reaching each radiation port section is calculated from the target region, and the delay phase compensation amount and energy distribution weight coefficient for accurately controlling the radiation channel of phased array are obtained.The method can effectively improve the energy focusing accuracy and efficiency of the deep target region of biological tissue.