Anti-biofouling superhydrophobic surface fabricated by picosecond laser texturing of stainless steel

Laser-induced thermal damages of a silicon wafer surface subjected to continuous near-infrared laser irradiation were investigated. Silicon wafer specimens were illuminated by a continuous-wave fiber laser beam (1070-nm wavelength) with irradiances from 93 to 186  W/cm 2 , and the surface morphology of each specimen was analyzed using optical microscopy. With increasing irradiance, straight cracks in the direction appeared first, and partial melting and complete melting were subsequently observed. The mechanism of these laser-induced thermal damages in the silicon wafer surface was discussed with numerical analysis based on the heat transfer and thermoelasticity model. The irradiances initiating the cracking and melting were predicted by determining the irradiances in which the calculated thermal stress and temperature exceeded the corresponding limits of the fracture strength and melting point, respectively. These predictions agreed well with the experimental findings. Laser-induced thermal damages of the silicon wafer surface subjected to a continuous near-infrared laser irradiation were identified based on these investigations.

https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-53/issue-1/017103/Thermal-damages-on-the-surface-of-a-silicon-wafer-induced/10.1117/1.OE.53.1.017103.pdf

Thermal damages on the surface of a silicon wafer induced by a near-infrared laser

Propagation of elegant Laguerre Gaussian beam through a misaligned optical system

Propagation properties of partially coherent radially and azimuthally polarized vortex beams in turbulent atmosphere

Theoretical study of misalignment analysis of the holophote and self-phase locking of axisymmetrical-structural CO2 laser

Based on the injection-locking principle, the phase-locking mechanisms of axisymmetricfold combination CO2 lasers are analyzed. Then influences of parameters-changes on phase-locking are studied in detail, such as changes of cavity length and curvature radius, linewidth, phase error, and coherence time. It is shown that these factors almost do not influence the degree of mode coupling, but they could influence distribution of light intensity to some degree. Phase-locking can improve the value of maximum light intensity significantly; what is more, the numerical calculation indicates that the higher the fringe visibility the better the coherence.

Phase-locking principle of axisymmetric structural CO_2 laser and theoretical study of the influences of parameters-changes on phase-locking

Analytical formulas for average intensity of partially coherent twisted Laguerre-Gaussian beam (PCTLGB) propagating through anisotropic atmospheric turbulence are derived based on the extended Huygens–Fresnel principle. Our results indicate that PCTLGB gradually evolves from dark hollow distribution to flat-topped distribution and finally degenerates to Gaussian distribution both in free space and atmospheric turbulence. We also find that the effect of atmospheric turbulence on propagation characteristics for PCTLGB can be effectively reduced by adjusting twisted factor, topological charge and beam order. An important result is that PCTLGB has stronger anti-turbulence ability when vortex phase and twisted phase have the same chirality, and it can resist atmospheric turbulence more effectively than the beam without twisted phase under the same conditions. Our results will be useful in free space optical communication, lidar detection and imaging.

Propagation characteristics of partially coherent twisted Laguerre-Gaussian beam in atmospheric turbulence with anisotropy

Phase-locking of axisymmetrical-fold combination CO2 laser

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