Experimental investigation and numerical simulation of the influence of the strain rate in laser forming are presented. To isolate and effectively study the strain rate effects, which are temperature dependent, a ‘‘constant peak temperature’’ method is developed with the aid of numerical modeling and solution. Under the condition of the constant peak temperature, the effects of strain rate on f...

In order to study the spallation phenomenon of titanium alloy under shock nanosecond laser, Neodymium-Yttrium-Aluminum Garnet laser was used carry out experiments on surface alloy. By observing and measuring morphology target material, forming factors changes different parameter settings, criteria were obtained. The results show that single variable method, change energy can affect shape variab...

Huge spectral coverage of random lasing throughout the visible up to the infrared range is achieved with star-shaped gold nanoparticles ("nanostars"). As intrinsically broadband scattering centers, the nanostars are suspended in solutions of various laser dyes, forming randomly arranged resonators which support coherent laser modes. The narrow emission line widths of 0.13 nm or below suggest th...

Concerns about the health effects of nitrogen dioxide (NO2) and its role in forming deleterious atmospheric species have made it desirable to have low-cost, sensitive ambient measurements of NO2. We have developed a continuous-wave laser-diode laser-induced fluorescence (LIF) system for NO2 that operates at ambient pressure, thereby eliminating the need for an expensive pumping system. The curr...