We investigated the role of excitation laser wavelength on plasma generation and the expansion and confinement of ablation plumes at early times (0–500 ns) in the presence of atmospheric pressure. Fundamental, second, and fourth harmonic radiation from Nd:YAG laser was focused on Al target to produce plasma. Shadowgraphy, fast photography, and optical emission spectroscopy were employed to anal...

Multiphoton excitation microscopy is becoming increasingly important as it offers several advantages over confocal laser (single photon excitation) scanning microscopy (CLSM) such as use of lesser damaging NIR wavelengths, reduced scattering, deeper imaging, no need for pinhole, higher light collection efficiency and excitation of UV dyes at NIR wavelengths; in addition, excitation and photoble...

Differing caging mechanisms of electronically excited ICl within He...ICl complexes are investigated using laser-induced fluorescence and two-laser, pump-probe spectroscopy. A continuum signal is observed in laser-induced fluorescence spectra recorded with excitation energies that access regions above the I 2P3/2 + Cl 2P3/2 dissociation limit. We show that this signal is associated with transit...

Two-photon excitation fluorescence microscopy allows in vivo high-resolution imaging of human skin structure and biochemistry with a penetration depth over 100 microm. The major damage mechanism during two-photon skin imaging is associated with the formation of cavitation at the epidermal-dermal junction, which results in thermal mechanical damage of the tissue. In this report, we verify that t...