Two-photon microscopy has advanced fluorescence imaging of cellular processes in living animals. Fluorescent proteins in the blue-green wavelength range are widely used in two-photon microscopy; however, the use of red fluorescent proteins is limited by the low power output of Ti-Sapphire lasers above 1,000 nm. To overcome this limitation we have developed two red fluorescent proteins, LSS-mKat...

Liquid crystal lasers are typically pumped with Q-switched lasers, which provide the short pulse durations necessary to produce band-edge liquid laser emission. However, current cost and bulk of pump laser, relative component, limit application potential technology. A low-cost compact alternative source has often been discussed within community but not yet demonstrated. In this paper, a 445 nm ...

High-resolution nonlinear laser spectroscopy based on absorption saturation, Lamb-dip and spectral hole-burning phenomena have contributed much to basic and applied photonics. Here, a laser spectroscopy based on nonlinear photothermal and photoacoustic phenomena is presented. It shows ultrasharp resonances and dips up to a few nanometres wide in broad plasmonic spectra of nanoparticles. It also...

We present a time dependent theory of laser catalysis, a process in which a strong light source is used to aaect tunneling through a potential barrier by inducing a transient electronic excitation to a bound state. We have performed detailed calculations of pulsed laser catalysis on a one-dimensional Eckart potential as a function of the collision energy and the laser's central-frequency. As in...