G. Marowsky

Double-resonant second harmonic generation from surface coverages of nile-blue A

Second harmonic emission from a dye covered quartz surface has been observed in total internal reflection. Coverages with the dye nile-blue A yielded an increase in second harmonic output by several orders of magnitude as compared to coverages with rhodamine 6G. In the latter case only the harmonic light is at resonance with the S o-s 2 transition of the adsorbed dye molecules, whereas for nile-blue A both, the fundamental and the harmonic frequency, are at resonance with the respective singlet transitions.

Reliable Single‐Mode Operation of a Flashlamp Pumped Dye Laser

After efficient spectral narrowing with an interference filter and two succesive Fabry‐Perot etalons single‐mode operation of a flashlamp pumped dye laser has been achieved using a Michelson‐type mode selector as proposed by Fox and Smith. Typical output powers of 1 kW with a linewidth of 0.05 pm have been obtained.

Second-harmonic generation at interfaces

Abstract Second-harmonic light can be generated at dye coated surfaces of fused silica. By changing either the angle of incidence or the frequency of the fundamental, phase matching of signals produced at the two surfaces of a plane-parallel plate has been achieved. The interaction of light from multiple internal reflections has also been studied.

A tunable flashlamp-pumped dye ring laser of extremely narrow bandwidth

By insertion of two intracavity solid Fabry-Perot etalons into a traveling-wave dye ring laser an instrumental line width of 0.1 pm was attained in single-mode operation. Using different dye solutions, convenient tunability was possible within the wavelength range from 440 to 700 nm.

Interferometric Enhancement of Surface-Generated Second-Harmonic Radiation

Greatly improved second-harmonic emission has been obtained from dye monolayers adsorbed at quartz etalons. Two different types of interferometers have been studied in terms of the SH signal from dye coverage versus harmonic background emission. The phasematching-like conditions for constructive interferometric enhancement and the concomitant spatial and spectral emission characteristics are discussed in detail.

Dual-wavelength operation of two coupled dye lasers

Abstract The analysis of the influence of an intracavity absorbing dye cell on the spectral characteristics of a free running dye laser leads to the operation of two coupled dye lasers. A powerful flashlamp-pumped dye ring laser pumps a secondary intracavity dye laser with a conversion efficiency of 30 %. Both wavelengths are independently tunable and cover the spectral range from 580 nm to 652 nm in the case of the dye combination rhodamine 6G and cresyl violet.

Measurement of the third-order nonlinear susceptibility ratio by the CARS Maker fringe technique

Abstract Using the CARS Maker fringe technique, the nonresonant third-order nonlinear susceptibility was measured in several liquids.

Spectral narrowing in a dye laser with non-resonant feedback

The temporal development of the spectral output of a flashlamp pumped dye laser, having non-resonant feedback achieved by means of fibre optics, has been studied using a streak camera. Spectral narrowing from 40 nm (the bandwidth of the spontaneous fluorescence of the system) to 2.5 nm has been observed, with the degree of spectral narrowing depending upon the output power.

Second and first order phase transition analogy in the operation of an organic dye laser

Abstract By an extension of the Landau theory of phase transitions for the case of an organic dye laser, it is shown that the threshold behavior of such a laser may be interpreted as an example of a second or first order phase transition. The character of the phase transition primarily depends on the wavelength dependent internal reabsorption of the laser light, which can be controlled by simple wavelength tuning of the dye laser.

Laser-induced fluorescence studies of intact biological membranes

Abstract Using a pulsed, tunable dye laser details of the fluorescence behavior of single, intact human red blood cells have been studied. The high sensitivity of the laser excited fluorescence allows the detection of potential-dependent uptake and release of dye added to the suspension of living erythrocytes. The membrane potential of the erythrocytes was changed by means of different concentrations of valinomycin and potassium chloride in the suspension medium. Dye concentrations as low as 10 -8 M in water have been detected in a layer of 10 μm thickness and a cross sectional area of 1 μm 2 .