Hans Joachim Eichler

TL;DR: Degenerate four-wave mixing (DFWM) as mentioned in this paper is a simple method to achieve phase conjugation, i.e. to generate a wave which propagates time reversed with respect to an incident wave.

TL;DR: In this paper, a room temperature multiple Stokes and anti-Stokes picosecond generation in tetragonal YVO4 and GdVO4 host crystals for lasing trivalent lanthanides (Ln3+) has been observed for the first time.

TL;DR: All the tungstates are classified as promising media for lasers and neodymium-doped crystals for self-stimulated Raman scattering lasers.

TL;DR: In this article, a linear and ring Raman oscillator based on PbWO 4 was demonstrated in lead tungstate in the nanosecond regime, where the resonators were pumped by the fundamental and second harmonic wavelengths, respectively, of a Q-switched Nd 3+ :Y 3 Al 5 O 12 laser.

TL;DR: In this paper, a simple feedback mirror experiment using a hybridly aligned nematic liquid crystal 5CB as a nonlinear optical medium is described, and the wave numbers of the patterns and threshold intensities are investigated as a function of the distance between the nonlinear film and the mirror.