We propose theoretically and demonstrate experimentally a method for generation of beams of light possessing
large angular momenta. The method utilizes cylindrical optical waveguides as well as whispering gallery mode
resonators that efficiently transform a plane electromagnetic wave into truncated Bessel beams. Generation of
the high order beams with well defined angular momenta is demonstrated.
By engineering the geometry of a nonlinear optical crystal, the effective efficiency of all nonlinear optical oscillations can be increased dramatically. Specifically, sphere and disk shaped crystal resonators have been used to demonstrate nonlinear optical oscillations at sub-miliwatt input power when cw light propagates in a Whispering Gallery Mode (WGM) of such a resonant cavity. In terms of both device production and experimentation in quantum optics, some nonlinear optical effects with naturally high efficiency can occult the desired nonlinear scattering process. The efficiency of second order nonlinear optical effects in ferroelectric crystals can be increased by engineering a poling structure to the crystal resonator. In this paper, I will discuss a new method for generating poling structures in ferroelectric crystal resonators called <i>calligraphic poling</i>. The details of the poling apparatus, experimental results, and speculation on future applications will be discussed.
We present a study of optical hyper-parametric oscillator based on
a nonlinear high-Q whispering gallery mode resonator and
demonstrate that the oscillator produces stable narrow band beat
note of the pump, signal, and idler waves making an all-optical
secondary frequency reference feasible. We discuss possibilities
of tuning of the oscillator.