MEASUREMENT OF NANOSTRUCTURES WITH MICROMACHINED MICROSCOPES

We have made reproducible scanning probes with high efficiency, and predictable and reproducible character-istics. We obtained good efficiency with dimensions well below the diffraction limit, so that rela-tively small laser powers in the milliwatt range can be used. For single frequency operation, only low power is necessary to obtain very high fields for the excitation of well-defined Raman scattering, and to work in a reflection mode with good scanning speeds; obtained predictable results with very high fields suitable for obtaining Raman scattering and two-photon scattering; made a scanning probe mounted on a micromachined cantilever to obtain high definition reflection mode images that can be scanned rapidly;and observed Raman scattering using bowtie antennas with CW excitation

Acoustic modulators for optical fibres

We have examined techniques for acoustic modulation of an optical fibre. A simple coupled mode theory has been developed which shows that by use of an acoustic wave propagating in the direction of the fibre, it is possible to make a single-sideband modulator. Experimental results confirming these ideas are given, along with some ideas for future direction of this work

Acoustic modulators for optical fibres

We have examined techniques for acoustic modulation of an optical fibre. A simple coupled mode theory has been developed which shows that by use of an acoustic wave propagating in the direction of the fibre, it is possible to make a single-sideband modulator. Experimental results confirming these ideas are given, along with some ideas for future direction of this work.Nous avons examiné des techniques destinées à la modulation acoustique dans une fibre optique. Une théorie simple de modes couplés a été développée; elle montre qu'en utilisant une onde acoustique se propageant dans la direction de la fibre, il est possible de réaliser un modulateur à bande latérale unique. Des résultats expérimentaux confirmant ces idées sont présentés ainsi que quelques idées sur les directions futures de ce travail

Frequency modulated mode-locked fiber laser with an integrated fiber phase modulator

A Nd3+-doped fiber laser has been FM modelocked by two means: 20-ps pulses were obtained with a bulk phase modulator. Detuning the modulation frequency induced FM operation which broadened the laser bandwidth to 57 GHz. An integrated fiber phase modulator produced 80-ps pulses. Low intracavity losses led to submilliwatt thresholds and slope efficiencies in excess of 45%

Mode-locked fiber laser with a fiber phase modulator

FM mode-locked operation of a single-mode Nd3+-doped fiber laser has been achieved with an integrated fiber phase modulator. The technique permits a low-loss cavity configuration, resulting in low threshold and high slope efficiency. Pulses of ~200psec duration are observed at a repetition rate of 417 MHz with an average output power of 15 mW

Thermally poled germanosilicate films with high second-order nonlinearity

Accurate measurements of the second-order nonlinearity profile of thermally poled low-loss germanosilicate films grown on fused-silica substrates are reported, of interest as potential electro-optic devices. After optimization, we demonstrate a record high nonlinear coefficient d 33 ≈ 1.6 pm/V, a two-fold improvement over highest reported d 33 value in fused silica that we attribute to the presence of germanium. © 2005 Optical Society of America