Biomedical subjects

Robert W Eason

Publications and source records attributed to Robert W Eason.

3 recordsLinked to original sources

PubMed2004

Domain-engineered lithium niobate as a medium for an integrated solid-state two-dimensional color laser scanning system.

A recently proposed alternative to conventional prism-type electro-optic solid-state deflectors is the single interface deflector. Whereas these deflectors are comparable in performance to prism-type deflectors, they are far simpler in construction. This simplicity obviously has the advantages that it reduces fabrication time and cost and allows for easier optimization. Less obviously, but more advantageously, the simplified geometry provides, for the first time to our knowledge, the ability to achieve a completely solid-state two-dimensional beam deflector. We also detail how the two-dimensional deflector can be further augmented by the addition of intensity and color switching to the device.

Journal Article↗

PubMed2004

Resolution considerations in electro-optic, single interface deflectors.

We discuss the maximum theoretical resolution of a single interface, electro-optically controllable beam deflector in domain-engineered LiNbO3 and report on experimental results for implementation of devices optimized either for maximum resolution or for maximum deflection angle. For the resolution optimized device we observed approximately 50 resolvable spots for a +/- 1250-V range, which to our knowledge is a report of one of the highest ratios of resolution per volt from a solid-state electro-optic beam deflector.

Journal Article↗

PubMed2002

Efficient operation of a solid-state adaptive laser oscillator.

We present the results of a cw diode-pumped Nd:YVO4 laser oscillator based on a self-starting adaptive gain-grating resonator. Adaptive laser operation has been demonstrated with 12-W output for 37 W of diode pumping, producing a TEM00 mode that compensates for thermal aberrations. The issue of the finite aperture of the amplifier is discussed, and a design that incorporates an intracavity lens is used to improve the collection efficiency with severe thermal lensing at high pump powers. The powers of the beams involved in the resonator are compared with theory and are found to be in good agreement. Spectral and temporal behavior of the adaptive laser is investigated, and very interesting behavior is shown, including self-induced temporal modulation dynamics and a switching between a narrowband and a broad bandwidth of operation.

Journal Article↗