Optics Letters

Femtosecond laser direct patterning of sensing materials toward flexible integration of micronanosensors

Li Guo, Hong Xia, Hui-Tao Fan, Yong-Lai Zhang, Qi-Dai Chen, Tong Zhang, Hong-Bo Sun
Reported is femtosecond laser direct patterning of sensing materials toward flexible integration of micronanosensors (FIMS), meaning the capability to fabricate multiple functional sensors of smaller size on a nonflat surface of a substrate that is not limited to silicon. As a representative ... [Opt. Lett. 35, 1695-1697 (2010)]

Fine control of terahertz radiation from filamentation by molecular lensing in air

M. Durand, Y. Liu, A. Houard, A. Mysyrowicz
We demonstrate a method to control remotely the terahertz (THz) source in air based on the bifilamentation of femtosecond laser pulses. By fine tuning the time delay between the two pulses, a significant modulation of the THz intensity from bifilamentation is observed. The phenomenon is attributed ... [Opt. Lett. 35, 1710-1712 (2010)]

1?W average-power 100?MHz repetition-rate 259?nm femtosecond deep ultraviolet pulse generation from ytterbium fiber amplifier

Xiangyu Zhou, Dai Yoshitomi, Yohei Kobayashi, Kenji Torizuka
We demonstrate 1W average-power ultraviolet (UV) femtosecond (fs) ultrashort pulse generation at a wavelength of 259 nm and a repetition rate as high as 100 MHz by quadrupling a fs ytterbium-fiber laser. A cavity-enhanced design is employed for efficient frequency doubling to the UV region. The ... [Opt. Lett. 35, 1713-1715 (2010)]

Enhanced radiation-loss-based radial-waveguide-coupled electrically pumped microresonator lasers with single-directional output

Fang Ou, Xiangyu Li, Boyang Liu, Yingyan Huang, Seng-Tiong Ho
A novel enhanced radiation-loss (ERL)-based radial waveguide coupling mechanism for microresonator lasers is experimentally demonstrated for the first time, to the best of our knowledge, resulting in single-directional output from the lasers. A 20 μm diameter InGaAsP/InP electrically pumped ... [Opt. Lett. 35, 1722-1724 (2010)]

Single-fiber grid for improved spatial resolution in distributed fiber optic sensor

C. Pandian, M. Kasinathan, S. Sosamma, C. Babu Rao, T. Jayakumar, N. Murali, Baldev Raj
The spatial resolution of an optical-fiber-based Raman distributed temperature sensor is limited by the pulse width of the laser used. We discuss a methodology of increasing spatial resolution by using a single-fiber grid. Spatial resolution improvement of up to 10 times is demonstrated. [Opt. Lett. 35, 1677-1679 (2010)]

Preparing large-aspect-ratio prolate metal nanoparticles in glass by simultaneous femtosecond multicolor irradiation

A. Stalmashonak, C. Matyssek, O. Kiriyenko, W. Hergert, H. Graener, G. Seifert
By irradiating spherical metal nanoparticles embedded in glass with several hundred ultrashort laser pulses at peak intensities of 0.2–1.5?TW∕cm^2, dichroic microstructures can be written in these nanocomposite materials. The underlying mechanism is transformation of the nanoparticles ... [Opt. Lett. 35, 1671-1673 (2010)]

Locking the carrier-envelope-offset frequency of an optical parametric oscillator without f–2f self-referencing

Teresa I. Ferreiro, Jinghua Sun, Derryck T. Reid
The carrier-envelope-offset (CEO) frequency of pulses from a femtosecond optical parametric oscillator (OPO) was stabilized for 30?min without the need for f–2f self-referencing in either the OPO or its pump laser. Interference between the high-frequency modes of the pump supercontinuum and ... [Opt. Lett. 35, 1668-1670 (2010)]

Polarization diffraction grating produced by femtosecond laser nanostructuring in glass

Martynas Beresna, Peter G. Kazansky
We demonstrate a polarization-sensitive diffractive optical element by femtosecond laser direct writing of light-induced self-assembled nano-gratings in bulk silica glass. Manipulation of the induced form birefringence is achieved by controlling the writing parameters, in particular, the ... [Opt. Lett. 35, 1662-1664 (2010)]

Millijoule-class Yb-doped pulsed fiber laser operating at 977?nm

Johan Boullet, Romain Dubrasquet, Capucine Médina, Ramatou Bello-Doua, Nicholas Traynor, Eric Cormier
We report what we believe to be the first millijoule-class ytterbium-doped fiber laser system operating on the zero-phonon line at 977?nm. An actively Q-switched master fiber oscillator delivers nanosecond pulses (FWHM 12–32?ns) at adjustable multiples of 10?kHz repetition rates that are ... [Opt. Lett. 35, 1650-1652 (2010)]

Enhancement of electric oxygen-iodine laser performance using larger mode volume resonators

Brian S. Woodard, Gabriel F. Benavides, Joseph W. Zimmerman, David L. Carroll, Andrew D. Palla, Michael T. Day, Joseph T. Verdeyen, Wayne C. Solomon
Herein the authors report on the demonstration of an 87% enhancement in cw laser power on the 1315 nm transition of atomic iodine via a 100% increase in the resonator mode volume. O_2(a^1Δ) is produced by a single rf-excited electric discharge sustained in an O_2–He–NO gas ... [Opt. Lett. 35, 1611-1613 (2010)]

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