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Influence of dispersion of fiber Bragg grating mirrors on formation of optical power spectrum in Raman fiber lasers
Sun, 2010-08-01 02:00 — GuestNicolas Dalloz, Stéphane Randoux, Pierre Suret
We show, from experiments and numerical simulations, that dispersion of fiber Bragg grating (FBG) mirrors influences the formation of the optical power spectrum of Raman fiber lasers by shifting the cavity zero-dispersion wavelength inside the FBG reflectivity bandwidth. This results in a spectrum ... [Opt. Lett. 35, 2505-2507 (2010)]
Simultaneous Raman and elastic light scattering imaging for particle formation investigation
Sun, 2010-08-01 02:00 — GuestAndreas Braeuer, Stefan Dowy, Alfred Leipertz
We used two-dimensional laser Raman scattering and elastic light scattering to analyze mixture driven particle formation in the supercritical antisolvent process. Using only one excitation laser, the partial density of the antisolvent CO_2, the composition of the solvent/antisolvent mixture, and ... [Opt. Lett. 35, 2553-2555 (2010)]
Pr:YAlO_3 microchip laser
Sun, 2010-08-01 02:00 — GuestMartin Fibrich, Helena Jelínková, Jan Šulc, Karel Nejezchleb, Václav Škoda
A cw Pr:YAlO_3 microchip-laser operation in the near-IR spectral region is reported. A microchip resonator was formed by dielectric mirrors directly deposited on the Pr:YAlO_3 crystal surfaces. For active medium pumping, a GaN laser diode providing up to 1W of output power at ~448 nm was used. ... [Opt. Lett. 35, 2556-2557 (2010)]
Design of low-threshold compact Au-nanoparticle lasers
Sun, 2010-08-01 02:00 — GuestX. F. Li, S. F. Yu
We performed a rigorous study to reduce threshold gain of Au-nanoparticle lasers in the deep-subwavelength scale with the consideration of strong interband transitions in Au and device dimensions. We found that the high-threshold optical gain of the nanolaser (over 10^5cm^−1, which is ... [Opt. Lett. 35, 2535-2537 (2010)]
Predicting laser-induced bulk damage and conditioning for deuterated potassium dihydrogen phosphate crystals using an absorption distribution model
Sun, 2010-08-01 02:00 — GuestZhi M. Liao, M. L. Spaeth, K. Manes, J. J. Adams, C. W. Carr
We present an empirical model that describes the experimentally observed laser-induced bulk damage and conditioning behavior in deuterated potassium dihydrogen phosphate (DKDP) crystals. The model expands on an existing nanoabsorber precursor model and the multistep absorption mechanism to include ... [Opt. Lett. 35, 2538-2540 (2010)]
Unidirectional ring-laser operation using sum-frequency mixing
Sun, 2010-08-01 02:00 — GuestPeter Tidemand-Lichtenberg, Haynes Pak Hay Cheng, Christian Pedersen
A technique enforcing unidirectional operation of ring lasers is proposed and demonstrated. The approach relies on sum-frequency mixing between a single-pass laser and one of the two counterpropagating intracavity fields of the ring laser. Sum-frequency mixing introduces a parametric loss for the ... [Opt. Lett. 35, 2567-2569 (2010)]
High-energy, in-band pumped Q-switched Ho^3+:LuLiF_42?μm laser
Sun, 2010-08-01 02:00 — GuestMartin Schellhorn
A Q-switched Tm:fiber-laser-pumped Ho:LuLiF_4 laser is reported that has been optimized for high-energy pulses at low repetition rates. Operating at 100Hz, a pulse energy of 24.8mJ with pulse widths of 47ns at a wavelength of 2052nm was achieved. The beam propagation factor (M^2) was measured to be ... [Opt. Lett. 35, 2609-2611 (2010)]
Random laser spectroscopy for nanoscale perturbation sensing
Sun, 2010-08-01 02:00 — GuestQinghai Song, Shumin Xiao, Zhengbin Xu, Vladimir M. Shalaev, Young L. Kim
We report a spectroscopic method using coherent random lasers for a simple, yet nanoscale, sensing approach. Unique spectral properties of coherent random laser emission can be detectably altered when introducing nanoscale perturbations to a simple nanocomposite film that consists of dielectric ... [Opt. Lett. 35, 2624-2626 (2010)]
Parallel detection of amplitude-modulated, ultrasound-modulated optical signals
Sun, 2010-08-01 02:00 — GuestRui Li, Lipei Song, Daniel S. Elson, Meng-Xing Tang
We investigated the effect of amplitude-modulated (AM) ultrasound (US) on acousto-optic (AO) signals. A phantom was exposed to both AM US and a green laser, and CCD measurements of speckle contrast were made with various exposure times. The results show that the AO signal oscillates at the AM ... [Opt. Lett. 35, 2633-2635 (2010)]
Bidirectional mode-locked fiber ring laser using self-regenerative, passively controlled, threshold gating
Sun, 2010-08-01 02:00 — GuestAlexandre Braga, Jean-Claude Diels, Ravinder Jain, Ronald Kay, Li Wang
We demonstrate a technique to achieve bidirectional mode locking of a fiber ring laser using two amplitude modulators passively driven by a signal regenerated from the oscillation of the laser itself. The new scheme allows generation of two independent—frequency ... [Opt. Lett. 35, 2648-2650 (2010)]
