Feed items
Periodic and non-periodic frequency selection in an erbium doped fiber laser by silica microdisk optical cavity filters
Mon, 2010-08-02 02:00 — GuestSacha Bergeron, Samir Saïdi, Yves-Alain Peter
Integrated silica microdisk resonators can be used to create a variety of very high performance spectral filters. These filters can control the spectral emission of an erbium doped fiber laser. By modifying the number and sizes of the microdisks constituting these filters it is possible to produce ... [Opt. Express 18, 16797-16804 (2010)]
Diode-pumped gigahertz femtosecond Yb:KGW laser with a peak power of 3.9 kW
Mon, 2010-08-02 02:00 — GuestSelina Pekarek, Christian Fiebig, Max Christoph Stumpf, Andreas Ernst Heinz Oehler, Katrin Paschke, Götz Erbert, Thomas Südmeyer, Ursula Keller
We present a diode-pumped Yb:KGW laser with a repetition rate of 1 GHz and a pulse duration of 281 fs at a wavelength of 1041 nm. A high brightness distributed Bragg reflector tapered diode laser is used as a pump source. Stable soliton modelocking is achieved with a semiconductor saturable ... [Opt. Express 18, 16320-16326 (2010)]
High-aspect ratio nanochannel formation by single femtosecond laser pulses
Mon, 2010-08-02 02:00 — GuestJeffrey F. Herbstman, Alan J. Hunt
Single femtosecond pulsed laser damage can be confined radially to regions smaller than the focus spot size due to the highly nonlinear mechanisms for energy absorption and ablation in transparent dielectrics. Along the propagation axis, however, we show that channels can be machined much deeper ... [Opt. Express 18, 16840-16848 (2010)]
Geometry-dependent terahertz emission of silicon nanowires
Mon, 2010-08-02 02:00 — GuestGyeong Bok Jung, Yong Jae Cho, Yoon Myung, Han Sung Kim, Young Suk Seo, Jeunghee Park, Chul Kang
THz emission was observed from the vertically aligned silicon nanowire (Si NW) arrays, upon the excitation using a fs Ti-sapphire laser pulse (800 nm). The Si NWs (length = 0.3 ~9 μm) were synthesized by the chemical etching of n-type silicon substrates. The THz emission exhibits significant ... [Opt. Express 18, 16353-16359 (2010)]
Enhanced frequency up-conversion in Rb vapor
Mon, 2010-08-02 02:00 — GuestA. Vernier, S. Franke-Arnold, E. Riis, A. S. Arnold
We demonstrate highly efficient generation of coherent 420nm
light via up-conversion of near-infrared lasers in a hot rubidium vapor
cell. By optimizing pump polarizations and frequencies we achieve a
single-pass conversion efficiency of 260% per Watt, significantly higher
than in previous ... [Opt. Express 18, 17020-17026 (2010)]
Bandwidth enhancement of injection-locked distributed reflector lasers with wirelike active regions
Mon, 2010-08-02 02:00 — GuestSeungHun Lee, Devang Parekh, Takahiko Shindo, Weijian Yang, Peng Guo, Daisuke Takahashi, Nobuhiko Nishiyama, Connie J. Chang-Hasnain, Shigehisa Arai
The modulation bandwidth enhancement of distributed reflector (DR) lasers with wirelike active regions utilizing optical injection locking is demonstrated both theoretically and experimentally. By the rate equation analysis, it is shown that DR lasers with wirelike active regions realize a low ... [Opt. Express 18, 16370-16378 (2010)]
Application of cooled spatial light modulator for high power nanosecond laser micromachining
Mon, 2010-08-02 02:00 — GuestRainer J Beck, Jonathan P Parry, William N MacPherson, Andrew Waddie, Nick J Weston, Jonathan D Shephard, Duncan P Hand
The application of a commercially available spatial light modulator (SLM) to control the spatial intensity distribution of a nanosecond pulsed laser for micromachining is described for the first time. Heat sinking is introduced to increase the average power handling capabilities of the SLM beyond ... [Opt. Express 18, 17059-17065 (2010)]
Numerical implementation of a VCSEL-based stochastic logic gate via polarization bistability
Mon, 2010-08-02 02:00 — GuestJordi Zamora-Munt, C. Masoller
We study the interplay of polarization bistability, spontaneous emission noise and aperiodic current modulation in vertical cavity surface emitting lasers (VCSELs). We demonstrate the phenomenon of logic stochastic resonance (LSR), by which the laser gives robust and reliable logic response to two ... [Opt. Express 18, 16418-16429 (2010)]
Composite Yb:YAG/SiC-prism thin disk laser
Mon, 2010-08-02 02:00 — GuestG. A. Newburgh, A. Michael, M. Dubinskii
We report the first demonstration of a Yb:YAG thin disk laser wherein the gain medium is intracavity face-cooled through bonding to an optical quality SiC prism. Due to the particular design of the composite bonded Yb:YAG/SiC-prism gain element, the laser beam impinges on all refractive index ... [Opt. Express 18, 17066-17074 (2010)]
Emission properties of electrically pumped triangular shaped microlasers
Mon, 2010-08-02 02:00 — GuestMartina Hentschel, Qi Jie Wang, Changling Yan, Federico Capasso, Tadataka Edamura, Hirofumi Kan
We study the emission properties of electrically pumped triangular-shaped microlasers with rounded corners. We find no signs of directional emission for the relatively large cavities (dimension ∼ 100μm) used in our experiments, in full agreement with ray simulation results. The broad ... [Opt. Express 18, 16437-16442 (2010)]
