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Rapid passage signals induced by chirped quantum cascade laser radiation: K state dependent-delay effects in the ν_2 band of NH_3
Sun, 2010-08-15 02:00 — GuestJ. H. Northern, G. A. D. Ritchie, E. P. Smakman, J. H. van Helden, J. Cockburn, G. Duxbury
In this Letter, a 10μm quantum cascade laser operating in the intrapulse mode is used observe rapid passage (RP) effects within a 40cm single-pass gas cell containing low pressures of NH_3. The laser tuning range allows the rotational states J=2 with K=0, 1, and 2 to be probed. We show that ... [Opt. Lett. 35, 2750-2752 (2010)]
Dissipative soliton generation in Yb-fiber laser with an invisible intracavity bandpass filter
Sun, 2010-08-15 02:00 — GuestLuming Zhao, Dingyuan Tang, Xuan Wu, Han Zhang
We report on dissipative soliton (DS) generation in an Yb-doped (YDF) fiber laser passively mode locked with the nonlinear polarization rotation (NPR) technique. We found that even without the insertion of a physical bandpass filter in the cavity, not only could DSs be automatically formed in the ... [Opt. Lett. 35, 2756-2758 (2010)]
Quantum-cascade laser integrated with a metal–dielectric–metal-based plasmonic antenna
Sun, 2010-08-15 02:00 — GuestDibyendu Dey, John Kohoutek, Ryan M. Gelfand, Alireza Bonakdar, Hooman Mohseni
Optical nanoantennas are capable of enhancing the near-field intensity and confining optical energy within a small spot size. We report a novel metal–dielectric–metal coupled-nanorods antenna integrated on the facet of a quantum-cascade laser. Finite-difference time-domain simulations ... [Opt. Lett. 35, 2783-2785 (2010)]
Spatiotemporal evolution of femtosecond laser pulses guided in air-clad fused-silica nanoweb
Sun, 2010-08-15 02:00 — GuestC. Kreuzer, A. Podlipensky, P. St.J. Russell
We investigate nonlinear propagation and self-focusing of femtosecond Ti:sapphire laser pulses in an 800-nm-thick silica nanoweb fiber. Different dispersion regimes are accessible by launching TE- or TM-polarized light. Excitation in the anomalous dispersion regime (TM) results in pulse splitting ... [Opt. Lett. 35, 2816-2818 (2010)]
On the theory of the modulation instability in optical fiber amplifiers
Sun, 2010-08-15 02:00 — GuestSergei K. Turitsyn, Alexander M. Rubenchik, Michail P. Fedoruk
The modulation instability (MI) in optical fiber amplifiers and lasers with anomalous dispersion leads to cw radiation breakup. This can be both a detrimental effect limiting the performance of amplifiers and an underlying physical mechanism in the operation of MI-based devices. Here we revisit the ... [Opt. Lett. 35, 2684-2686 (2010)]
Arbitrary-order nonlinear contribution to self-steepening
Sun, 2010-08-15 02:00 — GuestJérôme Kasparian, Pierre Béjot, Jean-Pierre Wolf
On the basis of the recently published generalized Miller formulas, we derive the spectral dependence of the contribution of arbitrary-order nonlinear indices to the group-velocity index. We show that in the context of laser filamentation in gases, all experimentally accessible orders (up to the ... [Opt. Lett. 35, 2795-2797 (2010)]
Pulsed orange generation optimized in a diode-pumped Nd:YVO_4 laser using monolithic dual PPLN electro-optic Q switches
Sun, 2010-08-15 02:00 — GuestW. K. Chang, Y. H. Chen, J. W. Chang
We report a pulsed intracavity sum-frequency generator in a diode-pumped, dual-wavelength Nd:YVO_4 laser whose operation was optimized with two electro-optic Q switches built in a monolithic periodically poled lithium niobate (PPLN) crystal. The dual PPLN Q switches, though integrated, are able to ... [Opt. Lett. 35, 2687-2689 (2010)]
Spatially mapping random lasing cavities
Sun, 2010-08-15 02:00 — GuestR. C. Polson, Z. V. Vardeny
A mapping technique is developed to spatially resolve random laser-emission spectra from disordered solid media with an optical gain above the threshold excitation intensity for lasing; the technique is applied to π-conjugated polymer 1ms. By mapping the spatial extent of emission peaks in ... [Opt. Lett. 35, 2801-2803 (2010)]
Mode locking of a Cr:YAG laser with carbon nanotubes
Sun, 2010-08-15 02:00 — GuestWon Bae Cho, Andreas Schmidt, Sun Young Choi, Valentin Petrov, Uwe Griebner, Günter Steinmeyer, Soonil Lee, Dong-Il Yeom, Fabian Rotermund
We report on mode locking of a bulk Cr:YAG laser by using a transmission-type single-walled carbon nanotube saturable absorber. Stable and self-starting laser operation in the picosecond and femtosecond regimes is obtained at wavelengths around 1.5μm. Tunable transform-limited sub-100fs ... [Opt. Lett. 35, 2669-2671 (2010)]
Whispering-gallery-mode-resonator-based ultranarrow linewidth external-cavity semiconductor laser
Sun, 2010-08-15 02:00 — GuestW. Liang, V. S. Ilchenko, A. A. Savchenkov, A. B. Matsko, D. Seidel, L. Maleki
We demonstrate a miniature self-injection locked distributed-feedback laser using resonant optical feedback from a high-Q crystalline whispering-gallery-mode resonator. The linewidth reduction factor is greater than 10,000, with resultant instantaneous linewidth of less than 200Hz. The minimal ... [Opt. Lett. 35, 2822-2824 (2010)]
