Virtual Journal of Laser is a web tool to help laser researchers follow new publications from major academic journals, discover and promote interesting works by voting, commenting and simply visiting. Subscribe Virtual Journal of Laser to take the advantage! Read more...
If you find VJLaser helpful, please consider donation for covering the host costage. Many thanks!
Cavity-QED treatment of scattering-induced free-space excitation and collection in high-Q whispering-gallery microcavities
Fri, 2012-01-27 17:00 — GuestAuthor(s): Yong-Chun Liu, Yun-Feng Xiao, Xue-Feng Jiang, Bei-Bei Li, Yan Li, and Qihuang Gong
Whispering-gallery microcavity lasers possess ultralow thresholds, whereas convenient free-space optical excitation and collection suffer from low efficiencies due to their rotational symmetries. Here we analytically study a three-dimensional microsphere coupled to a nanosized scatterer in the frame...
[Phys. Rev. A 85, 013843] Published Fri Jan 27, 2012
Wideband optical comb generation using an injection-locked feedback loop
Wed, 2011-06-15 22:08 — GuestPublication year: 2011
Source: Optics Communications, In Press, Uncorrected Proof, Available online 14 June 2011
Taraprasad, Chattopadhyay , Anuj Kumar, Saw
This paper presents a novel circuit for wideband optical comb generation which will be useful in DWDM applications. The injection-locked feedback loop broadens the bandwidth of the optical comb. The injection-locked laser diodes perform amplification, bandpass filtering as well as laser RIN suppression. Several hundred GHz bandwidth optical comb can be generated by this circuit within a reasonable power envelope.
Signatures of single-site addressability in resonance fluorescence spectra
Fri, 2012-01-27 17:00 — GuestAuthor(s): Peter Degenfeld-Schonburg, Elena del Valle, and Michael J. Hartmann
Pioneering methods in recent optical-lattice experiments allow focusing laser beams down to a spot size that is comparable to the lattice constant. Inspired by this achievement, we examine the resonance fluorescence spectra of two-level atoms positioned in adjacent lattice sites and compare the case...
[Phys. Rev. A 85, 013842] Published Fri Jan 27, 2012
An amplified femtosecond laser system for material micro-/nanostructuring with an integrated Raman microscope
Fri, 2010-05-28 01:00 — GuestOthman H. Y. Zalloum, Matthew Parrish, Alexander Terekhov, and William Hofmeister
In order to obtain new insights into laser-induced chemical material modifications, we introduce a novel combined approach of femtosecond pulsed laser-direct writing and in situ Raman microscopy within a single experimental apparatus. A newly developed scanning microscope, the first of its kind, pro ... [Rev. Sci. Instrum. 81, 053906 (2010)] published Thu May 27, 2010.
Nonadiabatic atomic ionization by intense subcycle laser pulses
Fri, 2012-01-27 17:00 — GuestAuthor(s): Jian Zheng, Enming Qiu, Yingchun Yang, and Qiang Lin
The atomic photoionization by a subcycle linearly polarized laser pulse is studied with numerical solutions of the time-dependent Schrödinger equation for a hydrogenlike atom. In this regime, the presumption for the adiabatic ionization theories that atoms are ionized directly from an initial bound ...
[Phys. Rev. A 85, 013417] Published Fri Jan 27, 2012
Prevention of recurrent herpes labialis outbreaks through low-intensity laser therapy: a clinical protocol with 3-year follow-up
Tue, 2011-11-15 18:48 — GuestPrevention of recurrent herpes labialis outbreaks through low-intensity laser therapy: a clinical protocol with 3-year follow-up
Strong-field adiabatic passage in the continuum: Electromagnetically induced transparency and stimulated Raman adiabatic passage
Fri, 2012-01-27 17:00 — GuestAuthor(s): A. Eilam and M. Shapiro
We present a fully quantum-mechanical theory of the mutual light-matter effects when two laser pulses interact with three discrete states coupled to a (quasi)continuum. Our formulation uses a single set of equations to describe the time dependence of the discrete and continuum populations, as well a...
[Phys. Rev. A 85, 012520] Published Fri Jan 27, 2012
Super-resolution at the shot-noise limit with coherent states and photon-number-resolving detectors
Fri, 2010-05-14 07:00 — GuestYang Gao, Petr M. Anisimov, Christoph F. Wildfeuer, Jerome Luine, Hwang Lee, Jonathan P. Dowling
There has been much recent interest in quantum optical interferometry for applications to metrology, subwavelength imaging, and remote sensing such as in quantum laser radar (LADAR). For quantum LADAR, atmospheric absorption rapidly degrades any quantum state of light, so that for high-photon loss ... [J. Opt. Soc. Am. B 27, A170-A174 (2010)]
Estimation of inner surface profile of a tube by two-wavelength phase-shifting digital holography
Fri, 2010-06-04 18:48 — Guest
contouring, a two-wavelength method using injection-current-induced wavelength changes of a laser diode is used. To obtain
inner surface information on a tube, a cone-shaped mirror is set inside the tube. Speckle noise occurring in the reconstructed
phase difference image is effectively suppressed by an adaptive filtering technique consisting of exponential averaging and
masking filtering processes. Distribution of optical path length in the experimental alignment is calculated and well explains
the experimental results. It is shown that the calculation of optical path length by a simple model can remove the distortion
of profiles occurring in the experimental results and enable the estimation of the inner surface profile of an aluminum tube.
On the efficiency of a multiterawatt optical parametric amplifier: numerical model and optimization
Sat, 2011-10-01 02:00 — GuestYuriy Stepanenko
Numerical simulations and analysis of a very efficient and stable noncollinear optical parametric chirped pulse amplification (OPCPA) femtosecond system are presented. The system is optimized for a long (nanosecond), rectangular temporal profile and a flat-top spatial profile of the pump laser ... [J. Opt. Soc. Am. B 28, 2337-2346 (2011)]
Intraoral laser welding: ultrastructural and mechanical analysis to compare laboratory laser and dental laser
Sun, 2010-05-02 07:53 — Guest
clinical cases, we have suggested that the Nd:YAG laser device commonly utilized in the dental office could be used to repair
broken fixed, removable and orthodontic prostheses and to weld metals directly in the mouth. The aim of this work was to evaluate,
using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and dynamic mechanical analysis (DMA),
the quality of the weld and its mechanical strength, comparing a device normally used in dental laboratory and a device normally
used in the dental office for oral surgery, the same as that described for intraoral welding.
Dual-wavelength laser source for onboard atom interferometry
Tue, 2011-11-01 02:00 — GuestV. Ménoret, R. Geiger, G. Stern, N. Zahzam, B. Battelier, A. Bresson, A. Landragin, P. Bouyer
We present a compact and stable dual-wavelength laser source for onboard atom interferometry with two different atomic species. It is based on frequency-doubled telecom lasers locked on a femtosecond optical frequency comb. We take advantage of the maturity of fiber telecom technology to reduce the ... [Opt. Lett. 36, 4128-4130 (2011)]
- Add new comment
- Feed: Optics Letters
- Original article
- 1457 reads
High slope efficiency liquid crystal lasers
Wed, 2010-12-22 02:00 — GuestCarrie Mowatt, Stephen M. Morris, Timothy D. Wilkinson, and Harry J. Coles
In this letter, we demonstrate high slope efficiency laser emission from reflective liquid crystal laser devices with a silicon backplane. Three different cell architectures were fabricated and each resulting laser device was then characterized in terms of the excitation threshold and the slope effi ... [Appl. Phys. Lett. 97, 251109 (2010)] published Tue Dec 21, 2010.
Spatiotemporal amplitude-and-phase reconstruction by Fourier-transform of interference spectra of high-complex-beams
Tue, 2010-04-20 07:00 — GuestBenjamín Alonso, Íñigo J. Sola, Óscar Varela, Juan Hernández-Toro, Cruz Méndez, Julio San Román, Amelle Zaïr, Luis Roso
We propose what we believe to be a novel method to reconstruct the spatiotemporal amplitude and phase of the electric field of ultrashort laser pulses using spatially resolved spectral interferometry. This method is based on a fiber-optic coupler interferometer that has certain advantages in ... [J. Opt. Soc. Am. B 27, 933-940 (2010)]
Performance comparison of centroiding algorithms for laser guide star wavefront sensing with extremely large telescopes
Mon, 2010-11-01 02:00 — GuestOlivier Lardière, Rodolphe Conan, Richard Clare, Colin Bradley, Norbert Hubin
Sodium laser guide stars (LGSs) increase the sky coverage of adaptive optics systems but have their own limitations. For Shack–Hartmann wavefront sensors (WFSs), the slow variations of the sodium layer altitude and atom density profile induce changing errors on centroid measurements, ... [Appl. Opt. 49, G78-G94 (2010)]
14 GHz visible supercontinuum generation: calibration sources for astronomical spectrographs
Mon, 2011-08-15 02:00 — GuestS. P. Stark, T. Steinmetz, R. A. Probst, H. Hundertmark, T. Wilken, T. W. Hänsch, Th. Udem, P. St. J. Russell, R. Holzwarth
We report the use of a specially designed tapered photonic crystal fiber to produce a broadband optical spectrum covering the visible spectral range. The pump source is a frequency doubled Yb fiber laser operating at a repetition rate of 14 GHz and emitting sub-5 pJ pulses. We experimentally ... [Opt. Express 19, 15690-15695 (2011)]
503MHz repetition rate femtosecond Yb:fiber ring laser with an integrated WDM collimator
Mon, 2011-12-05 02:00 — GuestAimin Wang, Hongyu Yang, Zhigang Zhang
We demonstrate 503MHz fundamental high repetition rate operation in a ring cavity passively mode-locked Yb:fiber laser incorporating a novel wavelength–division-multiplexing collimator and a piece of all-solid photonic bandgap fiber. The Yb doped fiber was directly fabricated as one fiber ... [Opt. Express 19, 25412-25417 (2011)]
Ultrashort pulse generation from diode pumped mode-locked Yb^3+:sesquioxide single crystal lasers
Mon, 2011-02-14 02:00 — GuestM. Tokurakawa, A. Shirakawa, K. Ueda, R. Peters, S. T. Fredrich-Thornton, K. Petermann, G. Huber
We present diode pumped SESAM supported Kerr-lens mode locked laser operation based on Yb^3+:Sc_2O_3 and Yb^3+:Lu_2O_3 single crystals. Pulses as short as 71 fs with an average power of 1.09 W were obtained from an Yb^3+:Lu_2O_3 single crystal. Yb^3+:Sc_2O_3 delivered pulses as short as 81 fs with ... [Opt. Express 19, 2904-2909 (2011)]
Fifty percent internal slope efficiency femtosecond direct-written Tm^3+:ZBLAN waveguide laser
Sun, 2011-05-01 02:00 — GuestD. G. Lancaster, S. Gross, H. Ebendorff-Heidepriem, K. Kuan, T. M. Monro, M. Ams, A. Fuerbach, M. J. Withford
We report a 790?nm pumped, Tm^3+ doped ZBLAN glass buried waveguide laser that produces 47?mW at 1880?nm, with a 50% internal slope efficiency and an M^2 of 1.7. The waveguide cladding is defined by two overlapping rings created by femtosecond direct-writing of the glass, which results in the ... [Opt. Lett. 36, 1587-1589 (2011)]
Stability analysis of pulsed cascaded Raman lasers in dispersion-managed systems
Tue, 2011-11-01 02:00 — GuestSalih K. Kalyoncu, Shiming Gao, En-Kuang Tien, Yuewang Huang, Dogukan Yildirim, Enver Adas, Stefan Wabnitz, Ozdal Boyraz
We investigate synchronous first and second order pulsed Raman lasers that can achieve frequency spacing of up to 1000?cm^−1 for CARS microscopy applications. In particular, we focus on analytical and numerical analysis of pulsed stability derived for Raman lasers by using dispersion-managed ... [J. Opt. Soc. Am. B 28, 2812-2819 (2011)]
