Virtual Journal of Laser

Antonio Agnesi, Alessandro Greborio, Federico Pirzio, Elena Ugolotti, Giancarlo Reali, Annalisa Guandalini, Juerg Aus der Au
In this paper, we present a simple, compact, and efficient Yb:CALGO laser system that can produce sub-100 fs pulses easily tunable over a 38 nm wide wavelength range between 1034 and 1072 nm. The laser is passively mode locked with a semiconductor saturable absorber and generates up ... [J. Opt. Soc. Am. B 30, 1513-1516 (2013)]

Jennifer L. Gottfried
Laser-induced breakdown spectroscopy is a promising approach for explosive residue detection, but several limitations to its widespread use remain. One issue is that the emission spectra of the residues are dependent on the substrate composition because some of the substrate is usually entrained in ... [Appl. Opt. 52, B10-B19 (2013)]

Nature Photonics 6, 795 (2012).
doi:10.1038/nphoton.2012.310

Fifty years ago, researchers at a handful of laboratories around the world were reporting lasing from the first semiconductor lasers. Our IT infrastructure today relies on their diligence and success.

A full multicore fiber optic link is demonstrated, transmitting greater than 100 Gb/s through a single strand of multimode fiber for the first time. The fiber, which consists of seven graded-index multimode cores, is used to transmit up to 120 Gb/s over 100 m using a custom multicore-fiber interfacing transmitter and receiver. 2-D arrays of vertical-cavity surface-emitting lasers (VCSELs) and vertically illuminated photodiodes (PDs) are fabricated with a geometry corresponding to the outer six cores of the seven-core fiber, which is arranged in a hexagonal pattern. Both flip-chip and wire-bonding technologies are used to package the VCSEL and PD chips with multichannel transmitter and receiver integrated circuits. Amplitude and timing margins of the end-to-end signals are analyzed through bit-error-rate (BER) measurements. The effects of electrical and optical crosstalk are shown to result in negligible degradation to the BER performance.

Igor Alexeenko, Jean-François Vandenrijt, Giancarlo Pedrini, Cédric Thizy, Birgit Vollheim, Wolfgang Osten, Marc P. Georges
We describe three different interferometric techniques (electronic speckle pattern interferometry, digital holographic interferometry, and digital shearography), using a long-wave infrared radiation produced by a CO_2 laser and recorded on a microbolometer array. Experimental results showing how ... [Appl. Opt. 52, A56-A67 (2013)]

Publication year: 2012
Source: Optics & Laser Technology, Volume 44, Issue 1, February 2012, Pages 210-217
Xin, Sun , Bing-liang, Hu , Li-bo, Li , Zhong-hou, Wang
An engineering prototype of Hadamard transform spectral imager for object detection is presented. The programmable mask, using Digital Micro-mirror Device, is set on the second image plane to implement the function of spectral domain encoding. This method can significantly increase the detecting possibility with improved SNR of the relatively weak spectrum signature. A refractive configuration designed for visible spectrum application is proposed, and the optical design strategies of each functional unit are described in detail in order to meet both the image quality and the structural feasibility. The method of mask positioning is studied and the promising spectral recovery results...
 Highlights: ► Engineering prototype of visible spectrum-encoding HTSI is constructed. ► Optical design strategies of the refractive configuration are discussed in detail. ► Mask positioning method is presented and its validity is verified by experimental results.

Zachary M. Geballe and Raymond Jeanloz
Many high-pressure high-temperature studies using laser-heated diamond cells have documented plateaus in the increase of temperature with increasing laser power or with time. By modeling heat transfer in typical laser-heated diamond anvil cell experiments, we demonstrate that latent heat due to melt ... [J. Appl. Phys. 111, 123518 (2012)] published Mon Jun 25, 2012.

Author(s): M. Holler, F. Schapper, L. Gallmann, and U. Keller
We perform attosecond time-resolved transient absorption spectroscopy around the first ionization threshold of helium and observe rapid oscillations of the absorption of the individual harmonics as a function of time delay with respect to a superimposed, moderately strong infrared laser field. The p...
[Phys. Rev. Lett. 106, 123601] Published Mon Mar 21, 2011

J. Javaloyes, S. Balle
Multimode dynamics in bidirectional laser cavities can be accurately described by folding space into time delay. This results in a set of delayed algebraic equations that preserve the dynamics of all cavity modes while drastically reducing number of degrees of freedom. This reduction allows for ... [Opt. Express 20, 8496-8502 (2012)]