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Pulse Generation (pulse + generation)

Distribution by Scientific Domains
Physics and Astronomy75%

Selected Abstracts

Ultrafast photonic crystal lasers

LASER & PHOTONICS REVIEWS, Issue 4 2008
D. Englund
Abstract We describe recent progress in photonic crystal nanocavity lasers with an emphasis on our recent results on ultrafast pulse generation. These lasers produce pulses on the picosecond scale, corresponding to only hundreds of optical cycles. We describe laser dynamics in optically pumped single cavities and in coupled cavity arrays, at low and room temperature. Such ultrafast, efficient, and compact lasers show great promise for applications in high-speed communications, information processing, and on-chip optical interconnects. [source]

Advances in laser technology for isolated attosecond pulse generation

LASER PHYSICS LETTERS, Issue 4 2009
C. Vozzi
Abstract In this review we report on recent advances in laser technology, which have contributed to the fast development of attosecond science. In particular we will concentrate on two experimental methods for the generation of high-peak-power, fewoptical-cycle laser pulses with controlled electric field, which are crucial for the generation of isolated attosecond pulses. The first method is the hollow-fiber compression technique, introduced in 1996 and now routinely used in several laboratories. So far, isolated attosecond pulses have been generated by using few-cycle pulses produced by such compression technique, in combination with active stabilization of the carrier-envelope phase. More recently, few-cycle pulses tunable in the infrared region have been generated by optical parametric amplification with passive stabilization of the carrier-envelope phase. Such parametric sources represent excellent drivers for the generation of harmonic radiation with an extended cutoff, and offer the possibility to extend attosecond science towards the soft-X rays region. Finally, we will briefly discuss the basic elements of attosecond metrology. (© 2009 by Astro Ltd., Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Switchable pulses generation in passively Q-switched multilongitudinal-mode microchip laser

LASER PHYSICS LETTERS, Issue 2 2007
J. Dong
Abstract Periodical switching laser pulses with nanosecond pulse width and several kilowatts peak power from wideseparated multilongitudinal-mode oscillation were observed experimentally in laser-diode pumped passively Q-switched Yb:YAG microchip laser with Cr4+:YAG as saturable absorber. Pulses from different longitudinal modes oscillate alternatively. Periodical pulses oscillation dynamics induced by spatial hole burning effect and mode competition was investigated numerically by the evolution of the inversion population of different modes and the bleaching and recovery of the inversion population of the saturable absorber. The numerical simulations of switchable periodical pulsation of multilongitudinal-mode passively Q-switched Yb:YAG/Cr4+:YAG microchip lasers are in good agreement with experimental results and confirmed that such pulsations are an intrinsic property in passively Q-switched Yb:YAG/Cr4+:YAG microchip lasers. (© 2007 by Astro, Ltd. Published exclusively by WILEY-VCH Verlag GmbH & Co. KGaA) [source]

Dark soliton generation using dual Brillouin fiber laser in a fiber optic ring resonator

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2010
S. F. Hanim
Abstract Stable dark soliton pulses have been successfully generated in an erbium doped dispersion compensated fiber (DCF) using an enhanced dual Brillouin fiber laser (DBFL) scheme.Multidark soliton pulses generation in an S-band erbium doped depressed cladding fiber (DC-EDF) using a multiwavelength Brillouin fiber laser (MW-BFL). Configuration has also been successfully demonstrated. The hybrid amplification from the 300 mW power of Raman pump (RP), 7.7 km long DCF, and 30 m DC-EDF that is being pumped bidirectionally results in a stable multiwavelength Brillouin peaks in the S-band region. Results obtained shows that the insertion of linear gain medium with bidirectional pumping of the DC-EDF into the cavity gives significant amplification and promotes the formation of stokes peaks in the S-band region. The number of Brillouin peaks generated is closely dependent on the DBFL and MW-BFL configuration, the Brillouin pump (BP) signal wavelength, the BP coupling ratio, and the RP power. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:881,883, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25036 [source]