Del Mar Photonics

Del Mar Photonics - Del Mar Photonics at Optics and Photonics 2008

Pump probe experiment for light scattering media diagnosis (Paper Presentation)
Paper 7065-34 of Conference 7065
Authors(s): Marie Barthelemy, Thibault Dartigalongue, Laurent Hespel, Nicolas Rivière, ONERA (France); Gérard Gréhan, Univ. de Rouen (France)
Date: Tuesday, 12 August 2008
Optical density measurement is a very powerful tool to characterize particle size and physical property of diffuse media such as jets and engine injection.The major difficulty of such a measurement is the tremendous amount of diffused light : for such media, the optical density can be greater than 10. The goal of this work is to develop a new experimental tool, based on femtosecond laser technology in order to isolate (spatially and temporally) a very limited amount of non diffused transmitted light, and to measure the extinction of diffuse media.

Pump-probe photothermal lens experiment for measuring the thermal diffusivity coefficient of organic solvent (Paper Presentation)
Paper 7049-11 of Conference 7049
Authors(s): Aristides Marcano, Aaron Zelinskas, Noureddine Melikechi, Delaware State Univ.
Date: Wednesday, 13 August 2008
We report on a pump-probe photothermal lens experiment aimed for the measurement of thermal diffusivity coefficient of organic samples in the CW regime. We show that when the probe beam is collimated and the pump beam is focused the time dependence of the signal does not depend on the sample position. This effect allows simple determination of the thermal diffusivity coefficient and its effective calibration using reference samples. We use this method to determine the thermal diffusivity of distilled water, methanol, carbon bisulfide, nitrobenzene and other organic solvents.

Time-resolved optical microscopy of single gold nanoparticles (Paper Presentation)
Paper 7032-16 of Conference 7032
Authors(s): Anna L. Tchebotareva, Leiden Univ. (Netherlands); Peter Zijlstra, Swinburne Univ. of Technology (Australia); Markus Lippitz, Univ. Stuttgart (Germany); James W. M.Chon, Swinburne Univ. of Technology (Australia); Michel Orrit, Leiden Univ. (Netherlands)
Date: Sunday, 10 August 2008
We study single gold nanospheres and nanorods or simple clusters thereof (pairs, triplets) by a pump-probe interferometric technique in a far-field microscope. The time-resolved traces reveal detailed information about the selected individual particles, free from ensemble averaging. Besides the electronic response, various modes of mechanical oscillations become visible, and their true damping times can be directly measured. These results open mechanical studies at the nanometer and picosecond scales.

Control of surface plasmons with phase-correlated femtosecond light fields (Paper Presentation)
Paper 7032-15 of Conference 7032
Authors(s): Atsushi Kubo, Univ. of Tsukuba (Japan); Hrvoje Petek, Univ. of Pittsburgh
Date: Sunday, 10 August 2008
Optical control of surface plasmon (SP) fields and its time-resolved microscopic imaging are demonstrated by means of phase-correlated 10fs laser pulse pair excitation of two photon photoemission combined with photoemission electron microscopy. Excitation pump-probe light pulses, with mutual delay controlled to better than 50as accuracy, couple to SPs at nano-scale optical patterns fabricated in deposited silver films. Evolution of the SP fields is imaged thorough a polarization grating created by interference with the external excitation light field. Simulation based on the complex SP wave vector and Huygens' principle explains the experimental results.

Picosecond carrier dynamics and thermal-optical modulation in Si nanocrystals (Paper Presentation)
Paper 7030-22 of Conference 7030
Authors(s): Jeremy A. Rowlette, Rohan D. Kekatpure, Matt A. Panzer, Kenneth E. Goodson, Mark L. Brongersma, Stanford Univ.
Date: Tuesday, 12 August 2008
Silicon nanocrystals (nc-Si) may eventually become key building blocks for on-chip light generation, conversion, and modulation. Understanding the details of nanocrystal carrier dynamics which control free-carrier absorption (FCA), nonradiative Auger recombination and heat generation is essential for making technological progress towards achieving net optical gain and fast, efficient all-optical modulation. Using a picosecond pump-probe differential absorption technique, we have measured FCA cross-sections, Auger recombination lifetimes, and heat transfer dynamics in PECVD deposited nc-Si/SiO2 thin films which luminesce in the 600-950 nm spectral band. We will discuss the dependency of Auger lifetimes on pump fluence, ambient temperature, and particle size distribution.

Ultrafast optical switching and laser dynamics in distributed feedback polymer lasers (Paper Presentation)
Paper 7051-47 of Conference 7051
Authors(s): Stefano Perissinotto, Margherita Zavelani-Rossi, Marco Carvelli, Guglielmo Lanzani, Politecnico di Milano (Italy); Marco Salerno, Instituto Italiano di Tecnologia (Italy); Giuseppe Gigli, Univ. degli Studi di Lecce (Italy)
Date: Tuesday, 12 August 2008
In this work the photon-exciton and laser dynamics of organic distributed feedback lasers are investigated by applying the pump-probe technique to devices under operation [1].
Moreover we demonstrate a range of modulation techniques, including optical gating and two photon pumping . We mainly show all optical control of the laser by applying a gating pulse, which completely switch-off emission in the sub-ps time scale and may represent a possible way for integration of organic photonics . The switching mechanism is assigned to photo-injection of charge carriers induced by the gate transition [2].

[1] M. Zavelani-Rossi, S. Perissinotto, G. Lanzani, M. Salerno, G. Gigli, Appl. Phys. Lett. 89, 181105 (2006).
[2] S. Perissinotto, G. Lanzani, M. Zavelani-Rossi, M.Salerno, G. Gigli, Appl. Phys. Lett. 91, 191108 (2007).

Ultrafast optical switching and laser dynamics in distributed feedback polymer lasers (Paper Presentation)
Paper 7049-47 of Conference 7049
Authors(s): Stefano Perissinotto, Margherita Zavelani-Rossi, Marco Carvelli, Guglielmo Lanzani, Politecnico di Milano (Italy); Marco Salerno, Instituto Italiano di Tecnologia (Italy); Giuseppe Gigli, Univ. degli Studi di Lecce (Italy)
Date: Tuesday, 12 August 2008
In this work the photon-exciton and laser dynamics of organic distributed feedback lasers are investigated by applying the pump-probe technique to devices under operation [1].
Moreover we demonstrate a range of modulation techniques, including optical gating and two photon pumping . We mainly show all optical control of the laser by applying a gating pulse, which completely switch-off emission in the sub-ps time scale and may represent a possible way for integration of organic photonics . The switching mechanism is assigned to photo-injection of charge carriers induced by the gate transition [2].

[1] M. Zavelani-Rossi, S. Perissinotto, G. Lanzani, M. Salerno, G. Gigli, Appl. Phys. Lett. 89, 181105 (2006).
[2] S. Perissinotto, G. Lanzani, M. Zavelani-Rossi, M.Salerno, G. Gigli, Appl. Phys. Lett. 91, 191108 (2007).

Optical studies of plasmonic metamaterials (Paper Presentation)
Paper 7033-49 of Conference 7033
Authors(s): Valy Z. Vardeny, The Univ. of Utah
Date: Wednesday, 13 August 2008

Ultrafast Dynamics Research Tools - Reserve a spot in our Ultrafast Dynamics Tools training workshop during this summer in San Diego, California

Beacon femtosecond fluorescence up-conversion (optical gating) spectrometer
Hatteras Ultrafast Transient Absorption Spectrometer

Femtosecond Lasers - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California

Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond Ti:Sapphire laser with integrated DPSS pump laser
Teahupoo Rider femtosecond amplified Ti:Sapphire laser
Mavericks femtosecond Cr:Forsterite laser
Tamarack femtosecond fiber laser (Er-doped fiber)
Buccaneer femtosecond OA fiber laser (Er-doped fiber) and SHG
Cannon Ultra-broadband light source
Tourmaline femtosecond Yt-doped fiber laser
Chata femtosecond Cr:ZnSe laser (2.5 micron) coming soon
Phonics West 2008: applications of femtosecond lasers

High Power Femtosecond Laser Systems - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California

Cortes 800 tabletop 40 TW Ti:Sapphire laser system
Cortes E - High vacuum laser ablation/deposition system with 2 TW Ti:Sapphire laser
Cortes K - femtosecond seed laser for Petawatt KrF excimer laser
Cortes O 200TW femtosecond laser - KD*P CPOPA based amplifier system
Jaws femtosecond Cr:forsterite Multi-Terawatt Amplified Laser
High-vacuum system for laser ablation/deposition

Femtosecond pulse measurement instrumentation - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California

Reef scanning and single shot femtosecond autocorrelators
Avoca SPIDER - Spectral phase interferometry for direct electric-field reconstruction (SPIDER)
Rincon third order femtosecond cross-correlator (third order autocorrelator TOAC) also referred to as contrastmeter

Femtosecond Systems and Accessories - Reserve a spot in our femtosecond Ti:Sapphire training workshop during this summer in San Diego, California

Femtosecond Micromachining
Femtosecond nanophotonics
Femtosecond NSOM
Pacifica femtosecond fiber laser based terahertz spectrometer
Pismo pulse picker (ultrafast electro-optical shutter)
Wavelength conversion: second and third harmonics generators for femtosecond lasers
Jibe white light continuum generator
Kirra Optical Faraday Rotators and Isolators

Laser accessories

Diffractive Variable Attenuator for high power lasers
Deformable mirrors - active elements for adaptive optics systems - Reserve a spot in our Adaptive optics and wavefront sensors workshop in San Diego
ShaH - the family of fast, accurate and reliable wavefront sensors
Complete adaptive optics systems
Faraday rotators and isolators for high-power (up to 1kW) laser beams
SAM - Saturable Absorber Mirrors
PCA - Photoconductive antenna for terahertz applications

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