Results 231 to 240 of about 13,087 (290)

Integrated ultrafast saturable absorber

Optics Letters, 1994
An ultrafast saturable absorber was demonstrated experimentally in AlGaAs, operated with a photon energy below half the band gap, near 1555 nm. Both the saturation intensity and the linear transmission can be independently designed in the structure. The device is based on spatial soliton emission from a tapered channel waveguide with a corresponding ...
A, Villeneuve, J S, Aitchison, J U, Kang, P G, Wigley, G I, Stegeman   +4 more
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Metamaterial saturable absorber mirror

Optics Letters, 2013
We propose a metamaterial saturable absorber mirror at midinfrared wavelengths that can show a saturation of absorption with intensity of incident light and switch to a reflecting state. The design consists of an array of circular metallic disks separated by a thin film of vanadium dioxide (VO(2)) from a continuous metallic film. The heating due to the
Govind, Dayal, S Anantha, Ramakrishna
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Broadband fast semiconductor saturable absorber

Optics Letters, 1992
Kerr lens mode-locked (KLM) solid-state lasers are typically not self-starting. We address this problem by introducing a broadband semiconductor saturable absorber that could be used as a tunable, all-solid-state, passive starting mechanism. We extend the wavelength tunability of a semiconductor saturable absorber to more than 100 nm using a band-gap ...
G R, Jacobovitz-Veselka, U, Kellerm, T, Asom   +2 more
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Single-mode-fiber saturable absorber

Optics Letters, 1984
Saturable absorption is performed on a signal in a single-mode fiber by allowing the evanescent field of the guided wave to interact with a saturable-absorbing dye. The evanescent field is exposed by mechanically removing a portion of the fiber cladding. The saturable material is then placed in close proximity to the fiber core.
W V, Sorin, R C, Youngquist, C C, Cutler, H J, Shaw   +3 more
openaire   +2 more sources

Vertical-cavity saturable absorber intensity modulator

Journal of Lightwave Technology, 2003
We propose and demonstrate a reflection-type optical modulator, with surface-normal architecture, that exploits the optical saturation of absorption in semiconductor quantum wells. The modulation section of the modulator, which is composed of quantum wells placed within a Fabry-Perot cavity, is optically controlled by an intensity-modulated beam ...
M, Guina, A, Vainionpää, A, Harkonen, L, Orsila, J, Lyytikäinen, O G, Okhotnikov   +5 more
openaire   +2 more sources

The generalized saturable absorber

IEEE Photonic Society 24th Annual Meeting, 2011
We extend the concept of the saturable absorber made of two linear polarizers and a fiber section to a structure with multiple polarizers and fibers. The structure is studied with simple analytical relations and full numerical simulations. We stablish design procedures for fiber lasers.
Rafael Gomez Alcala, Antonio Dengra
openaire   +1 more source

All-Fiber Chalcogenide Saturable Absorber

2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2021
Pulsed fiber lasers in the 2 μm wavelength window have become important tools in spectroscopy, medical surgery, and material processing [1] . Passive saturable absorbers (SA) based on multimode interference (MMI), graphene, and carbon nanotubes have been proposed to induce modelocking into thulium-doped fiber lasers (TDFLs) [2] – [4] .
Arslan Anjum, Martin Rochette
openaire   +1 more source

Saturation-Induced Perfect Absorbers

Conference on Lasers and Electro-Optics, 2018
We introduce a new regime of optical absorption where increasing the incoming intensity - equivalently inducing optical saturation - leads to the enhancement of total absorption in a device, and always reaches 100% at a critical value.
Jahromi, Ali K., Abouraddy, Ayman F.
openaire   +2 more sources

Saturable absorber intensity modulator

IEEE Journal of Quantum Electronics, 2003
We propose and demonstrate a reflection-type optical modulator, with surface-normal architecture that exploits saturation of absorption in semiconductor quantum wells pumped optically. The modulation section, composed of quantum wells placed within a Fabry-Perot cavity, is exposed to an intensity-modulated beam generated by an in-plane laser integrated
M.D. Guina, A. Vainionpaa, L. Orsila, A. Harkonen, J. Lyytikainen, L.A. Gomes, O.G. Okhotnikov   +6 more
openaire   +1 more source

Microscopic analysis of saturable absorbers: Semiconductor saturable absorber mirrors versus graphene

Journal of Applied Physics, 2016
Fully microscopic many-body calculations are used to study the influence of strong sub-picosecond pulses on the carrier distributions and corresponding optical response in saturable absorbers used for mode-locking—semiconductor (quantum well) saturable absorber mirrors (SESAMs) and single layer graphene based saturable absorber mirrors (GSAMs).
J. Hader, H.-J. Yang, M. Scheller, J. V. Moloney, S. W. Koch   +4 more
openaire   +1 more source