Laser diode bistability as sensor of optical signals pameters

Laser Diodes have been employed many times as light sources on different kinds of optical sensors. Their main function in these applications was the emission of an optical radiation impinging onto a certain object and, according to the characteristics of the reflected light, some information about this object was obtained. Laser diodes were acting, in a certain way, just as passive devices where their only function was to provide the adequate radiation to be later measured and analyzed. The objective of this paper is to report a new concept on the use of laser diodes taking into account their optical bistable properties. As it has been shown in several places, different laser diodes as, for example, DFB lasers and FP lasers, offer bistable characteristics being these characteristics a function of different parameters as wavelength, light polarization or temperature. Laser Bistability is strongly dependent on them and any small variation of above parameters gives rise to a strong change in the characteristics of its non-linear properties. These variations are analyzed and their application in sensing reported. The dependence on wavelength, spectral width, input power and phase variations, mainly for a Fabry-Perot Laser structure as basic configuration, is shown in this paper.

Impact de l’âge et des variations pluviométriques sur la croissance du pin d’Alep (Pinus halepensis. MILL): Cas du peuplement artificiel de la forêt domaniale de Tlemcen. (Algeria)

La comparaison des résultats de l’analyse dendrochronologique et dendroclimatologique du Pin d’Alep de la forêt domaniale de Tlemcen a été réalisée en conditions stationnelles particulières. L’analyse de la croissance des cernes annuels et des rapports des écarts relatifs des cernes successifs montrent une nette tendance régressive chez les arbres jeunes. La sensibilité moyenne (SM) et les coefficients d’inter datation (SR) respectifs aux jeunes arbres et aux plus âgés confirment la dépendance assez forte des premiers aux facteurs climatiques particulièrement à la pluviométrie. Les résultats de ce travail ont permis d’établir une relation pluviométrie / accroissement radial en fonction de l’âge de leur formation. Ainsi, il est établi qu’à partir de ces résultats particulièrement ceux des valeurs des sensibilités moyennes (SM) que les conséquences probables des variations climatiques influentes sensiblement sur les jeunes sujets. Aussi pour éviter les changements d’ordre physio biologiques liés au vieillissement des arbres, il est préférable de comparer les cernes sur une période de 40 à 50 ans comme c’est le cas des six échantillons choisis dans la zone d’étude.

Acusacion presentada ante el Tribunal Superior del Distrito Norte de la Baja California contra el licenciado Juan Prieto y Quemper por los licenciados Juan R. Orcí, Manuel Piña y Cuevas y Miguel Bolaños Cacho.

Mode of access: Internet.

(Pin jia jing she jiao kan) Da zang jing zong mu /

Double leaves, oriental style, in case.

Beacon: a light emitting diode television display.

"Supported in part by contract no. US AEC AT(11-1) 1469."

Tunnel diode circuits coupled into transmission lines.

Mode of access: Internet.

Tunnel diode circuits based on lumped constant circuitry /

"This work was supported in part by the Office of Naval Research under Contract No. Nonr-1834(15)"

Draft environmental impact statement/section 4(f) evaluation : for PIN 3047.04 Route 96 improvement from Meadow Street in City of Ithaca to Duboise Road in Town of Ithaca, Tompkins County, State of New York : submitted pursuant to 42 USC 4332(2)(c) and 49 USC 303 /

Report no. FHWA-NY-EIS 88-01-D.

Opera omnia : novo ordine digesta & in V tomos distributa ... quibus accessêre Henrici de Hassia, Petri de Alliaco, Johannis Brevicoxae, Joannis de Varenis ... ac insuper Jacobi Alaïni & Joannis Majoris tractatus, partim inediti, necnon monumenta omnia ad causam Joannis Parvi pertinentia, opera et studio M. Lud. Ellies Du Pin ... qui huic novae editioni praefixit Gersoniana.

Xerographic copy.

Tunnel diode circuit investigation.

At head of title: Final report, Project TUN.

Chen hai miao pin

Mode of access: Internet.

Supplément a la monographie des roses des Alpes Maritimes : additions diverses : observations sur le fascicule VI des Primitiae de M. Crépin /

Imprint obscured by label: Editions Paul Lechevalier ... Paris.