OPTICAL SYSTEM AND METHOD FOR ULTRASHORT LASER PULSE CHARACTERIZATION

OPTICAL SYSTEM AND METHOD FOR ULTRASHORT LASER PULSE CHARACTERIZATION

The optical system comprises: means (110) for introducing a controlled negative or positive chirp to an incoming ultrashort laser pulse to be characterized (101); a nonlinear optical medium (120) through which said chirped ultrashort laser pulse (111) is propagated, wherein as a result of said propa...

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Bibliographische Detailangaben
Hauptverfasser: TRULL SILVESTRE, JOSE FRANCISCO, SOLA LARRANAGA, INIGO JUAN, COJOCARU, CRINA MARIA, ROMERO MUNIZ, ROSA MARIA, MAIA DA SILVA, FRANCISCO JOSE, PAIVA REBELO CEREJO CRESPO, HELDER MANUEL
Format: Patent
Sprache:eng ; fre
Schlagworte:
BASIC ELECTRIC ELEMENTS
COLORIMETRY
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
DEVICES USING STIMULATED EMISSION
ELECTRICITY
FREQUENCY-CHANGING
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
RADIATION PYROMETRY
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
TESTING
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Beschreibung
Zusammenfassung:The optical system comprises: means (110) for introducing a controlled negative or positive chirp to an incoming ultrashort laser pulse to be characterized (101); a nonlinear optical medium (120) through which said chirped ultrashort laser pulse (111) is propagated, wherein as a result of said propagation: different chirp values are introduced in the ultrashort laser pulse (111) at different propagation distances along the nonlinear optical medium (120), and a transverse nonlinear signal (125) is generated in a direction perpendicular to the propagation axis; analyzing means (130) configured for recording a single-shot spectral image of said generated transverse nonlinear signal (125); and a processing module (140) comprising one or more processors configured to execute a numerical iterative algorithm to said single-shot spectral image to retrieve the electric field, amplitude and phase, of the ultrashort laser pulse (101). Selon l'invention, le système optique comprend : un moyen (110) permettant d'introduire une fluctuation de longueur d'onde contrôlée positive ou négative sur une impulsion laser ultracourte entrante à caractériser (101) ; un milieu optique non linéaire (120) au travers duquel ladite impulsion laser ultracourte avec la fluctuation de longueur d'onde (111) se propage, où suite à ladite propagation : différentes valeurs de fluctuation de longueur d'onde sont introduites dans l'impulsion laser ultracourte (111) à différentes distances de propagation le long du milieu optique non linéaire (120), et un signal non linéaire transversal (125) est produit dans une direction perpendiculaire à l'axe de propagation ; des moyens d'analyse (130) configurés pour enregistrer une image spectrale unique dudit signal non linéaire transversal (125) produit ; et un module de traitement (140) comprenant un ou plusieurs processeurs configurés pour appliquer un algorithme itératif numérique à l'image spectrale unique pour extraire le champ électrique, l'amplitude et la phase de l'impulsion laser ultracourte (101).