G - Physics – 02 – F
Patent
G - Physics
02
F
G02F 1/01 (2006.01) G02F 1/35 (2006.01) G02F 1/37 (2006.01)
Patent
CA 2486246
Disclosed is an apparatus for autonomously compressing, phase-compensating and waveform-shaping an ultrashort light pulse that is fast and high in sensitivity in compensating for phase fluctuations and allows the use of a usual laser light source that is low in light intensity and has large temporal fluctuations in phase. The apparatus comprises: a pulsed light source (2); a spectroscopic spatial dispersing device (4) for spatially dispersing a light pulse (3) emitted from the pulsed light source (2) into spectral components thereof; a spatial light modulator (5) for adding a phase to each of the spectral components of the spatially dispersed light pulse (3); a multiplexer (6) for combining the phase added spectral components of the light pulse (3) together to form a composite output light pulse (7); a modified SPIDER device (8) for forming a spectral interference figure from a portion of the composite output light pulse (7); and a feedback device (9) for detecting a spectral phase from the spectral interference figure and feeding a signal representing a difference between the detected spectral phase and a pre-established phase back to the spatial light modulator (5). The modified SPIDER device (8) comprises: a pulsed light source for a chirped light pulse (8a); a delay unit (8c) for delaying a light pulse (8b) from the pulsed light source (8a) with an adjustable delay time; a dispersive medium (28) for forming a chirped light pulse (29) from the light pulse whose delay time is adjusted by the delay unit (8c); a replica pulse former (24) for forming from a portion of the output light pulse (7) a pair of replica light pulses (24a, 24b) one delayed after the other; a nonlinear optical crystal (31) for frequency-mixing the two replica pulses (24a, 24b) with the chirped light pulse (29); a spectrometer (8e) for forming an interference figure of the resultant two frequency-mixed replica light pulses; and an image reader (8f) for reading the interference figure of the two frequency-mixed replica light pulses.
L'invention concerne un dispositif autonome de compression d'impulsion optique ultracourte, de compensation de phase et de façonnage de forme d'onde pouvant compenser une fluctuation de phase à une vitesse élevée avec une sensibilité élevée. Un tel dispositif comprend une source lumineuse d'impulsion optique (2), un distributeur spatial de spectre (4), un modulateur de phase spatial (5), un multiplexeur (6), un dispositif SPIDER modifié (8) permettant de former une image d'interférence du spectre à partir d'une partie de l'impulsion de sortie multiplexée, ainsi qu'un dispositif de rétroaction (9) détectant la phase du spectre à partir de la figure d'interférence du spectre et alimentant la différence issue de la phase réglée dans le modulateur de phase spatial (5). Le dispositif SPIDER modifié (8) comprend une source lumineuse (8a) destinée à une impulsion optique comprimée.
Hirasawa Masakatsu
Yamashita Mikio
Japan Science And Technology Agency
Marks & Clerk
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