Publication

Fourier-plane spatial frequency modulation imaging: enhanced resolution imaging with a single, ultrashort pulse

Yves Bellouard
2025

Résumé

Single-shot spatial frequency-resolved imaging (SPIFI) is demonstrated for the first time, to our knowledge, using only a single 30 fs pulse. Earlier single-shot SPIFI configurations integrated a train of laser pulses, operated in an image plane conjugate to the object plane, and required a 2D detector. Here, a single pulse is selected, the data are collected in the Fourier plane, and the signal can be captured with 1D detection. The resultant improvement in spatial frequency support, characteristic of single-shot SPIFI, is shown to be conserved in this new architecture, to our knowledge. This advancement allows increased resolution of physical events gated by a femtosecond pulse.

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https://infoscience.epfl.ch/entities/publication/e8d6a0bb-0540-4d66-8593-eb83982c7a73

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Yves Bellouard
2025

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/e8d6a0bb-0540-4d66-8593-eb83982c7a73

À propos de ce résultat

Concepts associés (31)

Ultrashort pulse

In optics, an ultrashort pulse, also known as an ultrafast event, is an electromagnetic pulse whose time duration is of the order of a picosecond (10−12 second) or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators. Amplification of ultrashort pulses almost always requires the technique of chirped pulse amplification, in order to avoid damage to the gain medium of the amplifier. They are characterized by a high peak intensity (or more correctly, irradiance) that usually leads to nonlinear interactions in various materials, including air.

Femtosecond pulse shaping

In optics, femtosecond pulse shaping refers to manipulations with temporal profile of an ultrashort laser pulse. Pulse shaping can be used to shorten/elongate the duration of optical pulse, or to generate complex pulses. Generation of sequences of ultrashort optical pulses is key in realizing ultra high speed optical networks, Optical Code Division Multiple Access (OCDMA) systems, chemical and biological reaction triggering and monitoring etc.

Pulsed laser

Pulsed operation of lasers refers to any laser not classified as continuous wave, so that the optical power appears in pulses of some duration at some repetition rate. This encompasses a wide range of technologies addressing a number of different motivations. Some lasers are pulsed simply because they cannot be run in continuous mode. In other cases the application requires the production of pulses having as large an energy as possible.

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Publications associées (5)

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Fourier-plane spatial frequency modulation imaging: enhanced resolution imaging with a single, ultrashort pulse

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