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25 results on '"Verhoef, Aart J."'

5. Implementation of Bessel-like LP02 Mode from Higher Order Mode (HOM) Fiber to extend the Depth of Focus in Fourier Domain Optical Coherence Microscopy (FD-OCM)

Author

Dipankar Sen, Anton Classen, Lars Grüner-Nielsen, Gibbs, Holly C., Shahriar Esmaeili, Philip Hemmer, Andrius Baltuska, Sokolov, Alexei V., Leitgeb, Rainer A., Alma Fernández, and Verhoef, Aart J.

Abstract

A fiber-based robust, design-flexible FD-OCM technique using a Bessel-like LP02 mode is demonstrated. Extended DOF compared to Gaussian illumination of equal spot-size at focus is reported. We characterize the resolution performance of this system.

Published
2022
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6. Implementation of Bessel-like LP02 Mode from Higher Order Mode (HOM) Fiber to extend the Depth of Focus in Fourier Domain Optical Coherence Microscopy (FD-OCM)

Author

Sen, Dipankar, primary, Classen, Anton, additional, Grüner-Nielsen, Lars, additional, Gibbs, Holly C., additional, Esmaeili, Shahriar, additional, Hemmer, Philip, additional, Baltuska, Andrius, additional, Sokolov, Alexei V., additional, Leitgeb, Rainer A., additional, Fernández, Alma, additional, and Verhoef, Aart J., additional

Published
2022
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7. Modeling the Image Formation Process in Fourier Domain Optical Coherence Microscopy for a Bessel-like LP02 Mode from a Higher Order Mode Fiber

Author

Classen, Anton, primary, Sen, Dipankar, additional, Grüner-Nielsen, Lars, additional, Gibbs, Holly C., additional, Esmaeili, Shahriar, additional, Hemmer, Philip, additional, Baltuska, Andrius, additional, Sokolov, Alexei V., additional, Leitgeb, Rainer A., additional, Fernández, Alma, additional, and Verhoef, Aart J., additional

Published
2022
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8. Extended focal depth Fourier domain optical coherence microscopy with a Bessel-beam – LP02 mode – from a higher order mode fiber

Author

Sen, Dipankar, primary, Classen, Anton, additional, Fernández, Alma, additional, Grüner-Nielsen, Lars, additional, Gibbs, Holly C., additional, Esmaeili, Shahriar, additional, Hemmer, Philip, additional, Baltuska, Andrius, additional, Sokolov, Alexei V., additional, Leitgeb, Rainer A., additional, and Verhoef, Aart J., additional

Published
2021
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10. Epi-detecting label-free multimodal imaging platform using a compact diode-pumped femtosecond solid-state laser

Author

Andreana, Marco, Le, Tuan, Hansen, Anders Kragh, Verhoef, Aart J., Jensen, Ole Bjarlin, Andersen, Peter E., Slezak, Paul, Drexler, Wolfgang, Fernández, Alma, Unterhuber, Angelika, Andreana, Marco, Le, Tuan, Hansen, Anders Kragh, Verhoef, Aart J., Jensen, Ole Bjarlin, Andersen, Peter E., Slezak, Paul, Drexler, Wolfgang, Fernández, Alma, and Unterhuber, Angelika

Abstract

We have developed an epi-detected multimodal nonlinear optical microscopy platform based on a compact and cost-effective laser source featuring simultaneous acquisition of signals arising from hyperspectral coherent anti-Stokes Raman scattering (CARS), two-photon fluorescence, and second harmonic generation. The laser source is based on an approach using a frequency-doubled distributed Bragg reflector-tapered diode laser to pump a femtosecond Ti:sapphire laser. The operational parameters of the laser source are set to the optimum trade-off between the spectral and temporal requirements for these three modalities, achieving sufficient spectral resolution for CARS in the lipid region. The experimental results on a biological tissue reveal that the combination of the epi-detection scheme and the use of a compact diode-pumped femtosecond solid-state laser in the nonlinear optical microscope is promising for biomedical applications in a clinical environment

Published
2017

16. Optical Detection of Tunneling Ionization

Author

Verhoef, Aart J., primary, Mitrofanov, Alexander V., additional, Serebryannikov, Evgenii E., additional, Kartashov, Daniil V., additional, Zheltikov, Aleksei M., additional, and Baltuška, Andrius, additional

Published
2010
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17. Self-compression of millijoule 15 μm pulses

Author

Mücke, Oliver D., primary, Ališauskas, Skirmantas, additional, Verhoef, Aart J., additional, Pugžlys, Audrius, additional, Baltuška, Andrius, additional, Smilgevičius, Valerijus, additional, Pocius, Jonas, additional, Giniūnas, Linas, additional, Danielius, Romualdas, additional, and Forget, Nicolas, additional

Published
2009
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23. Modeling the Image Formation Process in Fourier Domain Optical Coherence Microscopy for a Bessel-like LP02 Mode from a Higher Order Mode Fiber

Author

Anton Classen, Dipankar Sen, Lars Grüner-Nielsen, Gibbs, Holly C., Shahriar Esmaeili, Philip Hemmer, Andrius Baltuska, Sokolov, Alexei V., Leitgeb, Rainer A., Alma Fernández, and Verhoef, Aart J.

Abstract

We model the full image formation process in FD-OCM for a Bessel-like LP02 illumination beam as well as Gaussian beams. The LP02 beam generated in a HOM fiber enables design flexibility and an extended DOF.

24. Extended focal depth Fourier domain optical coherence microscopy with a Bessel-beam - LP 02 mode - from a higher order mode fiber.

Author

Sen D, Classen A, Fernández A, Grüner-Nielsen L, Gibbs HC, Esmaeili S, Hemmer P, Baltuska A, Sokolov AV, Leitgeb RA, and Verhoef AJ

Abstract

We present a robust fiber-based setup for Bessel-like beam extended depth-of-focus Fourier-domain optical coherence microscopy, where the Bessel-like beam is generated in a higher order mode fiber module. In this module a stable guided LP 02 core mode is selectively excited by a long period grating written in the higher order mode fiber. Imaging performance of this system in terms of lateral resolution and depth of focus was analyzed using samples of suspended microbeads and compared to the case where illumination is provided by the fundamental LP 01 mode of a single mode fiber. Illumination with the LP 02 mode allowed for a lateral resolution down to 2.5 µm as compared to 4.5 µm achieved with the LP 01 mode of the single mode fiber. A three-fold enhancement of the depth of focus compared to a Gaussian beam with equally tight focus is achieved with the LP 02 mode. Analysis of the theoretical lateral point spread functions for the case of LP 01 and LP 02 illumination agrees well with the experimental data. As the design space of waveguides and long-period gratings allows for further optimization of the beam parameters of the generated Bessel-like beams in an all-fiber module, this approach offers a robust and yet flexible alternative to free-space optics approaches or the use of conical fiber tips., Competing Interests: The authors declare no conflicts of interest., (© 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.)

Published
2021
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25. Self-compression of millijoule 1.5 microm pulses.

Author

Mücke OD, Alisauskas S, Verhoef AJ, Pugzlys A, Baltuska A, Smilgevicius V, Pocius J, Giniūnas L, Danielius R, and Forget N

Abstract

We demonstrate a four-stage optical parametric chirped-pulse amplification system that delivers carrier-envelope phase-stable approximately 1.5 microm pulses with energies up to 12.5 mJ before recompression. The system is based on a fusion of femtosecond diode-pumped solid-state Yb technology and a picosecond 100 mJ Nd:YAG pump laser. Pulses with 62 nm bandwidth are recompressed to a 74.4 fs duration close to the transform limit. To show the way toward a terawatt-peak-power single-cycle IR source, we demonstrate self-compression of 2.2 mJ pulses down to 19.8 fs duration in a single filament in argon with a 1.5 mJ output energy and 66% energy throughput.

Published
2009
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