Dr. Pasquale Maddaloni Profile

Dr. Pasquale Maddaloni

at Istituto Nazionale di Ottica

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Publications (8)

Proceedings Article | 8 April 2020 Presentation

Optical frequency combs in doubly resonant second harmonic generation (Conference Presentation)

Iolanda Ricciardi, Simona Mosca, Maria Parisi, Pasquale Maddaloni, Paolo De Natale, Miro Erkintalo, François Leo, Tobias Hansson, Ady Arie, Stefan Wabnitz, Maurizio De Rosa

Proceedings Volume 11358, 113580Y (2020) https://doi.org/10.1117/12.2553334

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We report on the experimental realization of optical frequency comb (OFC) generation in a doubly-resonant cavity second harmonic generation (SHG) system. OFCs continue to attract significant interest, offering a wealth of potential applications beyond frequency metrology. Continuously-driven Kerr microresonators, whose nonlinear response is dominated by the third-order nonlinearity, have proven to be viable alternatives to comb sources based on femtosecond mode-locked lasers. Recently, OFCs have also been directly generated through second-order nonlinear interactions in cw-pumped resonators namely, a singly-resonant cavity SHG system and a nearly-degenerate optical parametric oscillator. Theoretical studies have also predicted OFCs in doubly-resonant cavity SHG systems with a much lower threshold with respect to the singly-resonant configurations. Here we report on the first observations of OFCs in such a doubly-resonant system. The experiment is based on a periodically poled lithium niobate crystal, placed in a traveling-wave optical cavity, pumped by a cw Nd:YAG laser emitting 0.5 W at 1064 nm. The cavity is resonant for frequencies around both the fundamental pump and its second harmonic at 532 nm, and an intracavity adjustable silica window is used to separately set the detunings of the pump and its second harmonic. Stable cavity locking to the pump laser is achieved via the Pound-Drever-Hall offset locking technique, thanks to a counterpropagating orthogonally polarized auxiliary beam. We measured a power threshold for comb formation as low as 5 mW, reduced by more than one order of magnitude with respect to singly-resonant configurations. The locking system permitted to explore frequency detunings up to several cavity linewidths, and to correspondingly observe a large variety of comb regimes, with different teeth spacing and spectral span, as well as the contribution of photothermal effect to the whole dynamics. In this regard, we developed an extended theoretical model that includes thermo-optical nonlinearities.

Proceedings Article | 25 February 2020 Paper

A 1800-km optical fiber link for metrology, geodesy, and clock comparison

Mario Siciliani de Cumis, Cecilia Clivati, Luigi Santamaria Amato, Valentina Di Sarno, Anna Tampellini, Alberto Mura, Roberto Ricci, Federico Perini, Pasquale Maddaloni, Mauro Nanni, Roberto Ambrosini, Roberto Aiello, Claudio Bortolotti, Mauro Roma, Giuseppe Maccaferri, Matteo Stagni, Filippo Levi, Monia Negusini, Paolo De Natale, Giuseppe Bianco, Davide Calonico

Proceedings Volume 11296, 112961X (2020) https://doi.org/10.1117/12.2544970

KEYWORDS: Geodesy, Metrology, Optical fibers, Clocks, Hydrogen, Time metrology, Physics, Optical components, Optical spectroscopy, Radio telescopes

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Proceedings Article | 15 February 2018 Paper

Frequency comb generation in a continuously pumped optical parametric oscillator

S. Mosca, M. Parisi, I. Ricciardi, F. Leo, T. Hansson, M. Erkintalo, P. Maddaloni, P. De Natale, S. Wabnitz, M. De Rosa

Proceedings Volume 10516, 1051608 (2018) https://doi.org/10.1117/12.2290798

KEYWORDS: Optical parametric oscillators, Frequency combs, Numerical simulations, Mirrors, Nonlinear crystals, Second-harmonic generation, Visible radiation, Crystals, Modulation, Picosecond phenomena

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Proceedings Article | 21 November 2017 Open Access

Comb-referenced ultra-high sensitivity spectroscopic molecular detection by compact non-linear sources

P. Cancio, G. Gagliardi, I. Galli, G. Giusfredi, P. Maddaloni, P. Malara, D. Mazzotti, P. De Natale

Proceedings Volume 10567, 105672Y (2017) https://doi.org/10.1117/12.2308163

KEYWORDS: Spectroscopy, Crystals, Molecular spectroscopy, Optical resonators, Absorption, Mirrors, Mid-IR, Laser sources, Nonlinear crystals, Infrared radiation

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Proceedings Article | 11 May 2012 Paper

A narrow-linewidth, frequency-stabilized OPO for sub-Doppler molecular spectroscopy around 3 um

Iolanda Ricciardi, Eduardo De Tommasi, Pasquale Maddaloni, Simona Mosca, Alessandra Rocco, Jean-Jacques Zondy, Maurizio De Rosa, Paolo De Natale

Proceedings Volume 8434, 84341Z (2012) https://doi.org/10.1117/12.960334

KEYWORDS: Optical parametric oscillators, Spectroscopy, Mirrors, Signal detection, Interference (communication), Frequency combs, Mode locking, Laser stabilization, Beam splitters, Nonlinear optics

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Proceedings Article | 27 August 2008 Paper

Ultra-high sensitivity frequency-comb-referenced multi-parametric sensors based on 1-D photonic components

G. Gagliardi, P. Maddaloni, P. Malara, M. Salza, P. Ferraro, P. De Natale

Proceedings Volume 7056, 70560I (2008) https://doi.org/10.1117/12.795015

KEYWORDS: Sensors, Crystals, Teeth, Fiber Bragg gratings, Spectroscopy, Semiconductor lasers, Oscillators, Nonlinear crystals, Near infrared, Servomechanisms

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Proceedings Article | 15 September 2004 Paper

High-sensitivity and high-resolution trace gas detection by means of a mW-power DFG spectrometer around 3.2 µm

Pasquale Maddaloni, Gianluca Gagliardi, Paolo Malara, Paolo De Natale

Proceedings Volume 5547, (2004) https://doi.org/10.1117/12.559550

KEYWORDS: Spectroscopy, Crystals, Sensors, Methane, Laser crystals, Absorption spectroscopy, Beam splitters, Environmental monitoring, Absorption, Nitrogen

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Proceedings Article | 17 August 2004 Paper

Thickness measurement of thin transparent plates with a broadband wavelength-scanning interferometer

Pasquale Maddaloni, Giuseppe Coppola, Paolo de Natale, Sergio de Nicola, Pietro Ferraro, Mariano Gioffre, Mario Iodice

Proceedings Volume 5458, (2004) https://doi.org/10.1117/12.544955

KEYWORDS: Refractive index, Interferometers, Silicon, Laser sources, Interferometry, Statistical analysis, Silica, Collimation, Fringe analysis, CCD cameras

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Showing 5 of 8 publications

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