MOCCA Publications

Sergey Sergeyev, Stanislav Kolpakov, and Yury Loika
“Vector harmonic mode-locking by acoustic resonance”
Photonics Research, Volume 9, Issue 8, pp. 1432-1438 (2021);

For an Er-doped fiber laser, for the first time, to the best of our knowledge, authors demonstrate both experimentally and theoretically a novel mechanism of harmonic mode-locking based on the electrostriction effect leading to excitation of the torsional acoustic modes in the transverse section of the laser. The exited torsional acoustic modes modulate the fiber birefringence that results in synchronization of oscillations at the harmonic modes and the linewidth narrowing with the increased signal-to-noise ratio of 30 dB. By adjusting the in-cavity birefringence based on tuning the polarization controller, authors enable the selection of the harmonic mode to be stabilized..

The article can be read following this link


Misha Sumetsky and Victor Vassiliev
“Angstrom-precise fabrication of surface nanoscale axial photonics (SNAP) microresonators with a flame”
Laser Physics Letters, Volume 19, published 7 April 2022

Aston University team demonstrated the fabrication of surface nanoscale axial photonics bottle microresonators with angstrom precision using a flame. They observed strongly unscalable behavior of the whispering gallery mode cutoff wavelengths with different radial quantum numbers along the fibre length.

The article can be read following this link.

J. M. Chavez-Boggio, D. Bodenmüller, A. Baig, S. Ahmed, T. Hansson, F. Talenti, S. Wabnitz, D. Modotto
“Frequency comb generation in silicon nitride ring resonators with amplitude modulated pump”
Proc. SPIE 11672, Laser Resonators, Microresonators, and Beam Control XXIII, 1167206 (5 March 2021);

The article investigates frequency comb generation in silicon nitride ring resonators by using a pump subject to a weak amplitude modulation. It shows that a partial locking is obtained when the external modulation frequency differs from the resonator free-spectral-range by up to hundreds of MHz.

Keywords: Frequency comb, silicon nitride ring resonators, amplitude modulated pump, coherence.

The article can be read following this link


Gabriel Marty, Sylvain Combrié, Fabrice Raineri and Alfredo De Rossi
“Photonic crystal optical parametric oscillator”
Nature Photonics, 15, January 2021, pp. 53–58

Teams at Thales and C2N have developed a new miniaturized source of light called Photonic Crystal Optical Parametric Oscillator. An Optical Parametric Oscillator (OPO) is similar to a laser as it generates coherent light, namely photons having the same frequency, direction and polarization, except that here photons are emitted in pairs. These pairs are correlated, meaning that their perturbations (e.g. fluctuation of their frequency) are not independent. This property is exploited in many ways, in particular to decrease the noise in sensitive measurements (quantum sensing), to encode and encrypt information (quantum communication) and also to perform computing. More info.

The article can be read following this link.