Research output: Contribution to journal › Review article › peer-review
Optical frequency combs in quadratically nonlinear resonators. / Ricciardi, Iolanda; Mosca, Simona; Parisi, Maria et al.
In: Micromachines, Vol. 11, No. 2, 230, 24.02.2020, p. 1-22.Research output: Contribution to journal › Review article › peer-review
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TY - JOUR
T1 - Optical frequency combs in quadratically nonlinear resonators
AU - Ricciardi, Iolanda
AU - Mosca, Simona
AU - Parisi, Maria
AU - Leo, François
AU - Hansson, Tobias
AU - Erkintalo, Miro
AU - Maddaloni, Pasquale
AU - De Natale, Paolo
AU - Wabnitz, Stefan
AU - De Rosa, Maurizio
N1 - Publisher Copyright: © 2020 by the authors.
PY - 2020/2/24
Y1 - 2020/2/24
N2 - Optical frequency combs are one of the most remarkable inventions in recent decades. Originally conceived as the spectral counterpart of the train of short pulses emitted by mode-locked lasers, frequency combs have also been subsequently generated in continuously pumped microresonators, through third-order parametric processes. Quite recently, direct generation of optical frequency combs has been demonstrated in continuous-wave laser-pumped optical resonators with a second-order nonlinear medium inside. Here, we present a concise introduction to such quadratic combs and the physical mechanism that underlies their formation. We mainly review our recent experimental and theoretical work on formation and dynamics of quadratic frequency combs. We experimentally demonstrated comb generation in two configurations: a cavity for second harmonic generation, where combs are generated both around the pump frequency and its second harmonic and a degenerate optical parametric oscillator, where combs are generated around the pump frequency and its subharmonic. The experiments have been supported by a thorough theoretical analysis, aimed at modelling the dynamics of quadratic combs, both in frequency and time domains, providing useful insights into the physics of this new class of optical frequency comb synthesizers. Quadratic combs establish a new class of efficient frequency comb synthesizers, with unique features, which could enable straightforward access to new spectral regions and stimulate novel applications.
AB - Optical frequency combs are one of the most remarkable inventions in recent decades. Originally conceived as the spectral counterpart of the train of short pulses emitted by mode-locked lasers, frequency combs have also been subsequently generated in continuously pumped microresonators, through third-order parametric processes. Quite recently, direct generation of optical frequency combs has been demonstrated in continuous-wave laser-pumped optical resonators with a second-order nonlinear medium inside. Here, we present a concise introduction to such quadratic combs and the physical mechanism that underlies their formation. We mainly review our recent experimental and theoretical work on formation and dynamics of quadratic frequency combs. We experimentally demonstrated comb generation in two configurations: a cavity for second harmonic generation, where combs are generated both around the pump frequency and its second harmonic and a degenerate optical parametric oscillator, where combs are generated around the pump frequency and its subharmonic. The experiments have been supported by a thorough theoretical analysis, aimed at modelling the dynamics of quadratic combs, both in frequency and time domains, providing useful insights into the physics of this new class of optical frequency comb synthesizers. Quadratic combs establish a new class of efficient frequency comb synthesizers, with unique features, which could enable straightforward access to new spectral regions and stimulate novel applications.
KW - Modulation instability
KW - Optical frequency combs
KW - Optical parametric oscillator
KW - Quadratic nonlinearity
KW - Second harmonic generation
KW - NOBEL LECTURE
KW - LASER
KW - POWER
KW - PHASE
KW - SOLITONS
KW - MODULATION INSTABILITY
KW - SPECTROSCOPY
KW - optical parametric oscillator
KW - second harmonic generation
KW - PARAMETRIC OSCILLATION
KW - optical frequency combs
KW - modulation instability
KW - 2ND-HARMONIC GENERATION
KW - quadratic nonlinearity
KW - MICRORESONATORS
UR - http://www.scopus.com/inward/record.url?scp=85081161815&partnerID=8YFLogxK
U2 - 10.3390/mi11020230
DO - 10.3390/mi11020230
M3 - Review article
C2 - 32102284
AN - SCOPUS:85081161815
VL - 11
SP - 1
EP - 22
JO - Micromachines
JF - Micromachines
SN - 2072-666X
IS - 2
M1 - 230
ER -
ID: 23739958