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Papers by Cyril Drag
Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170), 2001
ABSTRACT Summary form only given. With the appearance of periodically poled crystals, tremendous ... more ABSTRACT Summary form only given. With the appearance of periodically poled crystals, tremendous developments were recently obtained in the field of continuous-wave (cw) optical parametric oscillators. However, the low power delivered by cw sources is not appropriate to address the problems of nonlinear spectroscopy and open air pollutant species detection. Pulsed OPOs seem to be a good alternative for such applications since high output power can be delivered over a large domain of wavelengths from rugged and compact devices. Nonetheless, the broad spectral bandwidth of nanosecond-duration pulsed OPO remains a serious drawback for spectroscopic purposes. In this paper, we propose a new alternative, based on a dual-cavity doubly resonant OPO (DROPO).Using two separate cavities allows us to prevent oscillation with imperfect mode overlap
Continuous-wave active mode-locking of near degenerate singly and doubly resonant OPOs is reporte... more Continuous-wave active mode-locking of near degenerate singly and doubly resonant OPOs is reported. Transient and steady-state regimes are explored.
Physical Review Letters, 1999
Long-range interactions can substantially modify collision or interaction processes among cold at... more Long-range interactions can substantially modify collision or interaction processes among cold atoms. We are able to monitor their effects on two different systems: Cs atoms which undergo photoassociation and highly excited Cs Rydberg atoms. Although the length and ...
Optics Letters, 2015
We report on the first experimental investigation of the spectral dynamics of a synchronously pum... more We report on the first experimental investigation of the spectral dynamics of a synchronously pumped optical parametric oscillator (OPO) by use of dispersive Fourier transformation. For standard pumping rates, we observe a reproducible steady-state pulse-to-pulse spectrum. However, at high pumping levels, the OPO delivers pulse trains with nontrivial oscillatory spectral patterns. So as to benefit from a tailored broadband gain spectrum, the investigated OPO contains a chirped quasi-phase matching (QPM) nonlinear crystal. We explore the specific impacts of using such a remarkable parametric amplification medium where nonlinearly coupled frequencies vary with position. Depending on the QPM chirp rate sign, a red-or blue-shift of the emitted wavelength occurs when the OPO is switched on, leading to different spectral steady-states. These singular spectrotemporal dynamics are evidenced and explained for the first time.
Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest (IEEE Cat. No.01CH37170), 2001
ABSTRACT Summary form only given. With the appearance of periodically poled crystals, tremendous ... more ABSTRACT Summary form only given. With the appearance of periodically poled crystals, tremendous developments were recently obtained in the field of continuous-wave (cw) optical parametric oscillators. However, the low power delivered by cw sources is not appropriate to address the problems of nonlinear spectroscopy and open air pollutant species detection. Pulsed OPOs seem to be a good alternative for such applications since high output power can be delivered over a large domain of wavelengths from rugged and compact devices. Nonetheless, the broad spectral bandwidth of nanosecond-duration pulsed OPO remains a serious drawback for spectroscopic purposes. In this paper, we propose a new alternative, based on a dual-cavity doubly resonant OPO (DROPO).Using two separate cavities allows us to prevent oscillation with imperfect mode overlap
Continuous-wave active mode-locking of near degenerate singly and doubly resonant OPOs is reporte... more Continuous-wave active mode-locking of near degenerate singly and doubly resonant OPOs is reported. Transient and steady-state regimes are explored.
Physical Review Letters, 1999
Long-range interactions can substantially modify collision or interaction processes among cold at... more Long-range interactions can substantially modify collision or interaction processes among cold atoms. We are able to monitor their effects on two different systems: Cs atoms which undergo photoassociation and highly excited Cs Rydberg atoms. Although the length and ...
Optics Letters, 2015
We report on the first experimental investigation of the spectral dynamics of a synchronously pum... more We report on the first experimental investigation of the spectral dynamics of a synchronously pumped optical parametric oscillator (OPO) by use of dispersive Fourier transformation. For standard pumping rates, we observe a reproducible steady-state pulse-to-pulse spectrum. However, at high pumping levels, the OPO delivers pulse trains with nontrivial oscillatory spectral patterns. So as to benefit from a tailored broadband gain spectrum, the investigated OPO contains a chirped quasi-phase matching (QPM) nonlinear crystal. We explore the specific impacts of using such a remarkable parametric amplification medium where nonlinearly coupled frequencies vary with position. Depending on the QPM chirp rate sign, a red-or blue-shift of the emitted wavelength occurs when the OPO is switched on, leading to different spectral steady-states. These singular spectrotemporal dynamics are evidenced and explained for the first time.