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15 октября 2016

Доклады лаборатории представлены на конференции Photonics Asia 2016

Результаты исследований лаборатории представлены на конференции Photonics Asia 2016 (12-14 октября 2016 г., Пекин, Китай):

Sergey M. Kobtsev, Sergey V. Smirnov, Alexey V. Ivanenko, Novosibirsk State Univ. (Russian Federation).
Fibre amplifying loop mirror with nonlinearity independent of the intensity of intra-cavity radiation.
Paper 10029-55
Among the demerits of standard nonlinear amplifying loop mirrors (NALM), one can single out the dependence of its reflectivity upon the intensity of the intra-cavity. This results in a relatively narrow range of radiation power, within which stable mode-locked operation of a fibre laser with NALM can be achieved. This work reports for the first time that in the process of generation, the NALM reflectivity may be controlled independently of the intra-cavity radiation power by using two different active media with independent pump sources. The newly proposed layout allows stable mode locking within a substantially broader radiation power range and enables achievement of record-high pulse parameters.

Sergey M. Kobtsev, Sergey V. Smirnov, Alexey V. Ivanenko, Novosibirsk State Univ. (Russian Federation).
RF spectral analysis for characterisation of mode-locked regimes in fibre lasers.
Paper 10019-50
In this work, we present our results of RF spectral analysis applied to mode-locked lasers and propose a method of qualitative assessment of mode-locked operation, which allows differentiation of individual generation regimes by a parameter calculated from RF spectra of the fundamental and the n-th radiation harmonics. The proposed parameter is derived both from the signal-to-noise ratio and from width and amount of additional noise present in RF spectrum of inter-mode beats at the fundamental pulse repetition frequency and its harmonic.

Daba A. Radnatarov, Novosibirsk State Univ. (Russian Federation); Sergey Khripunov, Novosibirsk State Univ (Russian Federation); Sergey M. Kobtsev, Novosibirsk State Univ. (Russian Federation); Alexey V. Taichenachev, Valeriy I. Yudin, Novosibirsk State Univ. (Russian Federation), Institute of Laser Physics SB RAS (Russian Federation); Maxim Y. Basalaev, Novosibirsk State Technical Univ. (Russian Federation); Ivan Popkov, Valerii Andryushkov, Tatiana Steschenko, Novosibirsk State Univ. (Russian Federation).
Feedback enhancement of the amplitude of dynamically excited coherent population trapping resonance in Rb vapour.
Paper 10029-56
For the first time, this work presents exploration of CPT resonance properties in 87Rb vapour with dynamic excitation using a feedback spectroscopy method (FSM). The present work demonstrates, for the first time, that application of the FSM to a system with dynamic CPT resonance excitation when the CPT resonance scan frequency exceeds 100 Hz also leads to a crucial enhancement (tens of times) of the resonance magnitude, which is similar to the enhancement obtained in the quasi-stationary mode. Our work presents the results obtained in study of the dependence of CPT resonance parameters upon the frequency at which it is scanned over the range of 1 Hz to 3 kHz, both with and without the feedback loop

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