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Acousto-Optical Modulator

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Yuri O. Barmenkov – One of the best experts on this subject based on the ideXlab platform.

  • Nonlinear dynamics of Ytterbium-doped fiber laser Q-switched using Acousto-Optical Modulator
    The European Physical Journal Special Topics, 2014
    Co-Authors: Yuri O. Barmenkov, Alexander V. Kir'yanov, Miguel V. Andrés

    Abstract:

    A comprehensive experimental analysis of the dynamics of an ytterbium-doped fiber laser actively Q-switched (QS) using an intracavity Acousto-Optical Modulator (AOM) is presented. It is shown that type of QS pulsing strongly depends on AOM repetition rate and pump power. In particular, at low repetition rates, including zero-rate, and at relatively high pump powers peculiar QS pulsing, switched by stimulated Brillouin scattering (SBS), is established in the laser. The cause of such kind of pulsing is the SBS-process boosted by spurious narrow-line CW lasing that arises in auxiliary low-Q cavity formed by an output coupler (in our experiments — fiber Bragg gratings) and weak reflections from blocked AOM. The parameters’ area where this regime occurs is limited by certain values of pump power and AOM repetition rate. At increasing AOM repetition rate or decreasing pump power spurious CW lasing is not attained in the system; consequently, the SBS type of QS fades, while “conventional” QS (CQS) lasing is established in the system and remains. However CQS pulsing strongly suffers the nonlinear-dynamics effects: depending on AOM repetition rate and pump power the laser switches to common P1, P2, or P3 attractors, when QS pulses arise at sub-harmonics of AOM repetition rate, or to the specific transient regimes between them, or to chaotic operation. These and other sides (e.g. pulse jittering) of operation of the QS ytterbium-doped fiber laser with AOM are under scope of the present review as they have big interest for practical applications.

  • Pulsed Regimes of Erbium-Doped Fiber Laser Q-Switched Using Acousto-Optical Modulator
    IEEE Journal of Selected Topics in Quantum Electronics, 2014
    Co-Authors: Yuri O. Barmenkov, Alexander V. Kirryanov, Jose L. Cruz, Miguel V. Andrés

    Abstract:

    In this paper, we explore in details the operation regimes of an actively Q-switched erbium-doped fiber laser using a commercial Acousto-Optical Modulator (AOM) and demonstrate that these regimes essentially depend on whether or not continuous-wave (CW) narrow-line lasing develops in the intervals when AOM is blocked. If such spurious CW lasing exists it always starts up within auxiliary low-Q cavity formed by an output coupler and weak reflections from AOM while the area where it occurs is limited by certain values of an active fiber’s length and AOM’s repetition rate. In the absence of spurious CW lasing (when shorter active fibers are used), the laser operates in the regime of “common” Q-switching where the shape of pulses can be easily managed by a proper waveform of the signal controlling the AOM’s driver; pulse jittering in this regime is vastly negligible. In turn, when spurious CW lasing arises within the intervals when AOM is closed (this occurs at longer active fibers and at not too high AOM’s repetition rates), the laser operates in the regime of SBS-induced pulsing where short and powerful pulses are released; pulse jittering in this case is perceptible and depends on AOM’s repetition rate.

  • an experimental analysis of self q switching via stimulated brillouin scattering in an ytterbium doped fiber laser
    Laser Physics Letters, 2013
    Co-Authors: Yuri O. Barmenkov, A V Kiryanov, M V Andres

    Abstract:

    An experimental study of self-Q-switching (SQS) in an ytterbium doped fiber laser (YDFL) arranged using a twin-core GTWave assembly is reported. The main mechanisms that initiate, amplify, and limit SQS pulses in amplitude are revealed to be stimulated Brillouin and Raman scattering (SBS/SRS) and Yb3+ amplified spontaneous emission. The parameters featuring SQS oscillation in terms of efficiency and stability of pulsing are found to be intra-cavity loss and feedback strength. An analysis of the YDFL SQS regime?s features?pulsing time series, optical and RF spectra, amplitude and timing jitter?is provided for the two experimental situations: (i) when SQS pulsing stochastically intermits with regular active Q-switching pulses, given by the action of an intra-cavity Acousto-Optical Modulator, and (ii) when a pure SQS mode is intentionally implemented in the YDFL without a Modulator. The close relationship of the processes involved and SQS parameters in these two circumstances is demonstrated. Giant pulses with durations of 70?80?ns are shown to be generated at threshold intra-cavity powers of around 250?W (SBS threshold) and limited at approximately 2?kW of peak power (SRS threshold). At SBS-SQS, we show that at high values of intra-cavity loss, and thus reduced feedback, the amplitude and timing jitter values can be reduced to 5% and 7%, respectively.

Miguel V. Andrés – One of the best experts on this subject based on the ideXlab platform.

  • Nonlinear dynamics of Ytterbium-doped fiber laser Q-switched using Acousto-Optical Modulator
    The European Physical Journal Special Topics, 2014
    Co-Authors: Yuri O. Barmenkov, Alexander V. Kir'yanov, Miguel V. Andrés

    Abstract:

    A comprehensive experimental analysis of the dynamics of an ytterbium-doped fiber laser actively Q-switched (QS) using an intracavity Acousto-Optical Modulator (AOM) is presented. It is shown that type of QS pulsing strongly depends on AOM repetition rate and pump power. In particular, at low repetition rates, including zero-rate, and at relatively high pump powers peculiar QS pulsing, switched by stimulated Brillouin scattering (SBS), is established in the laser. The cause of such kind of pulsing is the SBS-process boosted by spurious narrow-line CW lasing that arises in auxiliary low-Q cavity formed by an output coupler (in our experiments — fiber Bragg gratings) and weak reflections from blocked AOM. The parameters’ area where this regime occurs is limited by certain values of pump power and AOM repetition rate. At increasing AOM repetition rate or decreasing pump power spurious CW lasing is not attained in the system; consequently, the SBS type of QS fades, while “conventional” QS (CQS) lasing is established in the system and remains. However CQS pulsing strongly suffers the nonlinear-dynamics effects: depending on AOM repetition rate and pump power the laser switches to common P1, P2, or P3 attractors, when QS pulses arise at sub-harmonics of AOM repetition rate, or to the specific transient regimes between them, or to chaotic operation. These and other sides (e.g. pulse jittering) of operation of the QS ytterbium-doped fiber laser with AOM are under scope of the present review as they have big interest for practical applications.

  • Pulsed Regimes of Erbium-Doped Fiber Laser Q-Switched Using Acousto-Optical Modulator
    IEEE Journal of Selected Topics in Quantum Electronics, 2014
    Co-Authors: Yuri O. Barmenkov, Alexander V. Kirryanov, Jose L. Cruz, Miguel V. Andrés

    Abstract:

    In this paper, we explore in details the operation regimes of an actively Q-switched erbium-doped fiber laser using a commercial Acousto-Optical Modulator (AOM) and demonstrate that these regimes essentially depend on whether or not continuous-wave (CW) narrow-line lasing develops in the intervals when AOM is blocked. If such spurious CW lasing exists it always starts up within auxiliary low-Q cavity formed by an output coupler and weak reflections from AOM while the area where it occurs is limited by certain values of an active fiber’s length and AOM’s repetition rate. In the absence of spurious CW lasing (when shorter active fibers are used), the laser operates in the regime of “common” Q-switching where the shape of pulses can be easily managed by a proper waveform of the signal controlling the AOM’s driver; pulse jittering in this regime is vastly negligible. In turn, when spurious CW lasing arises within the intervals when AOM is closed (this occurs at longer active fibers and at not too high AOM’s repetition rates), the laser operates in the regime of SBS-induced pulsing where short and powerful pulses are released; pulse jittering in this case is perceptible and depends on AOM’s repetition rate.

Chien-chang Chiu – One of the best experts on this subject based on the ideXlab platform.

  • High-efficiency Acousto-Optical interaction in phoxonic nanobeam waveguide
    Applied Physics Letters, 2012
    Co-Authors: Fu-li Hsiao, Cheng-yi Hsieh, Hao-yu Hsieh, Chien-chang Chiu

    Abstract:

    We demonstrate the simultaneous existence of slow photonic and phononic modes in phoxonic nanobeam. The phoxonic nanobeam is formed by arranging air semi-cylinders along lateral sides of a suspended silicon waveguide. Because of the slow group velocities, the Acousto-Optical interactions are dramatically enhanced. The efficiencies of interaction are strongly related to the polarizations of both slow photonic and phononic modes. Our proposed structure is a potential high-efficiency Acousto-Optical Modulator with ultra-small footprint size. The operating optical wavelength is about 1550 nm, while the acoustic frequency is about 6.8 GHz.