Q Switching

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Lixin Xu - One of the best experts on this subject based on the ideXlab platform.

  • Q Switching fiber laser based on carbon nano tube for cylindrical vector beams generation
    Journal of Optics, 2017
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Anting Wang, Qiwen Zhan
    Abstract:

    An all fiber passive Q-Switching laser with cylindrical-vector beam (CVB) output was demonstrated for the first time to the best of our knowledge using carbon nano-tube (CNT) as saturable absorber and a few-mode fiber Bragg grating as polarization-selective output coupler. The fiber laser operated at the wavelength of 1557.5 nm with a narrow linewidth of less than 0.02 nm (3 dB). Attributed to the high damage threshold and polarization insensitivity of the CNT, the Q-Switching fiber laser was capable of generating switchable radially or azimuthally polarized output modes. When the pump power varied from 63.09 to 162.63 mW the repetition rate of the Q-Switching CVB fiber laser increased three times from 30.88 to 92.75 kHz.

  • tungsten disulphide based all fiber Q Switching cylindrical vector beam generation
    Applied Physics Letters, 2015
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Qiwen Zhan
    Abstract:

    We proposed and demonstrated an all fiber passively Q-Switching laser to generate cylindrical-vector beam, a two dimensional material, tungsten disulphide (WS2), was adopted as a saturable absorber inside the laser cavity, while a few-mode fiber Bragg grating was used as a transverse mode-selective output coupler. The repetition rate of the Q-Switching output pulses can be varied from 80 kHz to 120 kHz with a shortest duration of 958 ns. Attributed to the high damage threshold and polarization insensitivity of the WS2 based saturable absorber, the radially polarized beam and azimuthally polarized beam can be easily generated in the Q-Switching fiber laser.

  • wavelength tunable yb doped passively Q Switching fiber laser based on ws 2 saturable absorber
    Optics Express, 2015
    Co-Authors: Yangyang Hu, Chun Gu, Changjia Chen, Lixin Xu
    Abstract:

    We have fabricated an Yb-doped passively Q-Switching fiber laser based on WS2 saturable absorber. Both the operating wavelength and the repetition rate can be tuned in a wide range. The operating wavelength can be continuously tuned from 1027 nm to 1065 nm under the Q-Switching state at a fixed pump power, while the repetition rate increases from 60.2 kHz to 97.0 kHz by varying pump power at a fixed wavelength of 1048.1 nm. The shortest pulse duration of 1.58 µs was observed. To the best of our knowledge, it’s the first demonstration of WS2-based passively Q-Switching fiber laser with a wide tunable range at 1.0 μm band.

Chun Gu - One of the best experts on this subject based on the ideXlab platform.

  • Q Switching fiber laser based on carbon nano tube for cylindrical vector beams generation
    Journal of Optics, 2017
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Anting Wang, Qiwen Zhan
    Abstract:

    An all fiber passive Q-Switching laser with cylindrical-vector beam (CVB) output was demonstrated for the first time to the best of our knowledge using carbon nano-tube (CNT) as saturable absorber and a few-mode fiber Bragg grating as polarization-selective output coupler. The fiber laser operated at the wavelength of 1557.5 nm with a narrow linewidth of less than 0.02 nm (3 dB). Attributed to the high damage threshold and polarization insensitivity of the CNT, the Q-Switching fiber laser was capable of generating switchable radially or azimuthally polarized output modes. When the pump power varied from 63.09 to 162.63 mW the repetition rate of the Q-Switching CVB fiber laser increased three times from 30.88 to 92.75 kHz.

  • tungsten disulphide based all fiber Q Switching cylindrical vector beam generation
    Applied Physics Letters, 2015
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Qiwen Zhan
    Abstract:

    We proposed and demonstrated an all fiber passively Q-Switching laser to generate cylindrical-vector beam, a two dimensional material, tungsten disulphide (WS2), was adopted as a saturable absorber inside the laser cavity, while a few-mode fiber Bragg grating was used as a transverse mode-selective output coupler. The repetition rate of the Q-Switching output pulses can be varied from 80 kHz to 120 kHz with a shortest duration of 958 ns. Attributed to the high damage threshold and polarization insensitivity of the WS2 based saturable absorber, the radially polarized beam and azimuthally polarized beam can be easily generated in the Q-Switching fiber laser.

  • wavelength tunable yb doped passively Q Switching fiber laser based on ws 2 saturable absorber
    Optics Express, 2015
    Co-Authors: Yangyang Hu, Chun Gu, Changjia Chen, Lixin Xu
    Abstract:

    We have fabricated an Yb-doped passively Q-Switching fiber laser based on WS2 saturable absorber. Both the operating wavelength and the repetition rate can be tuned in a wide range. The operating wavelength can be continuously tuned from 1027 nm to 1065 nm under the Q-Switching state at a fixed pump power, while the repetition rate increases from 60.2 kHz to 97.0 kHz by varying pump power at a fixed wavelength of 1048.1 nm. The shortest pulse duration of 1.58 µs was observed. To the best of our knowledge, it’s the first demonstration of WS2-based passively Q-Switching fiber laser with a wide tunable range at 1.0 μm band.

Qiwen Zhan - One of the best experts on this subject based on the ideXlab platform.

  • Q Switching fiber laser based on carbon nano tube for cylindrical vector beams generation
    Journal of Optics, 2017
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Anting Wang, Qiwen Zhan
    Abstract:

    An all fiber passive Q-Switching laser with cylindrical-vector beam (CVB) output was demonstrated for the first time to the best of our knowledge using carbon nano-tube (CNT) as saturable absorber and a few-mode fiber Bragg grating as polarization-selective output coupler. The fiber laser operated at the wavelength of 1557.5 nm with a narrow linewidth of less than 0.02 nm (3 dB). Attributed to the high damage threshold and polarization insensitivity of the CNT, the Q-Switching fiber laser was capable of generating switchable radially or azimuthally polarized output modes. When the pump power varied from 63.09 to 162.63 mW the repetition rate of the Q-Switching CVB fiber laser increased three times from 30.88 to 92.75 kHz.

  • tungsten disulphide based all fiber Q Switching cylindrical vector beam generation
    Applied Physics Letters, 2015
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Qiwen Zhan
    Abstract:

    We proposed and demonstrated an all fiber passively Q-Switching laser to generate cylindrical-vector beam, a two dimensional material, tungsten disulphide (WS2), was adopted as a saturable absorber inside the laser cavity, while a few-mode fiber Bragg grating was used as a transverse mode-selective output coupler. The repetition rate of the Q-Switching output pulses can be varied from 80 kHz to 120 kHz with a shortest duration of 958 ns. Attributed to the high damage threshold and polarization insensitivity of the WS2 based saturable absorber, the radially polarized beam and azimuthally polarized beam can be easily generated in the Q-Switching fiber laser.

M.v. Andres - One of the best experts on this subject based on the ideXlab platform.

  • dual kind Q Switching of erbium fiber laser
    Applied Physics Letters, 2014
    Co-Authors: Yuri O Barmenkov, A V Kiryanov, J.l. Cruz, M.v. Andres
    Abstract:

    Two different regimes of Q-Switching in the same implementation of an actively Q-switched erbium-doped fiber laser are demonstrated. Depending on the active fiber length and repetition rate of an intracavity Q-cell (acousto-optic modulator), the laser operates either in the regime of common, rather long and low-power, pulses composed of several sub-pulses or in the one of very short and powerful stimulated Brillouin scattering-induced pulses. The basic physical reason of the laser system to oscillate in one of these two regimes is the existence or absence of CW narrow-line “bad-cavity” lasing in the intervals when the Q-cell is blocked.

  • smart Q Switching for single pulse generation in an erbium doped fiber laser
    Optics Express, 2012
    Co-Authors: Luis Escalantezarate, Yuri O Barmenkov, J.l. Cruz, Stanislav A Kolpakov, M.v. Andres
    Abstract:

    In this paper, we report an active Q-Switching of an erbium-doped fiber laser with special modulation functions and novel laser geometry. We experimentally demonstrate that using such a smart Q-switch approach, Q-switch ripple-free pulses with Gaussian-like shape and 17.3 ns width can be easily obtained. The idea behind the smart Q-switch is to suppress one of two laser waves contra-propagating along the fiber cavity, which arises after Q-cell opening, and to eliminate the minor sub-pulses.

  • Q Switching of an all fiber laser by acousto optic modulation of a fiber bragg grating
    Optics Express, 2006
    Co-Authors: M Delgadopinar, D. Zalvidea, A. Diez, P Perezmillan, M.v. Andres
    Abstract:

    We report active Q-Switching of an all-fiber laser using a Bragg grating based acousto-optic modulator. Q-Switching is performed by modulating a fiber Bragg grating with an extensional acoustic wave. The acoustic wave modulates periodically the effective index profile of the FBG and changes its reflection features. This allows controlling the Q-factor of the cavity. Using 1 m of 300 ppm erbium-doped fiber and a maximum pump power of 180 mW, Q-switch pulses of 10 W of peak power and 82 ns wide were generated. The pulse repetition rate of the laser can be continuously varied from few Hz up to 62.5 kHz.

  • All-fibre lasers: active Q-Switching techniQues
    Proceedings of 2005 7th International Conference Transparent Optical Networks 2005., 2005
    Co-Authors: M.v. Andres, J.l. Cruz, A. Diez, P. Perez-millan, M. Delgado-pinar, R. Duchowicz, D. Zalvidea, N.a. Russo
    Abstract:

    All-fibre lasers are important in the development of telecommunication systems. The modulation techniQues based on all-fibre components permit to obtain new compact and robust laser configurations. Interesting results on new Q-Switching and lambda-Switching techniQues have been obtained. Q-switched distributed feedback fibre-lasers exhibit a narrow bandwidth below 0.4 pm and peak powers the order of 300 mW.

Yong Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Q Switching fiber laser based on carbon nano tube for cylindrical vector beams generation
    Journal of Optics, 2017
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Anting Wang, Qiwen Zhan
    Abstract:

    An all fiber passive Q-Switching laser with cylindrical-vector beam (CVB) output was demonstrated for the first time to the best of our knowledge using carbon nano-tube (CNT) as saturable absorber and a few-mode fiber Bragg grating as polarization-selective output coupler. The fiber laser operated at the wavelength of 1557.5 nm with a narrow linewidth of less than 0.02 nm (3 dB). Attributed to the high damage threshold and polarization insensitivity of the CNT, the Q-Switching fiber laser was capable of generating switchable radially or azimuthally polarized output modes. When the pump power varied from 63.09 to 162.63 mW the repetition rate of the Q-Switching CVB fiber laser increased three times from 30.88 to 92.75 kHz.

  • tungsten disulphide based all fiber Q Switching cylindrical vector beam generation
    Applied Physics Letters, 2015
    Co-Authors: Yong Zhou, Lixin Xu, Chun Gu, Qiwen Zhan
    Abstract:

    We proposed and demonstrated an all fiber passively Q-Switching laser to generate cylindrical-vector beam, a two dimensional material, tungsten disulphide (WS2), was adopted as a saturable absorber inside the laser cavity, while a few-mode fiber Bragg grating was used as a transverse mode-selective output coupler. The repetition rate of the Q-Switching output pulses can be varied from 80 kHz to 120 kHz with a shortest duration of 958 ns. Attributed to the high damage threshold and polarization insensitivity of the WS2 based saturable absorber, the radially polarized beam and azimuthally polarized beam can be easily generated in the Q-Switching fiber laser.