2 µm actively Q-switched all fiber laser based on stress-induced birefringence and commercial Tm-doped silica fiber

Fu, Shijie; Sheng, Quan; Shi, Wei; Tian, Xueping; Fang, Qiang; Yao, Jianquan

doi:10.1016/j.optlastec.2015.01.008

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…Despite this, there is ongoing research and development of new promising materials to create real all-fiber modulators, as well as various methods of Q-switching being investigated. In [43], an actively Q-switched all-fiber thulium laser at a wavelength of 1920 nm was experimentally demonstrated. The Q-switching was realized by polarization modulation through the stress-induced birefringence using a piezoelectric transducer (PZT) as the Q-switcher.…”

Section: Discussionmentioning

confidence: 99%

The Dynamics of Multi-Peak Pulsed Generation in a Q-Switched Thulium-Doped Fiber Laser

et al. 2022

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We demonstrate a detailed theoretical and experimental study of a thulium-doped fiber laser being Q-switched by means of an acousto-optic modulator. The processes leading to the generation of discontinuous multi-peak pulses with an energy of up to 5 μJ and a nanosecond structure are described. The dynamics of the multi-peak structure’s evolution is demonstrated and a method of switching to a single-pulse mode is proposed.

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Section: Discussionmentioning

confidence: 99%

The Dynamics of Multi-Peak Pulsed Generation in a Q-Switched Thulium-Doped Fiber Laser

et al. 2022

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“…Owing to an increasing need for laser pulses in widespread applications including medicine, micromachining and manufacturing, a huge amount of attention has been paid to pulsed laser techniques [1][2][3][4][5][6][7][8][9][10][11][12]. Pumping the population inversion to a value far in excess of the threshold population and then suddenly switching the cavity Q factor from a low to a high value allows the generation of laser pulses with a duration from a few nanoseconds to a few tens of nanoseconds.…”

Section: Introductionmentioning

confidence: 99%

“…Q-switching and gain switching are the two principle approaches for nanosecond pulse generation [17]. To produce a laser pulse both the Q-switching and gain switching must undergo two processes: (1) the absorption process, where the population in the upper laser level keeps growing while the stimulated emission is absent; (2) stimulated emission process, where the absorption is much weaker than the stimulated emission and the population inversion keeps decreasing. Those two techniques have the same pulsing mechanism, which is based on the nonequilibrium between the absorption and stimulated emission.…”

Section: Introductionmentioning

confidence: 99%

Pulsing mechanism based on power adiabatic evolution of pump in Tm-doped fiber laser

Wang¹

2019

Laser Phys.

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We prove an alternative pulsing mechanism based on power adiabatic evolution of pump in Tm-doped fiber laser. A pulsed laser technique, unlike Qswitching and gain-switching, is explored under the equilibrium between the stimulated emission and absorption. After the laser reaching a CW steady state, the temporal fluctuation of pump power is called power adiabatic evolution if it does not break the balance between the stimulated emission and the absorption. Under the pump power adiabatic evolution the population densities in the upper and lower laser levels get clamped to their steady-state values, and the temporal shape of output laser is identical with that of pump. Based on the power adiabatic evolution of pump a laser pulse can therefore be generated by a pulsed pump which is added to a CW pump. Moreover, the temporal profile, duration and peak power of the laser pulse can all be precisely controlled. Power adiabatic evolution of pump can be achieved in the three pumping shemes of Tm-doped fiber laser, provided that the duration of pump pulse is broader than a certain value. The study on the pulsing mechanism highlights an alternative pulsed technique possessing several advantages over Q-switching and gain-switching.

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“…The 2 μm window is estimated to cover the range from 1800 nm to 2100 nm which is about 300 nm bandwidth [7,8]. TDFL has attracted various applications including medical, light and range detection (LIDAR) [7], military and defense [9], gas remote sensing [10] and also the optical communication due to its ability to emit at 2 μm region [11]. Ultrafast fiber laser [12,13] is an ultimate invention in the revolution of high power laser.…”

Section: Introductionmentioning

confidence: 99%

Generation of Q-Switched Thulium-Doped Fiber Laser (Tdfl) Using Differentsaturable Absorbers

et al. 2016

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A Q-switched Thulium-doped Fiber Laser (TDFL) operating at approximately 2 μm wavelength is successfully generated by using four different saturable absorbers (SAs) which are nitrogen-doped graphene in PVA (NG:PVA), nitrogen-doped graphene in PEO (NG:PEO), single-walled carbon nanotube in PVA (SWCNT:PVA), and high pressure carbon monoxide carbon nanotube in PVA (CNTHiPCO:PVA). The SAs integrated in the cavity were able to provide the real saturable absorption in modulating the intra-cavity losses. SWCNT gives the best results with the highest repetition rate and lowest pulse width of 57.45 kHz and 1.958 nJ correspondingly as compared to the other three SAs.

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2 µm actively Q-switched all fiber laser based on stress-induced birefringence and commercial Tm-doped silica fiber

Cited by 8 publications

References 16 publications

The Dynamics of Multi-Peak Pulsed Generation in a Q-Switched Thulium-Doped Fiber Laser

The Dynamics of Multi-Peak Pulsed Generation in a Q-Switched Thulium-Doped Fiber Laser

Pulsing mechanism based on power adiabatic evolution of pump in Tm-doped fiber laser

Generation of Q-Switched Thulium-Doped Fiber Laser (Tdfl) Using Differentsaturable Absorbers

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