Q-switched and mode-locked pulses generation in Nd:GdVO₄ laser with dual loss-modulation mechanism

Abstract

Regular and robust Q-switched and mode-locked (QML) pulses are produced in Nd:GdVO4 laser by the integration of nonlinear mirror and semiconductor saturable absorber mirror. The threshold of QML operation is increased by putting the SESAM in laser cavity with large beam radius. The nonlinear mirror absorber can further increase nonlinear loss modulation of pulses to produce the stable and periodic QML pulses.

High-quality and Large-size Topological Insulator Bi2Te3-Gold Saturable Absorber Mirror for Mode-Locking Fiber Laser

“…4(a), respectively. Except for 2.66 μs one, the results reveal the repetition rates of QS envelope increases, and envelope width of the QS-ML pulses and pulse width of ML pulses decreases as increasing the coupling efficiency (increasing intracavity power), which are inherent characteristics38. Since the 2.66 μs QS-ML is in the intermediate state to completely ML state against the QS-ML, the QS modulation becomes weakened35.…”

“…For passively MLFLs, a saturable absorber (SA) is indispensable in shaping the pulses in the temporal domain2. Among the various types of SAs, semiconductor saturable absorber mirror (SESAM)13, single-wall carbon nanotubes (SWCNTs)45678, and graphene910111213 were intensively used in various MLFL schemes. Although SESAMs have been mostly used in laser resonators to generate mode-locked laser pulses, they are expensive, complicated in fabrication processes (e.g., grown on lattice-matched semiconductor substrates with high quality distributed Bragg reflector mirror), and narrow in wavelength tuning range (typically a few tens of nanometers)1.…”

Diode-pumped actively Q-switching and mode-locking Nd:GdVO4laser

“…Nd:GdVO 4 crystal, as an isomorph of Nd:YVO 4 , has been confirmed to be a promising laser medium for diode pumping [2][3][4][10][11][12][13][14][15]. As compared with [2,[12][13][14].…”

Actively Q-switched mode-locked Yb-doped fiber laser with high mode-locking contrast

“…For example, by carefully adjusting the rear mirror posi tion in an EDFL with an AOM, Myslinski et al have shown that QML pulses can be generated through the mode beating and the nonlinear self phase modula tion [30,31]. In diode pumped all solid state lasers (DPSSL), QML lasers have also been widely reported by a passive or active modulator [32][33][34][35].…”