Size effect of WSe₂on red passively Q-switched fiber laser output performance

Abstract

Transition metal dichalcogenides (TMDs) possess a direct bandgap in the visible frequency range and can be applied as attractive visible saturable absorbers (SAs). In this paper, a new TMDs tungsten selenide (WSe)-based red Q-switcher is fabricated and successfully used for Q-switched pulse generation in a red Pr-doped ZBLAN fiber laser. The passive Q-switching fiber laser at 635.2 nm generates a stable pulse with pulse duration of 504 ns and average output power of 4.91 mW as well as a tunable pulse repetition rate of 131.9-260.4 kHz. Furthermore, the size effect of WSe on the 635 nm passive Q-switching output performance is also investigated. Our work will provide certain significance for the optimization of passive Q-switching red fiber lasers based on TMDs.

Impact of Pauli-blocking effect on optical limiting properties of WSe2 thin films

“…In fact, the depth of modulation for pulse generation as well as shaping is directly proportional to |β| [57] and consequently, W Se 2 thin-films exhibiting strong Pauli-blocking induced SA behaviour would serve the purpose very efficiently. It has been demonstrated that stable high-energy nanosecond pulses could be generated by employing a few layer W Se 2 sheets (acting as saturable absorber) through passive Qswitching in P r 3+ -doped ZBLAN fiber laser emitting at 635 nm wavelength [58]. In a similar investigation, B. Chen et al have employed an arbitrarily thick W Se 2 film as a saturable absorber for generating Q-switched nanosecond pulses in erbium doped fiber laser [59].…”

A Tale of Two Tantalum Borides as Potential Saturable Absorbers for Q-Switched Fiber Lasers

“…In fact, their properties can be tailored by external voltage or stress and they exhibit strong spin-orbital coupling [28]. Transition metal dichalcogenides have been applied to different laser systems [29]- [34] from 635 nm to 3000 nm, with pulse durations from 500 ns to more than 2000 ns. Finally metal nano-particles (e.g., silver and gold) have also been used as saturable absorbers in fiber lasers [35], [36].…”