Tunable Q-switched thulium-doped fiber laser (TDFL) in 2.0 µm region based on gallium selenide saturable absorber

Solution‐Processed GaSe Nanoflake‐Based Films for Photoelectrochemical Water Splitting and Photoelectrochemical‐Type Photodetectors

“…Due to its structure, GaSe shows fascinating optoelectronic properties, including photoresponse in ultraviolet–visible (UV–vis) spectral range (from 1.8 to 5 eV), nonlinear optical behavior, and a distinctive spin physics (e.g., spin‐orbit coupling effects and generation/retention of spin polarization under nonresonant optical pumping). For the aforementioned properties, GaSe has been proposed for photodetectors with high responsivity (e.g., up to values > 1000 A W −1 at light intensity ≤ 0.1 mW cm −2 , in heterojunction with graphene), nonlinear frequency generation (e.g., second and third harmonic and ultrabroadband radiation generation), spin polarization control (e.g., spintronic logic devices), light‐emitting devices, optical microcavities, and saturable absorbers . Moreover, the number of layers and strain engineering strongly affect the GaSe optoelectronic properties, which can be on‐demand tailored to fulfill the requirements of the final applications .…”

155 nm-wideband and tunable q-switched fiber laser using an MXene Ti3C2TX coated microfiber based saturable absorber

“…The radio-frequency spectrum with a resolution bandwidth (RBW) of 30 Hz and span of 80 kHz is shown in figure 5(d). A sharp and clean peak at 59 kHz is observed with an SNR of approximately 52 dB which is comparable to [49][50][51] and in some cases even higher [52][53][54] than the SNR values obtained in passively Q-switched TFDLs cavities using different SAs. This verifies the highly stable nature of the Q-switching operation in the TDFL.…”

Stable Multi-Wavelength Thulium-Doped Fiber Laser With Two Cascaded Single-Mode-Four-Mode-Single-Mode Fiber Interferometers

“…Various multi-wavelength thulium-doped fiber lasers (MWTDFLs) have been widely studied, such as the modelocked fiber laser [3,4], Q-switched fiber laser [5,6], and narrow linewidth fiber laser [7][8][9]. Accordingly, the development of MWTDFLs using new filters or novel structures have been successfully exploited, such as all-fiber Mach-Zehnder interferometer [10], fiber-based Lyot filter [11], high birefringence fiber in a fiber optical loop mirror [12], polarization-maintaining sampled fiber Bragg grating [13,14], coupled fiber Bragg grating cavities [15], and polarization-dependent narrow-band filter [16].…”