L-band dual wavelength passively Q-switched erbium-doped fiber laser based on tellurium oxide nanoparticle saturable absorber

Abstract

We experimentally demonstrate a compact dual wavelength passive Q-switched fiber laser created by an erbium-doped fiber active medium using tellurium oxide nanoparticles (TeO 2 NPs) as a new saturable absorber (SA) material. The saturable absorption properties of the prepared TeO 2 -PVA thin film were systematically measured, and the modulation depth and saturation intensity were 8% and 90 MW cm −2 , respectively. By integrating the proposed SA in an all-fiber ring cavity, a dual wavelength laser with 1568.02 and 1569.09 nm wavelengths was observed without adding spectral filters or polarization maintaining fibers to control the suppression of the mode competition. A frequency difference of 0.13 THz was obtained located in the terahertz waveband. In the meantime, a stable Q-switched regime with a maximal pulse repetition rate of 45.7 kHz, a shortest pulse width of 2.69 µs and maximum pulse energy up to 39.4 nJ was attained at a maximum available pump power of 275 mW. The experimental setup using the TeO 2 NP SA represents a step forward in terahertz development and nonlinear optics.

Tunable S-band passively Q-switched thulium-doped fluoride fiber laser using Iron Phosphorus Trichalcogenide-PVA (FePS3-PVA) film

“…Numerous Q-switched fiber lasers have been shown spanning a broad wavelength range encompassing the C-band [14][15][16], L-band [17,18], 1.0 µm [19], and even 2.0 µm [20,21] regions. These were achieved by employing erbium dopedfibers (EDFs) [22], ytterbium doped-fibers [23], and thuliumdoped fibers [24] as gain mediums.…”

Dual-Wavelength Passively Q-Switched Erbium-Doped Fiber Laser Incorporating Calcium Carbonate Nanoparticles as Saturable Absorber

“…Tere are two techniques for implementing Q-switched lasers, active and passive [5]. Generally, the passive technique is favoured over the active technique as it ofers multiple advantages [6]. Tese include the ability to withstand harsh environments, ease of preparation, a smaller physical size, and the lack of a need for complex electronic circuits.…”

Single-Frequency Linearly-Polarization Q-Switched Nanosecond Fiber Ring-Cavity Laser Enabled by an Electro-Optic Modulator

“…P ULSED fiber lasers have garnered tremendous attention in recent years due to their applications like optical communications, materials processing, fiber sensing and spectroscopy [1], [2], [3], [4]. Fiber lasers have specific advantages compare to bulk optic counterparts related to their robust beam confinement, simple structure, easy integration, and environmental stability [5], [6].…”