Using a few-layer black phosphorus (BP) thin film that acts as saturable absorber (SA) in an ytterbium-doped fiber laser setup, we experimentally demonstrated passively dual-wavelength Q-switching operation. The setup also incorporated D-shaped polished wavelength selective filter. As the SA was used ring cavity, Q-switch produced consistent outputs at 1038.68 and 1042.05 nm. A maximum pulse energy of 2.09 nJ with shortest width 1.16 µs measured for achieved pulses. In addition, repetition...

In this article, we present a vibration measurement system based on low-frequency cantilever-based fiber Bragg grating accelerometers (CFAs) for suspension bridge. Each accelerometer has an end-loaded cantilever beam, specifically tailored to achieve uniform sensitivity frequency range of 0-4 Hz, suitable detection the analysis. field test, seven CFAs were installed at specific positions along deck 110-m-long bridge synchronous multipoint measurements. The reflection spectra CFA array...

A compact, passively Q-switched fiber laser with a tunable output is demonstrated. The proposed system uses short length ytterbium doped to create very stable and compact optical circuit that black phosphorus (BP) as saturable absorber generate the desired pulses. Q-switch pulse train obtained, an operational wavelength range from 1056.6–1083.3 nm. Concurrently, maximum energy minimum width well repetition rate of 7.1 nJ, 4 µs 6.0–44.8 kHz respectively was obtained. will be able cater...

A Q-switched ytterbium doped fiber laser (YDFL) with a ZnO saturable absorber (SA) is used to demonstrate the generation of pulses in 1 micron region. The system has Q-switching threshold approximately 115.2 mW, and can generate 3.0 µs full-width at half maximum as well peak-to-pedestal ratio 53.0 dB. No spectral modulations are observed, indicating highly stable system. pulse output proposed repetition rates widths 50 kHz 1.6 µs, an average power 0.14 mW energy 2.8 nJ its highest pump 196...

A relative humidity (RH) sensor is proposed and demonstrated using a micro-knot resonator (MKR) enhanced with layer graphene oxide (GO) coating. The MKR fabricated by means of tapering standard fiber, the GO coating added drop-cast method. tested for an RH range between 0% 80% at 20% intervals, configurations without achieve sensitivities 0.0104 nm/% 0.0095 nm/%, respectively. configuration has linear response correlation coefficient 0.9098 resolution 0.1%, while 0.9548 0.096% which better....

In this work, we demonstrate a simple Q-switched pulsed ring ytterbium-doped fiber laser based on few-layer TI:Bi2Se3 saturable absorber (SA). Few-layer bismuth selenide within suspension was induced onto ferrule at room temperature via an optical deposition method, resulting in SA for the laser. Stable lasing achieved low pump threshold of 122.2 mW 974 nm. The pulse repetition rate ranged from 18.97 to 45.41 kHz, and narrowest width maximum energy were 13.1 μs 5.88 nJ respectively. Results...

In this paper, stable dual-wavelength generation using a strain technique for ytterbium-doped fiber laser is successfully demonstrated. A microfiber-based Mach-Zehnder interferometer inserted into the ring cavity and stretched xyz translation stage. Four sets of output lasing are obtained when applied onto microfiber. The possesses spacing between 7.12 11.59 nm, with displacement from 2 to 190 μm central wavelength. side-mode suppression ratio ∼48 dBm, while maximum power fluctuation...

In this paper, we have successfully demonstrated a stable dual, triple and quad-wavelength generation of ytterbium-doped fiber by incorporating non-adiabatic microfiber interferometer (N-MI) into the laser ring cavity. Three sets dual-wavelength, two triple-wavelength one set with same wavelength spacing 4.24 nm for all multiwavelengths over range 1035 to 1050 are obtained means nonlinear polarization rotation mechanism. The side-mode suppression ratio (SMSR) is ~53 dBm while fluctuation...

This paper describes a demonstration of passively dual-wavelength Q-switched ytterbium-doped fiber laser using selenium bismuth-based saturable absorber. By utilizing short-length photonic crystal in ring cavity and performing adjustments to the polarization state an incorporated controller (PC), we obtained stable output at 1037.14 1037.69 nm, with maximum pulse energy 0.65 nJ, shortest width 8.46 μs, repetition rate from 15.37 59.24 kHz. The consistently achieved high-power stability 0.8...

A simple ytterbium doped fiber laser (YDFL) setup was used to generate Q-switching pulses by using a D-shaped polished as wavelength selective filter. The gain medium in the cavity with length 70 cm. By utilizing MoSe2 film saturable absorber into cavity, stable dual produced at 1036.69 and 1039.22 nm. separation of output spectrum 2.53 We found maximum pulse energy 0.99 nJ shortest width 1.2 µs. have determined consistent dual-wavelength for 1-micron region.

In this paper, we propose and demonstrate the generation of dual wavelength based photonic crystal fiber passively Q-switched using few-layer TI:Bi2Te3 (bismuth telluride) saturable absorbers in a 1 micron waveband. The system employs bismuth, induced onto ferrule dry oven method. A centered dual-wavelength output at 1042.76 1047.0 nm was produced from Ytterbium doped laser setup by incorporating 10 cm finely adjusting polarization controller. self-started Q-switch had pump power 132.15 mW...

This paper describes the dual-wavelength operation in 1060 nm region by applying an ytterbium-doped gain medium fiber and a highly nonlinear (HNLF) as wavelength selective filter. Due to its properties birefringence co-efficient, HNLF also functions stabilizer for laser operation. Results from experiment show that fluctuated power of system is less than 0.6 dB when continuously run 20 min, indicating system's stability. The spacing output obtained fine-tuning polarization controller within...

Bismuth telluride (Bi 2 Te 3 ), a type of topological insulators, is currently in hot pursuit due to its unique physical properties.Therefore, this paper describes simple Q-switched Ytterbium-doped fiber laser (YDFL) by using Bi thin-film as saturable absorber.The few layers film was fabricated optical deposition technique and subsequently, used an all-fiber, YDFL setup.As result, self-starting Q-switching pulses were first occurred when the pumping power reached 88.6 mW.As pump level...

This paper describes a dual wavelength single longitudinal mode (SLM) demonstration for proposed ytterbium-doped fiber laser. A dualtapered Mach-Zehnder interferometer (MZI) was inserted into the laser ring cavity setup to ensure stable and SLM operation. The consequent lasing operation had spacing of 0.94 nm side suppression ratio (SMSR) 50 dB, with linewidth this measured as 294.15 kHz. stability test allowed measurement max power fluctuation less than 0.8 dB each which indicative

This paper describes the demonstration of a simple ytterbium-doped fiber (YDF) laser that utilized short length photonic crystal (PCF) in ring cavity and adjustments to polarization state an incorporated controller (PC) achieve stable dual-wavelength output. The lasing operation exploited Mach–Zehnder interferometer effect, output consistently achieved high power stability with 0.8 dB fluctuation over period 30 min. proposed setup has capability for adjustable spacing two wavelengths from...

We describe a successful demonstration of highly stable and narrowly spaced dual-wavelength output via an ytterbium-doped fiber laser. A microfiber-based Mach–Zehnder interferometer tunable bandpass filter were both placed into the laser ring cavity for purpose ensuring output. Experimental results comprised three sets lasing with wavelength spacing 0.06, 0.09, 0.22 nm, respectively, side-mode suppression ratio ∼50 dBm. subsequent stability test provided evidence that maximum power...

A tunable single- and dual-wavelength ytterbium-doped fiber laser, incorporating a 16-channel arrayed waveguide grating is proposed demonstrated. The side mode suppression ratio from the setup has an average value of 52.97 dB (single-wavelength generation) 58.19 (dual-wavelength generation). dual wavelength ranged 1039.98 nm to 1047.48 with spacing ranging 0.50 7.5 nm. stability test experiment shows power variation 0.8 dB, fluctuation 0.02 indicates reliability work.

The aim of the present study was to determine influence doping rare earth ion on strontium calcium aluminate (CaO–SrO–SiO 2 –Al O 3 ). Therefore, authors have manufactured luminescent material consisting 40CaO–5SrO–5SiO –50Al doped with Dy 3+ . compositions been selected basis chemical stability. Five pellets were prepared different calcination temperatures and times, namely 400 600°C for 1 h, in order shed light their luminescence behaviour. X-ray diffraction, energy dispersive analysis...

Abstract We have demonstrated an ultrafast mode-locked pulses generation by sandwiching graphene thin film between fiber ferrules in a simple erbium-doped laser (EDFL) ring cavity setup. The incorporation of acted as saturable absorber (SA) and had generated stable mode locked pulse with repetition rate 8.3 MHz, narrowest duration 1.38 picoseconds 1558.8 nm wavelength.