Elektrik - Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Güncel Gönderiler
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Pushing the tuning limits of femtosecond Yb-based solid-state lasers to 1 µm: a Yb:YVO4 laser tunable down to 1004 nm
(Optics Letters, 2024)We have obtained what we believe to be the shortest fs tuning wavelength (1004 nm) from a Yb-based solid-state laser system. As the working horse, we have chosen Yb:YVO4 due to its blueshifted gain spectrum. While using a ... -
Fractional thermal load in cryogenically cooled Yb:YLF and Yb:YAG lasers
(Optical Materials Express, 2024)We present a method for the direct measurement of the fractional thermal load (FTL) in cryogenically cooled laser crystals. The experimental methodology involves characterizing the liquid nitrogen evaporation rate in a ... -
Advantages of pulse-train excitation in narrow-band terahertz generation: mitigation of undesired nonlinear effects
(Optica Publishing Group, 2024)In this work, we have studied the limitations of narrowband multi-cycle (MC) terahertz (THz) generation via optical rectification (OR) in periodically poled lithium niobate (PPLN) crystals. Detailed investigation of the ... -
Multi-watt SESAM mode-locking and broad CW tuning (996–1073 nm) in diode-pumped Yb:LLF laser
(Optica, 2024)We report broadest continuous-wave tuning in 996-1073 nm range and SESAM modelocking with highest power 1.6-2.8 W (352-570 mW) and 181 fs (110 fs) long pulses from diodepumped Yb:LLF laser systems. -
Power scaling potential of diode-pumped Cr:LiCAF slab lasers to >10 W Level in continuous-wave operation
(2024)We have experimentally and numerically investigated the power scaling capacity of diode edge-pumped Cr:LiCAF slab lasers employing low chromium doped samples and showed their potential to exceed 10 W output power level ... -
Dual-Wavelength CW and CW mode-locked Cr:Colquirrite Lasers
(Optica, 2024)We show the versatile dual-wavelength operation of Cr:LiCAF and Cr:LiSAF lasers around 790 and 850 nm using diving optical-axis birefringent filters. In mode-locked regime, tunable synchronous two-color picosecond pulses ... -
Temperature dependence of THz generation efficiency, THz refractive index, and THz absorption in lithium-niobate around 275 GHz
(Optical Materials Express, 2024)In this study, we demonstrate the capabilities of the pulse train excitation approach in determining key material properties of nonlinear crystals, such as refractive index, thermo-optic coefficient, and absorption. The ... -
1.1-GHz SESAM-Modelocked Femtosecond Yb:YLF Laser
(Optica, 2024)We report the first GHz Yb:YLF laser generating 210 fs long pulses at 40 mW average power output from a low-cost, self-starting, single-mode diode pumped cavity with integrated relative intensity noise <0.45%. -
Dual-wavelength synchronously mode-locked Cr:LiSAF laser with a tunable beating frequency and a central wavelength
(Optica, 2024)We demonstrate a versatile dual-wavelength synchronous mode-locking of a diode-pumped Cr:LiSAF laser for the first time, to our knowledge. A two-color mode-locked operation is achieved by using intracavity birefringent ... -
Diode-pumped passively mode-locked femtosecond Yb:YLF laser at 1.1 GHz
(Optica, 2024)We report femtosecond pulse generation at GHz repetition rates with the Yb:YLF gain medium for the first time. A simple, low-cost, and compact architecture is implemented for the potential usage of the system as a low-noise ... -
Assessment of electromagnetic shielding efficacy of magnetic metal oxide nanoparticles and their application in electromagnetic shielding paints
(Chemistry Europe, 2024)People are continuously exposed to electromagnetic waves emitted by mobile phones, base stations, computers, household electrical appliances, and nearby devices. Shielding against electromagnetic radiation is of great ... -
Challenges in power scaling of Cr:LiCAF lasers: effect of passive losses
(Optica, 2024)In this work, we have investigated the continuous-wave (cw) lasing potential of thin slab-shaped Cr:LiCAF crystals with a low chromium doping level of around 1% and various lengths of 1 to 2 cm. These relatively long ... -
Construction of a miniaturized monosaccharide detection system based on measuring electric current and testing its performance using a bodipy fluorescent dye
(Multidisciplinary Digital Publishing Institute (MDPI), 2023)In this study, a low-cost, miniaturized fluorescence-based measurement system for optical biosensors has been developed. A 3D-printed setup with a blue light-emitting diode (LED) and photodiode was used for electrical ... -
Encapsulation of diiodo-BODIPY in sodium dodecyl sulfate stabilized cellulose acetate capsules for enhanced singlet oxygen production in aqueous solution
(Wiley, 2023)As drug delivery vehicles, polymeric capsules have become highly versatile structures to protect the active substrate from degradation, improve biocompatibility, and provide controlled release. In particular, encapsulation ... -
Sodium-Alginate based composite films for effective removal of congo red and coralene dark red 2B dyes: kinetic, isotherm and thermodynamic analysis
(MDPI, 2023)The present study aimed to investigate the adsorption capacity of two anionic dyes, namely, Congored (CR) and Coralene Dark Red2B (DR), onto prepared alginate (Alg) and chitosan(Cs) biopolymer films. The two biopolymers ... -
Exploring the photocatalytic and photodynamic effects of BODIPY-linked titanium dioxide nanoparticles
(TUBITAK, 2023)This study aimed to investigate the photocatalytic and photodynamic actions of a 2,6-diiodinated-BODIPY (2,6-diI2Bod) photosensitizer (PS) covalently linked to TiO2 nanoparticles (NPs). The TiO2 NPs were synthesized utilizing ... -
Shungite/Poly(vinyl alcohol) hybrid hydrogels: An efficient adsorption material for rare earth metals in aqueous media
(Wiley, 2023)Rare earth elements play a pivotal role in modern technologies, therebydriving an escalating demand for their procurement. To effectively extractthese elements from aqueous solutions, it is imperative to explore innovativesorbent ... -
Enhancement of enzyme activity by laser-induced energy propulsion of upconverting nanoparticles under near-infrared light: A comprehensive methodology for in vitro and in vivo applications
(Elsevier, 2024)If the appropriate immobilization method and carrier support are not selected, partial decreases in the activity of enzymes may occur after immobilization. Herein, to overcome this challenge, an excitation mechanism that ... -
Near-infrared inducible supports in bio-catalysts design: A useful and versatile tool in enhancement of enzyme activity
(2024)Immobilized enzymes have encountered two main challenges: Reduced enzyme activity compared to free enzymes and exhausted immobilized enzymes due to reusability. Herein, we suggested a promising activity enhancement strategy ... -
Thermal and population lensing of Yb:YLF at cryogenic temperature
(2023)We present what is, to our knowledge, the first detailed study of thermal and population lensing in cryogenically cooled Yb:YLF. Using a rod-shaped a-cut Yb:YLF crystal, the thermal lens strength is measured as a function ...
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