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(2023)
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Summary: Periodic dielectric structures have the potential to control light propagation at micro-and nanoscale efficiently with low losses. Among various techniques, femtosecond Laser-Induced Forward Transfer (fs-LIFT) is a promising method due to its simplicity and ability to process different materials while maintaining their integrity. In this work, well-ordered periodic arrays of silk fibroin (SF) microstructures were successfully printed using fs-LIFT. Finite-element simulations were performed to study their response to electromagnetic radiation in the near to mid-infrared range with consideration of the substrate. The results showed a decrease in reflectivity, which was supported by experimental results. Coating the structures with a higher index dielectric material further enhanced the decrease in reflectivity in the mid-infrared range. This study demonstrates a straightforward approach to fabricate ordered arrays of SF microstructures, which have potential applications as controllable reflectivity coatings in the near to mid-infrared range.
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Zhiqi Sui et al.
Summary: In this study, a ZrS2-polyvinyl alcohol thin film modulator was successfully prepared by liquid phase exfoliation, and the excellent nonlinear absorption performance of ZrS2 was demonstrated. The large energy mode-locked phenomenon was achieved in an Er-doped fiber laser with ZrS2 as an optical modulator.
OPTICS AND LASER TECHNOLOGY
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Jialin Li et al.
Summary: Interface interactions in 2D vertically stacked heterostructures are important in optoelectronic applications, and recent research has shown promising performance of photodetectors based on graphene/InSe heterostructures. However, there is still insufficient understanding of the nonlinear optical properties of graphene/InSe heterostructures. In this study, a graphene/InSe heterostructure was fabricated by mechanical exfoliation and the optically induced charge transfer between the heterostructures was investigated. The results revealed a large built-in electric field at the interface and demonstrated the potential application of the heterostructure in a mode-locked laser. This work provides deeper insights into the interface interactions and enriches the range of saturable absorbers for ultrafast photonics applications.
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Optics
Lingfa Zeng et al.
Summary: In this work, a specially designed spindle-shaped fiber is used to suppress both Stimulated Raman Scattering (SRS) and transverse mode instability (TMI) in an oscillating-amplifying integrated fiber laser. The TMI threshold of the laser is raised to above 1.62 times of that in a reported oscillating-amplifying integrated fiber laser. Additionally, the SRS is suppressed by truncating the active fiber of the oscillating section, resulting in a laser output of 6 kW with an efficiency of 84.1% and a beam quality of M2 -1.78, which is the highest output power of the oscillating-amplifying integrated fiber laser.
OPTICS AND LASER TECHNOLOGY
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Muhammad Sohail et al.
Summary: The carbon nanoparticles (CNPs) were used as a saturable absorber (SA) for Q-switching an erbium doped fiber laser (EDFL). The Q-switched EDFL emitted at a wavelength of 1566 nm with a spectral bandwidth of 1.72 nm. The CNPs-based SA exhibited good pulse stability and the pulse frequency and width could be controlled by varying the pump power. The experimental results showed that the CNPs-based SAs could be equivalent or even superior to commonly used nano-particle SAs and had potential applications in pulsed laser sources.
OPTICS AND LASER TECHNOLOGY
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Jincheng Wei et al.
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CHINESE OPTICS LETTERS
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Daniel Flamm et al.
Summary: A procedure and optical concept are introduced for cleaving transparent materials with customized edges using ultrashort pulsed lasers in a single pass. The procedure involves holographically splitting foci along the desired edge geometry, including C-shaped edges with local 45-degree tangential angles. Single-pass, full-thickness laser modifications are achieved with single-side access to the workpiece, and actual separation is performed using selective etching strategy after inducing laser modifications at a feed rate of approximately 1 m/s.
JOURNAL OF LASER APPLICATIONS
(2022)
Article
Optics
Jawad Mirza et al.
Summary: In this paper, a novel and widely tunable and switchable multiwavelength erbium-doped fiber laser (EDFL) operating in the 1524-1650 nm wavelength range is proposed and demonstrated through numerical simulations. The EDFL is based on a single ring cavity and a single forward pump source operating at 980 nm wavelength. The length of the erbium-doped fiber and pumping configuration is optimized to enable a wide tuning of 126 nm with an average lasing power of 15 dBm. Switchable multiple wavelengths are generated from the EDFL through an intracavity tunable optical filter (TOF) and a specially designed out-of-cavity comb filter (CF). The proposed EDFL is low cost, efficient, and highly stable with an average output power of around 15 dBm for 10% output coupling ratio over a 126 nm wide tuning range covering C-, L- and U-bands.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
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Suziana Omar et al.
Summary: This paper presents a new saturable absorber (SA) based on Lanthanum Hexaboride (LaB6) for generating Q-switched and mode-locked laser pulses. By dispersing LaB6 powder in polyvinyl alcohol (PVA) solution to form a thin film, a LaB6 PVA SA is produced and incorporated into an erbium-doped fiber laser (EDFL) cavity. The study demonstrates the first successful utilization of LaB6 material as SA to produce pulses in the 1.5 μm region.
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M. A. A. B. Sahib et al.
Summary: In this study, a MXene Ti3C2Tx thin-film is proposed as a saturable absorber (SA) for generating mode-locked laser pulses. By dispersing Ti3C2Tx powder in a PVA solution and forming a thin film, the SA device is constructed and integrated into an erbium-doped fiber laser cavity to produce mode-locked pulses with specific parameters.
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S. Ooi et al.
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Optics
V Zinnecker et al.
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OPTICS AND LASER TECHNOLOGY
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Rawan S. M. Soboh et al.
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Manuel Duran-Sanchez et al.
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IEEE PHOTONICS TECHNOLOGY LETTERS
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Przemyslaw ChmielowskI et al.
Summary: In this paper, a continuous-wave widely wavelength-tunable fiber laser based on erbium- and bismuth-doped fibers in parallel configuration is experimentally demonstrated. A diffraction grating is used for wavelength tuning, and a tuning range of 268 nm is achieved, which is significantly greater than previously demonstrated erbium or bismuth doped fiber lasers in the same spectral region.
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Yanming Zhang et al.
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Ahmad Fauzi Abas et al.
Summary: This work demonstrates a dual-wavelength passively mode-locked erbium-doped fiber laser using graphene nanoplatelet as a saturable absorber. The bidirectional dual-wavelength oscillation scheme is found advantageous in providing narrower pulse widths and higher pulse energy compared to the unidirectional scheme. This study expands the cavity structure design dynamics for synchronized dual-wavelength mode-locked fiber laser generation.
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Lihui Pang et al.
Summary: Nanotechnology is a promising field for technological development, and GaSb materials show great potential for nonlinear optical device applications. This study calculates the electronic band structures of GaSb and validates its application in dissipative soliton fiber lasers. Experimental results demonstrate that a GaSb thin film deposited on a microfiber can generate dissipative soliton laser pulses with a fundamental frequency of 43.5 MHz, indicating its potential in ultrafast optics.
ACS APPLIED MATERIALS & INTERFACES
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Gang Yao et al.
Summary: This paper presents an actively mode-locked fiber laser with controllable pulse repetition rate and tunable pulse duration. An optical delay line is used to adjust the cavity length for regulating the repetition rate, and a semiconductor optical amplifier is introduced for pulse duration control. Experimental results show that the repetition rate can be continuously tuned from 2 GHz to 6 GHz, and the pulse duration can be tuned from 4 ps to 30 ps when the repetition rate is fixed at 2.5 GHz, which is the widest tuning range ever achieved in a gigahertz repetition rate actively mode-locked 1.5 μm fiber laser oscillator.
CHINESE OPTICS LETTERS
(2022)
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Song Yang et al.
Summary: Highly monodisperse and perfect crystalline PbS/CdS quantum dots with bright infrared fluorescence emissions have been synthesized and incorporated into a thin film as a saturable absorber, leading to stable Q-switched and mode-locked laser pulses.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
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Jawad Mirza et al.
Summary: In this paper, a high-power pump source based on YDFL for TDFAs is proposed and demonstrated through numerical simulations. The pump source exhibits a wide tuning range, high output power, high optical signal-to-noise ratio (OSNR), and narrow linewidth.
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Pengpeng Wang et al.
Summary: Alpha-Fe2O3 nanosheets embedded in PVA films exhibit potential applications in nonlinear optics, particularly as thin-film saturable absorbers. In erbium doped fiber lasers based on Alpha-Fe2O3-PVA SAs, stable mode-locked operations are achieved, showcasing the excellent candidacy of Alpha-Fe2O3 nanosheets as two-dimensional saturable absorption materials.
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