Efficient continuous-wave and short-pulse Ho3+-doped fluorozirconate glass all-fiber lasers operating in the visible spectral range

Nanoscale ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 5272-5279 ◽  
Author(s):  
Wensong Li ◽  
Jiaji Wu ◽  
Xiaofeng Guan ◽  
Zhiyong Zhou ◽  
Huiying Xu ◽  
...  
Keyword(s):  
Spectral Range ◽  
Fiber Lasers ◽  
Continuous Wave ◽  
Short Pulse ◽  
Visible Spectral Range ◽  
Wavelength Tunable ◽  
Fluorozirconate Glass ◽  
Q Switching

Wavelength-tunable continuous-wave and Q-switching visible Ho3+-doped all-fiber lasers emitting at green and deep-red wavelengths are successfully demonstrated.

scholarly journals Supercontinuum Generation in the Cladding Modes of an Endlessly Single-Mode Fiber

2019 ◽  
Vol 9 (20) ◽  
pp. 4428 ◽  
Author(s):  
Tobias Baselt ◽  
Bryan Nelsen ◽  
Andrés Fabián Lasagni ◽  
Peter Hartmann
Keyword(s):  
Photonic Crystal ◽  
Spectral Range ◽  
Short Pulse ◽  
Group Velocity Dispersion ◽  
Damage Threshold ◽  
Nonlinear Effects ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Visible Spectral Range ◽  
The Core

In photonic crystal fibers, light guidance can be achieved by a central defect of a periodic structure of air holes in a silica glass matrix and the dispersion can be adjusted over a wide spectral range to enhance nonlinear effects. By coupling short pulse laser radiation into the core with tight confinement and utilizing the nonlinear properties of glass, this radiation can be converted to a broad spectral distribution. The tight confinement puts limits on the maximum pulse fluence propagating in the core due to the damage threshold of the glass. Therefore, when higher power spectral densities are desired, it is favorable to spread the generation of light over a much larger area to prevent fiber damage. We present here a method for generating a supercontinuum using the cladding modes of an endlessly single-mode fiber. These modes generate a supercontinuum utilizing a multimodal quasi-continuum of states, for which dispersion is governed by the guiding properties of the material between the air-filled holes in the cladding. The system also provides experimental access to unique phenomena in nonlinear optics. Simulations of the propagation properties of the core mode and cladding modes were compared with measurements of the group-velocity dispersion in a modified white-light Mach–Zehnder interferometer. The coupling of similar laser parameters into the cladding of the photonic crystal fiber enables a significant increase in conversion efficiency in the visible spectral range compared with the core-pumped case.

scholarly journals MoS2 Based Photodetectors: A Review

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2758
Author(s):  
Alberto Taffelli ◽  
Sandra Dirè ◽  
Alberto Quaranta ◽  
Lucio Pancheri
Keyword(s):  
Electric Fields ◽  
Spectral Range ◽  
Performance Metrics ◽  
Transition Metal Dichalcogenides ◽  
Visible Spectral Range ◽  
Detector Performance ◽  
Strong Light ◽  
Near Ultraviolet ◽  
Passivation Layers ◽  
Low Dimensional

Photodetectors based on transition metal dichalcogenides (TMDs) have been widely reported in the literature and molybdenum disulfide (MoS2) has been the most extensively explored for photodetection applications. The properties of MoS2, such as direct band gap transition in low dimensional structures, strong light–matter interaction and good carrier mobility, combined with the possibility of fabricating thin MoS2 films, have attracted interest for this material in the field of optoelectronics. In this work, MoS2-based photodetectors are reviewed in terms of their main performance metrics, namely responsivity, detectivity, response time and dark current. Although neat MoS2-based detectors already show remarkable characteristics in the visible spectral range, MoS2 can be advantageously coupled with other materials to further improve the detector performance Nanoparticles (NPs) and quantum dots (QDs) have been exploited in combination with MoS2 to boost the response of the devices in the near ultraviolet (NUV) and infrared (IR) spectral range. Moreover, heterostructures with different materials (e.g., other TMDs, Graphene) can speed up the response of the photodetectors through the creation of built-in electric fields and the faster transport of charge carriers. Finally, in order to enhance the stability of the devices, perovskites have been exploited both as passivation layers and as electron reservoirs.

Watt-Level Visible Continuous-Wave Upconversion Fiber Lasers toward the “Green Gap” Wavelengths of 535–553 nm

ACS Photonics ◽  
2021 ◽  
Author(s):  
Shuaihao Ji ◽  
Shaoqun Liu ◽  
Xiuji Lin ◽  
Yingyi Song ◽  
Bo Xiao ◽  
...  
Keyword(s):  
Fiber Lasers ◽  
Continuous Wave

Tin Telluride Quantum Dots as a Novel Saturable Absorber for Q‐Switching and Mode Locking in Fiber Lasers

2020 ◽  
pp. 2001821
Author(s):  
Safayet Ahmed ◽  
Junpeng Qiao ◽  
Ping Kwong Cheng ◽  
Ahmed Mortuza Saleque ◽  
Mohammad Ismail Hossain ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Saturable Absorber ◽  
Fiber Lasers ◽  
Mode Locking ◽  
Tin Telluride ◽  
Q Switching

scholarly journals A Passively Q-Switched Holmium-Doped Fiber Laser with Graphene Oxide at 2058 nm

2021 ◽  
Vol 11 (1) ◽  
pp. 407
Author(s):  
Jinho Lee ◽  
Ju Han Lee
Keyword(s):  
Graphene Oxide ◽  
Pump Power ◽  
Fiber Laser ◽  
Ring Resonator ◽  
Continuous Wave ◽  
Optical Power ◽  
Polished Surface ◽  
Fiber Ring ◽  
Q Switching ◽  
Side Polished Fiber

This study reports a Q-switching-based, 2058-nm holmium (Ho) fiber laser incorporating a saturable absorber (SA) based on graphene oxide (GO). The SA was prepared with a side-polished fiber, while GO particles were deposited onto the fiber-polished surface to realize an all-fiber SA. A continuous-wave thulium-doped all-fiber laser, which was configured with a master-oscillator power-amplifier (MOPA) structure, was constructed as a pumping source. By inserting the fabricated SA into an all-fiber ring resonator based on 1-m length of Ho-doped fiber, Q-switched pulses could readily be obtained at a wavelength of 2058 nm. The pulse width was observed to vary from 2.01 to 1.56 μs as the pump power was adjusted from ~759 to 1072 mW, while the repetition rate was tunable from 45.56 to 56.12 kHz. The maximum values of average optical power and pulse energy were measured as ~11.61 mW and 207.05 nJ, respectively, at a ~1072 mW pump power.

scholarly journals TiN/(Al,Sc)N metal/dielectric superlattices and multilayers as hyperbolic metamaterials in the visible spectral range

2014 ◽  
Vol 90 (12) ◽  
Author(s):  
Bivas Saha ◽  
Gururaj V. Naik ◽  
Sammy Saber ◽  
Cem Akatay ◽  
Eric A. Stach ◽  
...  
Keyword(s):  
Spectral Range ◽  
Visible Spectral Range ◽  
Hyperbolic Metamaterials
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