scholarly journals Palladium selenide as a broadband saturable absorber for ultra-fast photonics

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2557-2567 ◽  
Author(s):  
Huanian Zhang ◽  
Pengfei Ma ◽  
Mingxiao Zhu ◽  
Wenfei Zhang ◽  
Guomei Wang ◽  
...  
Keyword(s):  
Pulse Width ◽  
Photonic Devices ◽  
Average Output ◽  
Electronic Band ◽  
Central Wavelength ◽  
Saturable Absorbers ◽  
Application Potential ◽  
Maximum Average Output Power ◽  
Promising Application ◽  
Er Doped

AbstractAir-stable broadband saturable absorbers (SAs) exhibit a promising application potential, and their preparations are also full of challenges. Palladium selenide (PdSe2), as a novel two-dimensional (2D) layered material, exhibits competitive optical properties including wide tunable bandgap, unique pentagonal atomic structure, excellent air stability, and so on, which are significant in designing air-stable broadband SAs. In our work, theoretical calculation of the electronic band structures and bandgap characteristics of PdSe2 are studied first. Additionally, PdSe2 nanosheets are synthesized and used for designing broadband SAs. Based on the PdSe2 SA, ultrafast mode-locked operations in 1- and 1.5-μm spectral regions are generated successfully. For the mode-locked Er-doped operations, the central wavelength, pulse width, and pulse repetition rate are 1561.77 nm, 323.7 fs, and 20.37 MHz, respectively. Meanwhile, in all normal dispersion regions, mode-locked Yb-doped fiber laser with 767.7-ps pulse width and 15.6-mW maximum average output power is also generated successfully. Our results fully reveal the capacity of PdSe2 as a broadband SA and provide new opportunities for designing air-stable broadband ultra-fast photonic devices.

scholarly journals Graphdiyne Saturable Absorber for Passively Q-Switched Ho3+-Doped Laser

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1848
Author(s):  
Cheng Zhang ◽  
Qianqian Hao ◽  
Yuqian Zu ◽  
Mengyu Zong ◽  
Jia Guo ◽  
...  
Keyword(s):  
Saturable Absorber ◽  
Pulse Width ◽  
Optical Modulator ◽  
Saturable Absorption ◽  
Carbon Nanostructure ◽  
Absorption Properties ◽  
Promising Candidate ◽  
Average Output ◽  
Short Pulses ◽  
Maximum Average Output Power

High-quality all-carbon nanostructure graphdiyne (GDY) saturable absorber was successfully fabricated and saturable absorption properties in the 2 μm region were characterized using a commercial mode-locked laser as a pulsed source. The fabricated GDY was first used as an optical switcher in a passively Q-switched Ho laser. Under absorbed pump power of 2.4 W, the maximum average output power and shortest pulse width were 443 mW and 1.38 µs, at a repetition rate of 29.72 kHz. The results suggest that GDY nanomaterial is a promising candidate as an optical modulator for generation of short pulses in Ho-doped lasers at 2.1 μm.

scholarly journals Gold Nanocages as Saturable Absorbers for Passively Q-Switched Nd:YVO4 Lasers with Optimized Performance

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 903
Author(s):  
Bin Zhang ◽  
Xiaohan Chen ◽  
Haoyuan Li ◽  
Liwei Xu ◽  
Binghai Liu ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Pump Power ◽  
Surface Plasmon ◽  
Optical Conversion Efficiency ◽  
Center Wavelength ◽  
Average Output ◽  
Saturable Absorbers ◽  
Maximum Average Output Power ◽  
Gold Nanocages ◽  
Output Characteristics

Based on a gold nanocage saturable absorber (GNC-SA) with the surface plasmon resonance (SPR) absorption peak located at 1.06 μm, passively Q-switched Nd:YVO4 lasers with a center wavelength of 1064.1 nm were demonstrated. Q-switched pulses with the shortest pulse duration of 143 ns and a pulse repetition rate of 467 kHz were achieved at transmittance T = 4% under a pump power of 5.98 W. Under a pump power of 3.95 W, the maximum average output power of 372 mW was obtained at a laser with transmittance of 10.8%, corresponding to an optical conversion efficiency of 9.4% and a slope efficiency of 14.1%. Our results reveal that for passively Q-switched lasers at a given wavelength, we are able to synthesize the most suitable GNC-SA to obtain the best output characteristics of lasers.

Q-switched erbium-doped fiber laser operating at 1502nm with molybdenum disulfide saturable absorber

2016 ◽  
Vol 25 (02) ◽  
pp. 1650025 ◽  
Author(s):  
E. I. Ismail ◽  
A. Kadir ◽  
A. A. Latiff ◽  
H. Ahmad ◽  
S. W. Harun
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Molybdenum Disulfide ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Solution Concentration ◽  
Final Solution ◽  
Average Output ◽  
Erbium Doped ◽  
Maximum Average Output Power

We demonstrate a Q-switched Erbium-doped fiber laser (EDFL) using a molybdenum disulfide (MoS[Formula: see text]-based saturable absorber (SA) as a Q-switcher. The SA is prepared from commercial available MoS2 pristine flakes with final solution concentration of [Formula: see text]0.02[Formula: see text]mg/ml. The Q-switcher is assembled by depositing a dried MoS2 onto a fiber ferule facet before it is matched with another clean ferrule via a connector. By increasing the pump power from 120[Formula: see text]mW to 160[Formula: see text]mW, stable generation of Q-switched EDFL incorporating MoS2 SA has been obtained at 1502[Formula: see text]nm wavelength. The pulse repetition rate also varies from 45.2[Formula: see text]kHz to 66.0[Formula: see text]kHz with pulse width which is increased from 2.73[Formula: see text][Formula: see text]s to 3.19[Formula: see text][Formula: see text]s. At pump power of 160[Formula: see text]mW, we successfully generated the maximum average output power of 0.51[Formula: see text]mW, corresponding to a pulse energy of 7.8[Formula: see text]nJ.

scholarly journals Environmentally stable black phosphorus saturable absorber for ultrafast laser

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2445-2449 ◽  
Author(s):  
Xinxin Jin ◽  
Guohua Hu ◽  
Meng Zhang ◽  
Tom Albrow-Owen ◽  
Zheng Zheng ◽  
...  
Keyword(s):  
Environmental Conditions ◽  
Pulse Width ◽  
Ultrafast Lasers ◽  
Laser Cavity ◽  
Spectral Width ◽  
Black Phosphorus ◽  
Central Wavelength ◽  
Saturable Absorbers ◽  
Potential Applications ◽  
Adverse Environmental Conditions

AbstractBlack phosphorus (BP) attracts huge interest in photonic and optoelectronic applications ranging from passive switch for ultrafast lasers to photodetectors. However, the instability of chemically unfunctionalized BP in ambient environment due to oxygen and moisture remains a critical barrier to its potential applications. Here, the parylene-C layer was used to protect inkjet-printed BP-saturable absorbers (BP-SA), and the efficacy of this passivation layer was demonstrated on the stable and continuous operation of inkjet-printed BP-SA in harsh environmental conditions. BP-SA was integrated in an erbium-doped ring laser cavity and immersed in water at ~60°C during operation for investigation. Mode-locked pulses at ~1567.3 nm with ~538 fs pulse width remained stable for >200 h. The standard deviation of spectral width, central wavelength, and pulse width were 0.0248 nm, 0.0387 nm, and 2.3 fs, respectively, in this period, underscoring the extreme stability of BP-SA against high temperature and humidity. This approach could enable the exploitation of BP-based devices for photonic applications when operating under adverse environmental conditions.

scholarly journals Passively Q-switched Yb-doped all-fiber laser based on Ag nanoplates as saturable absorber

Nanophotonics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 3873-3880
Author(s):  
Bo Fu ◽  
Pan Wang ◽  
Yan Li ◽  
Marcello Condorelli ◽  
Enza Fazio ◽  
...  
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Modulation Depth ◽  
Single Pulse ◽  
Average Output ◽  
Saturable Absorbers ◽  
Maximum Average Output Power ◽  
Easy Integration ◽  
First Time

AbstractWe report on a Q-switched Yb-doped all-fiber laser based on a solution-processed Ag nanoplates saturable absorber. Optical deposition procedure is implemented to transfer the Ag nanoplates onto the fiber core area through the thermal effect. The saturable absorber is sandwiched between two fiber connectors, providing simplicity, flexibility, and easy integration into the laser oscillator. The modulation depth and saturation incident fluence are measured to be ~5.8% and ~106.36 μJ/cm2 at 1-μm region, respectively. Self-started stable Q-switched operation is achieved for a threshold pump power of 180 mW. The repetition rates of the pulse trains range from 66.6 to 184.8 kHz when the pump power scales from 210 to 600 mW. The maximum average output power is 10.77 mW, corresponding to the single-pulse energy of 58.3 nJ and minimum pulse duration of ~1.01 μs. To the best of our knowledge, it is the first time that the Ag nanoplates saturable absorbers are utilized in the 1-μm Yb-doped Q-switched fiber laser.

Structural and compositional properties of Er-doped silicon nanoclusters/oxides for multilayered photonic devices studied by STEM-EELS

Nanoscale ◽  
2013 ◽  
Vol 5 (20) ◽  
pp. 9963 ◽  
Author(s):  
Alberto Eljarrat ◽  
Lluís López-Conesa ◽  
José Manuel Rebled ◽  
Yonder Berencén ◽  
Joan Manel Ramírez ◽  
...  
Keyword(s):  
Photonic Devices ◽  
Silicon Nanoclusters ◽  
Doped Silicon ◽  
Er Doped ◽  
Compositional Properties

scholarly journals Continuous-Wave and Passively Q-Switched Er:Y2O3 Ceramic Laser at 2.7 μm

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Zhipeng Qin ◽  
Guoqiang Xie ◽  
Jian Zhang ◽  
Jingui Ma ◽  
Peng Yuan ◽  
...  
Keyword(s):  
Output Power ◽  
Continuous Wave ◽  
Maximum Output Power ◽  
Maximum Output ◽  
Average Output ◽  
Semiconductor Saturable Absorber ◽  
Infrared Spectral ◽  
Maximum Average Output Power ◽  
Ceramic Laser ◽  
Stable Passive

We report on a continuous-wave (CW) and passively Q-switched Er:Y2O3 ceramic laser in mid-infrared spectral region. In the CW regime, a maximum output power of 2.07 W is achieved at 2717.3 nm with a slope efficiency of 13.5%. Stable passive Q-switching of the Er:Y2O3 ceramic laser is demonstrated based on semiconductor saturable absorber mirror. Under an absorbed pump power of 12.4 W, a maximum average output power of 223 mW is generated with a pulse energy of 1.7 μJ and a pulse width of 350 ns at 2709.3 nm.

scholarly journals Comparative Study of Thyristor vs IGBT Based AC-DC Power Converter

2018 ◽  
Vol 17 (3) ◽  
pp. 89-102
Author(s):  
Md. Saiful Islam ◽  
Md. Rifat-Ul-Karim Shovon ◽  
Abdul Goffar Khan
Keyword(s):  
Comparative Study ◽  
Pulse Width ◽  
Output Voltage ◽  
Harmonic Distortion ◽  
Power Converter ◽  
Wave Shape ◽  
Average Output ◽  
Dc Power ◽  
Voltage Wave ◽  
The Relationship

This paper presents a comparative study of the application of Thyristor versus IGBT in AC-DC controlled power converter. Both simulation and practical experiment have been carried out to test the relationship between the average output voltage (Vdc) with firing angle (α, for Thyristor) and triggering pulse width (, for IGBT). Also the total harmonic distortion (THD) has been observed in both the cases. It is observed that IGBT based power converter introduces more harmonics in the system, in spite of more symmetrical output voltage wave shape.

Passively mode-locked in Er-doped fiber laser based on semi-metallic InBi saturable absorber

2021 ◽  
Author(s):  
Jianwei Hu ◽  
Rong Huang ◽  
Ziqiao Wei ◽  
Minru Wen ◽  
Fugen Wu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Modulation Depth ◽  
Mode Locking ◽  
Nodal Line ◽  
Saturable Absorption ◽  
Optical Nonlinearities ◽  
Passive Mode ◽  
Central Wavelength ◽  
Two Dimensional Materials ◽  
Er Doped

Abstract Two-dimensional materials have drawn great interest for their applications in mode-locking owning to their unique optical nonlinearities. However, most of these 2D materials are semi-conductor. In this study, a new kind of semimetal Indium bismuth (InBi) is reported which is a topological nodal-line semimetal with exotic physical properties. The InBi nanomaterials was prepared through liquid phase exfoliation method with average thickness of 32.8 nm. The saturable absorption property was measured and passive mode-locking operation was achieved successfully in Er-doped fiber laser. It exhibits a modulation depth of 3.21%, a saturable intensity of 100 MW/cm2, and a pulse width about 859.97 fs corresponding to the central wavelength of 1562.27 nm and 3-dB bandwidth of 2.98 nm. The experimental results open a new avenue for the use of semimetals InBi nanomaterials in lasers and photonics applications.

A promising hydrogen peroxide adduct of ammonium cyclopentazolate as a green propellant component

2020 ◽  
Vol 8 (25) ◽  
pp. 12334-12338 ◽  
Author(s):  
Jin Luo ◽  
Honglei Xia ◽  
Wenquan Zhang ◽  
Siwei Song ◽  
Qinghua Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Green Propellant ◽  
Application Potential ◽  
Promising Application

A novel hydrogen peroxide adduct of ammonium cyclopentazolate was successfully synthesized and shows promising application potential as a green propellant component.

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