Results 41 to 50 of about 13,087 (290)

Coherent instabilities in a semiconductor laser with fast gain recovery [PDF]

, 2006
We report the observation of a coherent multimode instability in quantum cascade lasers (QCLs), which is driven by the same fundamental mechanism of Rabi oscillations as the elusive Risken-Nummedal-Graham-Haken (RNGH) instability predicted 40 years ago ...
A. Belyanin, A. Gordon, A. Yariv, A. Z. Grasiuk, C. Jirauschek, Christine Y. Wang, D. Bour, F. X. Kärtner, Federico Capasso, G. Höfler, H. Fu, H. Haken, H. Haken, J. Faist, L. Allen, L. Diehl, M. Troccoli, R. W. Boyd, S. Corzine, T. Voigt, Ya. I. Khanin   +20 more
core   +2 more sources

Mid-Infrared Dual-Wavelength Passively Q-Switched Er: SrF₂ Laser by CsPbCl₃ Quantum Dots Absorber

Crystals, 2022
A passively Q-switched compact dual-wavelength Er: SrF2 laser, operating at a 2729.73 nm and 2747.2 nm wavelength, was demonstrated by utilizing CsPbCl3 quantum dots (QDs) as a saturable absorber (SA).
Leilei Guo, Maorong Wang, Yifan Zhang, Shuaiyi Zhang, Kai Zhong, Qiuling Zhao, Lihua Teng, Xia Wang, Jianquan Yao   +8 more
doaj   +1 more source

Self-Pulsating Semiconductor Lasers: Theory and Experiment [PDF]

, 1999
We report detailed measurements of the pump-current dependency of the self-pulsating frequency of semiconductor CD lasers. A distinct kink in this dependence is found and explained using rate-equation model. The kink denotes a transition between a region
Elsasser, W., Hernandez-Garcia, E., Landais, P., Lenstra, D., Lynch, S., Miguel, M. San, Mirasso, C. R., O'Gorman, J., Phelan, P., van Tartwijk, G. H. M.   +9 more
core   +6 more sources

Inhibiting stearoyl‐CoA desaturase suppresses bone metastatic prostate cancer by modulating cellular stress, mTOR signaling, and DNA damage response

FEBS Letters, EarlyView.
Bone metastasis in prostate cancer (PCa) patients is a clinical hurdle due to the poor understanding of the supportive bone microenvironment. Here, we identify stearoyl‐CoA desaturase (SCD) as a tumor‐promoting enzyme and potential therapeutic target in bone metastatic PCa.
Alexis Wilson, Mackenzie K Herroon, Shane Mecca, Laimar C Garmo, Jacob Lindquist, Shrila Rajendran, Steve M. Patrick, Izabela Podgorski   +7 more
wiley   +1 more source

Physical vapor deposition of large-scale PbSe films and its applications in pulsed fiber lasers

Nanophotonics, 2019
Lead selenide (PbSe) is a new emerging semiconductor with layer-dependent bandgap that has attracted much interest due to its high infrared response and good environmental stability.
Gao Qun, Yang Hao, Hu Cuichen, He Zhiwen, Lu Hua, Zhang Wending, Mao Dong, Mei Ting, Zhao Jianlin   +8 more
doaj   +1 more source

Ultrafast Graphene-Plasmonic Hybrid Metasurface Saturable Absorber with Low Saturation Fluence

ACS Nano, 2023
Exploring novel materials with enhanced optical nonlinearities at low power levels with ultrafast response and small footprints is of great interests for information processing, communication, sensing and quantum systems. Recent progress on nonlinear metamaterials and metasurfaces suggests promising solutions to overcome the limitations of nonlinear ...
Md Zubair Ebne Rafique, Ali Basiri, Jing Bai, Jiawei Zuo, Yu Yao   +4 more
openaire   +3 more sources

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source

Passively Q-Switched Thulium-Doped Fiber Laser Employing a Glycerin-Based Saturable Absorber

Fibers
A passively Q-switched Thulium-doped fiber laser based on glycerin as the saturable absorber is experimentally demonstrated for the first time. The saturable absorber consists of two FC/PC connectors aligned within a mechanical fiber-fiber coupler, with ...
Edwin Addiel Espinosa-De-La-Cruz, Manuel Durán-Sánchez, Ulises Alcántara-Bautista, Alejandro Reyes-Mora, Adalid Ibarra-Garrido, Ivan Armas-Rivera, Luis Alberto Rodríguez-Morales, Miguel Bello-Jiménez, Baldemar Ibarra-Escamilla   +8 more
doaj   +1 more source

Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system

FEBS Letters, EarlyView.
Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
wiley   +1 more source

Numerical analysis of molecules intersystem crossing effect on a passively Q- switched laser pulse characteristics

Iraqi Journal of Physics, 2021
The effect of molecules intersystem crossing (Kisc) on characteristics (energy and duration) of a Passive Q- switched Laser Pulse has been studied by mathematical description (rate equations model) for temporal performance of which was used as a ...
Abdul-Kareem Mahdi Salih
doaj