Results 31 to 40 of about 3,885 (181)

Narrow Linewidth 510 nm Laser via Single-Pass Frequency-Tripling by Waveguide PPLNs

Photonics
A single-frequency narrow linewidth green laser at 510 nm is a vital component for the study of Cesium Rydberg atoms. Here, we demonstrate a 510 nm laser based on single-pass second-harmonic generation (SHG) and sum-frequency generation (SFG) via ...
Yanlin Chen, Jing Zhang, Xiaolang Qiu, Suo Wang, Chuanchuan Li, Haiyang Yu, Xin Wei   +6 more
doaj   +1 more source

Symmetric Step-Apodized Distributed Feedback Fiber Laser With Improved Efficiency

IEEE Photonics Journal, 2019
We propose and demonstrate a symmetric step-apodized distributed feedback (DFB) fiber laser, which has an improved efficiency and a narrow linewidth. This special DFB laser cavity is based on a unique symmetric step-apodized π-phase-shifted fiber ...
Kuikui Guo, Jun He, Kaiming Yang, Zhe Zhang, Xizhen Xu, Bin Du, Gaixia Xu, Yiping Wang   +7 more
doaj   +1 more source

Ultrafast Imaging of Physiological Brain Pulsations With Magnetic Resonance Encephalography-From Noise to Predictive Clinical Biomarker. [PDF]

NMR Biomed
Human brain pulsations shown in this picture drive both blood and CSF flow. These pulsations can now be accurately detected with ultrafast MREG imaging. The ultrafast imaging offers early detection of abnormal brain pulsations that can precede tissue degeneration in Alzheimer's disease or predict mortality in brain lymphoma treatment. ABSTRACT Over the
Kiviniemi V, Helakari H, Raitamaa L, Huotari N, Rajna Z, Järvelä M, Elabasy A, Tuunanen J, Poltojainen V, Väyrynen T, Tuovinen T, Kananen J, Korhonen V.   +12 more
europepmc   +2 more sources

Self-heterodyned detection of dressed state coherences in helium by noncollinear extreme ultraviolet wave mixing with attosecond pulses [PDF]

, 2020
Noncollinear wave-mixing spectroscopies with attosecond extreme ultraviolet (XUV) pulses provide unprecedented insight into electronic dynamics. In infrared and visible regimes, heterodyne detection techniques utilize a reference field to amplify wave ...
Bloch, E, Fidler, AP, Leone, SR, Marroux, HJB, Neumark, DM, Warrick, ER   +5 more
core   +1 more source

Dispersion‐Less Dissipative Soliton Fiber Laser

Laser &Photonics Reviews, EarlyView.
A dispersion‐less fiber laser architecture generates high‐energy, pedestal‐free picosecond pulses without resorting to conventional pulse stretching. This energy‐managed laser achieves remarkable flexibility in pulse parameters, delivering up to 0.54 μJ$\mathrm{\mu}\mathrm{J}$ pulses with minimal spectral distortion using standard telecom components ...
Mostafa I. Mohamed, Aurélien Coillet, Philippe Grelu   +2 more
wiley   +1 more source

Characterization and Compensation of the Residual Chirp in a Mach-Zehnder-Type Electro-Optical Intensity Modulator

, 2010
We utilize various techniques to characterize the residual phase modulation of a fiber-based Mach-Zehnder electro-optical intensity modulator. A heterodyne technique is used to directly measure the phase change due to a given change in intensity, thereby
Auracher, Bakos, Bakos, C. E. Rogers III, Courjal, Devaux, Dorrer, J. A. Pechkis, J. L. Carini, Kawanishi, Kowalski, Koyama, Krause, Laverdiére, Miao, Nagatsuka, Oikawa, P. L. Gould, Park, Ricci, Rogers, Romstad, Saunders, Schiess, Thomsen, Wright, Yan, Yan   +27 more
core   +1 more source

Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing [PDF]

, 2014
Decoherence originates from the leakage of quantum information into external degrees of freedom. For a qubit the two main decoherence channels are relaxation and dephasing.
Ficheux, Q., Jezouin, S., Leghtas, Z., Huard, B.   +3 more
core   +4 more sources

ESPERDYNE: A dual‐band heterodyne monitor and ultrasound recorder for bioacoustic field surveys

Methods in Ecology and Evolution, EarlyView.
Abstract Background. Ultrasonic monitoring is essential for ecological studies of bats and other animals, yet high‐performance field devices remain prohibitively expensive and inaccessible—particularly in biodiversity‐rich regions with limited research infrastructure.
Ravi Umadi
wiley   +1 more source

Enhancement of Femtosecond Photon Echo Signals From an Inhomogeneously Broadened InAs Quantum Dot Ensemble Using Chirped Pulses

Nanophotonics, Volume 15, Issue 3, 12 February 2026.
Chirped rephasing pulses satisfying adiabatic conditions enable robust adiabatic rapid passage across a THz‐broadened InAs quantum dot ensemble. This approach provides uniform population inversion and broadband rephasing, overcoming the limitations of transform‐limited excitation.
Yuta Kochi, Yutaro Kinoshita, Masanari Watanabe, Ryutaro Ide, Kouichi Akahane, Junko Ishi‐Hayase   +5 more
wiley   +1 more source

Quantum Jumps in Amplitude Bistability: Tracking a Coherent and Invertible State Localization

Annalen der Physik, Volume 538, Issue 1, January 2026.
A notable asymmetry is shown to characterize the bistable switching between macroscopic metastable states of light in the strong‐coupling limit of radiation–matter interaction. Transitions from the vacuum to a highly excited state correlate with a highly bunched sequence of emitted photons, while a downward switch to the vacuum involves a coherent ...
Th. K. Mavrogordatos
wiley   +1 more source