temporal coherence
Recently Published Documents


TOTAL DOCUMENTS

641
(FIVE YEARS 83)

H-INDEX

44
(FIVE YEARS 3)

2021 ◽  
pp. 39-45
Author(s):  
M. Françon ◽  
N. Krauzman ◽  
J.P. Mathieu ◽  
M. May

2021 ◽  
Vol 127 (25) ◽  
Author(s):  
Antti J. Moilanen ◽  
Konstantinos S. Daskalakis ◽  
Jani M. Taskinen ◽  
Päivi Törmä

2021 ◽  
Author(s):  
Henri Atte Pesonen ◽  
Juha-Matti Huusko ◽  
Xiaorun Zang ◽  
Ari T Friberg ◽  
Jari Turunen ◽  
...  

Abstract We study the spectral and temporal coherence effects in the passage of a Gaussian Schell-model (GSM) scalar, plane-wave pulse train through a slab of nonlinear optical crystal exhibiting second-harmonic generation. We show that due to the nonlinear interaction the temporal and spectral degrees of coherence of the fundamental (F) and second-harmonic (SH) pulse trains at the exit facet may deviate markedly from the GSM and the global degree of coherence of the SH wave generally decreases with increasing incident F beam intensity. In addition, we find that due to the partial coherence of the incident GSM field the transmitted SH wave may show a double-peaked intensity distribution.


Metrology ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 122-141
Author(s):  
Peter Lehmann ◽  
Sebastian Hagemeier ◽  
Tobias Pahl

Three-dimensional transfer functions (3D TFs) are generally assumed to fully describe the transfer behavior of optical topography measuring instruments such as coherence scanning interferometers in the spatial frequency domain. Therefore, 3D TFs are supposed to be independent of the surface under investigation resulting in a clear separation of surface properties and transfer characteristics. In this paper, we show that the 3D TF of an interference microscope differs depending on whether the object is specularly reflecting or consists of point scatterers. In addition to the 3D TF of a point scatterer, we will derive an analytical expression for the 3D TF corresponding to specular surfaces and demonstrate this as being most relevant in practical applications of coherence scanning interferometry (CSI). We additionally study the effects of temporal coherence and disclose that in conventional CSI temporal coherence effects dominate. However, narrowband light sources are advantageous if high spatial frequency components of weak phase objects are to be resolved, whereas, for low-frequency phase objects of higher amplitude, the temporal coherence is less affecting. Finally, we present an approach that explains the different transfer characteristics of coherence peak and phase detection in CSI signal analysis.


2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hangyong Shan ◽  
Lukas Lackner ◽  
Bo Han ◽  
Evgeny Sedov ◽  
Christoph Rupprecht ◽  
...  

AbstractThe emergence of spatial and temporal coherence of light emitted from solid-state systems is a fundamental phenomenon intrinsically aligned with the control of light-matter coupling. It is canonical for laser oscillation, emerges in the superradiance of collective emitters, and has been investigated in bosonic condensates of thermalized light, as well as exciton-polaritons. Our room temperature experiments show the strong light-matter coupling between microcavity photons and excitons in atomically thin WSe2. We evidence the density-dependent expansion of spatial and temporal coherence of the emitted light from the spatially confined system ground-state, which is accompanied by a threshold-like response of the emitted light intensity. Additionally, valley-physics is manifested in the presence of an external magnetic field, which allows us to manipulate K and K’ polaritons via the valley-Zeeman-effect. Our findings validate the potential of atomically thin crystals as versatile components of coherent light-sources, and in valleytronic applications at room temperature.


2021 ◽  
Author(s):  
Hideo Ando ◽  
Junihiro Ukon ◽  
Toshiaki Iwai ◽  
Izumi Nishidate

2021 ◽  
Vol 150 (4) ◽  
pp. A336-A336
Author(s):  
Matthew J. Kamrath ◽  
Vladimir Ostashev ◽  
D. Keith Wilson ◽  
Michael J. White ◽  
Carl R. Hart ◽  
...  
Keyword(s):  

Sign in / Sign up

Export Citation Format

Share Document