New kind of spectral analysis instrument for measuring time-resolved spectrum of single-pulse light

1998 ◽  
Author(s):  
Jingguo Yang ◽  
Cangli Yang ◽  
Yuanqian Ha ◽  
Xiaobo Chen ◽  
Lihong Jin ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Single Pulse ◽  
Measuring Time ◽  
Time Resolved ◽  
Pulse Light ◽  
Analysis Instrument

scholarly journals Time-resolved GRB polarization with POLAR and GBM

2019 ◽  
Vol 627 ◽  
pp. A105 ◽  
Author(s):  
J. M. Burgess ◽  
M. Kole ◽  
F. Berlato ◽  
J. Greiner ◽  
G. Vianello ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Single Pulse ◽  
Current Data ◽  
Gamma Ray Bursts ◽  
Polarization Angle ◽  
Analysis Pipeline ◽  
Time Resolved ◽  
Polarization Models ◽  
Probabilistic Context ◽  
Prompt Emission

Context. Simultaneousγ-ray measurements ofγ-ray burst spectra and polarization offer a unique way to determine the underlying emission mechanism(s) in these objects, as well as probing the particle acceleration mechanism(s) that lead to the observedγ-ray emission.Aims. We examine the jointly observed data from POLAR andFermi-GBM of GRB 170114A to determine its spectral and polarization properties, and seek to understand the emission processes that generate these observations. We aim to develop an extensible and statistically sound framework for these types of measurements applicable to other instruments.Methods. We leveraged the existing3MLanalysis framework to develop a new analysis pipeline for simultaneously modeling the spectral and polarization data. We derived the proper Poisson likelihood forγ-ray polarization measurements in the presence of background. The developed framework is publicly available for similar measurements with otherγ-ray polarimeters. The data are analyzed within a Bayesian probabilistic context and the spectral data from both instruments are simultaneously modeled with a physical, numerical synchrotron code.Results. The spectral modeling of the data is consistent with a synchrotron photon model as has been found in a majority of similarly analyzed single-pulse gamma-ray bursts. The polarization results reveal a slight trend of growing polarization in time reaching values of ∼30% at the temporal peak of the emission. We also observed that the polarization angle evolves with time throughout the emission. These results suggest a synchrotron origin of the emission but further observations of many GRBs are required to verify these evolutionary trends. Furthermore, we encourage the development of time-resolved polarization models for the prompt emission of gamma-ray bursts as the current models are not predictive enough to enable a full modeling of our current data.

scholarly journals Time-resolved spectral analysis of the pulsating helium star V652 Her

2001 ◽  
Vol 376 (2) ◽  
pp. 497-517 ◽  
Author(s):  
C. S. Jeffery ◽  
V. M. Woolf ◽  
D. L. Pollacco
Keyword(s):  
Spectral Analysis ◽  
Time Resolved ◽  
Helium Star

New method for measuring time-resolved spectra of lanthanide emission using square-wave excitation

2013 ◽  
Vol 84 (11) ◽  
pp. 113106 ◽  
Author(s):  
Feng Qin ◽  
Hua Zhao ◽  
Qianqian Duan ◽  
Wei Cai ◽  
Zhiguo Zhang ◽  
...  
Keyword(s):  
New Method ◽  
Wave Excitation ◽  
Measuring Time ◽  
Time Resolved ◽  
Square Wave

Femtosecond Spectroscopy of Ferroelectric Perovskites: Explanation of Anomalous Polariton Dynamics in Lithium Tantalate

1992 ◽  
Vol 293 ◽  
Author(s):  
Gary P. Wiederrecht ◽  
T. P. Dougherty ◽  
L. Dhar ◽  
K. A. Nelson
Keyword(s):  
Pulse Shaping ◽  
Stimulated Raman Scattering ◽  
Single Pulse ◽  
Lithium Tantalate ◽  
Pulse Excitation ◽  
Vibrational Modes ◽  
Temperature Dependent ◽  
Time Resolved ◽  
Optical Pulse Shaping ◽  
Impulsive Stimulated Raman Scattering

AbstractTime resolved impulsive stimulated Raman scattering (ISRS) is used to characterize the lowest frequency A1 phonon-polariton mode in lithium tantalate. The anomalously high and wavevector-dependent damping rates observed are explained in terms of coupling of the polariton to a weakly Raman-active relaxational mode and to two heavily damped vibrational modes. The dynamics of the relaxational mode are explored further through temperature dependent ISRS studies. Femtosecond optical pulse shaping is used for multiple pulse ISRS at temperatures lower than 120K where single pulse excitation led to photorefractive damage.

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