Fourier analysis of optical spectra for characterization of regimes in passively mode-locked fiber lasers

2020 ◽  
Author(s):  
Héctor G. Santiago-Hernández ◽  
David I. Serrano-García ◽  
Olivier Pottiez ◽  
Baldemar Ibarra-Escamilla ◽  
Jorge L. Flores Nuñez ◽  
...  
Keyword(s):  
Fourier Analysis ◽  
Fiber Lasers ◽  
Optical Spectra

scholarly journals Characterization of M dwarfs using optical mid-resolution spectra for exploration of small exoplanets

2020 ◽  
Author(s):  
Yohei Koizumi ◽  
Masayuki Kuzuhara ◽  
Masashi Omiya ◽  
Teruyuki Hirano ◽  
John Wisniewski ◽  
...  
Keyword(s):  
Sample Selection ◽  
Optical Spectra ◽  
Average Error ◽  
Spectral Energy ◽  
M Dwarfs ◽  
Energy Distributions ◽  
Fitting Procedures ◽  
Optical Region ◽  
Selection For

Abstract We present the optical spectra of 338 nearby M dwarfs, and compute their spectral types, effective temperatures (Teff), and radii. Our spectra were obtained using several optical spectrometers with spectral resolutions that range from 1200 to 10000. As many as 97% of the observed M-type dwarfs have a spectral type of M3–M6, with a typical error of 0.4 subtype, among which the spectral types M4–M5 are the most common. We infer the Teff of our sample by fitting our spectra with theoretical spectra from the PHOENIX model. Our inferred Teff is calibrated with the optical spectra of M dwarfs whose Teff have been well determined with the calibrations that are supported by previous interferometric observations. Our fitting procedures utilize the VO absorption band (7320–7570 Å) and the optical region (5000–8000 Å), yielding typical errors of 128 K (VO band) and 85 K (optical region). We also determine the radii of our sample from their spectral energy distributions. We find most of our sample stars have radii of <0.6 R⊙, with the average error being 3%. Our catalog enables efficient sample selection for exoplanet surveys around nearby M-type dwarfs.

Characterization of left atrial appendage Doppler flow in atrial fibrillation and flutter by Fourier analysis

1996 ◽  
Vol 132 (2) ◽  
pp. 286-296 ◽  
Author(s):  
Richard A. Grimm ◽  
Shalabh Chandra ◽  
Allan L. Klein ◽  
William J. Stewart ◽  
Ian W. Black ◽  
...  
Keyword(s):  
Atrial Fibrillation ◽  
Fourier Analysis ◽  
Left Atrial ◽  
Left Atrial Appendage ◽  
Atrial Appendage ◽  
Doppler Flow ◽  
Atrial Fibrillation And Flutter

scholarly journals Spectroscopic and structural characterization of barium tellurite glass fibers for mid-infrared ultra-broad tunable fiber lasers

2016 ◽  
Vol 6 (6) ◽  
pp. 2095 ◽  
Author(s):  
W. C. Wang ◽  
W. J. Zhang ◽  
L. X. Li ◽  
Y. Liu ◽  
D. D. Chen ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Fiber Lasers ◽  
Tellurite Glass ◽  
Glass Fibers ◽  
Mid Infrared
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