Calibration of optical spectrum analyzers

Most theoretical models of the AM Her variables (AM Her, AN UMa, W Pup and 2A0311-22) rely on strong cyclotron emission at the fundamental cyclotron frequency and higher harmonics to produce the observed, strongly-polarized optical continuum (e.g. Lamb and Masters 1979). The cyclotron lines, which presumably originate in the hot, isothermal accretion shock at the surface of the white dwarf (kT ≳ 10 keV, h/R* ≲ 0.1), should be blurred into a continuous spectrum by both optical depth effects and electron Doppler broadening. Thus the lack of even weak cyclotron features in the optical spectra of these objects is still compatible with a cyclotron origin.

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Influences of optical-spectrum errors on excess relative intensity noise in a fiber-optic gyroscope

Optics Communications ◽

10.1016/j.optcom.2017.10.037 ◽

2018 ◽

Vol 410 ◽

pp. 504-513 ◽

Cited By ~ 6

Author(s):

Yue Zheng ◽

Chunxi Zhang ◽

Lijing Li

Keyword(s):

Relative Intensity ◽

Optical Spectrum ◽

Fiber Optic ◽

Relative Intensity Noise ◽

Intensity Noise ◽

Fiber Optic Gyroscope

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ELECTRONIC STRUCTURE AND OPTICAL PROPERTIES OF CRYSTALLINE C60

Modern Physics Letters B ◽

10.1142/s0217984992000399 ◽

1992 ◽

Vol 06 (06) ◽

pp. 309-321 ◽

Cited By ~ 6

Author(s):

W.Y. CHING ◽

MING-ZHU HUANG ◽

YONG-NIAN XU ◽

FANQI GAN

Keyword(s):

Optical Properties ◽

Electronic Structure ◽

First Principles ◽

Optical Spectrum ◽

Local Density ◽

Low Dielectric Constant ◽

Experimental Measurements ◽

Absorption Bands ◽

Low Dielectric ◽

Good Agreement

The electronic structure and optical properties of crystalline C 60 and their pressure dependence have been studied by first-principles local density calculations. It is shown that fcc C 60 has a low dielectric constant and an optical spectrum rich in structures. The spectrum shows five disconnected absorption bands in the 1.4 to 7.0 eV region with sharp structures in each band that can be attributed to critical point transitions. This is a manifestation of the localized molecular structure coupled with long range crystalline order unique to the C 60 crystal. At a sufficient high pressure, the structures in the optical spectrum start to merge due to the merging of the bands. These results are in good agreement with some recent experimental measurements.

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