Thermal and Temporal characteristics of the Faraday Anomalous Dispersion Optical Filters Based on Hollow Cathode Lamps

2021 ◽  
Author(s):  
Bin Luo ◽  
rui ma ◽  
qianqian Ji ◽  
Longfei Yin ◽  
Jingbiao Chen ◽  
...  
Keyword(s):  
Hollow Cathode ◽  
Optical Filters ◽  
Anomalous Dispersion ◽  
Temporal Characteristics

scholarly journals A Faraday Anomalous Dispersion Optical Filter Based on Rubidium Hollow-Cathode Lamp

2020 ◽  
Vol 10 (20) ◽  
pp. 7075
Author(s):  
Liang Shen ◽  
Rui Ma ◽  
Longfei Yin ◽  
Bin Luo ◽  
Duo Pan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hollow Cathode ◽  
Room Temperature ◽  
Saturated Vapor ◽  
Optical Filter ◽  
Optical Filters ◽  
Anomalous Dispersion ◽  
Narrow Linewidth ◽  
Hollow Cathode Lamp ◽  
Lower Temperature

Using a hollow-cathode lamp (HCL) to build a Faraday anomalous dispersion optical filter (FADOF) is a new method to realize narrow linewidth optical filters. In contrast to other atomic optical filters based on saturated vapors, which work at a relatively high temperature to maintain the atomic density, the HCL device using sputtered particles can work at a much lower temperature. In this work, a rubidium HCL-based FADOF (HCL-FADOF) working at 780 nm is established and carefully tested. With 20 mm cathode length, the transmittance can reach 29% under 18 mA discharge current and 260 G magnetic field at room temperature, which is equivalent to the performance of a saturated vapor-based FADOF (VC-FADOF) at more than 60 ∘C. This work provides a direct comparison of the performance of the HCL-FADOF and the VC-FADOF, which is of great benefit to further studies of atomic filters at normal temperature.

scholarly journals Hollow cathode lamp based Faraday anomalous dispersion optical filter

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Duo Pan ◽  
Xiaobo Xue ◽  
Haosen Shang ◽  
Bin Luo ◽  
Jingbiao Chen ◽  
...  
Keyword(s):  
Hollow Cathode ◽  
Optical Filter ◽  
Anomalous Dispersion ◽  
Hollow Cathode Lamp

Temporal characteristics of narrow-band optical filters and their application in lidar systems

1997 ◽  
Vol 22 (6) ◽  
pp. 414 ◽  
Author(s):  
Guangning Yang ◽  
Richard I. Billmers ◽  
Peter R. Herczfeld ◽  
Vincent M. Contarino
Keyword(s):  
Narrow Band ◽  
Optical Filters ◽  
Temporal Characteristics

Excited state Faraday anomalous dispersion optical filters based on indirect laser pumping

2014 ◽  
Vol 39 (4) ◽  
pp. 842 ◽  
Author(s):  
Longfei Yin ◽  
Bin Luo ◽  
Zhongjie Chen ◽  
Lei Zhong ◽  
Hong Guo
Keyword(s):  
Excited State ◽  
Optical Filters ◽  
Anomalous Dispersion ◽  
Laser Pumping

Temporal Characteristics of Speech in Simultaneous Communication

1995 ◽  
Vol 38 (5) ◽  
pp. 1014-1024 ◽  
Author(s):  
Robert L. Whitehead ◽  
Nicholas Schiavetti ◽  
Brenda H. Whitehead ◽  
Dale Evan Metz
Keyword(s):  
Pause Duration ◽  
Vowel Duration ◽  
Vowel Perception ◽  
Temporal Characteristics ◽  
Spoken English ◽  
Temporal Features ◽  
Before And After ◽  
Word Duration ◽  
Rate Of Speech ◽  
Speech Condition

The purpose of this investigation was twofold: (a) to determine if there are changes in specific temporal characteristics of speech that occur during simultaneous communication, and (b) to determine if known temporal rules of spoken English are disrupted during simultaneous communication. Ten speakers uttered sentences consisting of a carrier phrase and experimental CVC words under conditions of: (a) speech, (b) speech combined with signed English, and (c) speech combined with signed English for every word except the CVC word that was fingerspelled. The temporal features investigated included: (a) sentence duration, (b) experimental CVC word duration, (c) vowel duration in experimental CVC words, (d) pause duration before and after experimental CVC words, and (e) consonantal effects on vowel duration. Results indicated that for all durational measures, the speech/sign/fingerspelling condition was longest, followed by the speech/sign condition, with the speech condition being shortest. It was also found that for all three speaking conditions, vowels were longer in duration when preceding voiced consonants than vowels preceding their voiceless cognates, and that a low vowel was longer in duration than a high vowel. These findings indicate that speakers consistently reduced their rate of speech when using simultaneous communication, but did not violate these specific temporal rules of English important for consonant and vowel perception.

Linewidth and anomalous dispersion of ultrasound in glasses

1977 ◽  
Vol 38 (1) ◽  
pp. 69-78 ◽  
Author(s):  
A. Bachellerie ◽  
P. Doussineau ◽  
A. Levelut ◽  
T.-T. Ta
Keyword(s):  
Anomalous Dispersion

TEMPERATURE OF HEAVY-CURRENT CYLINDRICAL HOLLOW CATHODE

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-229-C7-230
Author(s):  
N. N. Rykalin ◽  
A. V. Nikolaev ◽  
A. P. Borzhov
Keyword(s):  
Hollow Cathode ◽  
Cylindrical Hollow Cathode
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