Dispersion compensation method based on focus definition evaluation functions for high-resolution laser frequency scanning interference measurement

2017 ◽  
Vol 386 ◽  
pp. 57-64 ◽  
Author(s):  
Liu Guodong ◽  
Xu Xinke ◽  
Liu Bingguo ◽  
Chen Fengdong ◽  
Hu Tao ◽  
...  
Keyword(s):  
High Resolution ◽  
Dispersion Compensation ◽  
Laser Frequency ◽  
Compensation Method ◽  
Evaluation Functions ◽  
Frequency Scanning ◽  
Interference Measurement

scholarly journals High-resolution laser frequency scanning interferometer based on fiber dispersion phase compensation

2015 ◽  
Vol 64 (21) ◽  
pp. 219501
Author(s):  
Xu Xin-Ke ◽  
Liu Guo-Dong ◽  
Liu Bing-Guo ◽  
Chen Feng-Dong ◽  
Zhuang Zhi-Tao ◽  
...  
Keyword(s):  
High Resolution ◽  
Laser Frequency ◽  
Phase Compensation ◽  
Dispersion Phase ◽  
Fiber Dispersion ◽  
Frequency Scanning ◽  
Scanning Interferometer

scholarly journals Tunable and compact dispersion compensation of broadband THz quantum cascade laser frequency combs

2019 ◽  
Vol 27 (15) ◽  
pp. 20231 ◽  
Author(s):  
Francesco P. Mezzapesa ◽  
Valentino Pistore ◽  
Katia Garrasi ◽  
Lianhe Li ◽  
A. Giles Davies ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Dispersion Compensation ◽  
Laser Frequency ◽  
Frequency Combs ◽  
Quantum Cascade

A Method of Dispersion Compensation Based on Warped Frequency Transform

2013 ◽  
Vol 718-720 ◽  
pp. 2062-2067 ◽  
Author(s):  
Shang Chen Fu ◽  
Zhen Jian Lv ◽  
Ding Ma ◽  
Li Hua Shi
Keyword(s):  
High Resolution ◽  
Velocity Dispersion ◽  
Lamb Waves ◽  
Group Velocity Dispersion ◽  
Dispersion Compensation ◽  
Imaging Method ◽  
Finite Element Software ◽  
Damage Imaging ◽  
Resolution Imaging ◽  
Multi Mode

The use of Lamb waves for structural health monitoring (SHM) has complicated by its multi-mode character and dispersion effect, which impacts the damage positioning and high-resolution imaging. The group velocity dispersion curves of Lamb waves can be employed to warp the frequency axis, and then to establish warped frequency transform (WFT) to process Lamb waves. In this paper, received signals are directly compensated with warped frequency transform to suppress dispersion, and a new imaging method is proposed based on warped frequency transform. The propagation of Lamb waves in damaged aluminum plate is simulated by finite element software ABAQUS, results show that warped frequency transform can effectively compensate dispersive wave-packets, and high-resolution damage imaging can be obtained by the proposed method.

Frequency combs and precision spectroscopy of atomic hydrogen

2019 ◽  
pp. 142-215
Author(s):  
Thomas Udem
Keyword(s):  
High Resolution ◽  
Visible Light ◽  
Laser Spectroscopy ◽  
Quantum Electrodynamics ◽  
Atomic Hydrogen ◽  
Frequency Comb ◽  
Atomic Clock ◽  
Laser Frequency ◽  
High Resolution Spectroscopy ◽  
Frequency Combs

A laser frequency comb allows the phase coherent conversion of the very rapid oscillations of visible light of some 100s of THz down to frequencies that can be handled with conventional electronics. This capability has enabled the most precise laser spectroscopy experiments yet, which have allowed the testing of quantum electrodynamics, to determine fundamental constants and to construct an optical atomic clock. The chapter reviews the development of the frequency comb, derives its properties, and discusses its application for high resolution spectroscopy of atomic hydrogen.

Astronomical Laser Frequency Comb for High Resolution Spectrograph of a 2.16-m Telescope

2016 ◽  
Vol 36 (6) ◽  
pp. 0614001 ◽  
Author(s):  
吴元杰 Wu Yuanjie ◽  
叶慧琪 Ye Huiqi ◽  
韩建 Han Jian ◽  
邹璞 Zou Pu ◽  
傅凌统 Fu Lingtong ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Comb ◽  
Laser Frequency
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