Coherent Single-Mode Extraction of Agile Frequency Comb via Phase-Locking for Broadband Phase-Continuous Tuning

2017 ◽  
Author(s):  
Weilin Xie ◽  
Yi Dong ◽  
Fabien Bretenaker ◽  
Hongxiao Shi ◽  
Qian Zhou ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Phase Locking ◽  
Single Mode ◽  
Continuous Tuning ◽  
Mode Extraction

scholarly journals Coherent control of acoustic phonons in a silica fiber using a multi-GHz optical frequency comb

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Mamoru Endo ◽  
Shota Kimura ◽  
Shuntaro Tani ◽  
Yohei Kobayashi
Keyword(s):  
Coherent Control ◽  
Continuous Wave ◽  
Frequency Comb ◽  
Effective Interaction ◽  
Interaction Strength ◽  
Single Mode ◽  
Optical Frequency Comb ◽  
Material Structure ◽  
Optical Frequency ◽  
Acoustic Phonons

AbstractMulti-gigahertz mechanical vibrations that stem from interactions between light fields and matter—known as acoustic phonons—have long been a subject of research. In recent years, specially designed functional devices have been developed to enhance the strength of the light-matter interactions because excitation of acoustic phonons using a continuous-wave laser alone is insufficient. However, the strength of the interaction cannot be controlled appropriately or instantly using these structurally-dependent enhancements. Here we show a technique to control the effective interaction strength that does not operate via the material structure in the spatial domain; instead, the method operates through the structure of the light in the time domain. The effective excitation and coherent control of acoustic phonons in a single-mode fiber using an optical frequency comb that is performed by tailoring the optical pulse train. This work represents an important step towards comb-matter interactions.

scholarly journals Controlling and Phase‐Locking a THz Quantum Cascade Laser Frequency Comb by Small Optical Frequency Tuning

2021 ◽  
pp. 2000417
Author(s):  
Luigi Consolino ◽  
Annamaria Campa ◽  
Michele De Regis ◽  
Francesco Cappelli ◽  
Giacomo Scalari ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Frequency Tuning ◽  
Frequency Comb ◽  
Phase Locking ◽  
Laser Frequency ◽  
Optical Frequency ◽  
Quantum Cascade

Radar target discrimination by convolution of radar return with extinction-pulses and single-mode extraction signals

1986 ◽  
Vol 34 (7) ◽  
pp. 896-904 ◽  
Author(s):  
Kun-Mu Chen ◽  
D. Nyquist ◽  
E. Rothwell ◽  
L. Webb ◽  
B. Drachman
Keyword(s):  
Single Mode ◽  
Radar Target ◽  
Target Discrimination ◽  
Mode Extraction

Frequency comb seeding of a single-mode near-infrared semiconductor laser

2021 ◽  
Author(s):  
Jan Lautenschläger ◽  
Dominik Auth ◽  
Christoph Weber ◽  
Leonhard Wegert ◽  
Dmitry Kazakov ◽  
...  
Keyword(s):  
Semiconductor Laser ◽  
Near Infrared ◽  
Frequency Comb ◽  
Single Mode

scholarly journals Research on a Rail Defect Location Method Based on a Single Mode Extraction Algorithm

2019 ◽  
Vol 9 (6) ◽  
pp. 1107 ◽  
Author(s):  
Bo Xing ◽  
Zujun Yu ◽  
Xining Xu ◽  
Liqiang Zhu ◽  
Hongmei Shi
Keyword(s):  
Finite Element ◽  
Guided Waves ◽  
Single Mode ◽  
Dispersion Curves ◽  
Modal Identification ◽  
Propagation Time ◽  
Location Method ◽  
Defect Location ◽  
Extraction Algorithm ◽  
Mode Extraction

This paper proposes a rail defect location method based on a single mode extraction algorithm (SMEA) of ultrasonic guided waves. Simulation analysis and verification were conducted. The dispersion curves of a CHN60 rail were obtained using the semi-analytical finite element method, and the modal data of the guided waves were determined. According to the inverse transformation of the excitation response algorithm, modal identification under low-frequency and high-frequency excitation was realized, and the vibration displacements at other positions of a rail were successfully predicted. Furthermore, an SMEA for guided waves is proposed, through which the single extraction results of four modes were successfully obtained when the rail was excited along different excitation directions at a frequency of 200 Hz. In addition, the SMEA was applied to defect location detection, and the single reflection mode waveform of the defect was extracted. Based on the group velocity of the mode and its propagation time, the distance between the defect and the excitation point was measured, and the defect location was predicted as a result. Moreover, the SMEA was applied to locate the railhead defect. The detection mode, the frequency, and the excitation method Were selected through the dispersion curves and modal identification results, and a series of signals of the sampling nodes were obtained using the three-dimensional finite element software ANSYS. The distance between the defect and the excitation point was calculated using the SMEA result. When compared with the structure of the simulated model, the errors obtained were all less than 0.5 m, proving the efficacy of this method in precisely locating rail defects, thus providing an innovated solution for rail defect location.

A new mechanism of phase locking in a single-mode laser

2000 ◽  
Vol 275 (3) ◽  
pp. 223-227 ◽  
Author(s):  
Li Cao ◽  
Da-jin Wu
Keyword(s):  
Phase Locking ◽  
Single Mode ◽  
Mode Laser ◽  
Single Mode Laser

Identification of aerodynamic derivatives of bridge decks at high testing wind speed

2018 ◽  
Vol 45 (11) ◽  
pp. 1004-1014
Author(s):  
Quanshun Ding ◽  
Shuanghu Dong ◽  
Zhiyong Zhou
Keyword(s):  
Wind Speed ◽  
Wind Tunnel Test ◽  
Participation Rate ◽  
Single Mode ◽  
High Wind ◽  
Wind Speeds ◽  
Aerodynamic Derivatives ◽  
Vibration Responses ◽  
Mode Extraction ◽  
Derivatives Of

An identification of eight aerodynamic derivatives based on dual-mode and single-mode extraction of system is presented to improve the applicability and accuracy of identification at high testing wind speed. The participation rate to measure the contribution of modes on free-vibration responses is defined and the single-mode extraction is presented to extract the modal parameters of the system at high wind speed. To verify the reliability and applicability of the presented method, the aerodynamic derivatives of a dummy section with known self-excited forces are identified. It is noted that there is a very good agreement between the identified results and the target ones in the range of the low and high wind speeds and the presented method works well after the critical state of flutter. The sectional wind tunnel test of the Tanggu-haihe bridge is performed to identify the aerodynamic derivatives of the deck at the attack angles of −3°, 0°, and 3°.

Optical frequency comb generation for DWDM transmission over 25- to 50-km standard single-mode fiber

2018 ◽  
Vol 57 (01) ◽  
pp. 1 ◽  
Author(s):  
Rahat Ullah ◽  
Liu Bo ◽  
Mao Yaya ◽  
Sibghat Ullah ◽  
Muhammad Saad Khan ◽  
...  
Keyword(s):  
Frequency Comb ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Optical Frequency Comb ◽  
Optical Frequency ◽  
Comb Generation
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