Non-destructive measurements of the distributed gain in erbium doped fibers with improved accuracy using an optical frequency domain reflectometer

2002 ◽  
Author(s):  
M. Wegmuller ◽  
P. Oberson ◽  
O. Guinnard ◽  
B. Huttner ◽  
L. Guinnard ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Optical Frequency ◽  
Erbium Doped ◽  
Doped Fibers ◽  
Improved Accuracy ◽  
Non Destructive

Distributed gain measurements in Er-doped fibers with high resolution and accuracy using an optical frequency domain reflectometer

2000 ◽  
Vol 18 (12) ◽  
pp. 2127-2132 ◽  
Author(s):  
M. Wegmuller ◽  
P. Oberson ◽  
O. Guinnard ◽  
B. Huttner ◽  
L. Guinnard ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
Optical Frequency ◽  
Doped Fibers ◽  
Er Doped

scholarly journals A serial optical frequency-domain imaging study of early and late vascular responses to bioresorbable-polymer sirolimus-eluting stents for the treatment of acute myocardial infarction and stable coronary artery disease patients: results of the MECHANISM-ULTIMASTER study

2021 ◽  
Author(s):  
Tomonori Itoh ◽  
◽  
Hiromasa Otake ◽  
Takumi Kimura ◽  
Yoshiro Tsukiyama ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Frequency Domain ◽  
Stable Coronary Artery Disease ◽  
Imaging Study ◽  
Optical Frequency ◽  
Bioresorbable Polymer ◽  
Artery Disease

AbstractThe purpose of this study was to assess early and late vascular healing in response to bioresorbable-polymer sirolimus-eluting stents (BP-SESs) for the treatment of patients with ST-elevation myocardial infarction (STEMI) and stable coronary artery disease (CAD). A total of 106 patients with STEMI and 101 patients with stable-CAD were enrolled. Optical frequency-domain images were acquired at baseline, at 1- or 3-month follow-up, and at 12-month follow-up. In the STEMI and CAD cohorts, the percentage of uncovered struts (%US) was significantly and remarkably decreased during early two points and at 12-month (the STEMI cohort: 1-month: 18.75 ± 0.78%, 3-month: 10.19 ± 0.77%, 12-month: 1.80 ± 0.72%; p < 0.001, the CAD cohort: 1-month: 9.44 ± 0.78%, 3-month: 7.78 ± 0.78%, 12-month: 1.07 ± 0.73%; p < 0.001 respectively). The average peri-strut low-intensity area (PLIA) score in the STEMI cohort was significantly decreased during follow-up period (1.90 ± 1.14, 1.18 ± 1.25, and 1.01 ± 0.72; p ≤ 0.001), whereas the one in the CAD cohort was not significantly changed (0.89 ± 1.24, 0.67 ± 1.07, and 0.64 ± 0.72; p = 0.59). In comparison with both groups, differences of %US and PLIA score at early two points were almost disappeared or close at 12 months. The strut-coverage and healing processes in the early phase after BP-SES implantation were significantly improved in both cohorts, especially markedly in STEMI patients. At 1 year, qualitatively and quantitatively consistent neointimal coverage was achieved in both pathogenetic groups.

scholarly journals An Optical Frequency Domain Angle Measurement Method Based on Second Harmonic Generation

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 670
Author(s):  
Wijayanti Dwi Astuti ◽  
Hiraku Matsukuma ◽  
Masaru Nakao ◽  
Kuangyi Li ◽  
Yuki Shimizu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic Generation ◽  
Frequency Domain ◽  
Harmonic Generation ◽  
Measurement Method ◽  
Second Harmonic ◽  
Angle Measurement ◽  
Laser Source ◽  
Optical Frequency ◽  
Measurable Range

This paper proposes a new optical angle measurement method in the optical frequency domain based on second harmonic generation with a mode-locked femtosecond laser source by making use of the unique characteristic of the high peak power and wide spectral range of the femtosecond laser pulses. To get a wide measurable range of angle measurement, a theoretical calculation for several nonlinear optical crystals is performed. As a result, LiNbO3 crystal is employed in the proposed method. In the experiment, the validity of the use of a parabolic mirror is also demonstrated, where the chromatic aberration of the focusing beam caused the localization of second harmonic generation in our previous research. Moreover, an experimental demonstration is also carried out for the proposed angle measurement method. The measurable range of 10,000 arc-seconds is achieved.

scholarly journals Single Longitudinal Mode Lasers by Using Artificially Controlled Backscattering Erbium Doped Fibers

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 27428-27433
Author(s):  
Rosa Ana Perez-Herrera ◽  
Pablo Roldan-Varona ◽  
Luis Rodriguez Cobo ◽  
Jose Miguel Lopez-Higuera ◽  
Manuel Lopez-Amo
Keyword(s):  
Longitudinal Mode ◽  
Single Longitudinal Mode ◽  
Erbium Doped ◽  
Doped Fibers

Microball lens integrated fiber probe for optical frequency domain imaging

2011 ◽  
Vol 9 (9) ◽  
pp. 090608-90610 ◽  
Author(s):  
Jae-Ho Han Jae-Ho Han ◽  
J. U. Kang J. U. Kang
Keyword(s):  
Frequency Domain ◽  
Optical Frequency ◽  
Fiber Probe ◽  
Optical Frequency Domain Imaging

scholarly journals Comprehensive microscopy of the esophagus in human patients with optical frequency domain imaging

2008 ◽  
Vol 68 (4) ◽  
pp. 745-753 ◽  
Author(s):  
Melissa J. Suter ◽  
Benjamin J. Vakoc ◽  
Patrick S. Yachimski ◽  
Milen Shishkov ◽  
Gregory Y. Lauwers ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Optical Frequency ◽  
Optical Frequency Domain Imaging
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