Novel optical feedback scheme for the improvement of the wavelength switching behaviour of tunable lasers

2003 ◽  
Author(s):  
B. Moeyersoon ◽  
G. Morthier ◽  
R. Baets
Keyword(s):  
Optical Feedback ◽  
Tunable Lasers ◽  
Wavelength Switching ◽  
Switching Behaviour ◽  
Feedback Scheme

scholarly journals Influence of Integrated Optical Feedback on Tunable Lasers

2020 ◽  
Vol 56 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Magnus Happach ◽  
Martin Mohrle ◽  
Norbert Keil ◽  
Werner Hofmann ◽  
Martin Schell ◽  
...  
Keyword(s):  
Optical Feedback ◽  
Tunable Lasers ◽  
Integrated Optical

scholarly journals Very steep optical thresholding Characteristic using a DFB laser diode and an SOA in an optical feedback scheme

2005 ◽  
Vol 17 (3) ◽  
pp. 642-644 ◽  
Author(s):  
W. D'Oosterlinck ◽  
G. Morthier ◽  
M.K. Smit ◽  
R. Baets
Keyword(s):  
Laser Diode ◽  
Optical Feedback ◽  
Feedback Scheme ◽  
Dfb Laser

Actively stabilized optical feedback scheme for very stable, high sensitivity shear-force measurement

2003 ◽  
Vol 74 (8) ◽  
pp. 3664-3669
Author(s):  
Heeseong Jeong ◽  
Noh-Min Kwak ◽  
Hyeongjun Huh ◽  
Kyuman Cho
Keyword(s):  
Shear Force ◽  
Optical Feedback ◽  
Force Measurement ◽  
High Sensitivity ◽  
Feedback Scheme

Wavelength Switching Speed in Semiconductor Ring Lasers With On-Chip Filtered Optical Feedback

2014 ◽  
Vol 26 (5) ◽  
pp. 520-523 ◽  
Author(s):  
Mulham Khoder ◽  
Romain Modeste Nguimdo ◽  
Xaveer Leijtens ◽  
Jeroen Bolk ◽  
Jan Danckaert ◽  
...  
Keyword(s):  
Optical Feedback ◽  
Switching Speed ◽  
Wavelength Switching ◽  
Ring Lasers ◽  
On Chip ◽  
Semiconductor Ring Lasers

scholarly journals Optical Feedback for Sensitivity Enhancement in Direct Raman Detection of Liquids

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Miao Liu ◽  
Yunyun Mu ◽  
Jingyun Hu ◽  
Jiajun Li ◽  
Xinping Zhang
Keyword(s):  
Raman Scattering ◽  
High Efficiency ◽  
Optical Feedback ◽  
Laser Energy ◽  
Raman Signal ◽  
Detection Scheme ◽  
Liquid Samples ◽  
Feedback Scheme ◽  
Excitation Laser ◽  
Scattering Light

Detection of low-concentration molecules in liquids has been a challenge in sensing technologies. Raman spectroscopy is an effective approach for trace detection, which is in fact a “volume-excitation” and “volume-collection” technique in the analysis of liquid samples. However, for the commonly employed one-pass excitation and back-scattering detection scheme, a large portion of both the excitation laser energy and the Raman-scattering light energy is wasted without efficient reuse or collection. In this consideration, we demonstrate a broadband optical feedback scheme by a curved high-reflection mirror for both the excitation and the Raman-scattering light, so that the excitation and the forward-propagating Raman signal can be back-reflected and collected with a high efficiency. Using the “F+2f” design, where F and f are the focal lengths of the focusing lens and curved reflection mirror, respectively, we were able to not only produce two focuses of the excitation laser beam but also extend the Raman interaction by a doubled distance. For the detection of pure ethanol molecules and the R6G molecules in water with a concentration of 10−3 M, the Raman signal was enhanced by a factor of about 5.6. The optical feedback scheme and discovered optical mechanisms supply effective improvements to the Raman spectroscopic measurements on liquid samples.

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