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Proceedings Paper

Combining high power diode lasers using fiber bundles for beam delivery in optoacoustic endoscopy applications
Author(s): Sandeep Babu Gawali; Luca Leggio; Miguel Sánchez; Sergio Rodríguez; Ehsan Dadrasnia; Daniel C. Gallego; Horacio Lamela
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Paper Abstract

Optoacoustic (OA) effect refers to the generation of the acoustic waves due to absorption of light energy in a biological tissue. The incident laser pulse is absorbed by the tissue, resulting in the generation of ultrasound that is typically detected by a piezoelectric detector. Compared to other techniques, the advantage of OA imaging (OAI) technique consists in combining the high resolution of ultrasound technique with the high contrast of optical imaging. Generally, Nd:YAG and OPO systems are used for the generation of OA waves but their use in clinical environment is limited for many aspects. On the other hand, high-power diode lasers (HPDLs) emerge as potential alternative. However, the power of HPDLs is still relatively low compared to solid-state lasers. We show a side-by-side combination of several HPDLs in an optical fiber bundle to increase the amount of power for OA applications. Initially, we combine the output optical power of several HPDLs at 905 nm using two 7 to 1 round optical fiber bundles featuring a 675 μm and 1.2 mm bundle aperture. In a second step, we couple the output light of these fiber bundles to a 600 μm core diameter endoscopic fiber, reporting the corresponding coupling efficiencies. The fiber bundles with reasonable small diameter are likely to be used for providing sufficient light energy to potential OA endoscopy (OAE) applications.

Paper Details

Date Published: 9 May 2016
PDF: 7 pages
Proc. SPIE 9892, Semiconductor Lasers and Laser Dynamics VII, 98921W (9 May 2016); doi: 10.1117/12.2227697
Show Author Affiliations
Sandeep Babu Gawali, Univ. Carlos III de Madrid (Spain)
Luca Leggio, Univ. Carlos III de Madrid (Spain)
Miguel Sánchez, Univ. Carlos III de Madrid (Spain)
Sergio Rodríguez, Univ. Carlos III de Madrid (Spain)
Ehsan Dadrasnia, Univ. Carlos III de Madrid (Spain)
Daniel C. Gallego, Univ. Carlos III de Madrid (Spain)
Horacio Lamela, Univ. Carlos III de Madrid (Spain)

Published in SPIE Proceedings Vol. 9892:
Semiconductor Lasers and Laser Dynamics VII
Krassimir Panajotov; Marc Sciamanna; Angel Valle; Rainer Michalzik, Editor(s)

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