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Proceedings Paper

Self-mixing laser velocimeter for retinal blood flow measurements
Author(s): Stefano Cattini; Giorgia Salvatori; Luigi Rovati
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Paper Abstract

A Doppler velocimeter exploiting a self-mixing laser diode is proposed. The system has been design to evaluate the retinal blood flow velocity. The central frequency of the Doppler band obtained from the self-mixing laser diode measurement is related to the blood flow velocity in the vessel under test. The measurement can be done under the light-intensity feedback ratio below -100 dB without using highly sensitive electronics since the laser acts as a high-efficiency mixer oscillator and a shot-noise-limited quantum detector. The advantages in adopting such technique consist in its low cost, easiness of implementation and small size. Moreover, the self-mixing laser diode method offers the advantage to have the excitation and measurement beams spatially overlapped overcoming the alignment difficulty due to limited optical accessibility imposed by the finite aperture of the pupil.

Paper Details

Date Published: 5 March 2007
PDF: 6 pages
Proc. SPIE 6426, Ophthalmic Technologies XVII, 642611 (5 March 2007); doi: 10.1117/12.700743
Show Author Affiliations
Stefano Cattini, Univ. of Modena and Reggio Emilia (Italy)
INFM (Italy)
Giorgia Salvatori, Univ. of Modena and Reggio Emilia (Italy)
INFM (Italy)
Luigi Rovati, Univ. of Modena and Reggio Emilia (Italy)
INFM (Italy)

Published in SPIE Proceedings Vol. 6426:
Ophthalmic Technologies XVII
Bruce E. Stuck; Fabrice Manns; Per G. Söderberg; Michael Belkin; Arthur Ho, Editor(s)

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