Cette conférence fait partie des conférences SPIE Photonics Europe qi se tiendra du 3 au 7 avril 2016 à Bruxelles en Belgique.
(Paper #: 9887-85).
Portable multiwavelength laser diode source for handheld photoacoustic devices
Paper 9887-85
Auteurs: Céline Canal, Arnaud Laugustin, Andreas Kohl, Olivier Rabot, Quantel (France)
Abstract:
The
ageing population faces today an increase of chronic diseases such as
rheumatism/arthritis, cancer and cardio vascular diseases for which
appropriate treatments based on a diagnosis at an early-stage of the
disease are required. Some imaging techniques are already available in
order to get structural information. Within the non-invasive group,
ultrasound (US) images are common in these fields of medicine. However,
there is a need for a point-of-care device for imaging smaller
structures such as blood vessels that cannot be observed with purely
ultrasound based devices. Photoacoustics proved to be an attractive
candidate. This novel imaging technique combines pulsed laser light for
excitation of tissues and an US transducer as a receptor. Up to now
laser sources for existing photoacoustic systems were mainly Nd:YAG
lasers or optical parametric oscillators (OPO). In that context, QUANTEL
is about to take up the challenge of drastically shrinking the size of
these expensive and bulky nanosecond lasers by demonstrating ultra-short
pulse emission (30 - 100 ns) with highly efficient laser diodes (LD) in
the near-infrared range. Such a laser source is the key for the
introduction of photoacoustic technology for point-of-care testing.
It will be demonstrated that a laser source as small as a hand,
including an innovative LD and its patented driver board, can be
integrated into high sensitivity photoacoustic systems. Thanks to highly
performant diode bars, emission of 1 mJ was achieved from an emitting
surface that can be as small as 5 mm x 1 mm, which could even allow to
couple into an optical fiber with simple optical elements. Besides,
several wavelengths between 805 and 980 nm can be generated from a
single LD, then allowing to adjust the wavelength according to targeted
tissue components (blood, fat…). This state-of-the-art laser source
presents an outstanding electrical-to-optical efficiency of about 30 %;
which enables operation without cooling up to 2 W average power.
Pour + d'informations:http://spie.org/EPE/conferencedetails/biophotonics-photonic-solutions#2227107