Deep tissue applications (>1 cm) for photoacoustic imaging are limited for traditional Fabry-Perot (FP) ultrasound transducers interrogated by tightly focused Gaussian beams due to beam walk-off, but are in principle feasible for plano-concave optical microresonator (PCMR) sensors. However, in practice, making PCMR sensors with sufficiently high sensitivity is challenging. We explore several approaches to maximise sensitivity and overcome the limitations associated with using high-Q PCMR sensors. The results show an improvement in the sensitivity and the minimum detectable pressure, enabling an increase of the penetration depth in tomographic photoacoustic imaging.
We present dual DFB lasers each integrated with one heater developed in a generic foundry platform. The thermal effects are experimentally investigated and exhibited a continuous wavelength difference tuning of 0-12.33 nm.
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