Takashi Buma

TL;DR: In this article, the authors used the thermoelastic effect to produce high-frequency, broadband ultrasound in water, where a pulsed diode laser followed by an erbium-doped fiber amplifier, was focused onto a light absorbing film deposited on a glass substrate.

TL;DR: A different form of optical detection demonstrating improved sensitivity and offering a potentially simple method for constructing two-dimensional arrays is explored, confirming that the sensitivity of etalon detection is comparable with piezoelectric detection.

TL;DR: In this paper, an optical technique for ultrasound detection based on a thin (10μm) Fabry-Perot etalon optimized for high-resolution imaging is described, where the signal to noise ratio (SNR) approaches that of an ideal piezoelectric transducer over a 100MHz bandwidth.

TL;DR: In this article, the authors present a technique of high-dynamic-range plasma-shuttered streak camera contrast measurement, as well as two efficient and relatively inexpensive ways of improving the contrast of short pulse lasers without sacrificing on the output energy: a double-pass Pockels cell (PC) and clean high-energy pulse seeding of the regenerative amplifier.

TL;DR: This work proposes a more reliable biometric technology using spectral domain optical coherence tomography (SD-OCT) to image the subsurface of a fingertip and demonstrates high repeatability in clearly visualizing the distribution of sweat (eccrine) glands in live fingertips.