Acousto-optically tuned external-cavity laser diode for optical coherence tomography with continuous wavelet transform

Suzuki, Takamasa; Sugawara, Nariyasu; Choi, Samuel; Sasaki, Osami

doi:10.1117/1.oe.58.10.104108

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Therefore, in applications focused on biomedical imaging requiring light penetration beyond the optical diffusion limit (up to 1 mm) and high spectral image resolution (<50 µm (Xia et al, 2014), diode laser sources are often selected among the currently available technologies. Hence, they are becoming increasingly popular for biomedical imaging applications, such as photoacoustic tomography (PAT) and endoscopy (PAE) (Xia et al, 2014;Gawali et al, 2016), optical coherence tomography (OCT) (Chen et al, 2017;Suzuki et al, 2019), and diffuse optical imaging (DOI) (Zhang, 2013). The quasi-diffusive and ballistic effects that occur in highly scattering tissues introduce the main limitations in the spatial resolution and depth of imaging applications, requiring a higher contribution of optical power to achieve high penetration depths.…”

Section: Introductionmentioning

confidence: 99%

Beam-shaping design for multi-wavelength diode laser stack system coupled into optical fiber for biomedical applications

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Beam-shaping design for multi-wavelength diode laser stack system coupled into optical fiber for biomedical applications

et al. 2021

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Linear-wavenumber swept source based on an acousto-optic device for optical coherence tomography

Ji,

Suzuki,

Choi

et al. 2023

Opt. Express

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Linear-wavenumber swept-source optical coherence tomography (SS-OCT) enables real-time, high-quality OCT imaging by eliminating the need for data resampling, as required in conventional SS-OCT. In this study, we introduced a high-performance linear-wavenumber swept source (k-SS) with a broad scanning range and high output power. The linear k-SS is an acousto-optic-modulator-based external-cavity laser diode analogous to the Littrow configuration. The k-SS exhibits strong linearity in the 1.3 µm region, justified by a high goodness of fit R2 value of 0.9998. Additionally, its scanning range, output power, and linewidth are 120 nm, more than 43 mW, and approximately 1.6 nm, respectively. The sweep rate is 280 Hz after the linear k compensation of the experimental equipment. We demonstrated the effectiveness of the linear k-SS by applying it to measure a sample distribution without k-domain resampling before the Fourier transform. This successful implementation indicates that the linear k-SS has practical potential for application in SS-OCT systems.

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External-cavity laser diode using acousto-optic deflector as tunable grating

et al. 2022

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In this study, a novel, to the best of our knowledge, external-cavity laser diode (ECLD) without a diffraction grating is proposed and demonstrated. In the proposed configuration, an acousto-optic deflector (AOD) acts not only as a deflector but also as a diffraction grating. Thus, the AOD functions as a wavelength-selective device, which helps improve the overall performance of the ECLD. In fact, the proposed configuration realizes a wide range of wavelength scanning with a simple configuration, highly efficient optical feedback, and a steady optical resonator with a constant cavity length. We confirm that the wavelengths scanned with the proposed ECLD agree well with theoretical calculations. The scanning range and maximum frequency response reached approximately 60 nm and 50 kHz, respectively. Moreover, reproducible measurements of the three-dimensional thickness distribution of a thin glass plate indicates that the proposed ECLD can be used for optical coherence tomography imaging systems.

show abstract

Acousto-optically tuned external-cavity laser diode for optical coherence tomography with continuous wavelet transform

Cited by 3 publications

References 17 publications

Beam-shaping design for multi-wavelength diode laser stack system coupled into optical fiber for biomedical applications

Beam-shaping design for multi-wavelength diode laser stack system coupled into optical fiber for biomedical applications

Linear-wavenumber swept source based on an acousto-optic device for optical coherence tomography

External-cavity laser diode using acousto-optic deflector as tunable grating

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