Beam Profile Improvement of a High-Power Diode Laser Stack for Optoacoustic Applications

Sanchez, M. Isabel; Rodríguez, Sergio; Leggio, Luca; Gawali, Sandeep Babu; Gallego, Daniel; Lamela, Horacio

doi:10.1007/s10765-017-2182-1

Cited by 3 publications

(3 citation statements)

References 184 publications

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“…The main problem of this solution is the very poor beam quality of diode laser bars and stacks, which leads to the use of complex optics to correct the beam, although recently there were advances to solve this problem [30], [31]. Another simpler but less scalable solution is to combine multiple chips with a fiber package and individual current drivers [32].…”

Section: Discussionmentioning

confidence: 99%

Overdrive Short Pulse High Peak Power Diode Lasers Without Catastrophic Optical Damage

2021

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Light Imaging Detection and Ranging (LIDAR) and Optoacoustic biomedical imaging techniques are applications that have a specific laser source requirements: short pulses, high peak power per pulse and high repetition rates. A custom current driver has been designed to fulfill these requirements and characterized in order to generate high current short pulses to drive High Power Diode Lasers (HPDL) beyond their maximum rating value, with a maximum current capacity of 120 A in a range of less than 10 nanoseconds pulse width, rise times up to 2 ns and a repetition rate of 1 kHz. Four commercial HPDLs have been driven generating optical pulses of less than 10 ns and more than four times the maximum rated optical peak power. A single laser device reached a maximum peak power of 880.6 W at 6 ns pulse width, demonstrating stable operation without catastrophic optical damage and improving the typical operation characteristics of the HPDLs for high speed short pulse applications.

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Section: Discussionmentioning

confidence: 99%

Overdrive Short Pulse High Peak Power Diode Lasers Without Catastrophic Optical Damage

2021

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“…PAI systems with low-cost pulsed sources have been designed in ORPAM, ARPAM, and PAT configurations with various wavelengths, resolutions, and imaging depths and have shown potentials for clinical and pre-clinical applications. For microscopic applications, in order to facilitate in vivo clinical applications, reflection mode PAM systems with high resolution and real time image acquisition are yet to be developed, an achievement that requires further investigations into improved light delivery methods, beam shaping [ 75 ], and scanning techniques. Tomography systems would also benefit from improved SNR, depth of penetration, and imaging speed as well as further clinical evaluations more thoroughly investigating the potentials of low-cost PAT systems for disease diagnosis and monitoring.…”

Section: Discussionmentioning

confidence: 99%

Photoacoustic imaging with low-cost sources; A review

Erfanzadeh

Zhu

2019

Photoacoustics

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Benefitting from advantages of optical and ultrasound imaging, photoacoustic imaging (PAI) has demonstrated potentials in a wide range of medical applications. In order to facilitate clinical applications of PAI and encourage its application in low-resource settings, research on low-cost photoacoustic imaging with inexpensive optical sources has gained attention. Here, we review the advances made in photoacoustic imaging with low-cost sources.

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“…In order to reach the diffraction limit, the laser light should have a Gaussian profile and it should have a very small divergence angle. Using fast/slow axis microlens collimators can improve the beam profile, collimation, and consequently the focusing [62] . Also, using beam expanders with larger expansion ratios can further decrease the divergence angle and improve the collimation and focusing.…”

Section: Discussionmentioning

confidence: 99%

Laser scanning laser diode photoacoustic microscopy system

2018

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The development of low-cost and fast photoacoustic microscopy systems enhances the clinical applicability of photoacoustic imaging systems. To this end, we present a laser scanning laser diode-based photoacoustic microscopy system. In this system, a 905 nm, 325 W maximum output peak power pulsed laser diode with 50 ns pulsewidth is utilized as the light source. A combination of aspheric and cylindrical lenses is used for collimation of the laser diode beam. Two galvanometer scanning mirrors steer the beam across a focusing aspheric lens. The lateral resolution of the system was measured to be ∼21 μm using edge spread function estimation. No averaging was performed during data acquisition. The imaging speed is ∼370 A-lines per second. Photoacoustic microscopy images of human hairs, ex vivo mouse ear, and ex vivo porcine ovary are presented to demonstrate the feasibility and potentials of the proposed system.

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Beam Profile Improvement of a High-Power Diode Laser Stack for Optoacoustic Applications

Cited by 3 publications

References 184 publications

Overdrive Short Pulse High Peak Power Diode Lasers Without Catastrophic Optical Damage

Overdrive Short Pulse High Peak Power Diode Lasers Without Catastrophic Optical Damage

Photoacoustic imaging with low-cost sources; A review

Laser scanning laser diode photoacoustic microscopy system

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