TY - GEN
T1 - Comparison of acoustic shock waves generated by micro and nanosecond lasers for a smart laser surgery system
AU - Nguendon, Hervé
AU - Rauter, Georg
AU - Guzman, Raphael
AU - Cattin, Philippe
AU - Zam, Azhar
N1 - Publisher Copyright:
© 2018 SPIE.
PY - 2018
Y1 - 2018
N2 - Characterization of acoustic shock wave will guarantee efficient tissue differentiation as feedback to reduce the probability of undesirable damaging (i.e. cutting) of tissues in laser surgery applications. We ablated hard (bone) and soft (muscle) tissues using a nanosecond pulsed Nd:YAG laser at 532 nm and a microsecond pulsed Er:YAG laser at 2.94 μm. When the intense short ns-pulsed laser is applied to material, the energy gain causes locally a plasma at the ablated spot that expands and propagates as an acoustic shock wave with a rarefaction wave behind the shock front. However, when using a μs-pulsed Er:YAG laser for material ablation, the acoustic shock wave is generated during the explosion of the ablated material. We measured and compared the emitted acoustic shock wave generated by a ns-pulsed Nd:YAG laser and a μs-pulsed Er:YAG laser measured by a calibrated microphone. As the acoustic shock wave attenuates as it propagates through air, the distance between ablation spots and a calibrated microphone was at 5 cm. We present the measurements on the propagation characteristics of the laser generated acoustic shock wave by measuring the arrival time-of-flight with a calibrated microphone and the energy-dependent evolution of acoustic parameters such as peak-topeak pressure, the ratio of the peak-to-peak pressures for the laser induced breakdown in air, the ablated muscle and the bone, and the spectral energy.
AB - Characterization of acoustic shock wave will guarantee efficient tissue differentiation as feedback to reduce the probability of undesirable damaging (i.e. cutting) of tissues in laser surgery applications. We ablated hard (bone) and soft (muscle) tissues using a nanosecond pulsed Nd:YAG laser at 532 nm and a microsecond pulsed Er:YAG laser at 2.94 μm. When the intense short ns-pulsed laser is applied to material, the energy gain causes locally a plasma at the ablated spot that expands and propagates as an acoustic shock wave with a rarefaction wave behind the shock front. However, when using a μs-pulsed Er:YAG laser for material ablation, the acoustic shock wave is generated during the explosion of the ablated material. We measured and compared the emitted acoustic shock wave generated by a ns-pulsed Nd:YAG laser and a μs-pulsed Er:YAG laser measured by a calibrated microphone. As the acoustic shock wave attenuates as it propagates through air, the distance between ablation spots and a calibrated microphone was at 5 cm. We present the measurements on the propagation characteristics of the laser generated acoustic shock wave by measuring the arrival time-of-flight with a calibrated microphone and the energy-dependent evolution of acoustic parameters such as peak-topeak pressure, the ratio of the peak-to-peak pressures for the laser induced breakdown in air, the ablated muscle and the bone, and the spectral energy.
KW - acoustic shock waves
KW - laser ablation
KW - Laser induced plasma
KW - laser surgery
KW - tissue differentiation
UR - http://www.scopus.com/inward/record.url?scp=85046799614&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85046799614&partnerID=8YFLogxK
U2 - 10.1117/12.2290094
DO - 10.1117/12.2290094
M3 - Conference contribution
AN - SCOPUS:85046799614
T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
BT - Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XVI
A2 - Vo-Dinh, Tuan
A2 - Grundfest, Warren S.
A2 - Mahadevan-Jansen, Anita
PB - SPIE
T2 - Advanced Biomedical and Clinical Diagnostic and Surgical Guidance Systems XVI 2018
Y2 - 28 January 2018 through 30 January 2018
ER -