scholarly journals Thermoactivated cavitation induced in water by low power, continuous wave thulium-doped fiber laser

2019 ◽  
Vol 65 (2) ◽  
pp. 185
Author(s):  
N. Korneev ◽  
P. Rodríguez-Montero ◽  
M. Durán Sánchez ◽  
B. Ibarra Escamilla ◽  
And E. Kuzin
Keyword(s):  
Low Power ◽  
Fiber Laser ◽  
Absorption Line ◽  
Cavitation Bubble ◽  
Biomedical Applications ◽  
Continuous Wave ◽  
Pure Water ◽  
Bubble Formation ◽  
Ultrasound Wave

We demonstrate that by focusing in pure water the light of a CW thulium doped fiber laser tuned at a wavelength close to the 1950 nm absorption line of the water and with power of few hundreds of milliwatts, a thermoactivated cavitation bubble formation is obtained. On collapse, a strong ultrasound wave is observed. This effect can be potentially useful for biomedical applications.

scholarly journals Power controllable gain switched fiber laser at ~ 3 μm and ~ 2.1 μm

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yiwen Shi ◽  
Jianfeng Li ◽  
Chendong Lai ◽  
Hanlin Peng ◽  
Chen Zhu ◽  
...  
Keyword(s):  
Pump Power ◽  
Low Power ◽  
Fiber Laser ◽  
Output Power ◽  
Laser Power ◽  
Continuous Wave ◽  
Pulsed Laser ◽  
Maximum Output ◽  
Pump Source

AbstractBased on a hybrid pumping method consisting of a 1150 nm continuous-wave pump source and a 1950 nm pulsed pump source, we demonstrate a power controllable gain-switched fiber laser in dual wavebands at ~ 3 μm and ~ 2.1 μm. Different pumping schemes for pumping a Ho3+-doped ZBLAN fiber are studied. Using only the 1950 nm pulsed pump source, ~ 2.1 μm gain-switched pulses with single and double pulses are obtained separately at different pump powers. This phenomenon indicates that the 1950 nm pulsed pump source acts as a modulator to trigger different states of the ~ 2.1 μm pulses. Moreover, by fixing the 1150 nm pump power at 3.259 W and adjusting the 1950 nm pump power, the output power of the ~ 2.1 μm gain-switched pulsed laser is flexibly controlled while the ~ 3 μm laser power is almost unchanged, inducing the maximum output powers of 167.96 mW and 260.27 mW at 2910.16 nm and 2061.65 nm, respectively. These results suggest that the comparatively low power of the ~ 2.1 μm gain-switched pulsed laser in dual-waveband laser can be efficiently overcome by reasonably controlling the 1950 nm pump power.

scholarly journals Thermo-responsive polymer encapsulated gold nanorods for single continuous wave laser-induced photodynamic/photothermal tumour therapy

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Beilei Gong ◽  
Yuanbing Shen ◽  
Huiyan Li ◽  
Xiaojun Li ◽  
Xia Huan ◽  
...  
Keyword(s):  
Gold Nanorods ◽  
Biomedical Applications ◽  
Continuous Wave ◽  
Continuous Wave Laser ◽  
Tumour Site ◽  
Polymer Shell ◽  
Potential System ◽  
Responsive Polymer ◽  
Good Biocompatibility ◽  
Spr Effect

AbstractOwing to strong and tunable surface plasmon resonance (SPR) effect and good biocompatibility, gold nanoparticles have been suggested to be a versatile platform for a broad range of biomedical applications. In this study, a new nanoplatform of thermo-responsive polymer encapsulated gold nanorods incorporating indocyanine green (ICG) was designed to couple the photothermal properties of gold nanorods (AuNRs) and the photodynamic properties of ICG to enhance the photodynamic/photothermal combination therapy (PDT/PTT). In addition to the significantly increased payload and enhancing photostability of ICG, the polymer shell in the nanoplatform also has thermo-responsive characteristics that can control the release of drugs at tumour sites upon the laser irradiation. On the basis of these improvements, the nanoplatform strongly increased drug aggregation at the tumour site and improved the photothermal/photodynamic therapeutic efficacy. These results suggest that this nanoplatform would be a great potential system for tumour imaging and antitumour therapy.

Switchable generation of multi-wavelength continuous wave and square-wave pluses in a bidirectional Erbium-doped fiber laser

2021 ◽  
Vol 143 ◽  
pp. 107302
Author(s):  
Wenxiang Cui ◽  
Xuefang Zhou ◽  
Meihua Bi ◽  
Guowei Yang ◽  
Miao Hu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Continuous Wave ◽  
Square Wave ◽  
Erbium Doped ◽  
Multi Wavelength

25 W continuous-wave Yb:LiLuF4 single-crystal-fiber laser oscillator

2021 ◽  
pp. 127337
Author(s):  
Sara Pizzurro ◽  
Federico Pirzio ◽  
Shu Jun ◽  
Alberto Di Lieto ◽  
Giuliano Piccinno ◽  
...  
Keyword(s):  
Single Crystal ◽  
Fiber Laser ◽  
Continuous Wave ◽  
Laser Oscillator ◽  
Crystal Fiber
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