Demonstration of a high-power pulsed-fiber-laser-pumped DUV laser and its use for deactivation of E-Coli bacteria

Qiang Fu; Niall Hanrahan; Lin Xu; Di Lin; Yongmin Jung; Sumeet Mahajan; David Richardson

doi:10.1117/12.2608654

1 April 2022 Demonstration of a high-power pulsed-fiber-laser-pumped DUV laser and its use for deactivation of E-Coli bacteria

Qiang Fu, Niall Hanrahan, Lin Xu, Di Lin, Yongmin Jung, Sumeet Mahajan, David Richardson

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Proceedings Volume PC11985, Nonlinear Frequency Generation and Conversion: Materials and Devices XXI; PC119850T (2022) https://doi.org/10.1117/12.2608654
Event: SPIE LASE, 2022, San Francisco, California, United States

Abstract

We report the development of a high-power, fiber-laser-pumped, sub-nanosecond pulsed 260 nm DUV laser and demonstrate its use for bacterial disinfection. The source generates up to 5.8 W of average power at 260 nm (585 ps pulses at a repetition rate of 1.6 MHz, corresponding to a pulse energy of 3.6 μJ and a peak power of 6.9 kW). The results represent the highest DUV output power from an all-fiberized fiber laser pumped frequency conversion source to date. We demonstrate the application of the laser system to bacterial inactivation. A survival rate of less than 1 in 100000 is demonstrated for E. Coli bacteria after exposure to a DUV dose of 7 mJ/cm2.

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Qiang Fu, Niall Hanrahan, Lin Xu, Di Lin, Yongmin Jung, Sumeet Mahajan, and David Richardson "Demonstration of a high-power pulsed-fiber-laser-pumped DUV laser and its use for deactivation of E-Coli bacteria", Proc. SPIE PC11985, Nonlinear Frequency Generation and Conversion: Materials and Devices XXI, PC119850T (1 April 2022); https://doi.org/10.1117/12.2608654

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KEYWORDS

Deep ultraviolet

Bacteria

Fiber lasers

High power lasers

Crystals

Laser applications

Laser systems engineering

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