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Lekosiotis A, Belli F, Brahms C, Sabbah M, Sakr H, Davidson IA, Poletti F, Travers JC. On-target delivery of intense ultrafast laser pulses through hollow-core anti-resonant fibers. OPTICS EXPRESS 2023; 31:30227-30238. [PMID: 37710569 DOI: 10.1364/oe.496506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 08/08/2023] [Indexed: 09/16/2023]
Abstract
We report the flexible on-target delivery of 800 nm wavelength, 5 GW peak power, 40 fs duration laser pulses through an evacuated and tightly coiled 10 m long hollow-core nested anti-resonant fiber by positively chirping the input pulses to compensate for the anomalous dispersion of the fiber. Near-transform-limited output pulses with high beam quality and a guided peak intensity of 3 PW/cm2 were achieved by suppressing plasma effects in the residual gas by pre-pumping the fiber with laser pulses after evacuation. This appears to cause a long-term removal of molecules from the fiber core. Identifying the fluence at the fiber core-wall interface as the damage origin, we scaled the coupled energy to 2.1 mJ using a short piece of larger-core fiber to obtain 20 GW at the fiber output. This scheme can pave the way towards the integration of anti-resonant fibers in mJ-level nonlinear optical experiments and laser-source development.
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Ferchaud C, Jarosch S, Avni T, Alexander O, Barnard JCT, Larsen EW, Matthews MR, Marangos JP. Interaction of an intense few-cycle infrared laser pulse with an ultrathin transparent liquid sheet. OPTICS EXPRESS 2022; 30:34684-34692. [PMID: 36242475 DOI: 10.1364/oe.457470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 06/25/2022] [Indexed: 06/16/2023]
Abstract
We experimentally study the interaction between intense infrared few-cycle laser pulses and an ultrathin (∼2 µm) flat liquid sheet of isopropanol running in vacuum. We observe a rapid decline in transmission above a critical peak intensity of 50 TW/cm2 of the initially transparent liquid sheet, and the emission of a plume of material. We find both events are due to the creation of a surface plasma and are similar to processes observed in dielectric solids. After calculating the electron density for different laser peak intensities, we find an electron scattering rate of 0.3 fs-1 in liquid isopropanol to be consistent with our data. We study the dynamics of the plasma plume to find the expansion velocity of the plume front.
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Block E, Greco M, Vitek D, Masihzadeh O, Ammar DA, Kahook MY, Mandava N, Durfee C, Squier J. Simultaneous spatial and temporal focusing for tissue ablation. BIOMEDICAL OPTICS EXPRESS 2013; 4:831-41. [PMID: 23761847 PMCID: PMC3675863 DOI: 10.1364/boe.4.000831] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 04/11/2013] [Accepted: 05/06/2013] [Indexed: 05/21/2023]
Abstract
Simultaneous spatial temporal focusing (SSTF) is used to deliver microjoule femtosecond pulses with low numerical aperture geometries (<0.05 NA) with characteristics that are significantly improved compared to standard focusing paradigms. Nonlinear effects that would normally result in focal plane shifts and focal spot distortion are mitigated when SSTF is employed. As a result, it is shown that SSTF will enable surgical implementations that are presently inhibited.
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Affiliation(s)
- Erica Block
- Department of Physics, Colorado School of Mines, 1523 Illinois Street, Golden, CO 80401, USA
| | - Michael Greco
- Department of Physics, Colorado School of Mines, 1523 Illinois Street, Golden, CO 80401, USA
| | - Dawn Vitek
- Department of Physics, Colorado School of Mines, 1523 Illinois Street, Golden, CO 80401, USA
| | - Omid Masihzadeh
- Department of Ophthalmology, University of Colorado School of Medicine, Aurora CO, 80045, USA
| | - David A. Ammar
- Department of Ophthalmology, University of Colorado School of Medicine, Aurora CO, 80045, USA
| | - Malik Y. Kahook
- Department of Ophthalmology, University of Colorado School of Medicine, Aurora CO, 80045, USA
| | - Naresh Mandava
- Department of Ophthalmology, University of Colorado School of Medicine, Aurora CO, 80045, USA
| | - Charles Durfee
- Department of Physics, Colorado School of Mines, 1523 Illinois Street, Golden, CO 80401, USA
| | - Jeff Squier
- Department of Physics, Colorado School of Mines, 1523 Illinois Street, Golden, CO 80401, USA
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