Joseph Menapace - Academia.edu (original) (raw)
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Corrective optical elements form an important part of high‐precision optical systems. We have dev... more Corrective optical elements form an important part of high‐precision optical systems. We have developed a method to manufacture high‐gradient corrective optical elements for high‐power laser systems using deterministic MRF imprinting technology. Several process factors need to be considered for polishing ultra‐precise topographical structures onto optical surfaces using MRF. They include proper selection of MRF removal function and wheel sizes, detailed MRF tool and interferometry alignment, and optimized MRF polishing schedules. Dependable interferometry is also a key factor to high‐gradient component manufacture. A wavefront attenuating cell is discussed that enables reliable measurement of gradients beyond that attainable using conventional interferometry. The results of MRF imprinting a 23‐m deep structure containing gradients over 1.6 m/mm onto a fused silica window are presented as an example of the technique's capabilities. This high‐gradient element serves as a thermal correction plate in the High‐Repetition‐Rate Advanced Petawatt Laser System (HAPLS) currently being built at Lawrence Livermore National Laboratory. OCIS codes: (140.0140) Lasers and laser optics; (140.3300) Laser beam shaping; (220.0220) Optical design and fabrication; (220.1000)
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Laser-Induced Damage in Optical Materials: 2010, 2010
ABSTRACT Over the last eight years we have been developing advanced MRF tools and techniques to m... more ABSTRACT Over the last eight years we have been developing advanced MRF tools and techniques to manufacture meter-scale optics for use in Megajoule class laser systems. These systems call for optics having unique characteristics that can complicate their fabrication using conventional polishing methods. First, exposure to the high-power nanosecond and sub-nanosecond pulsed laser environment in the infrared (>27 J/cm2 at 1053 nm), visible (>18 J/cm2 at 527 nm), and ultraviolet (>10 J/cm2 at 351 nm) demands ultra-precise control of optical figure and finish to avoid intensity modulation and scatter that can result in damage to the optics chain or system hardware. Second, the optics must be super-polished and virtually free of surface and subsurface flaws that can limit optic lifetime through laser-induced damage initiation and growth at the flaw sites, particularly at 351 nm. Lastly, ultra-precise optics for beam conditioning are required to control laser beam quality. These optics contain customized surface topographical structures that cannot be made using traditional fabrication processes. In this review, we will present the development and implementation of large-aperture MRF tools and techniques specifically designed to meet the demanding optical performance challenges required in large aperture high-power laser systems. In particular, we will discuss the advances made by using MRF technology to expose and remove surface and subsurface flaws in optics during final polishing to yield optics with improve laser damage resistance, the novel application of MRF deterministic polishing to imprint complex topographical information and wavefront correction patterns onto optical surfaces, and our efforts to advance the technology to manufacture largeaperture damage resistant optics.
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Unknown, Dec 1, 1991
EPRFIT is a computerized analysis and modeling package which simulates isotropic EPR spectra. The... more EPRFIT is a computerized analysis and modeling package which simulates isotropic EPR spectra. The package performs first and second order spectral simulations of both single configuration species and exchange-broadened species containing up to 7 exchanging configurations. The program simulates spectra composed of up to 2200 individual lines and up to 14 distinct spin species with nuclear spins within the range 0-9.5. The various procedures within the program are accessed via a user friendly menu-based package. Data entry is conducted using a spreadsheet architecture which provides the user with easy access to data for inspection and editing. Simulation data, simulated spectra, and experimental/simulated spectrum comparison files can be retrieved and stored onto hard/floppy disk storage in either ASCII or packed formats. ASCII output provides a useful means for linking the data/spectra to other analysis packages as well as for use in printing/plotting routines. The simulated and comparison spectra can also be displayed and analyzed graphically within the program. Spectral analysis options include spectrum offsetting, panning, zooming, and peak position and intensity identification routines. These operations apply to both simulated and comparison spectra. Hardcopies of the simulation results and any combination of spectra can be printed onto Epson compatible dot matrix printers for future reference or presentation.
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ABSTRACT
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Laser-Induced Damage in Optical Materials: 2003, 2004
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Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, 2004
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Laser-Induced Damage in Optical Materials: 2005, 2005
ABSTRACT Antireflection (AR) coatings typically damage at the interface between the substrate and... more ABSTRACT Antireflection (AR) coatings typically damage at the interface between the substrate and coating. Therefore the substrate finishing technology can have an impact on the laser resistance of the coating. For this study, AR coatings were deposited on Yb:S-FAP [Yb3+:Sr5(PO4)3F] crystals that received a final polish by both conventional pitch lap finishing as well as magnetorheological finishing (MRF). SEM images of the damage morphology reveals laser damage originates at scratches and at substrate coating interfacial absorbing defects. Previous damage stability tests on multilayer mirror coatings and bare surfaces revealed damage growth can occur at fluences below the initiation fluence. The results from this study suggest the opposite trend for AR coatings. Investigation of unstable HR and uncoated surface damage morphologies reveals significant radial cracking that is not apparent with AR damage due to AR delamination from the coated surface with few apparent cracks at the damage boundary. Damage stability tests show that coated Yb:S-FAP crystals can operate at 1057 nm at fluences around 20 J/cm2 at 10 ns; almost twice the initiation damage threshold.
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Laser Beam Shaping IX, 2008
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Laser-Induced Damage in Optical Materials: 2001, 2002
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Laser-Induced Damage in Optical Materials: 2006, 2006
The Mercury laser uses ytterbium-doped strontium fluorapatite (Yb:S-FAP) crystals as the gain med... more The Mercury laser uses ytterbium-doped strontium fluorapatite (Yb:S-FAP) crystals as the gain medium with a nominal clear aperture of 4 x 6 cm. Recent damage test data have indicated the existence of bulk precursors in Yb:S-FAP that initiate damage starting at approximately 10 J/cm2 at 9 ns under 1064 nm irradiation. In this paper, we report on preliminary results on
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Solid State Lasers XIII: Technology and Devices, 2004
We report initial operation of the Mercury laser with seven 4 x 6 cm S-FAP amplifier slabs pumped... more We report initial operation of the Mercury laser with seven 4 x 6 cm S-FAP amplifier slabs pumped by four 80 kW diode arrays. The system produced up to 33.5 J single shot, 23.5 J at 5 Hz, and 10 J at 10 Hz for 20 minute runs at 1047 nm. During the initial campaign, more than 2.8 x 104
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The Journal of Physical Chemistry, 1987
ABSTRACT
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The Journal of Physical Chemistry, 1991
... Chem. 1985.89,4809. (f) Shackelford. S. A.; Goshgarian, BB; Chapman, RD; Askins, RE; Flanigan... more ... Chem. 1985.89,4809. (f) Shackelford. S. A.; Goshgarian, BB; Chapman, RD; Askins, RE; Flanigan, DA; Rogers, RN Propellants, Explos. Pyrotech. 1989,14,93. ... Shackelford, SA J. Phys. (Paris) 1987, 48, C4-193. (7) (a) Menapace, JA; Marlin, JE J . Phys. Chem. 1990,94,1906. ...
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Corrective optical elements form an important part of high‐precision optical systems. We have dev... more Corrective optical elements form an important part of high‐precision optical systems. We have developed a method to manufacture high‐gradient corrective optical elements for high‐power laser systems using deterministic MRF imprinting technology. Several process factors need to be considered for polishing ultra‐precise topographical structures onto optical surfaces using MRF. They include proper selection of MRF removal function and wheel sizes, detailed MRF tool and interferometry alignment, and optimized MRF polishing schedules. Dependable interferometry is also a key factor to high‐gradient component manufacture. A wavefront attenuating cell is discussed that enables reliable measurement of gradients beyond that attainable using conventional interferometry. The results of MRF imprinting a 23‐m deep structure containing gradients over 1.6 m/mm onto a fused silica window are presented as an example of the technique's capabilities. This high‐gradient element serves as a thermal correction plate in the High‐Repetition‐Rate Advanced Petawatt Laser System (HAPLS) currently being built at Lawrence Livermore National Laboratory. OCIS codes: (140.0140) Lasers and laser optics; (140.3300) Laser beam shaping; (220.0220) Optical design and fabrication; (220.1000)
Bookmarks Related papers MentionsView impact
Laser-Induced Damage in Optical Materials: 2010, 2010
ABSTRACT Over the last eight years we have been developing advanced MRF tools and techniques to m... more ABSTRACT Over the last eight years we have been developing advanced MRF tools and techniques to manufacture meter-scale optics for use in Megajoule class laser systems. These systems call for optics having unique characteristics that can complicate their fabrication using conventional polishing methods. First, exposure to the high-power nanosecond and sub-nanosecond pulsed laser environment in the infrared (>27 J/cm2 at 1053 nm), visible (>18 J/cm2 at 527 nm), and ultraviolet (>10 J/cm2 at 351 nm) demands ultra-precise control of optical figure and finish to avoid intensity modulation and scatter that can result in damage to the optics chain or system hardware. Second, the optics must be super-polished and virtually free of surface and subsurface flaws that can limit optic lifetime through laser-induced damage initiation and growth at the flaw sites, particularly at 351 nm. Lastly, ultra-precise optics for beam conditioning are required to control laser beam quality. These optics contain customized surface topographical structures that cannot be made using traditional fabrication processes. In this review, we will present the development and implementation of large-aperture MRF tools and techniques specifically designed to meet the demanding optical performance challenges required in large aperture high-power laser systems. In particular, we will discuss the advances made by using MRF technology to expose and remove surface and subsurface flaws in optics during final polishing to yield optics with improve laser damage resistance, the novel application of MRF deterministic polishing to imprint complex topographical information and wavefront correction patterns onto optical surfaces, and our efforts to advance the technology to manufacture largeaperture damage resistant optics.
Bookmarks Related papers MentionsView impact
Unknown, Dec 1, 1991
EPRFIT is a computerized analysis and modeling package which simulates isotropic EPR spectra. The... more EPRFIT is a computerized analysis and modeling package which simulates isotropic EPR spectra. The package performs first and second order spectral simulations of both single configuration species and exchange-broadened species containing up to 7 exchanging configurations. The program simulates spectra composed of up to 2200 individual lines and up to 14 distinct spin species with nuclear spins within the range 0-9.5. The various procedures within the program are accessed via a user friendly menu-based package. Data entry is conducted using a spreadsheet architecture which provides the user with easy access to data for inspection and editing. Simulation data, simulated spectra, and experimental/simulated spectrum comparison files can be retrieved and stored onto hard/floppy disk storage in either ASCII or packed formats. ASCII output provides a useful means for linking the data/spectra to other analysis packages as well as for use in printing/plotting routines. The simulated and comparison spectra can also be displayed and analyzed graphically within the program. Spectral analysis options include spectrum offsetting, panning, zooming, and peak position and intensity identification routines. These operations apply to both simulated and comparison spectra. Hardcopies of the simulation results and any combination of spectra can be printed onto Epson compatible dot matrix printers for future reference or presentation.
Bookmarks Related papers MentionsView impact
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ABSTRACT
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Laser-Induced Damage in Optical Materials: 2003, 2004
Bookmarks Related papers MentionsView impact
Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, 2004
Bookmarks Related papers MentionsView impact
Laser-Induced Damage in Optical Materials: 2005, 2005
ABSTRACT Antireflection (AR) coatings typically damage at the interface between the substrate and... more ABSTRACT Antireflection (AR) coatings typically damage at the interface between the substrate and coating. Therefore the substrate finishing technology can have an impact on the laser resistance of the coating. For this study, AR coatings were deposited on Yb:S-FAP [Yb3+:Sr5(PO4)3F] crystals that received a final polish by both conventional pitch lap finishing as well as magnetorheological finishing (MRF). SEM images of the damage morphology reveals laser damage originates at scratches and at substrate coating interfacial absorbing defects. Previous damage stability tests on multilayer mirror coatings and bare surfaces revealed damage growth can occur at fluences below the initiation fluence. The results from this study suggest the opposite trend for AR coatings. Investigation of unstable HR and uncoated surface damage morphologies reveals significant radial cracking that is not apparent with AR damage due to AR delamination from the coated surface with few apparent cracks at the damage boundary. Damage stability tests show that coated Yb:S-FAP crystals can operate at 1057 nm at fluences around 20 J/cm2 at 10 ns; almost twice the initiation damage threshold.
Bookmarks Related papers MentionsView impact
Laser Beam Shaping IX, 2008
Bookmarks Related papers MentionsView impact
Laser-Induced Damage in Optical Materials: 2001, 2002
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Laser-Induced Damage in Optical Materials: 2006, 2006
The Mercury laser uses ytterbium-doped strontium fluorapatite (Yb:S-FAP) crystals as the gain med... more The Mercury laser uses ytterbium-doped strontium fluorapatite (Yb:S-FAP) crystals as the gain medium with a nominal clear aperture of 4 x 6 cm. Recent damage test data have indicated the existence of bulk precursors in Yb:S-FAP that initiate damage starting at approximately 10 J/cm2 at 9 ns under 1064 nm irradiation. In this paper, we report on preliminary results on
Bookmarks Related papers MentionsView impact
Solid State Lasers XIII: Technology and Devices, 2004
We report initial operation of the Mercury laser with seven 4 x 6 cm S-FAP amplifier slabs pumped... more We report initial operation of the Mercury laser with seven 4 x 6 cm S-FAP amplifier slabs pumped by four 80 kW diode arrays. The system produced up to 33.5 J single shot, 23.5 J at 5 Hz, and 10 J at 10 Hz for 20 minute runs at 1047 nm. During the initial campaign, more than 2.8 x 104
Bookmarks Related papers MentionsView impact
The Journal of Physical Chemistry, 1987
ABSTRACT
Bookmarks Related papers MentionsView impact
The Journal of Physical Chemistry, 1991
... Chem. 1985.89,4809. (f) Shackelford. S. A.; Goshgarian, BB; Chapman, RD; Askins, RE; Flanigan... more ... Chem. 1985.89,4809. (f) Shackelford. S. A.; Goshgarian, BB; Chapman, RD; Askins, RE; Flanigan, DA; Rogers, RN Propellants, Explos. Pyrotech. 1989,14,93. ... Shackelford, SA J. Phys. (Paris) 1987, 48, C4-193. (7) (a) Menapace, JA; Marlin, JE J . Phys. Chem. 1990,94,1906. ...
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