Particle damage sources for fused silica optics and their mitigation on high energy laser systems

Bude, J.; Carr, C. W.; Miller, Philip E.; Parham, T; Whitman, P A; Monticelli, Marcus V.; Raman, Rajesh N.; Cross, David A.; Welday, Brian; Ravizza, Frank; Suratwala, Tayyab; Davis, James A.; Fischer, M. J.; Hawley, R. A.; Lee, H; Matthews, Manyalibo J.; Norton, Mary A.; Nostrand, Mike C.; VanBlarcom, D.; Sommer, S.

doi:10.1364/oe.25.011414

Cited by 81 publications

(32 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7][8][9] With desirable absorption achieved by the Ce ions, the host matrices are selected exclusively to inherit the excellent laser damage resistance of silica. [10][11][12][13] While the manufacturing techniques have been developed for decades, knowledge of such high-silica glass is still limited, especially on the microscopic structure and atomic vibrations that are related to the optical properties.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, Ce‐doped silica has recently been proposed as a candidate absorber for the inertial confinement fusion facilities to protect the transport mirrors from laser back‐reflection, which inclines to damage the surfaces and enforce frequent exchanges of optics consequently 7‐9 . With desirable absorption achieved by the Ce ions, the host matrices are selected exclusively to inherit the excellent laser damage resistance of silica 10‐13 . While the manufacturing techniques have been developed for decades, knowledge of such high‐silica glass is still limited, especially on the microscopic structure and atomic vibrations that are related to the optical properties.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure and vibrations of cerium in silica glass from molecular dynamics simulations

et al. 2020

View full text Add to dashboard Cite

Molecular dynamics simulations are performed to investigate the effect of cerium on the structural and vibrational properties of silica glass. At low-concentration levels, the cerium ions tend to generate longer bonds with bridging oxygens than nonbridging ones, the proportion of which is associated with the average bond length varied with cerium coordination. Formed in the presence of cerium, the bond angles exhibit strong dependence on the types of Ce-O bonds that bring about different angular distributions. Despite the discrepancy in the structures between Ce 3+ and Ce 4+ , similar characteristics of vibrations are observed for the two states. In comparison with the glass formers, the vibrations of cerium that contribute primarily to the low-frequency region show a less localized behavior, whereas the acoustic-like and optic-like modes separate at a much smaller frequency.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and vibrations of cerium in silica glass from molecular dynamics simulations

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The production process flows for both the GDS and WFL optics, shown in figure 4-15, begin when they are removed from NIF due to excessive damage site growth. The GDS optics are downstream (with respect to light flow) of the WFL optics and tend to damage at a much higher rate according to NIF researchers [2]. Therefore, we will assume for simplicity that the incoming optics for recycling enter the system at a rate of about 2 GDS optics for every 1 WFL optic.…”

Section: Collect Production Datamentioning

confidence: 99%

An Engineering Systems Approach to Production Planning of Optical Systems

Hui

2021

View full text Add to dashboard Cite

Production enterprises are continuously presented with investment opportunities to improve their production systems through the adoption of new technologies. When presented with these opportunities, enterprise leaders are faced with decisions that can have profound viability implications. A value-centric framework to holistically and systematically inform and support decisions is needed.This research introduces such a strategic framework based on Engineering Systems principles and methods. Within this framework, Enterprise System Architecting and Technology Roadmapping methods have been adapted for production systems to identify stakeholder value, create investment scenarios as project portfolios, assess performance using Discrete Event Simulation (DES) and technical modeling, and visualize options using tradespace plots.A case study, involving a representation of the National Ignition Facility's (NIF) Optics Recycle Loop production system, is explored to demonstrate the framework process steps as a guide for its application. Each of the process steps is applied to the optics production enterprise resulting in a recommended project portfolio spanning 20 years. The baseline DES simulation predicts a throughput of 129 optics/month. After investments into debottlenecking, this was boosted to 261 optics/month. In addition, product performance forecasting predicts that after product improvement investments, optics damage threshold -a key product performance figure of meritwill improve by 67%. By using the new strategic framework, production enterprises can make decisions based on projected present and future value.

show abstract

“…J. Bude found particle pollution on the surface limited the LIDT improvement of fused silica optics. After advanced migration process (AMP) 3.0 process, the particles were obviously restricted, and the surface was free from damage under 351 nm, 3 ns (FWHM), 9.5 J/cm 2 laser irradiation [ 5 ]. Through the modern process technique, the LIDT of fused silica had been greatly improved.…”

Section: Introductionmentioning

confidence: 99%

Study on the Absorption Characteristics and Laser Damage Properties of Fused Silica Optics under Flexible Polishing and Shallow DCE Process

et al. 2021

View full text Add to dashboard Cite

The enhancement of laser damage resistance of fused silica optics was a hotspot in scientific research. At present, a variety of modern processes have been produced to improve the laser induced damage threshold (LIDT) of fused silica optics. They included pre-treatment processes represented by flexible computer controlled optical surfacing (CCOS), magnetorheological finishing (MRF), ion beam finishing (IBF), and post-treatment processes represented by dynamic chemical etching (DCE). These have achieved remarkable results. However, there are still some problems that need to be solved urgently, such as excessive material removal, surface accuracy fluctuation in the DCE process, and the pollution in MRF process, etc. In view of above problems, an MRF, CCOS, IBF and shallow DCE combined technique was used to process fused silica optics. The surface morphology could be greatly controlled and chemical etching depth was reduced, while the LIDT increased steadily. After processing by this combined technique, the LIDT increased to 12.1 J/cm2 and the laser damage resistance properties of fused silica were significantly enhanced. In general, the MRF, IBF, CCOS and shallow DCE combined technique brought much help to the enhancement of laser damage resistance of fused silica, and could be used as a process route in the manufacturing process of fused silica.

show abstract

Particle damage sources for fused silica optics and their mitigation on high energy laser systems

Cited by 81 publications

References 37 publications

Structure and vibrations of cerium in silica glass from molecular dynamics simulations

Structure and vibrations of cerium in silica glass from molecular dynamics simulations

An Engineering Systems Approach to Production Planning of Optical Systems

Study on the Absorption Characteristics and Laser Damage Properties of Fused Silica Optics under Flexible Polishing and Shallow DCE Process

Contact Info

Product

Resources

About