Influence of diamond turning and surface cleaning processes on the degradation of KDP crystal surfaces
Conference
·
· Proceedings of SPIE - The International Society for Optical Engineering
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Cleveland Crystals, OH (United States)
One factor influencing the efficiency of KDP (potassium dihydrogen phosphate) frequency conversion arrays on the Nova laser system at LLNL has been environmental degradation, or 'fogging', of the crystal surfaces. Decreases in array transmission by as much as 20% have been attributed to crystal fogging. The surfaces of the 27-cm square Nova array crystals are prepared by a wet diamond-turning process. The rate of surface fogging has been associated with several parameters of the diamond turning and subsequent cleaning processes. High humidity during diamond turning, storage, and use on the laser tends to accelerate the fogging. We suspect that some of the additives present in the diamond turning oil increase the fogging rate and have found a machining oil which minimizes this surface degradation. Efficient removal of the machining oils from the crystal surface also minimizes the fogging problem. Care must be taken to use cleaning solvents which do not cause additional surface degradation. The fogging rate is sensitive to the crystallographic orientation of the material as well as to surface roughness related to the diamond turning process. Accelerated fogging at diamond turning artifacts may increase crystal surface roughness causing increased beam modulation and scattering losses.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5487203
- Report Number(s):
- UCRL-JC--105835; CONF-9107115--7; ON: DE91015300
- Conference Information:
- Journal Name: Proceedings of SPIE - The International Society for Optical Engineering Journal Volume: 1561
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fine diamond turning of KDP crystals
Processes for the elimination of fogging on KDP crystals prior to and during use in laser systems
Processes for the elimination of fogging on KDP crystals prior to and during use in laser systems
Journal Article
·
Sun Jun 01 00:00:00 EDT 1986
· Appl. Opt.; (United States)
·
OSTI ID:5586680
Processes for the elimination of fogging on KDP crystals prior to and during use in laser systems
Conference
·
Mon Jan 06 23:00:00 EST 1992
·
OSTI ID:5689403
Processes for the elimination of fogging on KDP crystals prior to and during use in laser systems
Conference
·
Tue Oct 22 20:00:00 EDT 1991
· Proceedings Laser-Induced Damage in Optical Materials: 1991
·
OSTI ID:10123011
Related Subjects
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360604* -- Materials-- Corrosion
Erosion
& Degradation
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208 -- Fusion Power Plant Technology-- Inertial Confinement Technology
ALKALI METAL COMPOUNDS
CLEANING
CRYSTALS
HUMIDITY
HYDROGEN COMPOUNDS
ICF DEVICES
MACHINING
NOVA FACILITY
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM PHOSPHATES
SURFACE PROPERTIES
SURFACE TREATMENTS
THERMONUCLEAR DEVICES
360601 -- Other Materials-- Preparation & Manufacture
360604* -- Materials-- Corrosion
Erosion
& Degradation
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700208 -- Fusion Power Plant Technology-- Inertial Confinement Technology
ALKALI METAL COMPOUNDS
CLEANING
CRYSTALS
HUMIDITY
HYDROGEN COMPOUNDS
ICF DEVICES
MACHINING
NOVA FACILITY
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM PHOSPHATES
SURFACE PROPERTIES
SURFACE TREATMENTS
THERMONUCLEAR DEVICES