Optical damage at the part per million level: the role of trace contamination in laser-induced optical damage

Hovis, Floyd E.; Shepherd, Bart A.; Radcliffe, Christopher T.; Bailey, Andrew L.; Boswell, William T.

doi:10.1117/12.180872

Cited by 31 publications

(14 citation statements)

References 1 publication

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“…The laser system consists of two fully redundant lasers, each with its own independent set of electronics. The laser canister design, illustrated in Figure 1, is a dual compartment design that is pressurized with air to reduce the sensitivity to trace contamination induced damage [18][19] . The center plane of the dual compartment is carefully designed to minimize pressure induced distortion effects when operated in vacuum.…”

Section: Icesat-2 Laser Transmitter Design Overviewmentioning

confidence: 99%

Approach to space-qualification of the ICESat-2 laser transmitter

et al. 2013

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The design of space-flight hardware is typically required to be at a Technology Readiness Level (TRL) of 6 before the build of the actual flight hardware can begin. At the early design phase the "relevant environment" for TRL-6 is frequently not well defined. For the ICESat-2 laser relevant environment was defined as the qualification levels in GEVS (General Environmental Verification Standard, GSFC-STD-7000). Our approach to dealing with the high-frequency content of the 14.1 g rms random vibration levels in GEVS was a flexure mounted canister design that filtered the highfrequency content. In our talk we will discuss the program and system level implications of this design approach.

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Section: Icesat-2 Laser Transmitter Design Overviewmentioning

confidence: 99%

Approach to space-qualification of the ICESat-2 laser transmitter

et al. 2013

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“…One reason is the lack of oxygen which is known to prevent from carbonaceous contamination [07][11] [12] . We know that during the growth of the contamination layer, the absorption and consequently the temperature of the surface increases.…”

Section: (Mbar)mentioning

confidence: 99%

“…Works at 1,06 µm have been done to determine the effects of different materials used for the assembly of sealed Nd-YAG lasers [07][08] [09] . Contamination was also observed at 840 nm in packaged laser diodes [10] .…”

Section: Introductionmentioning

confidence: 99%

Ageing of optical components under laser irradiation at 532nm

et al. 2005

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The pulsed Laser Induced Damage Threshold (LIDT) of optical components usually reaches several hundreds of MW/cm². When exposed to laser power several order of magnitude below their LIDT, the optical component lifetime is, by default, considered infinite.Under specific conditions, the accumulation of laser pulses may lead to a contamination of the surface and a degradation of its optical properties and LIDT. In the first order, these phenomena depend on the experimental conditions such as the irradiation time, the laser power, and the environment.In order to better understand the physics emphasizing this degradation, we developed an experimental cell with an in-situ spectroscopic ellipsometry diagnostic. The dry-pumped cell sheltering the sample is associated with a mass spectrometer that enables us to follow the environmental conditions in which we experiment the ageing. Anti-reflection coatings on fused silica were tested under 10 kHz-532 nm laser ageing. We present first results of degradation obtained in these conditions.

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“…1 Optics that have been shown to last well over 1 million laser pulses, in "clean" lab environments can exhibit laser induced damage in as few as 8,000 pulses in the presence of contaminants, greatly reducing the survivability of some space-based laser systems. 2 CELID can occur in vacuum or in sealed enclosures. 3 The performance degradation is often associated with on-orbit contamination (outgassing, etc.)…”

Section: Introductionmentioning

confidence: 99%

Contamination resistant coatings for enhanced laser damage thresholds

Fowler

Villahermosa

2012

SPIE Proceedings

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This paper describes a novel approach for the suppression of contamination enhanced laser damage to optical components by the use of fluorinated coatings that repel organic contaminates. In prior work we studied laser damage thresholds induced by ppm levels of toluene under nanosecond 1.064 μm irradiation of fused silica optics. That work showed that moderate vapor-phase concentrations (< 15%) of water and alcohols dramatically increased the laser damage threshold. The data are consistent with the hypothesis that water and alcohols interact more favorably with the hydroxylated silica surface thereby displacing toluene from the surface. In this work, preliminary results show that fluorinated self assembled monolayer coatings can be used to accomplish the same effect. Optics coated with fluorinated films have much higher survival rates compared with uncoated optics under the same conditions. In addition to enhancing survival of laser optics, these coatings have implications for protecting spacecraft imaging optics from organic contamination.

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Optical damage at the part per million level: the role of trace contamination in laser-induced optical damage

Cited by 31 publications

References 1 publication

Approach to space-qualification of the ICESat-2 laser transmitter

Approach to space-qualification of the ICESat-2 laser transmitter

Ageing of optical components under laser irradiation at 532nm

Contamination resistant coatings for enhanced laser damage thresholds

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