Expanded Damage Test Facilities at LLNL

Morgan, A.; Rainer, F.; Marco, FP De; Gonzales, R.; Kozlowski,; Staggs, M.

doi:10.1520/stp26474s

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…4 This system was recently upgraded so that we could conduct these measurements not only at the two critical harmonics but, more importantly, at two pulse durations. These durations cover both a major portion of our earlier KDP damage database at 10 ns and our immediate requirements at 3 ns.…”

Section: Experimental Parametersmentioning

confidence: 99%

Laser damage to production- and research-grade KDP crystals

1993

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We present the results of laser damage measurements conducted on potassium dihydrogen phosphate (KDP) and deuterated potassium dihydrogen phosphate (KD*P) crystals that were grown recently for both production and research applications by several sources. We have measured extrinsic damage thresholds that cover wavelengths from 1064 nm to 266 nm at pulse durations in the 3-to I 0-ns regime.Many of the samples were extracted from boules grown specifically to yield large-area crystals, up to 32-cm square, for laser fusion applications. These crystals were the result of efforts, both by the Lawrence Livermore National Laboratory (LLNL) and commercial crystal-growth companies, to yield high-threshold KDP. In particular we have established that such crystals can reliably survive fluences exceeding 15 J/cm2 at 355 nm and 20 J/cm2 at 1064 nm when irradiated with 3-ns pulses. We present details of how bulk and surface damage to these crystals scale with pulse duration and wavelength as well as of morphological effects due to laser conditioning.

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Section: Experimental Parametersmentioning

confidence: 99%

Laser damage to production- and research-grade KDP crystals

1993

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“…We conduct and contract out to the commercial sector research and development efforts to produce optical components with high damage thresholds for use in both high-peak-power and high-average-power laser systems. The high-peak-power work is in support of LLNL's Inertial Confinement Fusion (ICF) program which involves (1) the existing Nova laser system, (2) smaller ICF development laboratories, and (3) the Advanced Driver program for developing a successor to Nova. Much of this work has also overlapped with research conducted for the development of high-average-power laser systems including (1) the Medium Power Solid State Laser (MPSSL), (2) the free electron laser (FEL) program, and (3) the Laser Isotope Separation (LIS) program.…”

Section: Disclaimermentioning

confidence: 99%

“…In figure 9 we show that, as with HR coatings, we can expect to -10find a significant improvement in thresholds by implementing laser-conditioning. From a limited database of conditioned polarizer tests we have observed an increase in threshold of about a factor of two to fluences > 40 J/cm 1 Figure 9. Laser conditioning of commercial PVD-fabricated polarizers improves their dam-• age thresholds by an average factor of two to fluences > 40 J/cm'-for 10-ns pulses at 1064 nm.…”

Section: Polarizersmentioning

confidence: 99%

“…During the past year we have operated six dedicated damage-test facilities at LLNL, conducted full-aperture damage tests with the Nova laser, and also supported damage testing capabilities at several commercial locations. [1] Most of our lasers are single-shot or reprated Nd:YAG lasers operating at the fundamental wavelength, 1064 nm (lro), or at one or more of its harmonics: 532 nm (2m), 355 nm (3ro), and 266 nm (4ro). We also utilize excimer lasers for UV testini at 350 nm (XeF) and 24R nm (KrF).…”

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Damage measurements on optical materials for use in high-peak-power lasers

Rainer¹

1990

Laser-Induced Damage in Optical Materials 1989

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High Threshold HR Coatings at 1064 nm

Rainer

Marco

Hunt

et al. 1991

Laser-Induced Damage in Optical Materials: 1990

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We have conducted an extensive series of laser damage measurements on highly reflective (HR) dielectric coatings which have yielded 1064-nm thresholds as high as 40 J/cm2 for 8- to 10-ns pulses at pulse-repetition frequencies (PRF) of 10 Hz. Moreover, by laser conditioning these coatings with sub-threshold pulses, the thresholds of some coatings were raised to levels exceeding 70 J/cm2. These are the highest threshold dielectric HR coatings that we have tested in this regime. The coatings were originally developed to produce HR-overcoated metal mirrors for free-electron-laser (FED applicationsat high PRF. Our tests included coatings deposited on both dielectric substrates and molybdenum (Mo) substrates. In each category we also examined coatings with a pre-coat of Mo between the substrate and the HR stack. The improved dielectric HR stacks effectively shielded the Mo from the laser irradiation so that the thresholds of virtually all Mo samples exceeded levels of the best dielectric-enhanced and dielectric-HR-coated metal mirrors we have tested to date. In addition to the low PRF measurements, we also conducted 1064-nm damage tests at 6-kHz PRF using 65-ns pulses from the Kilroy damage test facility. The coatings survived thermal loading of fluences ranging from 2 to 10 J/cm2 with respective small spot sizes on the order of 1.2 to 0.3 mm (1/e2 diameter).

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Expanded Damage Test Facilities at LLNL

Cited by 7 publications

References 6 publications

Laser damage to production- and research-grade KDP crystals

Laser damage to production- and research-grade KDP crystals

Damage measurements on optical materials for use in high-peak-power lasers

High Threshold HR Coatings at 1064 nm

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