Measurements of the dependence of damage thresholds on laser wavelength, pulse duration and film thickness

Conference · Thu Mar 01 04:00:00 EST 1984

OSTI ID:5034662

Rainer, F; Vercimak, C L; Milam, D; Carniglia, C K; Tuttle Hart, T

Results of three experiments will be described. We used 351-nm and 355-nm pulses with durations of 0.6, 1, 5 and 9 ns measure thresholds for a variety of anti-reflectance and high reflectance coatings. The functional form t/sup m/, with t the pulse duration, was used to scale fluence thresholds measured at 0.6 ns to those measured at 9.0 ns. Values of the coefficient m ranged from 0.10 to 0.51. The average value was 0.30. In the second experiment, we measured thresholds at 1064 nm, 527 nm and 355 nm for single-frequency high reflectance ZrO/sub 2//SiO/sub 2/ coatings. Coatings for all three frequencies were deposited simultaneously by use of masks in the coating chamber. Thresholds varied from 2 to 4 J/cm/sup 2/ at 355 nm to 7 to 10 J/cm/sup 2/ at 1064 nm. The third experiment measured thresholds at 355 nm for antireflection coatings made with layer thicknesses varying from greater than one wavelength to less than a quarterwavelength. A significant variation of threshold with coating thickness was not observed, but the median thresholds increased slightly as coating thickness increased.

• Research Organization: Lawrence Livermore National Lab., CA (USA); Optical Coating Lab., Inc., Santa Rosa, CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5034662
• Report Number(s): UCRL-89864; CONF-8311146-2; ON: DE84008542
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360306* -- Composite Materials-- Radiation Effects-- (-1987)
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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ANTIREFLECTION COATINGS
CHALCOGENIDES
COATINGS
DIMENSIONS
ELECTROMAGNETIC RADIATION
IRRADIATION
LASER RADIATION
OPTICAL SYSTEMS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
RADIATIONS
SILICON COMPOUNDS
SILICON OXIDES
THICKNESS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES