Brief Communications

Investigation of microdamage to dielectric coatings by laser radiation

M. B. Svechnikov, L. S. Vakhmyanina


Abstract: An experimental investigation was made of the behavior of microdefects in refractory oxide and sulfide-fluoride dielectric coatings in the prethreshold range of exposure to laser radiation. The results obtained demonstrated clearly that the centers of optical breakdown in ZnS and SrF₂ (or MgF₂) coatings were strongly absorbing microinhomogeneities, whereas in coatings made of ZrO₂ and SiO₂ neither the concentration of microinhomogeneities (of > 1 μ size) nor their dimensions were affected by the action of a pulse (or a series of pulses) of power density just below the threshold.

UDC: 621.373.826

PACS: 42.78.Hk, 61.80.-x, 42.60.He

Received: 30.12.1980

 English version: Soviet Journal of Quantum Electronics, 1981, 11:5, 658–659

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