Thermal stress in the edge cladding of Nova glass laser disks

Details Thermal stress in the edge cladding of Nova glass laser disks Thermal stress in the edge cladding of Nova glass laser disks

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987fuen.sympr....p&link_type=abstract

Presented at the Symposium on Fusion Engineering, Monterey, Calif., 12 Oct. 1987

Physics

Absorptivity, Cladding, Glass Lasers, Laser Fusion, Nova Laser System, Thermal Stresses, Adhesives, Edges, Laser Materials, Temperature Distribution, Tensile Stress

Scientific paper

We calculated thermal stresses in Nova glass laser disks having light-absorbing edge cladding glass attached to the periphery with an epoxy adhesive. Our closed-form solutions indicated that, because the epoxy adhesive is only 25 microns across, it does not significantly affect the thermal stress in the disk or cladding glass. Our numerical results showed a peak tensile stress in the cladding glass of 24 MPa when the cladding glass had a uniform absorption coefficient of 7.5/cm. This peak value is reduced to 19 MPa if surface parasitic oscillation heating is eliminated by tilting the disk edges. The peak tensile stresses exceed the typical 7 to 14-MPa working stress for glass; however, we have not observed any disk or cladding glass failures at peak Nova fluences of 20 J/sq cm . We have observed delamination of the epoxy adhesive bond at fluences several times that which would occur on Nova. Replacement laser disks will incorporate cladding with a reduced absorption coefficient of 4.5/cm. Recent experiments show that this reduced absorption coefficient is satisfactory.

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