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Th e r elat iv e stress-optical coefficients of 27 optical glasses Il1 ttde at the )[ ational Bureau of Standards have bee n determin ed . Th e glasses were lottded in co mp ression , an d t he a mount o f birefri ngence ,,"as m eas ured wi th a p ola rimeter , Llsing a qu a rte r-\" ave pl a te com pensator. T he stress-op t ical coeffi cients determi ned fo r t he croll'n glasses ra nged bet ween + 2.95 and + 1.82 brewsters . F or t he fli nt g lasses, a regu la r vari at ion of t he st ress-opt icttl coeffic ie nt wi t h lI'eigh t perccnt of lead oxide " 'as found with " a lues mnging fro m + 3. 18 to 1.16 brclVstcrs.

Relative stress-optical coefficients of some National Bureau of Standards optical glasses