A passive fiber-optic resonator technique for rotation sensing has been investigated. Preliminary data show a noise-equivalent rotation-rate sensitivity of 0.5 degrees /h (tau= 1 sec), which is an order of magnitude above the photonshot-noise limit. The major sources of error and ways of reducing such errors are discussed.

A piezospectroscopic study of the Lyman spectra of arsenic, antimony, phosphorus, and magnesium donors in silicon has been made using a quantitative-stress cryostat. Within experimental error, all four impurities yield the same value for the shear-deformationpotential constant'="of the (100) conduction-band minima. The average value of "" thus obtained is 8. 77+0. 07 eV. The shift of the 1s(A~) ground state under stress is characterized by a value of "which is lower than the above, viz. , 8. 3, 8. I, and 7. 0 eV for antimony, phosphorus, and arsenic, respectively.

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