= D. T. M. Davis, Jr.
{c}
<D. T. M. Davis, Jr.> coauthored the 1963 paper <Rotation Rate Sensing with Traveling-wave Ring Lasers by W. M. Macek and D. T. M. Davis, Jr.> with <W. M. Macek>. Its byline places both at Sperry Gyroscope Company. They reported rotation sensing with a continuously operating <helium-neon laser> in a square <optical cavity>, with counterpropagating beams combined at a detector.<Rotation Rate Sensing with Traveling-wave Ring Lasers by W. M. Macek and D. T. M. Davis, Jr.>[Printed p. 67, reproduced original byline, opening paragraph and Figure 1]{ref}
The measurement reads <beating> between optical fields. For two fields of <frequencies> $f_1,f_2$, a simple equal-amplitude model gives a detector term proportional to
$$
1+\cos\bigl(2\pi(f_1-f_2)t+\phi\bigr).
$$
The detector can therefore register the difference frequency without resolving either optical oscillation separately. In a <ring laser gyroscope>, the <Sagnac effect> makes that difference depend on <angular velocity>. This mathematical readout model explains why combining the two outputs matters; a pair of beam-power readings alone does not supply their frequency difference. The initial-only name above retains the verified publication identity.
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