INTERFEROMETRIC FREQUENCY-RATIO DETERMINATION OF STABILIZED 473-THZ AND 88-THZ LASER RADIATIONS

By means of a 1-meter Fabry-Perot etalon, a measurement has been made of the frequency ratio of a He-Ne laser, stabilized to component 'i' of the 11-5, R(127) transition in **1**2**7I//2 at 473 THz, relative to a laser stabilized to transition nu //3, P(7), component F//2**(**2**) of methane at 88 THz. This result, f//i/f//C//H//4 equals 5. 359 048 172 57 which as a fractional standard deviation of 2 multiplied by 10** minus **1**0, is used with the result of a previous frequency measurement of the 88 THz laser in order to calculate the frequency of the 473 THz reference laser. 17 refs.