Delayed-self-heterodyne measurement of laser frequency fluctuations

  title={Delayed-self-heterodyne measurement of laser frequency fluctuations},
  author={Osamu Ishida},
The two-sample (or Allan) variance of frequency fluctuations was used for laser frequency-noise characterization at Fourier frequencies below 1 MHz. The delayed self-heterodyne technique was used for the variance measurement. Analytical calculations ensure that just twice the variance values were observed at tau >