Phase-shifting laser diode interferometer using pulse modulation.
A phase-shifting laser diode interferometer that uses direct pulse modulation is proposed and demonstrated. We found that a laser beam with a wide range of wavelength variation at constant optical power could be generated when a pulsed current was injected into the laser diode. We constructed a highly accurate interferometer by using a pair of interferometers. Several experiments, such as observations of temporal interference signals and spatial interferograms, measurement of a concave mirror, and duplicate measurements, confirmed the characteristics of pulse modulation and demonstrated the effectiveness of our technique.
Niigata University, Graduate School of Science and Technology, Niigata, Japan. takamasa@eng.niigata-u.ac.jp
Takamasa
T
Suzuki
Tsubasa
T
Adachi
Osami
O
Sasaki
Samuel
S
Choi