We demonstrate a laser system consisting of a >1.6 Wtitanium:sapphire laser that is phase locked to another free-running titanium:sapphire laser at a wavelength of 852 nm with a phase noise of −138 dBc/Hz at 1 MHz from the carrier, using an intracavity electro-optic phase modulator. The residual phase variance is 2.5×10−8 rad2 integrated from 1 Hz to 10 kHz. This system can phase-continuously change the offset frequency within 200 ns with frequency steps up to 4 MHz. Simultaneous atom interferometers can make full use of this ultralow phase noise in differential measurements, where influences from the vibration of optics are greatly suppressed in common mode.
© 2006 Optical Society of America
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
Instrumentation, Measurement, and Metrology
Holger Müller, Sheng-wey Chiow, Quan Long, and Steven Chu, "Phase-locked, low-noise, frequency agile titanium:sapphire lasers for simultaneous atom interferometers," Opt. Lett. 31, 202-204 (2006)