Dual frequency laser with two continuously and widely tunable frequencies for optical referencing of GHz to THz beatnotes
Abstract
A dual-frequency 1.55 μm laser for CW low noise microwave, millimeter and sub millimeter wave synthesis is demonstrated, where frequency stabilization is possible on each wavelength independently. The solid state Er:Yb laser output power is 7 mW. The amplitude noise is −150 dBc/Hz at 1 MHz offset frequency. In free running regime, the frequency noise is 3.10^5/f Hz/sqrt(Hz) (800 Hz on a 1μs timescale), better than commercial fibered or semi-conductor sources at this wavelength.
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