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We report on phase-locking of two continuous wave infrared laser sourcesseparated by 100 THz emitting around 1029 nm and 1544 nm respectively. Ourapproach uses three independent harmonic generation processes of the IR laserfrequencies in periodically poled MgO: LiNbO3 crystals to generate second andthird harmonic of that two IR sources. The beat note between the twoindependent green radiations generated around 515 nm is used to phase-lock oneIR laser to the other, with tunable radio frequency offset. In this way, thewhole setup operates as a mini frequency comb (MFC) emitting four intenseoptical radiations (1544 nm, 1029 nm, 772 nm and 515 nm), with output powers atleast 3 orders of magnitude higher than the available power from each modeemitted by femtosecond lasers.

Optical phase locking of two infrared CW lasers separated by 100 THz