The phasehyphen;locking characteristics of two coupled, ridge waveguide InP/InGaAsP diode lasers emitting at 1.2 mgr;m were investigated experimentally. The phase locking of the lasers was verified by the observation of phasehyphen;locked modes (supermodes) in the spectrally resolved near fields and distinct diffraction patterns in the far field. By independent control of the laser currents it was possible to vary continuously the mutual phase shift between the two phasehyphen;locked lasers and thus steer the farhyphen;field diffraction lobes. In addition, the separate current control could be utilized to obtain single longitudinal mode oscillation of the phasehyphen;locked lasers. Variation in one of the laser currents resulted then in tuning of the wavelength of this single mode over a range of 90 Aring;.
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