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Far field pattern measured along the boundary apart from the perimeter.
Output power depending on the pumping current at two different points. Inset (a) is the measurement of the laser output from the notch, inset (b) the measurement far from the notch, and inset (c) the enlarged scale of the output power. Arrows in insets (a) and (b) indicate the position where the notch is. Line A and B are the output power at (a) and (b), respectively.
Optical spectra of laser outputs at two different points depending on the injection current. The left column is the spectrum at notch [inset (a) in Fig. 2] and the right far from the notch [inset (b) in Fig. 2]. (a) and (b) are the spectra at 22 mA injection current, (c) and (d) at 27 mA, (e) and (f) at 40 mA, and (g) and (h) the enlarged scale of (e) and (f), respectively. The horizontal arrows indicate the mode spacing of and the vertical arrows indicate the positions where QSRMs are generated for high pumping current.
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