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Optical spectrum of the slotted laser for and . Inset: schematic of slotted laser structure.
(Density of data points reduced for clarity.) Time variation of the amplitude of the first two modes as a function of time measured with a FROG. The laser is biased at and its temperature is set at . The crosses correspond to the experimental measurements and the continuous line to the fit of sinusoidal wave. The origin of time is arbitrary.
(a) Terahertz spectrum for a bias current of . (b) Evolution of the terahertz signal for the second harmonic at as a function of the bias current. For both figures the device is temperature controlled at .
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