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Schematic diagram of the external-cavity configuration with a GaInN LD device. LD denotes laser diode, L denotes lens, BPF denotes optical band-pass filter, M denotes mirror, and ISO denotes optical isolator. The inset shows a schematic diagram of GaInN LD structure.
The rf power spectra of the output optical pulses from the external-cavity GaInN LD during (a) passive mode-locking operation with a dc injection current of 85 mA and (b) hybrid mode-locking operation with rf current modulation.
Temporal waveforms of the optical pulses generated by (a) passive and (b) hybrid mode locking, measured by the streak camera operated in single-shot measurement mode. The insets show the corresponding optical spectra.
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