期刊
CHINESE PHYSICS B
卷 32, 期 5, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1056/acc05e
关键词
GaN beam cavity; optically pumped lasing; dynamically tunable laser source; Joule heater
In this paper, a GaN-based laser with an integrated PN junction heater on Si is fabricated. The temperature(controlled by temperature) and Joule heater provide the ability to conveniently tune the lasing properties. The device achieves optically pumped lasing with single mode and dynamic switching of its lasing mode, which may benefit future chip-based optoelectronic devices.
Dynamically tunable laser sources are highly promising for realizing visionary concepts of integrated photonic circuits and other applications. In this paper, a GaN-based laser with an integrated PN junction heater on Si is fabricated. The photoluminescence properties of the GaN beam cavity are controlled by temperature, and the Joule heater provides electrically driven regulation of temperature. These two features of the cavity make it possible to realize convenient tuning of the lasing properties. The multi-functional GaN beam cavity achieves optically pumped lasing with a single mode near 362.4 nm with a high Q-factor of 1394. The temperature of this device increases by 0-5 degrees C under the Joule heating effect. Then, electrical control of the lasing mode is demonstrated. The lasing resonant peak shows a continuous redshift of about 0.5 nm and the device also exhibits dynamic switching of its lasing mode. The lasing modulation can be ascribed to temperature-induced reduction of the bandgap. Our work may be of benefit for external optical modulation in future chip-based optoelectronic devices.
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