Fig. 4: Self-injection locking of a Fabry–Perot (FP) interband cascade laser (ICL) diode by a microresonator with integrated heaters. | Communications Physics

Fig. 4: Self-injection locking of a Fabry–Perot (FP) interband cascade laser (ICL) diode by a microresonator with integrated heaters.

From: Tunable single-mode chip-scale mid-infrared laser

Fig. 4

a Schematic of the laser setup where microheaters are turned off, and the ring is off-resonance. b Optical spectrum of the free-running state laser with multi-mode output. c Schematic of the laser setup where microheaters are turned on, and the ring is on-resonance. d Optical spectrum of the single-mode locked-state laser. The power measured at the output facet of the chip through an aspheric lens is 0.4 mW near the wavelength of 3.4 μm. laser.

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