Driven bright solitons on a mid-infrared laser chip
arxiv(2024)
摘要
Despite the ongoing progress in integrated optical frequency comb technology,
compact sources of short bright pulses in the mid-infrared wavelength range
from 3 μm to 12 μm so far remained beyond reach. The state-of-the-art
ultrafast pulse emitters in the mid-infrared are complex, bulky, and
inefficient systems based on the downconversion of near-infrared or visible
pulsed laser sources. Here we show a purely DC-driven semiconductor laser chip
that generates one picosecond solitons at the center wavelength of 8.3 μm
at GHz repetition rates. The soliton generation scheme is akin to that of
passive nonlinear Kerr resonators. It relies on a fast bistability in active
nonlinear laser resonators, unlike traditional passive mode-locking which
relies on saturable absorbers or active mode-locking by gain modulation in
semiconductor lasers. Monolithic integration of all components - drive laser,
active ring resonator, coupler, and pump filter - enables turnkey generation of
bright solitons that remain robust for hours of continuous operation without
active stabilization. Such devices can be readily produced at industrial laser
foundries using standard fabrication protocols. Our work unifies the physics of
active and passive microresonator frequency combs, while simultaneously
establishing a technology for nonlinear integrated photonics in the
mid-infrared.
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