August 22, 2022

Researchers, based at EPFL Lausanne, achieved a laser intrinsic blinewidth of ~1.15 MHz and more than 100x reduction in optical noise. These compact light sources are the key for quantum computing or for use in atomic clocks. laserfocusworld.com reports …

“The researchers used Exalos blue and green laser diodes and butt-coupled the devices to a Si3N4 photonic integrated circuit with a high-quality factor microresonator for optical feedback and mode selection. Through self-injection locking, the laser diode operates on a single longitudinal mode with a measured linewidth at 461.8 nm, for example, of ~1.15 MHz, which is comparable to the performance achieved from external cavity diode lasers using bulk optical elements …”
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