Gain coupling of class A semiconductor lasers
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Updated: Jun 8, 2026

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
Published on: March 20, 2015
Chris Hessenius1, Nathan Terry, Mahmoud Fallahi
1College of Optical Sciences, University of Arizona, 1630 East University Boulevard, Tucson, Arizona 85721, USA. chessenius@optics.arizona.edu
Abstract:
We report on the development of a gain-coupled class A semiconductor laser for dual-wavelength generation via optical switching. A vertical external cavity surface emitting laser (VECSEL) structure is used, because it provides a flexible platform for high-power, high-brightness output in the near-IR and visible ranges. For the first time (to our knowledge), two VECSEL cavities sharing a common gain region are studied. Because the cavities are in competition for common carriers, birefringent filters in the external cavity control the laser cavity thresholds; this configuration demonstrates the possibility of switching between the two cavities, which can operate at different wavelengths. However, in this Letter we also show, numerically and experimentally, that with the consideration of spontaneous emission, it is possible to maintain simultaneous lasing in each cavity at a different wavelength.
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