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Proceedings Paper

High-power multi-FO-lasers hosted on a THS
Author(s): Maurizio Checchetti
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Paper Abstract

The Turbo Heat Sink / THS, an effective forced-air cooler for electronic systems, handles large flows of air and energy. Can be made of AlN, a ceramic sporting low TCE and high thermal conductivity, like Al. The deep, curved air-cooling channels are milled before firing; later, the mounting plane and more linear grooves are ground. Once covered with multilayer tracks, the mounting plane can solder directly the IC dices and many Laser Diodes / LDs. The hybrid electronics includes IO, drivers, controls, Opto and thermal sensors. The grooves, part of a semi-kinematic positioning system, seat and locate accurately the coupling optics and eventually the hot-end of each lasing FO. A standard pick-and-place mounts the IC dices and later fits the LDs, soldered faster at lower temperature. A window closes the hermetic chamber. If the FOs are placed outside, the window integrates a lens array. Side Pumping. The well spaced, regular field of LDs can mate with simple beam-forming lenses, typically cylindrical and shared. Each beam, optimally focused and steered, crosses the D-flat to reach the lasing core of a FO. For Telecom, a central unit with many spare LDs and FOs boosts reliability, is open to expansion and can host more functions. A large engine is much better than many boards full of pigtailed cases or butterflies without any explicit cooling means. Bragg mirrors mounted on integral thermal bridges can shift / select each wavelength. In the general case, air or gas cools the FO coils. An universal engine with outer lasing-FOs can be customised later. End Pumping. The substantially cost-free vertical space can be uses to collimate and bend more beams to center each exposed FO-end, potentially more refined. A geometric coupling is ë insensitive. In both cases, few shared, miniature, uniaxial, low cost optical elements are mounted collectively on a tested THS.

Paper Details

Date Published:
PDF: 11 pages
Proc. SPIE 6453, Fiber Lasers IV: Technology, Systems, and Applications, 645327; doi: 10.1117/12.705145
Show Author Affiliations
Maurizio Checchetti, Microptronics Srl (Italy)

Published in SPIE Proceedings Vol. 6453:
Fiber Lasers IV: Technology, Systems, and Applications
Donald J. Harter; Andreas Tünnermann; Jes Broeng; Clifford Headley, Editor(s)

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