G. Blume, C. Kaspari^*, D. Feise, A. Sahm, B. Sumpf, B. Eppich, and K. Paschke

Published in:

Opt. Rev., vol. 19, no. 6, pp. 395-399 (2012).

Abstract:

Flying-spot displays require light sources in the red, green and blue with a high optical output power and nearly diffraction limited beams. In this paper we present experimental results of red-emitting, AlGaInP based, tapered diode lasers and their integration into diode laser modules. The laser modules emit a collimated, almost diffraction limited beam with an optical output power as high as 1W at a wavelength close to 635 nm. The tapered laser chips were designed with emphasis on achieving a good beam quality in vertical and lateral directions of a collimated beam. To test the suitability for flying-spot display applications, we performed fiber coupling experiments with a low mode number optical fiber with an etendue as low as 6 x 10^-6 mm² sr. A maximum transmission of 70% of the launched power behind the uncoated fiber as well as a usable power in excess of 580mW were measured.

Keywords:

tapered diode laser, fiber coupling, brightness, red-emitting.

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