Gunnar BLUME, Christian KASPARI^*, David FEISE, Alexander SAHM, Bernd SUMPF, Bernd EPPICH, and Katrin PASCHKE

Ferdinand-Braun-Institut, Leibniz Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany

(Received June 1, 2012; Revised June 25, 2012; Accepted July 13, 2012)

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 1 W 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× 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 580 mW were measured.

Key words: tapered diode laser, fiber coupling, brightness, red-emitting

^*Present address: LayTec AG, Seesener Str. 10-13, 10709 Berlin, Germany.