D. Feise, J. Pohl, G. Blume, and K. Paschke

Published in:

Proc. SPIE 9382, Photonics West, San Francisco, USA, Feb. 07-12, 93820M (2015).

Abstract:

Real 3D display applications require RGB light sources which provide a spectral bandwidth of less than 5 MHz for recording (and playing-back) a holographic film. Furthermore, these emitters must be small in size, efficient, robust and reliable. Therefore, diode lasers with internal wavelength filters are the devices of choice.
In our paper, we will present a further development of our red-emitting distributed Bragg reflector ridge waveguide laser (DBR-RWL). DBR surface gratings are implemented into the 2 mm long RWL by BCl₃-Ar reactive ion etching. This fabrication process uses a single-epitaxy and is hence industry-compatible.
At a heat sink temperature of 15°C the DBR-RWL provides 120 mW of optical output power in longitudinal single mode emission. Heterodyne linewidth measurements of two identical DBR-RWL show a FWHM linewidth of less than 2 MHz. The excellent beam quality (M² = 1.1) enables the use of these chips for play-back of holographic films or as master oscillators in a future micro-integrated master oscillator power amplifier configuration for recording.

Keywords:

surface gratings, distributed Bragg reflector, diode laser, red-emitting, linewidth, holographic, 3-dimensional, display application.

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