Master-oscillator power-amplifier in the red spectral range for holographic displays
G. Blume, J. Pohl, D. Feise, J. Wiedmann, P. Ressel, B. Eppich, A. Sahm, A. Ginolas, O. Nedow, M. Jendrzejewski, P. Johne, J. Hofmann, M. Schiemangk, B. Sumpf, G. Erbert, and K. Paschke
Proc. SPIE 9770, Photonics West, San Francisco, USA, Feb. 13-18, 97700E (2016).
RGB-light sources with a coherence length of several meters are required for holographic displays. Furthermore, these emitters must feature a high luminance and must be sufficiently small in size, to be employed in today’s consumer market products. Therefore, an all-semiconductor based solution is preferred.
We developed red-emitting semiconductor lasers at 635 nm and 647 nm with internal distributed Bragg reflectors and suitable amplifiers at these wavelengths to boost the lasers output power. We investigated tapered amplifiers containing a ridge-waveguide section as well as truncated tapered designs in master-oscillator power-amplifier configuration (MOPA). This allowed the generation of diffraction limited single mode emission by the MO-chip and subsequent amplification of the radiation by the PA-chip by more than 10 dB, without significantly degrading the coherence properties. We successfully demonstrated an optical output power of more than 300 mW at 635 nm and 500 mW at 647 nm. The radiation featured a linewidth below 10 MHz, which corresponds to a coherence length of at least several meters, well suited for a holographic system.
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
Master-oscillator power-amplifier, holographic, 3-dimensional, display application, distributed Bragg reflector, diode laser, red-emitting, linewidth, coherence length.
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