Title :
Indistinct threshold laser operation in a pnpn vertical to surface transmission electrophotonic device with a vertical cavity
Author :
Numai, Takahiro ; Kosaka, Hideo ; Ogura, Ichiro ; Kurihara, Kaori ; Sugimoto, Mitsunori ; Kasahara, Kenichi
Author_Institution :
NEC Corp., Ibaraki, Japan
fDate :
2/1/1993 12:00:00 AM
Abstract :
The vertical to surface transmission electrophotonic device has a laser cavity covered with plated gold, which has high reflectivity. The laser light is emitted from the distributed Bragg reflector (DBR) with no gold. Consequently, spontaneous emission remains in the laser cavity, and the carriers are regenerated. The injected carriers are converted to light and spontaneous emission is reconverted to carriers. Due to photon recycling, threshold current density decreases and indistinct threshold laser operation is obtained. In the indistinct threshold operation, the light output is linearly polarized. The submode suppression ratio is larger than 25 dB, and the divergence angle of a far field is as narrow as 6.8°. The indistinct threshold laser characteristics lead to high slope efficiency in low current level. To achieve high slope efficiency in the overall current level, DBR mirrors are designed, and high slope efficiency of 0.32 mW/mA is obtained
Keywords :
current density; distributed Bragg reflector lasers; laser cavity resonators; semiconductor lasers; DBR mirrors; distributed Bragg reflector; divergence angle; far field; high reflectivity; high slope efficiency; indistinct threshold laser operation; injected carriers; laser cavity; linearly polarised light output; low current level; photon recycling; plated Au; pnpn vertical to surface transmission electrophotonic device; spontaneous emission; submode suppression ratio; threshold current density; vertical cavity; Distributed Bragg reflectors; Gold; Mirrors; Optical polarization; Recycling; Reflectivity; Spontaneous emission; Surface emitting lasers; Threshold current; Vertical cavity surface emitting lasers;
Journal_Title :
Quantum Electronics, IEEE Journal of
