Coherent light generators – Particular active media – Semiconductor
Patent
1989-06-26
1990-08-21
Sikes, William L.
Coherent light generators
Particular active media
Semiconductor
350164, 372 96, H01S 319
Patent
active
049512927
ABSTRACT:
In DFB/DBR semiconductor diode lasers, competition may arise between the DFB (Distributed Feed-Back) mode corresponding to the period of the grid present and the FP (=Fabry-Perot) mode determined by the relative distance of the mirror surfaces, as a result of which the laser does not operate in one single mode. By providing an antireflex layer, this problem is suppressed, but other disadvantages are obtained, such as a large line width. However, by providing a phase layer on the antireflection coating, the operation of the laser in a single mode is combined with a comparatively narrow line width. Furthermore, a reflective coating can be applied to the phase layer. In this case, both the module and the phase of the effective reflection can be adjusted substantially independently of each other, as a result of which a narrow line width and SLM can be more readily combined.
The antireflex coating, the phase layer and the reflective coating can be manufactured by means of not more than two materials having a suitable refractive index. Two particularly suitable materials are hafnium oxide and silicon dioxide, which can be applied to the mirror surfaces by means of the comparatively simple and attractive vapor deposition technique.
REFERENCES:
patent: 4387960 (1983-06-01), Tani
patent: 4833684 (1989-05-01), Krekels et al.
Baele Ingrid A. F. M.
Kuindersma Pieter I.
Mols Petrus P. G.
Van Es-Spiekman Wilma
Biern Steven R.
Epps Georgia Y.
Sikes William L.
U.S. Philips Corp.
LandOfFree
Coating for DFB/DBR laser diodes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coating for DFB/DBR laser diodes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coating for DFB/DBR laser diodes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1684526