Title:
【発明の名称】DFB/DBRレーザーダイオードの▲フィー▼コーティング
Document Type and Number:
Japanese Patent JP2868019
Kind Code:
B2
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-Pérot) 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. According to the invention, by providing a phase layer (30) on the antireflex coating (27), the operation of the laser in a single mode is combined with a comparatively narrow line width. According to the invention, a reflective coating (35) can be applied to the phase layer (30). 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 (27), the phase layer (30) and the reflective coating (35) can be manufactured by means of not more than two materials having a suitable refractive index. According to the invention, two particularly suitable materials are hafnium oxide (28, 32) and silicon dioxide (29, 31), which can be applied to the mirror surfaces by means of the comparatively simple and attractive vapour deposition technique.
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Inventors:
PIITAA KUINDERUSUMA
UIRUMA FUAN ESUUSUPIIKUMAN
PETORASU PAURUSU HERARUDASU MORUSU
INGURITSUDO MARUBERUTEIINA FURANSU MARIETSUTE BAERE
UIRUMA FUAN ESUUSUPIIKUMAN
PETORASU PAURUSU HERARUDASU MORUSU
INGURITSUDO MARUBERUTEIINA FURANSU MARIETSUTE BAERE
Application Number:
JP16406889A
Publication Date:
March 10, 1999
Filing Date:
June 28, 1989
Export Citation:
Assignee:
KONIN* FUIRITSUPUSU EREKUTORONIKUSU NV
International Classes:
H01S5/028; H01S5/00; H01S5/12; H01S5/227; (IPC1-7): H01S3/18
Domestic Patent References:
| JP6481383A | ||||
| JP62221175A | ||||
| JP59232477A | ||||
| JP61134094A | ||||
| JP5727213A | ||||
| JP62209886A |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)