Chirped grating surface emitting distributed feedback semiconductor laser
Patent
·
OSTI ID:6128429
In a surface emitting distributed semiconductor laser device having a structure of dielectric, metal, and semiconductor material layers, including a positively doped semiconductor cladding layer having a grating etched onto its surface, said grating having a plurality of grating grooves, the improvement comprising: a chirp in said grating for reducing a destructive interference in a pair of opposing, second order diffracted photon fields, wherein said grating is a second order having a linearly varying chirp each of said second order grating grooves being substantially parallel to each other and each of said grating groove walls also being substantially parallel with each other and wherein said second order linearly varying chirp is optimally expressed by an equation, wherein A is a nominal grating periodicity, L is a length of an ohmic contact at a surface of said grating, C is a constant that represents a degree of said chirp, and Z is said coordinate line normal to said grating groove walls, whereby a longitudinal mode far-field output intensity profile of said laser device is single lobed and said laser device has a high power efficiency.
- Assignee:
- Hughes Aircraft Co., Los Angeles, CA (United States)
- Patent Number(s):
- US 5241556; A
- Application Number:
- PPN: US 7-826720
- OSTI ID:
- 6128429
- Country of Publication:
- United States
- Language:
- English
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