US4872176A
Expired / Lapsed
US
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Device and method for monitoring a light-emitting device
Assignee: General Electric Co
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Filing: 1988-04-25
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Granted: 1989-10-03
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Expires: 2008-04-25
Abstract
Abstract A light emitting device which has a substrate and a cavity region overlying the substrate. The cavity region has a grating region overlying exposed portions of the surface formed of a first grating region having a first period and a second grating region having a period different from the first region. On other portions of the cavity region an active region overlies the cavity layer and a capping layer overlies the active region. The device is monitored by forming a surface emitting device with first and second gratings with the gratings having different periods. Current is applied to the device such that radiation is emitted from the grating and the output is detected from the second grating such that the current to the device is adjusted based on the output of the second grating.
Inventors
- 👤 Jacob M. Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:55
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/105; H01S3/1055; H01S5/00; H01S5/10; H01S5/12; H01S5/125; H01S5/18; H01S5/185; H01S5/187; H01S5/1206; H01S5/1215
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
88 words
A surface emitting device comprising: a substrate; a large optical cavity region overlying the substrate having first and second areas; an active region overlying said first area of the large optical cavity region; a capping layer overlying said active region; means for electrically contacting said substrate and said capping layer; a grating region overlying said second area of said large optical cavity region having a first grating region having a first periodic length and a second grating region having a periodic length different from said first grating region.
Claim 2
Dependent Claim
88 words
A surface emitting device comprising: a substrate; a large optical cavity region overlying the substrate having first and second areas; an active region overlying said first area of the large optical cavity region; a capping layer overlying said active region; means for electrically contacting said substrate and said capping layer; a grating region overlying said second area of said large optical cavity region having a first grating region having a first periodic length and a second grating region having a periodic length different from said first grating region.
Claim 3
Dependent Claim
11 words
The device of claim 1 wherein said device is a laser.
Claim 4
Dependent Claim
15 words
The device of claim 1 wherein said device is an array of radiation emitting devices.
Claim 5
Dependent Claim
23 words
The device of claim 1 wherein the period of said second grating region is greater than the period of said first grating region.
Claim 6
Dependent Claim
16 words
The device of claim 1 wherein said second grating region is adjacent said first grating region.
Claim 7
Dependent Claim
25 words
The device of claim 1 wherein at least a portion of said first grating region overlies at least a portion of said second grating region.
Claim 8
Dependent Claim
139 words
An array of surface emitting devices comprising: a substrate; a large optical cavity region overlying the substrate; a first active region overlying a first portion of the large optical cavity region; a second active region overlying a second portion of the large optical cavity region; a first capping layer overlying said first active region; a second capping layer overlying said second active region; means for electrically contacting said substrate and said first and second capping layers; a first grating region overlying said large optical cavity region between said first and second active regions, said first grating region formed of a plurality of substantially equally spaced grating elements; a second grating region overlying said large optical cavity region, said first grating region formed of a plurality of elements which have a spacing between elements different from said first grating region.
Claim 9
Dependent Claim
139 words
An array of surface emitting devices comprising: a substrate; a large optical cavity region overlying the substrate; a first active region overlying a first portion of the large optical cavity region; a second active region overlying a second portion of the large optical cavity region; a first capping layer overlying said first active region; a second capping layer overlying said second active region; means for electrically contacting said substrate and said first and second capping layers; a first grating region overlying said large optical cavity region between said first and second active regions, said first grating region formed of a plurality of substantially equally spaced grating elements; a second grating region overlying said large optical cavity region, said first grating region formed of a plurality of elements which have a spacing between elements different from said first grating region.
Claim 10
Dependent Claim
12 words
The array of claim 7 wherein said array is a laser array.
Claim 11
Dependent Claim
16 words
The array of claim 7 wherein said first grating region is adjacent said second grating region.
Claim 12
Dependent Claim
25 words
The array of claim 7 wherein at least a portion of said first grating region overlies at least a portion of said second grating region.
Claim 13
Dependent Claim
19 words
The array of claim 7 wherein said second grating has a spacing between elements greater than said first grating.
Claim 14
Independent Claim
99 words
A method for monitoring the output of a light emitting device comprising the steps of: forming a surface emitting device having a first grating where radiation is emitted having about the same period between elements and a second grating having a period different from said first grating, said device having an active region and a means for electrically contacting the device; applying current to said device such that radiation is emitted from said first and second gratings; detecting said output from said second grating; adjusting the current to said device based on the detected output of said second grating.
Claim 15
Independent Claim
99 words
A method for monitoring the output of a light emitting device comprising the steps of: forming a surface emitting device having a first grating where radiation is emitted having about the same period between elements and a second grating having a period different from said first grating, said device having an active region and a means for electrically contacting the device; applying current to said device such that radiation is emitted from said first and second gratings; detecting said output from said second grating; adjusting the current to said device based on the detected output of said second grating.
Claim 16
Dependent Claim
31 words
The method of claim 12 wherein said surface emitting device is an array and the step of detecting said output further comprises the step of detecting the output from the array.
Claim 17
Dependent Claim
55 words
The method of claim 12 wherein the output of said second grating has an optical axis of emitter radiation, the step of detecting said output further comprises the steps of: positioning a detecting device having a substantially planar receiving surface such that said receiving surface is about perpendicular to the optical axis of emitted radiation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |