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2010-11-30T20:11:47+01:00
2010-11-04T01:33:39Z
2010-11-30T20:11:47+01:00
Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0647995-A1-19950412
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EP-0647995-A1-19950412
The invention increases the tuning range of a laser (14) by altering the output coupler (16) reflectivity. In a first embodiment of the invention, the tuning range of an external cavity laser (27, 14, 24, 26) is increased by applying a substantially spectrally flat reflective coating (64, 66, 68) to the front facet (16) of a semiconductor laser (14) which has higher reflectivity than the uncoated front facet. In addition to increasing the tuning range, the increased reflectivity of the front facet reduces the laser threshold current for all laser wavelengths. In a second embodiment of the invention, various complex coatings (70, 72) were applied to the output coupler (40) to generate reflective characteristics that change according to wavelength. The complex coatings (40) enhance reflectance at the edges of the laser tuning curve without adversely affecting the output power at the center wavelengths. This further increases the tuning range of the laser while simultaneously maintaining high output power for each selected output wavelength.
The invention increases the tuning range of a laser (14) by altering the output coupler (16) reflectivity. In a first embodiment of the invention, the tuning range of an external cavity laser (27, 14, 24, 26) is increased by applying a substantially spectrally flat reflective coating (64, 66, 68) to the front facet (16) of a semiconductor laser (14) which has higher reflectivity than the uncoated front facet. In addition to increasing the tuning range, the increased reflectivity of the front facet reduces the laser threshold current for all laser wavelengths. In a second embodiment of the invention, various complex coatings (70, 72) were applied to the output coupler (40) to generate reflective characteristics that change according to wavelength. The complex coatings (40) enhance reflectance at the edges of the laser tuning curve without adversely affecting the output power at the center wavelengths. This further increases the tuning range of the laser while simultaneously maintaining high output power for each selected output wavelength.
en
European Patent Office
EP0647995
EP 0647995
H01S 03/105
H01S 03/085
Optimizing output characteristics of a tunable external cavity laser
Optimizing output characteristics of a tunable external cavity laser - European Patent Office - EP 0647995 A1
Optimizing output characteristics of a tunable external cavity laser - European Patent Office - EP 0647995 A1
Adobe PDF Library 8.0
"EP0647995"; "EP 0647995"; "H01S 03/105"; "H01S 03/085"; "Optimizing output characteristics of a tunable external cavity laser"
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17
EP
0647995
A1
1995-04-12
94307263
1994-10-04
US
134424
1993-10-08
H01S 03/105
H01S 03/085
Hewlett-Packard Company
Fouquet, Julie E.
Braun, David M.
Williams, John Francis et al
Optimizing output characteristics of a tunable external cavity laser
Optimierung der Emissionscharakteristik eines Lasers mit externem Resonator
Optimizing output characteristics of a tunable external cavity laser
Optimalisation de caractéristiques d'émission d'un laser accordable à cavité externe
The invention increases the tuning range of a laser (14) by altering the output coupler (16) reflectivity. In a first embodiment of the invention, the tuning range of an external cavity laser (27, 14, 24, 26) is increased by applying a substantially spectrally flat reflective coating (64, 66, 68) to the front facet (16) of a semiconductor laser (14) which has higher reflectivity than the uncoated front facet. In addition to increasing the tuning range, the increased reflectivity of the front facet reduces the laser threshold current for all laser wavelengths. In a second embodiment of the invention, various complex coatings (70, 72) were applied to the output coupler (40) to generate reflective characteristics that change according to wavelength. The complex coatings (40) enhance reflectance at the edges of the laser tuning curve without adversely affecting the output power at the center wavelengths. This further increases the tuning range of the laser while simultaneously maintaining high output power for each selected output wavelength.
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