Coherent light generators – Particular beam control device – Mode discrimination
Reexamination Certificate
2005-03-01
2005-03-01
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular beam control device
Mode discrimination
C372S009000, C372S043010, C372S045013, C372S054000
Reexamination Certificate
active
06862300
ABSTRACT:
Semiconductor laser diodes, particularly high power ridge waveguide laser diodes, are often used in opto-electronics as so-called pump laser diodes for fiber amplifiers in optical communication lines. To provide the desired high power output and stability of such a laser diode and avoid degradation during use, the present invention concerns an improved design of such a device, the improvement in particular consisting in a way of suppressing the undesired first and higher order modes of the laser which consume energy and do not contribute to the optical output of the laser, thus reducing it's efficiency. Essentially, the novel effect is provided by a structure comprising CIG—for Complex Index Guiding—elements on top of the laser diode. These CIG elements consist of one or a plurality of layers and must contain at least one layer which provides the optical absorption of undesired modes of the lasing wavelength and preferably contains an insulating layer as a first contact layer to the semiconductor. The CIG elements may be specifically shaped, both in thickness and coverage of the laser's semiconductor body, to provide desired suppression characteristics. Further, the CIG elements may be combined with the contact layer usually providing the electrical input power to the laser diode.
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International Search Report regarding International Application No. PCT/IB03/03929 mailed Dec. 17, 2003.
Schmidt Berthold
Sverdlov Boris
Thies Achim
Traut Silke
Bookham Technology plc
Harvey Minsun Oh
Renner , Otto, Boisselle & Sklar, LLP
Rodriguez Armando
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