Surface-emitting, single-lobe operation from second-order distributed-reflector lasers with central grating phaseshift
Identifieur interne : 010034 ( Main/Repository ); précédent : 010033; suivant : 010035Surface-emitting, single-lobe operation from second-order distributed-reflector lasers with central grating phaseshift
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Abstract
Surface-emitting diode lasers containing a second-order Bragg grating with a central phaseshift, Δ, of values around π are found to fundamentally favor lasing in a mode of symmetric near-field amplitude profile, which in turn provides emission in a single-lobed beam orthonormal to the surface. Devices of 500 μm long distributed-feedback (DFB) active region (λ=0.98μm) and 500 μm long distributed feedback reflector passive regions provide, for Δ=π, a surface-emitted beam pattern with 88% central-lobe power content, and external differential quantum efficiency, ηD, of 51%. Since the guided field is antisymmetric to start with, and a central π phaseshift causes two grating-outcoupled beams to be out-of-phase with each other, the net result is a single-lobed far-field pattern. The guided-field peak-to-valley (intensity) ratio, R, in the active (i.e., DFB) region is only 2, which insures single-mode operation to high powers, since the intermodal discrimination is high (≥100 cm-1). Over a wide range in Δ:60°; ηD remains high (>50%) and the degree of guided-field uniformity remains low (R<2). © 2001 American Institute of Physics.
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Devices of 500 μm long distributed-feedback (DFB) active region (λ=0.98μm) and 500 μm long distributed feedback reflector passive regions provide, for Δ=π, a surface-emitted beam pattern with 88% central-lobe power content, and external differential quantum efficiency, η<sub>D</sub>, of 51%. Since the guided field is antisymmetric to start with, and a central π phaseshift causes two grating-outcoupled beams to be out-of-phase with each other, the net result is a single-lobed far-field pattern. The guided-field peak-to-valley (intensity) ratio, R, in the active (i.e., DFB) region is only 2, which insures single-mode operation to high powers, since the intermodal discrimination is high (≥100 cm-1). Over a wide range in Δ:60°; η<sub>D</sub> remains high (>50%) and the degree of guided-field uniformity remains low (R<2). © 2001 American Institute of Physics.</div> </front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0003-6951</s0></fA01><fA02 i1="01"><s0>APPLAB</s0></fA02><fA03 i2="1"><s0>Appl. phys. lett.</s0></fA03><fA05><s2>78</s2></fA05><fA06><s2>26</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Surface-emitting, single-lobe operation from second-order distributed-reflector lasers with central grating phaseshift</s1></fA08><fA11 i1="01" i2="1"><s1>WITJAKSONO (Gunawan)</s1></fA11><fA11 i1="02" i2="1"><s1>BOTEZ (Dan)</s1></fA11><fA14 i1="01"><s1>Reed Center for Photonics, University of Wisconsin, Madison, Wisconsin 53706</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ></fA14><fA20><s1>4088-4090</s1></fA20><fA21><s1>2001-06-25</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>10020</s2></fA43><fA44><s0>8100</s0><s1>© 2001 American Institute of Physics. 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Since the guided field is antisymmetric to start with, and a central π phaseshift causes two grating-outcoupled beams to be out-of-phase with each other, the net result is a single-lobed far-field pattern. The guided-field peak-to-valley (intensity) ratio, R, in the active (i.e., DFB) region is only 2, which insures single-mode operation to high powers, since the intermodal discrimination is high (≥100 cm-1). 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