3 April 2003 Integrated optical DBR- and DFB-lasers in Er:LiNbO3 with photorefractive gratings
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A family of narrow linewidth integrated optical distributed Bragg reflector- (DBR-), distributed feedback- (DFB-), and DBR-/DFB-coupled cavity lasers with Er-doped LiNbO3 single-mode waveguide is reviewed. They have one or two photorefractive gratings in Fe-doped waveguide sections. Two types of DBR-lasers have been developed. The first type has a cavity consisting of one Bragg-grating in a Ti:Fe:LiNbO3 waveguide, a gain section with Ti:Er:LiNbO3 waveguide, and a multi-layer dielectric mirror deposited on one polished end face. The second DBR-cavity consists of two gratings in Ti:Fe:LiNbO3 on both sides of the Er-doped waveguide. Their power characteristics and spectral properties were investigated. Single-frequency operation could be achieved in the latter case at various wavelengths in the Er-band (1530nm <λ< 1575nm) with up to 1.12mW output power. A DFB-laser with two lowest-order modes has been demonstrated with a photorefractive grating in a Ti:Fe:Er:LiNbO3 waveguide; it is combined with an integrated optical amplifier on the same substrate. Moreover, an attractive DBR/DFB coupled cavity laser has been developed and investigated. Its cavity consists of a photorefractive Bragg grating in the Ti:Fe:Er:LiNbO3 waveguide section close to one end face of the sample, a Ti:Er:LiNbO3 gain section and a broadband dielectric multi-layer mirror of high reflectivity on the other end face.
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Bijoy Krishna Das, Bijoy Krishna Das, Christian Becker, Christian Becker, Thomas Oesselke, Thomas Oesselke, Raimund Ricken, Raimund Ricken, Viktor Quiring, Viktor Quiring, Hubertus Suche, Hubertus Suche, Wolfgang Sohler, Wolfgang Sohler, "Integrated optical DBR- and DFB-lasers in Er:LiNbO3 with photorefractive gratings", Proc. SPIE 4944, Integrated Optical Devices: Fabrication and Testing, (3 April 2003); doi: 10.1117/12.468300; https://doi.org/10.1117/12.468300

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