Extremely small vertical far-field angle of InGaAs-AlGaAs quantum-well lasers with specially designed cladding structure |
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| Authors: | Gray Lin Shun-Tung Yen Chien-Ping Lee Der-Cherng Liu |
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| Affiliation: | Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan; |
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| Abstract: | We report on a very small vertical far-field angle achieved by lasers with a specially designed structure. For an InGaAs-AlGaAs quantum-well laser with a 2.5-/spl mu/m-wide ridge waveguide, the far-field pattern has a vertical far-field angle of 13/spl deg/ and a lateral far-field angle of 8/spl deg/. Meanwhile, the threshold current remains acceptably low (/spl ap/36 mA for a 500-/spl mu/m-long cavity). The slope efficiency of the L-I characteristic is high (>0.9 W/A) compared to that of the conventional laser. |
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