Supermode control and phase front measurements of phase-locked offset-coupled laser arrays with a large optical waveguide structure
Phase-locked array lasers with large optical waveguide structures are demonstrated. The refractive index guides of each laser are evanescently coupled with and without offset-coupling structure. An evanescently coupled three-element laser array without offset coupling regions emits up to 200 mW and an offset-coupled laser array with a 4/5 element emits up to 150 mW under pulsed operation. Both laser arrays emit with all elements in-phase locked and produce a single narrow far-field lobe. The full widths at half maximum of the three-element and 4/5-element laser arrays are 5/degree/ and 2.5/degree/, respectively. In phase measurements of the lobe of the 4/5-element laser array, we find that the root-mean-square aberration is less than 0.11lambda under pulsed operation. This phase aberration is constant with varying power from 75 to 150 mW.
- Research Organization:
- Research Laboratory, Oki Electric Industry Co., Ltd., 550-5 Higashiasakawa, Hachioji, Tokyo 193, Japan(JP)
- OSTI ID:
- 5915950
- Journal Information:
- J. Appl. Phys.; (United States), Vol. 66:3
- Country of Publication:
- United States
- Language:
- English
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