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External-cavity tunable mid-infrared laser using off-band surface-emitting Bragg grating coupler

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8 Author(s)
Zhang, H.L. ; Photonic Device and System Laboratory, Department of Electrical and Computer Engineering, University of Houston, Houston, Texas 77204-4005 ; Peng, C. ; Seetharaman, A. ; Luo, G.P.
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An external-cavity laser using an integrated two-segment design allows broad and continuous wavelength tuning with independent control of power and wavelength. The laser has a gain segment and a surface-emitting Bragg grating segment that was designed to be off-band for zero reflection inside the cavity, and with a strong free-space coupling to an external mirror to form a linear cavity. Wavelength control was achieved with a combination of coarse and broad wavelength tuning (140 nm) with the external mirror, and continuous, fine wavelength tuning via current-induced phase shift in the Bragg grating. Separate controls of the two segments allowed wavelength fine tuning without power variation and vice versa. The concept was applied to a 7 μm laser, and is applicable to other wavelength.

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Applied Physics Letters  (Volume:86 ,  Issue: 11 )