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

Zhang, H. L.; Peng, C.; Seetharaman, A.; Luo, G. P.; Le, Han Q.; Gmachl, C.; Sivco, D. L.; Cho, A. Y.
March 2005
Applied Physics Letters;3/14/2005, Vol. 86 Issue 11, p111112
Academic Journal
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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