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

H. L. Zhang, C. Peng, A. Seetharaman, G. P. Luo, Han Q. Le, Claire F. Gmachl, D. L. Sivco, A. Y. Cho

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish (US)
Article number111112
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number11
DOIs
StatePublished - Mar 14 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Zhang, H. L., Peng, C., Seetharaman, A., Luo, G. P., Le, H. Q., Gmachl, C. F., Sivco, D. L., & Cho, A. Y. (2005). External-cavity tunable mid-infrared laser using off-band surface-emitting Bragg grating coupler. Applied Physics Letters, 86(11), 1-3. [111112]. https://doi.org/10.1063/1.1885188