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 journalArticlepeer-review

9 Scopus citations


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
Issue number11
StatePublished - Mar 14 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'External-cavity tunable mid-infrared laser using off-band surface-emitting Bragg grating coupler'. Together they form a unique fingerprint.

Cite this