Linewidth reduction of a distributed-feedback diode laser using an all-fiber interferometer with short path imbalance

Lee, Won-Kyu; Park, Chang Yong; Mun, Jongchul; Yu, Dai-Hyuk
July 2011
Review of Scientific Instruments;Jul2011, Vol. 82 Issue 7, p073105
Academic Journal
The linewidth of a distributed-feedback (DFB) diode laser at 1156 nm, of which free-running linewidth was 3 MHz, was reduced to 15 kHz using an all-fiber interferometer with 5-m-long path imbalance. Optical power loss and bandwidth limitation were negligible with this short optical fiber patch cord. This result was achieved without acoustic and vibration isolations, and the frequency lock could be maintained over weeks. In addition to its simplicity, compactness, robustness, and cost-effectiveness, this technique can be applied at any wavelength owing to the availability of DFB diode lasers and fiber-optic components.


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