A Mode Hopping Suppressed External-Cavity Semiconductor Laser Using Feedback Control

Shigenori MATTORI  Takanori SAITOH  Shigeru KINUGAWA  Hitoshi KAMEYAMA  Toshiyuki OZAKI  Junkichi SHIRONO  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.1   pp.98-103
Publication Date: 2002/01/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Progress in Semiconductor Lasers and Light-Emitting Devices)
external-cavity laser,  semiconductor laser,  mode hopping,  

Full Text: PDF>>
Buy this Article

We have demonstrated active mode hopping suppression in external-cavity semiconductor lasers including a diffraction grating as a wavelength-selecting device. The feedback control nullifies the difference between the oscillation wavelength and selected wavelength based on observed changes in diffraction angle. The control has suppressed mode hopping over a 7.5 times wider span than without control. And when combined with conventional mode hopping suppression techniques, mode-hop-free oscillation is achieved over 130 nm. Our approach can be used for most Littman-type external-cavity semiconductor lasers with simple attachments; it will be useful for continuous wavelength sweeping and for long-term wavelength stabilization.