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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
Publication Date: 2002/01/01
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,
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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.