Title :
Coherence improvement in dispersion-tuned swept laser by pulse modulation
Author :
Nagai, Hiroto ; Yamashita, Shinji
Author_Institution :
Res. Center for Adv. Sci. & Technol. (RCAST), Univ. of Tokyo, Tokyo, Japan
Abstract :
The dispersion-tuned swept laser (DTSL) is a fast and wideband swept source applicable in swept-source optical coherence tomography (SS-OCT). However, it suffers from coherence degradation at high sweep rates. The coherence in the DTSL, which can be improved by pulse modulation in place of sinusoidal modulation, is demonstrated. A coherence length of 8 mm is obtained at a sweep rate of 50 kHz using 100 ps pulse modulation.
Keywords :
laser beams; laser tuning; light coherence; optical modulation; optical tomography; coherence improvement; coherence length; dispersion-tuned swept laser; frequency 50 kHz; pulse modulation; sinusoidal modulation; swept-source optical coherence tomography; time 100 ps;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2014.2849
