Open AccessCoherence improvement in dispersion‐tuned swept laser by pulse modulation
Author(s) -
Nagai H.,
Yamashita S.
Publication year - 2014
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.2849
Subject(s) - optics , coherence (philosophical gambling strategy) , laser , dispersion (optics) , modulation (music) , pulse (music) , pulse shaping , materials science , physics , acoustics , quantum mechanics , detector
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.