Open AccessDual colour cw mode-locking through soft aperture based on second order cascaded nonlinearity
Author(s) -
Sourabh Mukhopadhyay,
Shyamal Mondal,
Shalini Singh,
Aditya Date,
Kamal Hussain,
Prasanta Kumar Datta
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.000454
Subject(s) - optics , laser , mode locking , materials science , nonlinear system , pulse duration , second harmonic generation , power (physics) , nonlinear optics , modulation (music) , amplitude , pulse width modulation , physics , quantum mechanics , acoustics
Large nonlinear phase shift achieved by exploiting intracavity second order cascaded nonlinear process in a non-phasematched second harmonic generating crystal is transformed into amplitude modulation through soft aperturing the nonlinear cavity mode variation within the laser gain medium to mode-lock a Nd:YVO4 laser. The laser delivers stable dual wavelength cw mode-locked pulse train with pulse duration 10.3 ps and average power of 1.84 W and 255 mW at 1064 nm and 532 nm respectively for a pump power of 12 W. A comprehensive theoretical analysis finds the regime of self starting and stable cascaded second order mode-locking, inconformity with the experimental result.