title: Dual colour cw mode-locking through soft aperture based on second order cascaded nonlinearity.
abstract: 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.
authors: Department of Physics, Jhargram Raj College, (Govt. of West Bengal), Jhargram, West Bengal, India.
authors: Sourabh
authors: S
authors: Mukhopadhyay
authors: Shyamal
authors: S
authors: Mondal
authors: Satya Pratap
authors: SP
authors: Singh
authors: Aditya
authors: A
authors: Date
authors: Kamal
authors: K
authors: Hussain
authors: Prasanta Kumar
authors: PK
authors: Datta