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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/082/02/0313-0319

    • Keywords

       

      Mode-locking; ultrafast processes; optical susceptibility; frequency conversion; dynamics of nonlinear optical systems.

    • Abstract

       

      A comparative study in terms of optimized output power and stability is made on cascaded second-order nonlinear optical mode-locking with KTP, BBO and LBO crystals for both 1064 nm and 532 nm. Large nonlinear optical phase shift achieved in a non-phase-matched second harmonic generating crystal, is transformed into amplitude modulation through soft aperturing the nonlinear cavity mode variation at 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 the optimum performance in type-II KTP crystal. The exceptional stability achieved with KTP is accounted by simulating the mode-size variation with phase mismatch.

    • Author Affiliations

       

      Shyamal Mondal1 Satya Pratap Singh1 Sourabh Mukhopadhyay2 Aditya Date1 Kamal Hussain1 Shouvik Mukherjee1 Prasanta Kumar Datta1

      1. Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India
      2. Department of Physics, Jhargram Raj College, Jhargram 721 507, India
    • Dates

       
  • Pramana – Journal of Physics | News

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