A comparative study on dual colour soft aperture cascaded second-order mode-locking with different nonlinear optical crystals

Pramana

Satya Pratap Singh²  Prasanta Kumar Datta1²  Sourabh Mukhopadhyay¹  Kamal Hussain²  Shouvik Mukherjee²  Shyamal Mondal²  Aditya Date² 

[1] Department of Physics, Jhargram Raj College, Jhargram 721 507, India$$;Department of Physics, Indian Institute of Technology Kharagpur, Kharagpur 721 302, India$$

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

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown