Tailoring and tuning of the broadband spectrum of a step-chirped grating based frequency doubler using tightly-focused Gaussian beams | Zendy

Ameneh Bostani | Zendy; Meenu Ahlawat | Zendy; Amirhossein Tehranchi | Zendy; Roberto Morandotti | Zendy; Raman Kashyap | Zendy

Open Access

Tailoring and tuning of the broadband spectrum of a step-chirped grating based frequency doubler using tightly-focused Gaussian beams

Author(s) -

Ameneh Bostani,

Meenu Ahlawat,

Amirhossein Tehranchi,

Roberto Morandotti,

Raman Kashyap

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.21.029847

Subject(s) - optics , grating , apodization , ripple , wideband , chirp , bandwidth (computing) , broadband , materials science , sideband , narrowband , physics , laser , telecommunications , computer science , quantum mechanics , voltage , microwave

We demonstrate theoretically and experimentally, that the non-uniform spectra of second harmonic generation (SHG) from an unapodized step-chirped periodically poled nonlinear optical grating can be apodized utilizing tightly-focused Gaussian beams to suppress the ripple in its wideband response. In our example, by increasing focusing, a ripple-free response is progressively achieved over a 6-dB bandwidth of >5 nm, with a beam waist of 20 µm. With this tight focusing arrangement, a continuous tuning of 11-nm is also demonstrated by simply changing the focal point by 5.8 mm within the step-chirped grating based APPLN.

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