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(Color online) Schematic of the waveguide writing setup using a femtosecond laser (, , ).
(Color online) Experimental setup for the measurement of SHG and the near-field intensity distribution of waveguide. The inset picture shows the fabricated waveguide by tightly focused femtosecond laser in PPLN. ECL and PC denote extended-cavity laser and polarization controller, repectively. Photographs of the PPLN sample: (a) PPLN waveguide with a width and (b) PPLN sample after selective etching by a concentrated .
Near-field mode profiles of the PPLN waveguide at the fundamental and SH wave: (a) (fundamental wave) and (b) (SH wave).
(Color online) SHG curve at room temperature . The conversion efficiency was measured to be . The wavelength of the peak and bandwidth were 1563.16 and , respectively.
The QPM wavelengths and dispersion (the index difference between the fundamental and harmonic wavelengths) values in the three different types of QPM devices.
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