Fig. 2: Evaluation of signal spectra.
a Signal spectra generated by the first SPDC process in the ppKTP crystal for several crystal temperatures. The spectrum is tunable over 270 cm−1-width by controlling the temperature. b Signal power vs. pump power. The blue points are the measurements, and the sky-blue line is the curve fitting the first 10 data points. The fitting function is \(y=A{\sinh }^{2}(B\sqrt{x})\), with A = 5.1 × 10−19 and B = 25 being the fitting parameters. The X- and Y-error bars indicate the standard deviation of the pump and signal powers, respectively. c Measured (solid blue) and simulated (dotted sky-blue) signal spectra generated from the apKTP crystal at ambient temperature.
