Research / 2021 / Article / Fig 3

Research Article

White Laser Realized via Synergic Second- and Third-Order Nonlinearities

Figure 3

Upconversion supercontinuum generation when incident pump lasers are extraordinary lights. (a) Photograph of the sample setup with a dazzling output spot. (b) Photographs of upconversion spots. (c) The 1st-order diffraction beam and (d) supercontinuum spectra (normalized against the peak intensity) emitted from the CPPLN sample under the pump of femtosecond pulse laser with the central wavelength ranging from 1200 to 1500 nm. Here, the white laser under the pump of FW femtosecond laser with the central wavelengths 1200, 1250, 1300, 1350, 1400, 1450, and 1500 nm is found to involve a series of vis-NIR bands covering approximately 393-860 nm, 400-880 nm, 370-902 nm, 391-905 nm, 366-900 nm, 370-900 nm, and 360-905 nm, respectively, as estimated by a criterion of 20 dB. In short, the spectra of output white laser cover a series of vis-NIR bands ranging approximately from 400 to 900 nm in all cases of FW pump laser.