Research / 2021 / Article / Fig 4

Research Article

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

Figure 4

Upconversion supercontinuum generation when incident pump waves are ordinary lights. (a) Photographs of upconversion spot, (b) the corresponding 1st-order diffraction beam, and (c) normalized supercontinuum spectra emitted from the CPPLN sample at specific central wavelength of femtosecond pump source 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 397-860 nm, 400-888 nm, 360-905 nm, 350-910 nm, 350-900 nm, 360-900 nm, and 363-905 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. On the other hand, a notable feature in this case is the existence of a high efficiency band at 800-900 nm.