Since the advent of lasers,high order multiphoton upconversion processes(HOMUPs)have been widely investigated throughout the scientific community owing to their great fundamental significance and numerous applications in short wavelength light generation,optical imaging,and spectroscopy.Especially,upconversion pumping by means of intrinsic energy level matching of certain rare-earth(RE)ions plays a significant role in achieving short-wavelength light,due to ample availability of high power semiconductor diode lasers in the near-infrared Since the advent of lasers, high order multiphoton upconversion processes (HOMUPs) have been widely focused throughout the scientific community owing to their great fundamental significance and numerous applications in short wavelength light generation, optical imaging, and spectroscopy. Especially since upconversion pumping by means of intrinsic energy level matching of certain rare-earth (RE) ions plays a significant role in achieving short-wavelength light, due to ample availability of high power semiconductor diode lasers in the near-infrared