Hello, I am kindly asking for some help with following theoretical problem. Imagine at least two lasers emitting light at certain wavelength, each from different angle. Imagine that the rays cross at some point. Is is possible to observe at the crossing point light of different wavelength than the wavelength of each laser? In other words, is it possible to achieve light of higher energy while combining two lower energy lasers at the point of their contact? Thank you for clarification and/or sources.