Lasers are of military usefulness by all nations for range finding, target designation and tracking.
They may also be used as weapons for harassment and physical injury of opposing forces. Thus, only a single wavelength is produced when an electron in a given molecule returns to its basal state. If that light is collimated by mirrors into a unidirectional beam, it will tend to retain its energy until dissipated by distance through the atmosphere, each wavelength absorbed by the atmosphere at different rates. So, some wavelengths will retain their energy and focus over greater distances than others. Therefore, a ruby laser is not necessarily stronger or more energetic than a neodymium laser, but the wavelengths produced have quite different properties.