We should note that this latter type of shift was successfully amplified to a considerable extent by Russian physicists using the intense light of a ruby laser whose wavelength is close to that of a transition of the potassium atom.
Alfred KastlerRelated topics
atom close light note potassium should transition using laser wavelengthRelated quotes
If the stars should appear one night in a thousand years, how would men believe and adore and preserve for many generations the remembrance of the city of God which had been shown But every night come out these envoys of beauty, and light the universe with their admonishing smile.
Ralph Waldo Emerson