"Every once in a while, I have experienced the immense joy that comes with some entirely new insight or invention." —Theodor Hänsch, whose birthday we celebrate today. Above is his own illustrative depiction of his Nobel Prize-winning achievements—developing laser-based precision spectroscopy. Photo by Volker Steger. . . . . . . . . . #physics #science #radiation #lasers #spectrum #matter #light #wavelength #prism #rainbow #color #quantum #electron #electromagnetic #visible #wave #particle #nobel #laureate #photography #scientist #hbd #happybirthday #otd #onthisday