Lasers, developed during the mid-20th century, deliver coherent light in a tightly focused beam.
Depending on application, lasers can be as small as a strand of DNA or as large as a sports stadium. They can generate power from a few picowatts to more than 500 trillion watts. Their applications range from high-speed communications and digital technologies to medical advances and precision manufacturing. (Photo: TOPTICA Photonics AG)
(Courtesy of TOPTICA Photonics AG)