Scientific American magazine says huge lasers turn only about twenty to thirty percent of the energy they use into a laser beam.

VOA: special.2010.09.01

A special needle is inserted directly into the tumor and light energy is passed through a laser.

VOA: special.2010.11.23

Doctors Charles Campbell and Charles Koester used a laser to remove a tumor from a patient's eye at Columbia-Presbyterian Hospital in New York City.

VOA: special.2010.09.01

(Speaking) With LASIK,doctors use a laser to permanently change the shape of the cornea to improve vision.

VOA: standard.2010.03.03

When a Marine gets hit by a laser beam, his weapon gets de-activated.

VOA: standard.2010.04.06

Lang lives in the San Francisco bay area. He is a laser physicist and graduate of the California Institute of Technology, and has nearly 50 U.S.patents to his name.

VOA: standard.2010.03.17

Before the laser, scientists developed a similar device: a maser which stands for Microwave Amplification by Stimulated Emission of Radiation.

VOA: special.2010.09.01

Laser disc players use lasers to accurately read or write marks on a reflective,coated plastic disc.

VOA: special.2010.09.01

In Theodore Maiman's first laser, a rod of man-made ruby supplied the electrons.

VOA: special.2010.09.01

Their guns are equipped with a special device that emits laser beams each time a Marine pulls a trigger.

VOA: standard.2010.04.06

An Australian company, Electro Optic Systems, has received a $3.5 million government grant to develop the world's first automated, high-precision, laser tracking technology.

VOA: standard.2010.07.24

Its ultimate aim is to build a series of laser tracking stations in various countries to provide a defensive shield for activity in space.

VOA: standard.2010.07.24