Laser (cekakan saka basa Inggris: Light Amplification by Stimulated Emission of Radiation) iku siji piranti sing migunakaké èfèk mekanika kuantum, pancaran kastimulasi, kanggo ngasilaké siji cahya sing kohèrens saka medium "lasing" sing dikontrol kamurnian, ukuran, lan wanguné. Sinar laser bisa sambung-sinambung lan kanthi amplituda-konstan (dikenal minangka CW utawa gelombang berkelanjutan), utawa detak, kanthi migunakaké tèknik Q-switching, modelocking, utawa gain-switching.

Jrpning operasi detak, akèh daya puncak sing luwih dhuwur bisa digayuh. Sawijining medium laser uga bisa duwé fungsi minangka amplifier optikal nalika di-seed nganggo cahya saka sumber liya. Signal sing dikuataké bisa mèmper banget karo signal input sajeroning istilah panjang gelombang, fase, lan polarisasi; Bab iki wigati sajeroning komunikasi optikal. Tembung kriya "lase" tegesé mroduksi cahya kohèrens, lan asalé saka tembung laser iki.

Uga delengen 
 active laser medium
 laser applications
 laser construction
 laser science
 list of laser types
 ring laser gyroscope
 maser
 Laser Induced Breakdown Spectroscopy (LIBS)
 Laser pointer

Pranala njaba 
 Sam's Laser FAQ by Samuel M. Goldwasser
 Encyclopedia of laser physics and technology by Rüdiger Paschotta
 Liquid Light  by Phil Schewe, James Riordon, and Ben Stein
 Light turns into glowing liquid by Eugenie Samuel
 Experiments Detail How Powerful Ultrashort Laser Pulses Propagate through Air 
 Filamentation and Propagation of Ultra-Short, Intense Laser Pulses in Air 
 Lasing Activity without Population Inversion  by Phillip F. Schewe and Ben Stein
 Lasing without Inversion  by Phillip F. Schewe and Ben Stein

Laser
Optik
Mekanika kuantum