51.3 Why must we study physics Electromagnetic theory(1860), quantum theory (1900), stimulated emission theory (1917) are the foundations of laser. The maser was made in 1953. the first laser was made by Maiman in 1960 Totally reflecting Partly reflecting mirror Power supply 81.3 Why must we study physics Communication with optical fibers Erbium-Doped Fiber rbium- Doped Fiber 20m) Pump Diode 100 mW dt980 Long-Period Fiber Bragg Output Gratings for Gain Equalia 980/1550m mp Diode 120mW Fiber Bragg Grating for Gain-Lock Operation Isolator Fiber Bragg Grating for at 980 nm Gain-Lock Operatior14 §1.3 Why must we study physics Electromagnetic theory(1860), quantum theory(1900 ), stimulated emission theory(1917) are the foundations of laser. The maser was made in 1953, the first laser was made by Maiman in 1960 Communication with optical fibers §1.3 Why must we study physics