Nanosecond Pulse Generation Using the Stimulated Brillouin Scattering Effect in a Photonic Crystal Fiber

A nanosecond pulsed laser is demonstrated using the stimulated Brillouin scattering (SBS) effect in a nonlinear photonic crystal fiber (PCF). The Brillouin fiber laser (BFL) uses a 50-m-long PCF in a simple ring cavity to generate a self-starting pulse as the Brillouin power reaches 16.5 dBm based on the relaxation oscillation technique. The BFL generates a pulse train with repetition rates of 2.7 MHz and 5.4 MHz depending on the BP power. The pulse width of the laser is obtained to be 190 ns at the BP power of 16.5 dBm and is maintained at around 72 ns as the pump power is set within 17.7 dBm and 18.5 dBm. The maximum pulse energy of 20 nJ is obtained at BP power of 17.4 dBm. This SBS based pulse laser is fairly stable at room temperature.