A Volume Bragg Grating (VBG) laser diode is a type of laser diode that uses Bragg grating to achieve high spectral purity and wavelength stabilization. Volume Bragg Grating is a transparent medium that exhibits a periodic variation in its refractive index and provides narrow linewidth for laser diodes. It is used for pumping some solid-state lasers in which the laser crystal exhibits efficien...read more

Gain switching is a method to generate short optical pulses in the order of picoseconds (10-12) in a laser by modulating the pump power or laser gain. An electrical or optical pumping can be provided for gain-switching. In this method, the optical cavity gain changes rapidly from a low value to a high value. When a high pump power is given, it takes time for the laser emission to happen since...read more