Passive harmonic mode-locking of discrete mode diode lasers

In their previous works (O´brien et. al, 2010), the authors applied a spectral filtering technique that enables the selection of a finite number of lasing modes in a Fabry-Perot (FP) cavity to the problem of passive mode-locking. This enabled the authors to fabricate mode-locked devices that generate both sinusoidal and pulsed intensity output. In this paper, this technique was illustrated by describing a device designed to support a discrete comb of six modes. This device incorporates 48 slotted regions etched into the ridge waveguide of the laser.