In accordance with the invention, a mode-locked laser comprises an optical gain medium disposed within an optical cavity formed by a first reflector and a wavelength selective second reflector to achieve mode-locking operation. Advantageously, the wavelength reflective reflector is a two-dimensional subwavelength resonant grating. The resulting laser is compact, tunable, reliable and inexpensive. It provides high side mode suppression and high output power.

 
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