Protecting a power-laser diode from retroreflections by means of a fiber /spl lambda//4 retarder

Fabrication of a Wedge-shaped Fiber Endface by a Self-centering Technique

“…As it is well known, even small reflections can severely distort and shift the laser emission spectrum and increase power fluctuations [1,2]. In a pump laser, this reduces the pump efficiency, and can ultimately lead to the source failure because of excessive power in the cavity [2].…”

“…As the performances of the fiber-to-chip plain butt-coupling are unsatisfactory, a number of solutions have been developed, either using microoptics elements or fiber-endface shaping [1][2][3] into lenses or wedges.…”