Importance

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Abstract

A laser pump module has a ridge waveguide chip with a ridge width that is flared in the direction of the rear facet. Such a ridge profile yields a number of advantages depending on the specific implementation. The resulting increase in area of the rear facet, spreads heat, to improve device performance and avoid catastrophic optical mirror damage (COD). It can also lower the power density for the same output intensity. Further, it contributes to the single lateral mode property, acting as a mode filter. Higher order modes suffer higher losses and thus, tending to contribute to their attenuation--with less light fed back into the cavity from the rear facet, the laser device as a whole has reduced outside feedback sensitivity. Thus, in the implementation as a pump laser, less light at the signal wavelength returns to be amplified in a majority of the pump's ridge waveguide cavity. Still further, any back facet power monitor can be moved to improve its sensitivity level due to the large output and input area.

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First Claim