Abstract
Frequency doubling of a laser beam in a non-linear crystal has proven to be a very efficient way of accessing new wavelengths. Since it is a nonlinear effect, its efficiency can be improved by inserting the nonlinear medium in a resonant cavity. In this situation the ratio between the output frequency-doubled beam power and the pump power has been measured at values exceeding 80%. However, a single-mode optical cavity acts as a spatial filter, and can double efficiently TEM00 beams but not complex spatial patterns such as images. We present here an experiment where we have been able to frequency double low power c.w. images using a self-imaging cavity.
© 2009 IEEE
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