In a previous publication we described measurements which demonstrated that a defocusing nonlinear lens was present in an unpumped VECSEL gain sample, and that the inverse focal length of the lens increased with pump power, to the point of becoming a focusing lens for sufficiently high pump powers. Unfortunately, by necessity this measurement was performed using a probe laser which was not resonant with the quantum wells in the sample, meaning that the values measured may well be different from those experienced under operating conditions in a VECSEL. This paper describes a more complete characterisation of VECSEL gain sample nonlinear lensing with a probe laser whose wavelength is resonant with the gain sample quantum wells.
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