a scanning microscope having a laser outputting an excitation laser beam and a fiber member having a first core and a second core . the second core is generally disposed within the first core and is operable to receive the excitation laser beam from the laser and transmit the excitation laser beam to a sample to be tested . a moveable stage supports an end of the fiber member and / or a sample to be tested and is operable to move the end of the fiber member and the sample to be tested relative to each other .