Patent ID: 7079249

Claim:
A measurement system for evaluating a sample comprising: a first diode laser generating an intensity modulated pump laser beam; a second diode laser generating a probe laser beam; a combiner, with the output of said first diode laser being coupled to said combiner by mounting said first diode laser directly to the combiner and with the output of said second diode laser being coupled to said combiner by mounting said second diode laser directly to the combiner; a fiber operatively connected to said combiner, said combiner being arranged to combine the pump and probe laser beams and focus the combined laser beams into said fiber; an objective lens positioned to focus the combined laser beams exiting the fiber onto the surface of the sample, with the pump laser beam periodically exciting a region of the sample surface, the objective lens also gathering a portion of the combined laser beams that are reflected from the periodically excited region; a detector for monitoring the reflected portion of the probe laser beam and generating output signals corresponding thereto; a filter for filtering the output signals; and a processor for evaluating the sample based on the filtered output signals.