Patent ID: 7679743

Claim:
An apparatus for measuring a deflected probe beam signal generated by laser-induced breakdown, comprising: a pulse laser for causing a pulse laser beam to be incident into a sample cell, which contains a nanoparticle, along a Z-axis direction; a laser-induced breakdown lens arranged on a path along which the pulse laser beam travels in the Z-axis direction, and configured to cause the pulse laser beam to be focused on an internal location of the sample cell; a probe beam laser for causing a probe beam to be incident on the sample cell in a Y-axis direction perpendicular to a travel path of the pulse laser beam so that the probe beam passes through a location perpendicularly spaced apart in an X-axis direction from a focus of the pulse laser beam by a predetermined distance; a first iris diaphragm installed upstream of the pulse laser to adjust a diameter of the pulse laser beam; a first linear polarizing plate, a second linear polarizing plate and a beam splitter, sequentially installed downstream of the first iris diaphragm, wherein the first linear polarizing plate is installed to be rotatable and the second linear polarizing plate is installed to fix a direction thereof so as to allow only a polarized laser beam traveling in the X-axis direction to pass therethrough; an energy meter installed to measure energy of a pulse laser beam reflected from the beam splitter; a notch filter for blocking a light scattering signal corresponding to a wavelength of the pulse laser beam included in signals of the probe beam having passed through the sample cell; a photodiode for detecting a probe beam signal having passed through the notch filter; a gate integrator for receiving the probe beam signal detected by the photodiode; and a computer for storing data output from the gate integrator.