Patent ID: 8379215
Filing Date: 2013-02-19
Classification: G01J

Abstract:
1. A method for determining amplitude and phase versus frequency of an incoming beam of pulsed laser light, comprising the steps of: setting an apparatus to an initial configuration; splitting the incoming beam into two beams of substantially equal intensity; delaying one of the two split beams for a delay period t; recombining the two split beams to form a recombined beam; shining the recombined beam onto a thick SHG crystal at rotation angle θ; detecting light emitted from the thick SHG crystal as data; storing the data with reference to the delay period t and the angle θ; rotating the thick SHG crystal by an angle δθ; repeating the steps of splitting, delaying, recombining, shining, detecting, storing, and rotating until the thick SHG crystal has completed 360° of rotation; increasing the delay period t by δt; repeating the steps of splitting, delaying, recombining, shining, detecting, storing, rotating, repeating and increasing until a selected beam delay period range has been completed; and processing the stored data to determine amplitude and phase versus frequency of the incoming beam of pulsed laser light.