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Compact background-free balanced cross-correlators

  • US 7,940,390 B2
  • Filed: 11/29/2007
  • Issued: 05/10/2011
  • Est. Priority Date: 11/30/2006
  • Status: Active Grant
First Claim
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1. A method for precise detection of the timing error between laser pulses, the method comprising:

  • directing first and second input pulses through a nonlinear medium and a group dispersion/delay element, generating a first-pass sum-frequency component from the first and second input pulses and changing the relative positions of the first and second input pulses;

    directing the first-pass sum-frequency component and the first and second input pulses to an inline dichroic mirror that passes the sum-frequency component and reflects the first and second input pulses;

    detecting the energy of the sum-frequency component that passed through the inline dichroic mirror;

    directing the reflected first and second input pulses back through the group dispersion/delay element and nonlinear medium, changing the relative positions of the first and second input pulses and generating a second-pass sum-frequency component from the reflected first and second input pulses;

    detecting the energy of the second-pass sum-frequency component; and

    comparing the energy of the first-pass sum-frequency component with the energy of the second-pass sum-frequency component to determine the relative positions of the first and second input pulses.

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