Patent ID: 8284809

Claim:
A method, comprising: providing an optical path including means for separating light into a spectrum, directing a first range of wavelengths to a first detector and directing a second range of wavelengths to a second detector, wherein said first range of wavelengths comprises relatively short wavelengths compared to said second range of wavelengths, wherein said second range of wavelengths comprises relatively long wavelengths compared to said first range of wavelengths; splitting an input pulse of light into a first pulse and a second pulse; directing said first pulse of light onto said optical path, wherein if said first pulse of light comprises wavelengths within said first range, said first detector will produce a first signal, wherein, if said first pulse of light comprises wavelengths of light within said second range, said second detector will produce a second signal; and blocking said second pulse of light unless said first signal is produced by said first detector and said second signal is produced by said second detector.