Light waveform measuring device including a streak camera

A light waveform measuring device which measures a waveform of light produced from an object in response to an exciting pulse beam, comprising:

• light source means for outputting first and second light beams which are different in frequency and at least one of which is a pulse beam;
• mixing means for subjecting said first and second light beams to sum frequency mixing;
• selecting means for selecting a sum frequency beam from output beams of said mixing means, and applying said sum frequency beam to said object as said exciting pulse beam;
• pulse detecting means for detecting a pulse beam which is synchronous with said sum frequency beam from said output beams of said mixing means and producing an output when such a pulse beam is detected;
• and
• measuring means for detecting and measuring said waveform of light produced from said object in response to said exciting pulse beam using said output of said pulse detecting means as a measurement starting reference signal.