Simultaneous measurement of two different-color ultrashort pulses on a single shot

Abstract

We experimentally demonstrate the ability of double blind frequency-resolved optical gating to simultaneously measure two independent pulses at very different wavelengths on a single shot. Our device uses polarization-gate geometry, allowing pulses at any two wavelengths and unlimited operating bandwidth. The retrieval algorithm is robust and is capable of ignoring most forms of noise in the measured spectrograms.

Recent Developments in Experimental Techniques for Measuring Two Pulses Simultaneously

“…Recently, another two-pulse measurement technique, a variation of the original Blind FROG, was demonstrated and is called Double Blind FROG (DB FROG) [25,26]. Note the lack of a hyphen between "Double" and "Blind" in its name to avoid confusion with the medical-experiment technique in which neither the experimenter nor the patient has knowledge of the sample in question.…”

“…The spectral peak locations match very well between the DB PG FROG and spectrometer measurements, confirming that the retrieved pulses are indeed correct. (f) and (h), the measured spectrum and the spectral phase compared with measurement made by a spectrometer [26].…”

“…Figure 12. The schematic of single-shot DB PG FROG for measuring an unknown pulse pair at different wavelengths (400 nm and 800 nm in the actual experimental demonstration) [26]. Figure 13.…”

“…(e) and (g), retrieved pulse intensity and phase in temporal domain. (f) and (h), the measured spectrum and the spectral phase compared with a measurement made by a spectrometer [26].…”

“…Over the years, researchers have proposed different techniques to accomplish this two-pulse measurement task in a single device, such as Blind-FROG [18][19][20], complete reconstruction of attosecond bursts (CRAB) [21,22] very advanced method for phase and intensity retrieval of e-fields (VAMPIRE) [23,24] and Double Blind FROG [25,26]. Several articles have reviewed the commonly used single-pulse measurement techniques [27][28][29][30], so we will focus on the two-pulse measurement problem and review the aforementioned techniques.…”