Chi-g Chen

Polarization line-by-line pulse shaping for the implementation of vectorial temporal Talbot effect

Vectorial optical arbitrary waveform generation is experimentally demonstrated by applying polarization line-by-line pulse shaping on a phase-modulated continuous laser frequency comb. Polarization shaped optical waveforms extending a 50-ps time window are successfully synthesized. Temporal Talbot effect is extended into the vectorial regime, where the distinct periodic temporal phases of the two orthogonally polarized pulse trains are exploited. In one example, we generate repetition-rate doubled circularly polarized pulses with alternating pulse-by-pulse handedness. In another example, complex instantaneous field polarizations are synthesized through the combination of line-by-line amplitude and temporal Talbot phase shaping. Our experimental results are measured through a dual-quadrature spectral interferometry system and are found in excellent agreements to the applied shaping controls.

Noniterative data inversion of phase retrieval by omega oscillating filtering for optical arbitrary waveform measurement.

We propose a noniterative data inversion process for the phase retrieval by omega oscillating filtering method that could measure both isolated attosecond pulses and periodic optical arbitrary waveform (OAW). The built-in phase modulation depth recovery not only prevents the need of independent calibration (a critical advantage in the extreme ultraviolet regime) but provides a self-consistency check for the data integrity. Our experiments successfully retrieved OAW with ~100% duty cycle in the near infrared regime.

All-optical self-referencing measurement of vectorial optical arbitrary waveform

We propose the Vectorial E-field Characterization Through all-Optical and self-Referenced (VECTOR) method to characterize vectorial optical arbitrary waveform with up to 100% duty cycle, which is free of ambiguity, iteration, radio-frequency or external optical reference, restriction on repetition rate, and requirement of external interferometric stabilization. The feasibility of VECTOR is experimentally verified by different waveforms created by a phase-modulated CW comb source and a built-in polarization line-by-line pulse shaper.

Self-referenced frequency comb measurement by using a polarization line-by-line pulse shaper

A polarization line-by-line pulse shaper is used for generation and noniterative spectral phase retrieval of optical arbitrary waveforms (OAWs) spanning over the entire repetition period. The method is completely reference-free, making it particularly attractive in measuring high repetition-rate OAW.

Synthesis and all-optical self-referenced measurement of vectorial optical arbitrary waveform

We demonstrated an integrated system that can manipulate and measure vectorial field spanning up to the entire repetition period without ambiguity, iteration, and reference.

Self-referenced frequency comb measurement by a polarization line-by-line pulse shaper

A polarization line-by-line pulse shaper is used in analytically measuring optical arbitrary waveforms (OAWs) of 100% duty cycle without reference, which is essential for high repetition rate OAWs.

Non-iterative data inversion of phase retrieval by omega oscillating filtering (PROOF)

We proposed a non-iterative data inversion process for the PROOF method that could measure attosecond extreme ultraviolet pulses. Our experiments successfully retrieved the spectral phases of near infrared comb.

Polarization spectral line-by-line pulse shaping

Spectral line-by-line pulse shaping is extended to full-vectorial capabilities for the first time to our best knowledge. We experimentally demonstrate polarization shaped optical waveforms extending a 50-ps time window.

Ultrafast temporal phase detection using thick nonlinear crystals

We experimentally demonstrated that second-harmonic generation yield due to a thick nonlinear crystal is sensitive to temporal phase of ultrashort pulses, which could be useful in temporal chirp monitoring and ultrafast coherent communications.