We have experimentally demonstrated a simplified method for performing single-shot supercontinuum spectral interferometry (SSSI) that does not require pre-characterization of the probe pulse. The method, originally proposed by D. T. Vu, D. Jang, and K. Y. Kim, uses a genetic algorithm (GA) and as few as two time-delayed pump-probe shots to retrieve the pump-induced phase shift on the probe [Opt. Express26,20572(2018)]. We show that the GA is able to successfully retrieve the transient modulations on the probe, and that the error in the retrieved modulation decreases dramatically with the number of shots used. In addition, we propose and demonstrate a practical method that allows SSSI to be done with a single pump-probe shot (again, without the need for pre-characterization of the probe). This simplified method can prove to be immensely useful when performing SSSI with a low-repetition-rate laser source.
The authors present an erratum to update the Acknowledgements section in their published article, [“Fabrication and characterization of a two-dimensional individually addressable electrowetting microlens array,”Opt. Express31,30550(2023)10.1364/OE.497992].
We report an advanced Fourier transform spectrometer (FTS) on silicon with significant improvement compared with our previous demonstration in [Nat. Commun.9,665(2018)2041-1723]. We retrieve a broadband spectrum (7 THz around 193 THz) with 0.11 THz or sub nm resolution, more than 3 times higher than previously demonstrated [Nat. Commun.9,665(2018)2041-1723]. Moreover, it effectively solves the issue of fabrication variation in waveguide width, which is a common issue in silicon photonics. The structure is a balanced Mach–Zehnder interferometer with 10 cm long serpentine waveguides. Quasi-continuous optical path difference between the two arms is induced by changing the effective index of one arm using an integrated heater. The serpentine arms utilize wide multi-mode waveguides at the straight sections to reduce propagation loss and narrow single-mode waveguides at the bending sections to keep the footprint compact and avoid modal crosstalk. The reduction of propagation loss leads to higher spectral efficiency, larger dynamic range, and better signal-to-noise ratio. Also, for the first time to our knowledge, we perform a thorough systematic analysis on how the fabrication variation on the waveguide widths can affect its performance. Additionally, we demonstrate that using wide waveguides efficiently leads to a fabrication-tolerant device. This work could further pave the way towards a mature silicon-based FTS operating with both broad bandwidth (over 60 nm) and high resolution suitable for integration with various mobile platforms.
We proposed the use of relative encircled power as a measure of focusing efficiency [Optica7,252(2020)OPTIC82334-253610.1364/OPTICA.388697]. The comment [Optica8,1009(2021)OPTIC82334-253610.1364/OPTICA.416017] has raised useful questions, which we address briefly here and provide some clarifications.
Three (3) items of errata are submitted for our recently published paper [Opt. Express28,36505(2020)10.1364/OE.405566]. One is a clarifying extension to the Fig. 3 caption. Two are typographical corrections. The scientific results and conclusions are unaffected.
Park, Bo_Kyung; Han, Sang_M; Han, Sang_Eon(
, Optical Materials Express)
Two typographical corrections are made for our recently published paper [Opt. Mater. Express12(7),2529(2022)10.1364/OME.462592]. The results, discussion, and conclusion of the paper are unaffected.
Patel, Dhruvit, Jang, Dogeun, Hancock, Scott_W, Milchberg, Howard_M, and Kim, Ki-Yong.
"Simplified single-shot supercontinuum spectral interferometry". Optics Express 28 (8). Country unknown/Code not available: Optical Society of America. https://doi.org/10.1364/OE.386631.https://par.nsf.gov/biblio/10142448.
@article{osti_10142448,
place = {Country unknown/Code not available},
title = {Simplified single-shot supercontinuum spectral interferometry},
url = {https://par.nsf.gov/biblio/10142448},
DOI = {10.1364/OE.386631},
abstractNote = {We have experimentally demonstrated a simplified method for performing single-shot supercontinuum spectral interferometry (SSSI) that does not require pre-characterization of the probe pulse. The method, originally proposed by D. T. Vu, D. Jang, and K. Y. Kim, uses a genetic algorithm (GA) and as few as two time-delayed pump-probe shots to retrieve the pump-induced phase shift on the probe [Opt. Express26,20572(2018)]. We show that the GA is able to successfully retrieve the transient modulations on the probe, and that the error in the retrieved modulation decreases dramatically with the number of shots used. In addition, we propose and demonstrate a practical method that allows SSSI to be done with a single pump-probe shot (again, without the need for pre-characterization of the probe). This simplified method can prove to be immensely useful when performing SSSI with a low-repetition-rate laser source.},
journal = {Optics Express},
volume = {28},
number = {8},
publisher = {Optical Society of America},
author = {Patel, Dhruvit and Jang, Dogeun and Hancock, Scott_W and Milchberg, Howard_M and Kim, Ki-Yong},
}
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