We present a theoretical, numerical and experimental assessment of the impact of speckle on a dual electro-optic frequency comb (EOFC) based system for integrated path differential absorption (IPDA) measurements. The principle of gas concentration measurements in a dual EOFC configuration in the absence of speckle is first briefly reviewed and experimentally illustrated using a CH gas cell. A numerical simulation of the system performance in the presence of speckle is then outlined. The speckle-related error in the concentration estimate is found to be an increasing function of the product between the roughness of the backscattering surface and the EOFC line-spacing. As this product increases, the speckle-induced power fluctuations in the comb lines are no longer correlated to each other. To confirm this, concentration measurements are conducted using backscattered light from two different surfaces. Experiment results are in very good agreement with numerical simulations. Though detrimental for IPDA measurements, it is finally shown that decorrelation of speckle noise can be advantageously exploited for surface characterization in a dual EOFC configuration.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.457064 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
On-Chip Photonic Simulating Band Structures toward Arbitrary-Range Coupled Frequency Lattices.
Phys Rev Lett
December 2024
CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, 230026, China.
Photonic simulators are increasingly used to study physical systems for their affluent manipulable degrees of freedom. The advent of photonic chips offers a promising path towards compact and configurable simulators. Thin-film lithium niobate chips are particularly well suited for this purpose due to the high electro-optic coefficient, which allows for the creation of lattices in the frequency domain.
View Article and Find Full Text PDFPlasmonic electro-optic modulators on lead zirconate titanate platform.
Nanophotonics
August 2024
Center for Nano Optics, University of Southern Denmark, Odense, Denmark.
The advancement in material platforms exhibiting strong and robust electro-optic effects is crucial for further progress in developing highly efficient and miniaturized optoelectronic components with low power consumption for modern optical communication systems. In this work, we investigate thin-film lead zirconate titanate (PZT) substrates grown by a chemical solution deposition technique as a potential platform for on-chip plasmonic electro-optic modulators. A high modulation depth (>40 %) is achieved with 15 μm-long electro-optic directional coupler modulators.
View Article and Find Full Text PDFA thin film lithium niobate near-infrared platform for multiplexing quantum nodes.
Nat Commun
December 2024
John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
Practical quantum networks will require multi-qubit quantum nodes. This in turn will increase the complexity of the photonic circuits needed to control each qubit and require strategies to multiplex memories. Integrated photonics operating at visible to near-infrared (VNIR) wavelength range can provide solutions to these needs.
View Article and Find Full Text PDFSecond-harmonic generation (SHG) plays a significant role in modern photonic technology. Integrated photonic resonators fabricated with thin-film lithium niobate can achieve ultrahigh efficiencies by combining small mode volumes with high material nonlinearity. Cavity-enhanced SHG requires accurate phase and frequency matching conditions, where fundamental and second-harmonic wavelengths are both on resonance.
View Article and Find Full Text PDFArticle Synopsis
- Heterodyne phase-sensitive dispersion spectroscopy (HPSDS) is a non-intrusive gas sensing method that relies on measuring the refractive index near gas absorption transitions, making it less affected by laser intensity fluctuations.
- Traditional HPSDS sensors require calibration with standard gas mixtures, which can be difficult and unreliable, particularly with varying gas compositions; this study introduces a new approach that allows for fully calibration-free measurements.
- The researchers developed a novel analytical model for HPSDS that integrates various modulation techniques and tested it successfully with gases like CH, NO, and NH, demonstrating its effectiveness across different laser types and conditions.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!