Fast reflective optic-based rotational anisotropy nonlinear harmonic generation spectrometer

Fast reflective optic-based rotational anisotropy nonlinear harmonic generation spectrometer

We present a novel Rotational Anisotropy Nonlinear Harmonic Generation (RA-NHG) apparatus based primarily upon reflective optics. The data acquisition scheme used here allow for fast accumulation of RA-NHG traces, mitigating low frequency noise from laser drift, while permitting real-time adjustment...

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Veröffentlicht in:Review of scientific instruments 2019-05, Vol.90 (5), p.053102-053102
Hauptverfasser: Lu, Baozhu, Tran, Jason D., Torchinsky, Darius H.
Format: Artikel
Sprache:eng
Schlagworte:
Anisotropy
Crystal structure
Data points
Electronic components
Rotational spectra
Scientific apparatus & instruments
Second harmonic generation
Wavelengths
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creator Lu, Baozhu
Tran, Jason D.
Torchinsky, Darius H.
description We present a novel Rotational Anisotropy Nonlinear Harmonic Generation (RA-NHG) apparatus based primarily upon reflective optics. The data acquisition scheme used here allow for fast accumulation of RA-NHG traces, mitigating low frequency noise from laser drift, while permitting real-time adjustment of acquired signals with significantly more data points per unit angle rotation of the optics than other RA-NHG setups. We discuss the design and construction of the optical and electronic components of the device and present example data taken on a GaAs test sample at a variety of wavelengths. The RA-second harmonic generation data for this sample show the expected four-fold rotational symmetry across a broad range of wavelengths, while those for RA-third harmonic generation exhibit evidence of cascaded nonlinear processes possible in acentric crystal structures.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Anisotropy
Crystal structure
Data points
Electronic components
Rotational spectra
Scientific apparatus & instruments
Second harmonic generation
Wavelengths
title Fast reflective optic-based rotational anisotropy nonlinear harmonic generation spectrometer
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