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 allows for fast accumulation of RA-NHG traces, mitigating low frequency noise from laser drift, while permitting real-time adjustmen...

Full description

Saved in:
Bibliographic Details
Published inarXiv.org
Main Authors Lu, Baozhu, Tran, Jason D, Torchinsky, Darius H
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 31.10.2018
Subjects
Anisotropy
Crystal structure
Data points
Electronic components
Physics - Instrumentation and Detectors
Physics - Optics
Rotational spectra
Second harmonic generation
Wavelengths
Online AccessGet full text

Cover

More Information
Summary:We present a novel Rotational Anisotropy Nonlinear Harmonic Generation (RA-NHG) apparatus based primarily upon reflective optics. The data acquisition scheme used here allows 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1811.01862