Open AccessTerahertz generation by optical rectification in chalcopyrite crystals ZnGeP2, CdGeP2 and CdSiP2
Author(s) -
Herath P. Piyathilaka,
Rishmali Sooriyagoda,
Vikum Dewasurendra,
Matthew B. Johnson,
Kevin T. Zawilski,
Peter G. Schunemann,
Alan D. Bristow
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.016958
Subject(s) - optical rectification , terahertz radiation , optics , materials science , laser , excited state , wavelength , excitation , optoelectronics , nonlinear optics , physics , atomic physics , quantum mechanics
Optical rectification of near-infrared laser pulses generates broadband terahertz radiation in chalcopyrite crystals CdGeP 2 , ZnGeP 2 and CdSiP 2 . The emission is characterized using linear-polarized excitation from 0.8 eV to 1.55 eV (1550 nm - 800 nm). All three crystals are (110)-cut and polished to 0.5 mm, thinner than the coherence length across most of the excitation photon energy range, such that they all produce a bandwidth ~2.5 THz when excited with ~100 fs pulses. It is found that CdGeP 2 produced the strongest emission at telecoms wavelengths, while CdSiP 2 is generally the strongest source. Pump-intensity dependence provides the nonlinear coefficients for each crystal.