Experimental study of the effect of phase mismatch on a CW-pumped cascaded quadratic nonlinear frequency comb

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Ulvila , V & Vainio , M 2020 , ' Experimental study of the effect of phase mismatch on a CW-pumped cascaded quadratic nonlinear frequency comb ' , JPhys photonics , vol. 2 , no. 3 , 034006 . https://doi.org/10.1088/2515-7647/ab9150

Title: Experimental study of the effect of phase mismatch on a CW-pumped cascaded quadratic nonlinear frequency comb
Author: Ulvila, Ville; Vainio, Markku
Contributor: University of Helsinki, Department of Chemistry
Date: 2020-07
Language: eng
Number of pages: 12
Belongs to series: JPhys photonics
ISSN: 2515-7647
URI: http://hdl.handle.net/10138/324816
Abstract: Optical frequency comb generation by continuous-wave-pumped cascaded quadratic nonlinearities (CQN) appears a promising alternative to well-established modelocked lasers, especially if access to the mid-infrared spectral region is needed. We report an experimental investigation of spectral properties of a CQN frequency comb, which is based on second-harmonic generation (SHG) and is pumped internally by a continuous-wave optical parametric oscillator. Our study focuses on SHG phase mismatch, which has drawn little attention in the previously reported CQN frequency comb research. The main observation of our study is that it is possible to improve spectral purity of the CQN frequency comb by adjusting the phase mismatch. In addition to the CQN process that generates a frequency comb in the near-infrared region, our experimental setup involves several other nonlinear processes. These processes lead to a composite comb, which extends from visible to mid-infrared.
Subject: optical frequency comb
infrared frequency comb
cascaded quadratic nonlinearity
nonlinear optics
OPTICAL PARAMETRIC OSCILLATOR
MODE-LOCKING
GENERATION
PULSES
114 Physical sciences
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