English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report a few-cycle, broadband, singly-resonant optical parametricoscillator (OPO) for the mid-infrared based on MgO-doped periodically-poledLiNbO3 (MgO:PPLN), synchronously pumped by a 20-fs Ti:sapphire laser. By usingcrystal interaction lengths as short as 250 um, and careful dispersionmanagement of input pump pulses and the OPO resonator, near-transform-limited,few-cycle idler pulses tunable across the mid-infrared have been generated,with as few as 3.7 optical cycles at 2682 nm. The OPO can be continuously tunedover 2179-3732 nm by cavity delay tuning, providing up to 33 mW of output powerat 3723 nm. The idler spectra exhibit stable broadband profiles with bandwidthsspaning over 422 nm (FWHM) recorded at 3732 nm. We investigate the effect ofcrystal length on spectral bandwidth and pulse duration at a fixed wavelength,confirming near-transform-limited idler pulses for all grating interactionlengths. By locking the repetition frequency of the pump laser to aradio-frequency reference, and without active stabilization of the OPO cavitylength, an idler power stability better than 1.6% rms over >2.75 hours isobtained when operating at maximum output power, in excellent spatial beamquality with TEM00 mode profile.

Few-cycle, Broadband, Mid-infrared Optical Parametric Oscillator Pumped by a 20-fs Ti:sapphire Laser