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Jung, Kwangyun,Shin, Junho,Kang, Jinho,Hunziker, Stephan,Min, Chang-Ki,Kim, Jungwon Optical Society of America 2014 Optics letters Vol.39 No.6
<P>We demonstrate a remote microwave/radio frequency (RF) transfer technique based on the stabilization of a fiber link using a fiber-loop optical-microwave phase detector (FLOM-PD). This method compensates for the excess phase fluctuations introduced in fiber transfer by direct phase comparison between the optical pulse train reflected from the remote site and the local microwave/RF signal using the FLOM-PD. This enables sub-fs resolution and long-term stable link stabilization while having a wide timing detection range and less of a demand in fiber dispersion compensation. The demonstrated fractional frequency instability between 2.856 GHz RF oscillators separated by a 2.3 km fiber link is 7.610(-18) and 6.510(-19) at 1000 and 82,500 s averaging times, respectively.</P>
Kwon, O-Pil,Kwon, Seong-Ji,Jazbinsek, Mojca,Brunner, Fabian D. J.,Seo, Jung-In,Hunziker, Christoph,Schneider, Arno,Yun, Hoseop,Lee, Yoon-Sup,Gü,nter, Peter WILEY-VCH Verlag 2008 Advanced functional materials Vol.18 No.20
<P>We investigate a configurationally locked polyene (CLP) crystal 2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile (OH1) containing a phenolic electron donor, which also acts as a hydrogen bond donor. The OH1 crystals with orthorhombic space group Pna2<SUB>1</SUB> (point group mm2) exhibit large second-order nonlinear optical figures of merit, high thermal stability and very favorable crystal growth characteristics. Higher solubility in methanol and a larger temperature difference between the melting temperature and the decomposition temperature of OH1 compared to analogous CLP crystals, are of advantage for solution and melt crystal growth, respectively. Acentric bulk OH1 crystals of large sizes with side lengths of up to 1 cm with excellent optical quality have been successfully grown from methanol solution. The microscopic and macroscopic nonlinearities of the OH1 crystals are investigated theoretically and experimentally. The OH1 crystals exhibit a large macroscopic nonlinearity with four times larger powder second harmonic generation efficiency than that of analogous CLP crystals containing dimethylamino electron donor. A very high potential of OH1 crystals for broadband THz wave emitters in the full frequency range of 0.1–3 THz by optical rectification of 160 fs pulses has been demonstrated.</P> <B>Graphic Abstract</B> <P>Configurationally locked polyene OH1 crystals containing a phenolic electron donor exhibit large second-order nonlinear optical figures of merit, high thermal stability, and very favorable crystal-growth characteristics. A very high potential of OH1 crystals for broadband THz wave emitters in the full frequency range of 0.1–3 THz by optical rectification of 160 fs pulses has been demonstrated. <img src='wiley_img/1616301X-2008-18-20-ADFM200800633-content.gif' alt='wiley_img/1616301X-2008-18-20-ADFM200800633-content'> </P>