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						<h1 itemprop="headline">QUSCOPE seminar - Yann Le Coq: Transfer of spectral purity from the optics to the microwave, THz and Optics domains using an optical frequency comb</h1>
						
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														Tirsdag  5. april 2016,
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														&nbsp;kl. 15:15 -  16:00
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														<p>1525-323</p>
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														Klaus Mølmer
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														<span itemprop="name">Grete Flarup</span>
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									<p>QUSCOPE seminar
</p>
<p>&nbsp;</p>
<p><strong>Speaker</strong>: Yann Le Coq,&nbsp; LNE-SYRTE, Observatoire de Paris, France 
</p>
<p><strong>Title</strong>: Transfer of spectral purity from the optics to the microwave, THz and Optics domains using an optical frequency comb
</p>
<p><strong>Time</strong>: Tuesday 5. April 15:15-16:00
</p>
<p><strong>Place</strong>:1525-323
</p>
<p><strong>Abstract</strong>:
</p>
<p>Optical frequency combs are used routinely in national metrology institutes and elsewhere for measuring and comparing optical frequency standards (optical clocks). Beyond this "traditional" use, they can also be utilized to transfer the spectral purity of a state-of-the-art optical source to other frequency domains, thereby generating an ultra-low phase noise source in this other frequency domain. I will describe our experiments that do so, targeting the microwave (~10 GHz), teraHertz (~30 THz) and optics (~200 THz) domains. I will describe several techniques that are used to ensure the comb adds a negligible extra noise in the frequency conversion and show how these techniques allow to create, both in the microwave and Teraherz domains, spectrally ultra-pure sources with record low phase noise levels, several orders of magnitude below more traditionnal technologies.
</p>
<p>There will be tea and coffee from 15:00.
</p>
<p>&nbsp;</p>
								
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