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Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 09 May 2024 18:26:11 +0000 From: Joe Gwinn <joegwinn@comcast.net> Newsgroups: sci.electronics.design Subject: Re: OT: Atomic nucleus excited with laser: a breakthrough after decades Date: Thu, 09 May 2024 14:26:12 -0400 Message-ID: <i65q3jh8v0fmtvr78k1rb4f7c1jnu5iqjm@4ax.com> References: <v1ccs5$3vg2$1@solani.org> <v1damh$39abm$1@dont-email.me> <v1ddj1$3a290$1@dont-email.me> <iokk3jt0njsobhf2v21i4b33cl28ee8706@4ax.com> <ljel3jdeon58rbh2vv60ae6v12qndhvj4i@4ax.com> <v1fdt2$3s1bh$1@dont-email.me> <v1fp1t$3uilh$1@dont-email.me> <v1g36m$vif$1@dont-email.me> <b3tn3j120qqt3g1b8k9dnq59iuca9kbvvu@4ax.com> <v1h27n$85q5$1@dont-email.me> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Lines: 35 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-vKK4v7RMa2F41HDw1FlO0EMlmyhtA3OaZem475+CE3hcrY8iYDx+ZdYxH1tGP5ZQQjNAK3gNfqD4hxF!fsyG2r7xZMWrNH/p04rf4EGYPq3TCwVZp7s04evOaUjlOD71oRScT0LVCKlVODLRg2EFRRY= X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2673 On Wed, 8 May 2024 23:35:19 -0000 (UTC), Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote: >Joe Gwinn <joegwinn@comcast.net> wrote: >> On Wed, 8 May 2024 14:45:42 -0000 (UTC), Phil Hobbs >> <pcdhSpamMeSenseless@electrooptical.net> wrote: >> >> [snip] >> >>> The cleverest part of the Hall-Haensch comb generator is that you can lock >>> the blue end of the comb to the second harmonic of the red end, one tooth >>> off, and lock the difference to a good reference. Then all the teeth have >>> the same phase noise as the reference oscillator, rather than 20 log(600 >>> THz / 100 MHz) ~ 138 dB worse, as it would be in a multiplier. >> >> Hmm. It had to be true, but I never connected the dots there. What >> is mechanism by which this is achieved? References? >> >> Thanks, >> >> Joe Gwinn >> > >Don’t have the reference handy, but the basic idea is to use a modelocked >system Ti:sapphire laser at 750 nm to generate ~100-fs pulses, then use >fiber/grating pulse compression to bring that down to a few femtoseconds, >followed by a holey fiber to broaden the spectrum to more than an octave. > >Jan Hall is one of the best instruments guys ever. I'll poke around his publications. He's bound to have left tracks. Thanks, Joe Gwinn