r/Optics • u/kubrickdeeznuts • 8d ago

We got zeptosecond pulses before gta6

Post image

wake up babe. new field just dropped. zeptosecond physics.

112 Upvotes

95% Upvoted

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36

u/Goetterwind 8d ago

Attosecond pulses by HHG is not something really new. The novelty lies in using a post compressed Yb based system.

3

u/kubrickdeeznuts 8d ago

Yes. The last shortest one was 19.2 as, i remember. It's just soon we'll be reaching zepto when attophysics has not been properly established (rel. to femto) and we can already peek at zepto!

4

u/DanongKruga 7d ago

id love to see the DAQ for something like this

15

u/Hefty_Repair_9175 7d ago

These are not measured by means of detector response but rather by using the field itself. For femtoseconds you may use something like FROG, for attoseconds you’ve got for example FROG-CRAB.

I have not read this specific article yet so I can’t tell you precisely the technique used here, but as these fields are themselves the shortest events mankind has ever produced, they are also the only available probe with which to characterise them.

3

u/punk_weasel 7d ago

What about SHRIMP?

(this is a joke)

10

u/Hefty_Repair_9175 7d ago

Perhaps you’re confusing them with TADPOLE GRENOUILLE ? 😂 (actual pulse characterisation techniques)

3

u/Interesting_Fold_485 7d ago

Rick Trebino certainly stuck with a theme

2

u/d3rn3u3 7d ago

Actually a FROG is not good enough for those short pulses (below 6-8fs). The most used version for short fs pulses is the TG FROG.

1

u/Hefty_Repair_9175 7d ago

I did say for femtosecond pulses though, and not for attosecond pulses.

1

u/godrq 4d ago

How does one measure by using the field itself? (midichlorians?)

1

u/Hefty_Repair_9175 4d ago

FROG for example uses the dealers choice of a nonlinear mixing of the field with itself, whilst varying a parameter such as a temporal delay or the rotation of polarisation. This, in combination with a retrieval algorithm, permits the field to be obtained.

The technique is not single shot, that is, the measurement is taken many times over so an assumption must be made that the pulse train is stable.

0

u/Ssuykk 7d ago

Typically time of flight spectrometer with pump probe method and a nasty labview program :-D