An international team of scientists report that they have successfully used acoustics to deflect laser beams in an engineering first.

Laser Beams Deflected Off of Nothing but Air for First Time Ever in Breakthrough Patent Pending Process - The Debrief::An international team of scientists report that they have successfully used acoustics to deflect laser beams in an engineering first.

  • Kazumara@feddit.deEnglish
    40·
    1 year ago

    Just a small note, it’s written dB, small “d”, big “B”.

    “B” is the unit symbol for bel and “d” is the symbol for the SI prefix deci, a tenth.

      • Kazumara@feddit.deEnglish
        3·
        1 year ago

        Oh yes, sure you can, 140 dB is 0.000014 MB. The confusing thing is just that the non-SI unit byte also uses the symbol “B” and uses the SI prefix “M” quite often.

        Sometimes when I calculate optical power levels I actually use B in between. For example:

        How much signal is 88 optical channels at 1.6 dBm of power each?

        0 dBm = 1 mW by definition

        1.6 dB = 0.16 B = log10 ( x ) --> x = 10 ^ 0.16 = 1.45

        So 1.6 dBm is 1.45 * 1 mW = 1.45 mW

        Then 88 channels is 88 * 1.45 mW = 127.60 mW = 127.60 * 1 mW

        log10(127.60) = 2.11 B = 21.1 dB

        So 127.20 mW is 21.1 dBm, just below the output specification of our amplifier, good, nothing should melt.