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Efficiency Measurement and Ytterbium in Lasers

Learn about calculating efficiency, Ytterbium in lasers, and minerals discovery in Ytterby, Sweden. Follow the agenda for upcoming quizzes and assignments.

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Efficiency Measurement and Ytterbium in Lasers

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  1. Warm up 4/29/13 • Question: What is the efficiency of a car that turns 13 J out of 100 J into useful motion? • Answer: • Eff = Wo / Wi • 13 J/100 J = 13% • Goal: I will measure efficiency.

  2. Element of the day • 70 – Ytterbium – Yb • Ytterbium (70), yttrium (39), terbium (67) and erbium (68) are all named after Ytterby, a town in Sweden where they were discovered in a mine. • Ytterbium is used in lasers. Lasers align light so that every single photon is the exact same wavelength in a completely coherent beam of light.

  3. Quiz Corrections • Lab 7C • Review Efficiency Problems • Tonight’s HW • Ch 8 Quiz Friday • Portal survey • Lab 7C (all) • Quiz Corrections Agenda / HW

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