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Describe laser modes

Thoss, A., Five Photonics Trends for 2018, Laser Focus World, 12, Dec. 27, 2017. https://www.laserfocusworld.com/…/five-photonicstrends-for-2018.

With everyday items like nail polish, dental floss, paper clips, toothpicks and more, you can easily perform temporary DIY repairs to keep your eyewear functional until you can have them fixed professionally. Even better, some of these quick fixes can help save you some cash and bypass the need for professional repairs or replacement frames entirely. Here are our favorite DIY solutions to quickly mend your glasses using surprising household items or very cheap purchases.

Lasing modein optical

Pershin, S.M., Makarov, V.S., Grishin, M.Y. et al. New Lasing Mode of a Diode Laser: A 200-Picosecond Leading Edge of a Nanosecond Pulse. Bull. Lebedev Phys. Inst. 50 (Suppl 3), S383–S388 (2023). https://doi.org/10.3103/S1068335623150125

Sliney, D.H. and Wolbarsht, M., Safety with Lasers and Other Optical Sources: A Comprehensive Handbook, New York: Springer Science and Business Media, 2013.

A unique rangefinder that, as far as we know, was not mentioned in previous publications has been studied. It is based on an injection diode laser with an eye-safe radiation density (below 1 μJ/cm2) and a single-photon avalanche diode (SPAD). A new lasing mode of the nanosecond laser with a 200-ps-long step at the leading edge of a 4-ns-long pulse with spatial extension of about 1.2 m has been implemented. It has been found that the discovered step of the optical pulse amplitude is initiated by a current avalanche in a field-effect transistor (FET) that switches capacitance discharge in the feed circuit of the diode laser. The detection of the 200-ps-long amplitude step by a quick-response SPAD detector (20 ns) improves the accuracy of the rangefinder by 12 times. The application of such rang finder to measure critical distances (shorter than the laser pulse extension), e.g., in the problems of space ship landing or docking and underwater robot rendezvous and approach has been discussed.

A loose screw or broken frame can be panic-inducing when you rely on glasses to see properly or to shield your eyes from the summer sun. Luckily, first aid for your specs is close at hand.