Lasers As Fast As Possible
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From epic space battles to the checkout counter at your local big-box store, lasers are everywhere... Thanks to Braintree for supporting our channel. To learn more, and for your first $50,000 in transactions fee-free, go to braintreepayments.com Follow: twitter.com Join the community: linustechtips.com
Lasers are all around us, from grocery store checkouts to high tech science, and the video explains how they work in clear, approachable terms. It starts by outlining the historical arc from Einstein's theoretical foundation in 1917 to the first practical laser in 1960, then quickly transitions to how lasers actually generate light. The key mechanism is the gain medium, where light excites electrons which emit photons that become a coherent beam through feedback between mirrors and a semi transparent output coupler. The video emphasizes why lasers are powerful and narrow: coherence of photons and amplification through repeated stimulation. Different gain media produce different wavelengths, explain why some colors are cheaper, and connect these principles to real-world uses like fiber optics, barcode scanners, and even potential weaponry, while noting the ongoing challenges in weaponizing lasers due to power, size, and overheating. The closing segments touch on modern applications and the practicality of integrating laser-based technologies into everyday devices and services, including a plug for a sponsor and a nod to related LinusTechTips content. Overall, the video balances foundational physics with accessible examples to show how lasers shape both science and everyday life.
Topics · science & technology · education · technology · physics
Questions answered
- What is a laser and how does it differ from ordinary light?
- A laser is a device that amplifies light through stimulated emission in a gain medium, producing photons that are in phase and travel in the same direction, resulting in a highly coherent, narrow beam.
- Why can different lasers emit different colors, and why are some colors cheaper?
- Different gain media require different energies to excite electrons, so they emit photons at different wavelengths; red lasers are typically cheaper because the materials and energy requirements for red emission are easier and less costly.