This time we are looking on the crossword puzzle clue for: Such surgery scares a lot — not all coming back.
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Last seen on: The Guardian – Cryptic Crossword No 28,244 – Sep 21 2020
Random information on the term “LASER”:
An output coupler (OC) is the component of an optical resonator that allows the extraction of a portion of the light from the laser’s intracavity beam. An output coupler most often consists of a partially reflective mirror, allowing a certain portion of the intracavity beam to transmit through. Other methods include the use of almost-totally reflective mirrors at each end of the cavity, emitting the beam either by focusing it into a small hole drilled in the center of one mirror, or by redirecting through the use of rotating mirrors, prisms, or other optical devices, causing the beam to bypass one of the end mirrors at a given time.
In its most common form, an output coupler consists of a partially reflective mirror, sometimes called a beamsplitter. The reflectance and transmittance of the mirror is usually determined by the gain of the laser medium. In some lasers the gain is very low, so the beam must make hundreds of passes through the medium for sufficient gain. In this case the output coupler may be as high as 99% reflective, transmitting only 1% of the cavity’s beam to be used. A dye laser has very high gain compared to most solid-state lasers, so the beam needs to make just a few passes through the liquid to reach its optimum gain, thus the output coupler is typically around 80% reflective. In others, such as an excimer laser, the 4% reflectivity of uncoated glass provides enough of a mirror, transmitting nearly 96% of the intracavity beam.