Talk:Arthur Leonard Schawlow

message: i have removed the reference to Schawlow's son Typing with just a hand on his shoulder via Facilitated Communication. It was unattributed(and probably untrue) 
"71.135.102.35 10:14, 3 March 2006 (UTC)
thread_title:  Son 

message: Can someone who knows how his last name is pronounced add an IPA pronunciation please? 149.217.1.6 16:23, 1 November 2007 (UTC)
thread_title:  Pronunciation of last name 

message: to mention the religion of his parent , being jewish , is it a nationality  —Preceding unsigned comment added by Moh sell (talk • contribs) 10:24, 23 October 2010 (UTC)
thread_title:  Is it necessary 

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thread_title:  External links modified 

message: This article states that Schawlow came up with the idea of using mirrors at the ends of the laser cavity. I was curious to see where this information came from, so I checked the sources, and could not find it anywhere. Does anyone know?
I remember the reading the story in a book written by Charles Townes, in which he describes it a little differently. I'll look up that source when I get a chance and maybe try to correct the article if need be. The sentence looks a little weird, because the resonant cavity of a maser is essentially a mirror on all sides at microwave wavelengths, with a small aperture at the end to serve as the output coupler. This works well when the wavelength is equal to the size of the cavity.
With lasers, however, the cavity is many, many times the wavelength. According to Townes, he could see that this meant if he used a cavity similar to a maser (mirrored on all sides) the light would be amplified in all directions instead of all in one direction. Townes puzzled over this problem, when Schawlow suggested using an open cavity (Mirrored only on the ends but not around the sides). By using an open cavity, any fluorescence emitted in directions other than along the beam path would be allowed to exit the cavity, thus would not be amplified. That allowed amplification along only one line, and is what made the idea complete, but of course this came at the expense of conversion efficiency. It was right after that when they published their famous paper in 1958, which kicked-off the race to build the first laser. Zaereth (talk) 01:41, 16 August 2017 (UTC)
thread_title:  Laser cavities