Thanks for looking it up! Since I am more familiar with rockets than with lasers, my first association with 'TEA' was 'triethylaluminum' [0] which can be used

Thanks for looking it up! Since I am more familiar with rockets than with lasers, my first association with 'TEA' was 'triethylaluminum' [0] which can be used to ignite rocket engines. See also [1]. Now that we know what to look for, it does state that but it is a few paragraphs (too far) into the text: If I understand it right, TEA stands for Transverse Excitation at Atmospheric pressure. Writing a name out in full when using it for the first time and denoting the abbreviation that will be used further in the text might be a good idea in general. [0] https://en.wikipedia.org/wiki/Triethylaluminium https://en.wikipedia.org/wiki/Triethylaluminium [1] https://en.wikipedia.org/wiki/Triethylborane#Rocket https://en.wikipedia.org/wiki/Triethylborane#Rocket