abstract
acronym
amplification
arose
article
atom
beam
built
chill
cloud
coaxial
colleagues
concept
contemporary
create
decibels
development
device
early
electromagnetic
emission
emit
factor
feedback
field
formaldehyde
gas
gigahertz
high
hydrogen
hydroxyl
illustration
infrared
kelvin
keyword
keywords
laser
maser
methanol
micrometer
microwave
milliwatt
molecules
observed
optical
oscillations
oscillator
population
power
powerful
refrigerated
resonant
ruby
space
spectrum
stimulated
suggested
tag
tags
telescopes
term
terms
transition
transmitter
typography
vibrational
water
word
words