air breathing laser
(ABL)吸气式激光器，气动光器

• fluorscopy
• fluorsosilicate crown glass
• fluorspar
• fluosilicate titanium
• flush bolt
• flute
• fluted
• fluted spectrum
• fluting
• flutter
• flux
• flux concentration
• flux density
• flux-grown
• flux-grown ruby
• fluxmeter
• flux of light method
• flux of radiation
• flux refraction
• flux rise time
• flyback
• flyback pulse
• fly-by-night
• fly eye lens plate
• flying