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path difference
earth.sc., tech.	Schallwegunterschied m
opt.	Gangunterschied m
phys.	Gangunterschied m (of rays); Wegdifferenz f (of rays)
optical path difference
opt.	Gangdifferenz f (s. a. Gangunterschied); Gangunterschied m (the difference in linear distance travelled by two waves in a given time); Wegunterschied m

path difference: 22 phrases in 5 subjects

Astronomy	1
Electronics	2
Optics branch of physics	10
Physics	5
Radio	4