Sensitive detection of acetylene absorption in the visible by using a stabilized AlGaAs diode laser.
Overtone transitions of C(2)H(2) at ~ 789 nm are investigated by means of an AlGaAs laser operating in an external optical cavity configuration. Relative amplitude noise is of a few parts in 10(6) (ppm) and permits an absorption detection limit of 0.2 ppm/km. Self-broadening and air broadening is measured for two components of the observed band [P(11) at 12646.966 and R(5) at 12688.699 cm(-1)].
Pavone
F S
FS
Marin
F
F
Inguscio
M
M
Ernst
K
K
Lonardo
G D
GD