  A room temperature operating Vertical External Cavity Surface Emitting Laser
is applied around 1550 nm to intracavity laser absorption spectroscopy analyzed
by time-resolved Fourier transform interferometry. At an equivalent pathlength
of 15 km, the high resolution spectrum of the semiconductor disk laser emission
covers 17 nm simultaneously. A noise equivalent absorption coefficient at one
second averaging equal to 1.5 10^{-10} cm^{-1}.Hz^{-1/2} per spectral element
is reported for the 65 km longest path length employed.
