Flight qualification of a diode laser for path difference determination ofa high-resolution Fourier transform spectrometer

Diode lasers offer a lightweight, rugged, and economic alternative to other types of laser but they often do not provide long-term stability! and spec tral purity of emission; We have developed a stabilized, near-infrared diod e laser source that is capable of as much as 20 mW of single-mode output po wer for the effective replacement of a He-Ne laser in the path difference m easuring system of a high-resolution (1.25-m maximum path difference) Fouri er transform spectrometer. Laser characterization has been performed both i n laboratory measurements and in flight tests, resulting in. relative frequ ency stability of better than 10(-6) on a 6-h flight. (C) 2000 Optical Soci ety of America.