The performance and the characteristics of an interferometric double-mirror spectrometer with uncollimated light are studied by measuring spectra of different radiation sources. The stationary interferometer is fabricated without a beam splitter or moving components. The measured interferogram visibilities, which are limited by the size of the source aperture, agree with the theoretical predictions for a slit and a circular source aperture. By background subtraction the effect of detection nonuniformity can be radically reduced to increase the dynamics and the resolving power of the spectrometer. We used a mercury pencil lamp for measurement and found that the dynamic range was ~80 dBm. When isolated spectral lines are measured, the resolving power can be improved by squeezing more than half of a spatial interference cycle onto one pixel. The maximum resolving power reached in measuring the spectra of a diode laser was 1600. The instrument is applicable to a wide range of measurements, such as the recording of temporally variant, wideband radiation sources and the monitoring of laser wavelength.
[1]
T. Veijola,et al.
Fourier transform wavemeter
,
1987
.
[2]
J. Kauppinen,et al.
Performance limits of stationary Fourier spectrometers
,
1991
.
[3]
J. J. Snyder,et al.
Single-shot spectral measurements and mode correlations in a multimode pulsed dye laser
,
1984
.
[4]
J. Kauppinen.
Correction of the linear phase errors of one-sided interferograms
,
1976
.
[5]
T H Barnes.
Photodiode array Fourier transform spectrometer with improved dynamic range.
,
1985,
Applied optics.
[6]
S Kawata,et al.
Fourier transform spectrometer with a self-scanning photodiode array.
,
1984,
Applied optics.