A technique employing pressure modulation is described which minimizes all interference fringing produced in small base length multipass absorption cells in diode laser studies.

© 1990 Optical Society of America

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  1. J. U. White, “Long Optical Paths of Large Aperture,” J. Opt. Soc. Am. 32, 285–288 (1942).
  2. D. Horn, G. C. Pimentel, “2.5-km Low-Temperature Multiple-Reflection Cell,” Appl. Opt. 10, 1892–1898 (1971).
    [CrossRef] [PubMed]
  3. D. R. Herriott, H. Kogelnik, R. Kompfner, “Off-Axis Paths in Spherical Mirror Interferometers,” Appl. Opt. 3, 523–526 (1964).
  4. J. Reid, M. El-Sherbiny, B. K. Garside, E. A. Ballik, “Sensitivity Limits of a Tunable Diode Laser Spectrometer, with Application to the Detection of NO2 at the 100-ppt Level,” Appl. Opt. 19, 3349–3354 (1980).
    [CrossRef] [PubMed]
  5. T. Iguchi, “Modulation Waveforms for Second-Harmonic Detection with Tunable Diode Lasers,” J. Opt. Soc. Am. B 3, 419–423 (1986).
  6. J. A. Silver, A. C. Stanton, “Optical Interference Fringe Reduction in Laser Absorption Experiments,” Appl. Opt. 27, 1914–1916 (1988).
    [CrossRef] [PubMed]
  7. S. P. Reddy, W. Ivancic, V. M. Devi, A. Baldacci, K. N. Rao, A. W. Mantz, R. S. Eng, “Tunable Diode Laser Spectroscopy in the Infrared: Some Practical Considerations of Techniques and Calibration with ν2 Lines of HCN,” Appl. Opt. 18, 1350–1354 (1979).

1988 (1)

1986 (1)

1980 (1)

1979 (1)

1971 (1)

1964 (1)

1942 (1)

Baldacci, A.

Ballik, E. A.

Devi, V. M.

El-Sherbiny, M.

Eng, R. S.

Garside, B. K.

Herriott, D. R.

Horn, D.

Iguchi, T.

Ivancic, W.

Kogelnik, H.

Kompfner, R.

Mantz, A. W.

Pimentel, G. C.

Rao, K. N.

Reddy, S. P.

Reid, J.

Silver, J. A.

Stanton, A. C.

White, J. U.

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Figures (2)

Fig. 1
Fig. 1

Second harmonic absorption spectra (4000 sweeps averaged in 2.7 min) for 384 ppbv of CO producing a line center absorbance of 1.3 × 10−5. Each channel number is equal to 7.1 × 10−4 cm−1. The arrows indicate the line center position as determined using a separate high concentration reference cell: (a) four-pass cell fringes with no modulation; (b) residual two-pass cell fringes with PZT field mirror modulation; (c) pressure modulation of 15–35 Torr with no PZT modulation. The CO absorption line is now clearly visible.

Fig. 2
Fig. 2

Second harmonic absorption spectra (8000 sweeps averaged in 5.4 min) for 246 ppbv of CO (line center absorbance of 8.3 × 10−6) using the same line as Fig. 1 and pressure modulation. The vertical sensitivity is 1.5 times that of Fig. 1.