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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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.