Abstract

We report the demonstration of two-tone optical heterodyne spectroscopy with a tunable lead-salt diode laser. Using high-frequency modulation of the diode-laser injection current, we demonstrated a detection-sensitivity limit of 1 × 10−5 to differential absorption from Doppler-broadened NH3 lines in the 930-cm−1 region. In our experiment, this limit was set by preamplifier noise and the low quantum efficiency of the photodetector. A substantial increase in sensitivity should be possible by using an improved detector, an improved preamplifier, and higher optical power.

© 1986 Optical Society of America

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References

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  1. G. C. Bjorklund, Opt. Lett. 5, 15 (1980).
    [CrossRef] [PubMed]
  2. M. Gehrtz, G. C. Bjorklund, E. A. Whittaker, J. Opt. Soc. Am. B 2, 1510 (1985).
    [CrossRef]
  3. W. Lenth, M. Gehrtz, Appl. Phys. Lett. 47, 1263 (1985).
    [CrossRef]
  4. W. Lenth, Opt. Lett. 8, 575 (1983).
    [CrossRef] [PubMed]
  5. W. Lenth, IEEE J. Quantum Electron. QE-20, 1045(1984).
    [CrossRef]
  6. W. Lenth, M. Gehrtz, A. T. Young, J. Opt. Soc. Am. A 2(13), P99 (1985).
  7. G. R. Janik, C. B. Carlisle, T. F. Gallagher, J. Opt. Soc. Am. B 3, 1070 (1986).
    [CrossRef]
  8. L. S. Rothman, A. Goldman, J. R. Gillis, R. R. Gamache, H. M. Pickett, R. L. Poynter, N. Husson, A. Chedin, Appl. Opt. 22, 1616 (1983).
    [CrossRef] [PubMed]

1986

1985

W. Lenth, M. Gehrtz, A. T. Young, J. Opt. Soc. Am. A 2(13), P99 (1985).

M. Gehrtz, G. C. Bjorklund, E. A. Whittaker, J. Opt. Soc. Am. B 2, 1510 (1985).
[CrossRef]

W. Lenth, M. Gehrtz, Appl. Phys. Lett. 47, 1263 (1985).
[CrossRef]

1984

W. Lenth, IEEE J. Quantum Electron. QE-20, 1045(1984).
[CrossRef]

1983

1980

Bjorklund, G. C.

Carlisle, C. B.

Chedin, A.

Gallagher, T. F.

Gamache, R. R.

Gehrtz, M.

W. Lenth, M. Gehrtz, A. T. Young, J. Opt. Soc. Am. A 2(13), P99 (1985).

M. Gehrtz, G. C. Bjorklund, E. A. Whittaker, J. Opt. Soc. Am. B 2, 1510 (1985).
[CrossRef]

W. Lenth, M. Gehrtz, Appl. Phys. Lett. 47, 1263 (1985).
[CrossRef]

Gillis, J. R.

Goldman, A.

Husson, N.

Janik, G. R.

Lenth, W.

W. Lenth, M. Gehrtz, A. T. Young, J. Opt. Soc. Am. A 2(13), P99 (1985).

W. Lenth, M. Gehrtz, Appl. Phys. Lett. 47, 1263 (1985).
[CrossRef]

W. Lenth, IEEE J. Quantum Electron. QE-20, 1045(1984).
[CrossRef]

W. Lenth, Opt. Lett. 8, 575 (1983).
[CrossRef] [PubMed]

Pickett, H. M.

Poynter, R. L.

Rothman, L. S.

Whittaker, E. A.

Young, A. T.

W. Lenth, M. Gehrtz, A. T. Young, J. Opt. Soc. Am. A 2(13), P99 (1985).

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Figures (3)

Fig. 1
Fig. 1

Experimental arrangement for two-tone optical heterodyne spectroscopy with a tunable lead-salt diode laser.

Fig. 2
Fig. 2

(a) Single-mode laser sweep through a pair of NH3 lines near 930 cm−1. (b) Repeat trace with −2 dBm of RF power at 110.5 and 109.5 MHz supplied to the diode laser.

Fig. 3
Fig. 3

(a) Two-tone heterodyne signal at 1 MHz as diode-laser carrier is swept through two NH3 lines of 27 and 2.3% total absorption. (b) Repeat scan at 10× expanded scale of the weaker NH3 absorption line.

Equations (2)

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E ( t ) = E 0 [ 1 + M 1 sin ( ω 1 t + ψ 1 ) ] [ 1 + M 2 sin ( ω 2 t + ψ 2 ) ] × exp [ i ( ω 0 t + β 1 sin ω 1 t + β 2 sin ω 2 t ) ] ,
I ( t ) = c E 0 2 8 π exp ( - 2 δ 0 ) [ β 2 ( 2 δ 0 - δ + - δ - ) + 2 M β ( δ - - δ + ) sin ψ + M 2 ( 2 - 2 δ 0 - δ + - δ - ) ] cos Ω t .

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