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 (1)

1985 (3)

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 (1)

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

1983 (2)

1980 (1)

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).

Appl. Opt. (1)

Appl. Phys. Lett. (1)

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

IEEE J. Quantum Electron. (1)

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

J. Opt. Soc. Am. A (1)

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

J. Opt. Soc. Am. B (2)

Opt. Lett. (2)

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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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