Abstract

The detection of small absorptions using a laser absorption spectrometer (LAS) based on InGaAsP diode laser transmitter modules has been investigated. The modules are normally employed in optical communication systems and as such operate at 1.3 μm and have single-mode-fiber pigtails to couple the light out. The minimum detectable absorption of the LAS was found to be ~5 × 10−5 with harmonic detection and ~1 × 10−4 with sweep integration. The dominant noise source was caused by reflections off the cleaved end of the fiber pigtail. The strength and number of absorption lines in the 0.7–1.6-μm spectral region which are free from interference is considered for the major constituents of the atmosphere. It is found that there are sufficient strong isolated lines for trace gas detection and monitoring purposes using a LAS based on InGaAsP lasers and the reported minimum detectable absorption.

© 1988 Optical Society of America

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References

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  1. T. Gustavsson, H. Martin, “Low-Cost High-Resolution Laser Spectrometer System in the Near Infrared Region Using a GaAlAs Diode Laser,” Rev. Sci. Instrum. 57, 1132 (1986).
    [CrossRef]
  2. K. Uehara, “Signal Recording and Averaging in Diode-Laser Spectroscopy,” Opt. Lett. 12, 81 (1987).
    [CrossRef] [PubMed]
  3. V. Pevtschin, S. Ezekiel, “Investigation of Absolute Stability of Water-Vapor-Stabilized Semiconductor Laser,” Opt. Lett. 12, 172 (1987).
    [CrossRef] [PubMed]
  4. L. S. Rothman et al., “AFGL Atmospheric Absorption Line Parameters Compilation: 1982 Edition,” Appl. Opt. 22, 2247 (1983).
    [CrossRef] [PubMed]
  5. L. S. Rothman et al., “AFGL Trace Gas Compilation: 1982 Version,” Appl. Opt. 22, 1616 (1983).
    [CrossRef] [PubMed]
  6. 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 (1980).
    [CrossRef] [PubMed]
  7. D. T. Cassidy, J. Reid, “High-Sensitivity Detection of Trace Gases Using Sweep Integration and Tunable Diode Lasers,” Appl. Opt. 21, 2527 (1982).
    [CrossRef] [PubMed]
  8. J. Reid, D. Labrie, “Second-Harmonic Detection with Tunable Diode Lasers—Comparison of Experiment and Theory,” Appl. Phys. B 26, 203 (1981).
    [CrossRef]
  9. D. T. Cassidy, J. Reid, “Atmospheric Pressure Monitoring of Trace Gases Using Tunable Diode Lasers,” Appl. Opt. 21, 1185 (1982).
    [CrossRef] [PubMed]
  10. G. Wenke, Y. Zhu, “Comparison of Efficiency and Feedback Characteristics of Techniques of Coupling Semiconductor Lasers to Single-Mode Fiber,” Appl. Opt. 22, 3837 (1983).
    [CrossRef] [PubMed]
  11. H. Kuwahara, M. Sasaki, N. Tokoyo, “Efficient Coupling from Semiconductor Lasers into Single-Mode Fibers with Tapered Hemispherical Ends,” Appl. Opt. 19, 2578 (1980).
    [CrossRef] [PubMed]
  12. A significantly increased single-mode tuning range can be obtained with external cavity, distributed feedback (DFB), or distributed Bragg reflector lasers. Recently we obtained a single-mode tuning range of >3.5 cm−1 with an external-cavity InGaAsP diode laser.
  13. M. Johnson, “In-Line Fiber-Optical Polarization Transformer,” Appl. Opt. 18, 1288 (1979).
    [CrossRef] [PubMed]

1987 (2)

1986 (1)

T. Gustavsson, H. Martin, “Low-Cost High-Resolution Laser Spectrometer System in the Near Infrared Region Using a GaAlAs Diode Laser,” Rev. Sci. Instrum. 57, 1132 (1986).
[CrossRef]

1983 (3)

1982 (2)

1981 (1)

J. Reid, D. Labrie, “Second-Harmonic Detection with Tunable Diode Lasers—Comparison of Experiment and Theory,” Appl. Phys. B 26, 203 (1981).
[CrossRef]

1980 (2)

1979 (1)

Ballik, E. A.

Cassidy, D. T.

El-Sherbiny, M.

Ezekiel, S.

Garside, B. K.

Gustavsson, T.

T. Gustavsson, H. Martin, “Low-Cost High-Resolution Laser Spectrometer System in the Near Infrared Region Using a GaAlAs Diode Laser,” Rev. Sci. Instrum. 57, 1132 (1986).
[CrossRef]

Johnson, M.

Kuwahara, H.

Labrie, D.

J. Reid, D. Labrie, “Second-Harmonic Detection with Tunable Diode Lasers—Comparison of Experiment and Theory,” Appl. Phys. B 26, 203 (1981).
[CrossRef]

Martin, H.

T. Gustavsson, H. Martin, “Low-Cost High-Resolution Laser Spectrometer System in the Near Infrared Region Using a GaAlAs Diode Laser,” Rev. Sci. Instrum. 57, 1132 (1986).
[CrossRef]

Pevtschin, V.

Reid, J.

Rothman, L. S.

Sasaki, M.

Tokoyo, N.

Uehara, K.

Wenke, G.

Zhu, Y.

Appl. Opt. (8)

Appl. Phys. B (1)

J. Reid, D. Labrie, “Second-Harmonic Detection with Tunable Diode Lasers—Comparison of Experiment and Theory,” Appl. Phys. B 26, 203 (1981).
[CrossRef]

Opt. Lett. (2)

Rev. Sci. Instrum. (1)

T. Gustavsson, H. Martin, “Low-Cost High-Resolution Laser Spectrometer System in the Near Infrared Region Using a GaAlAs Diode Laser,” Rev. Sci. Instrum. 57, 1132 (1986).
[CrossRef]

Other (1)

A significantly increased single-mode tuning range can be obtained with external cavity, distributed feedback (DFB), or distributed Bragg reflector lasers. Recently we obtained a single-mode tuning range of >3.5 cm−1 with an external-cavity InGaAsP diode laser.

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Figures (5)

Fig. 1
Fig. 1

Output spectra at constant current level for two temperatures differing by 4 K.

Fig. 2
Fig. 2

A: output spectra at current of 80 mA. A-B: difference between spectra at a current of 80 and 85 mA, constant heat sink temperature.

Fig. 3
Fig. 3

Waveforms observed in sweep integration using presubtraction technique of data acquisition: (a) signal observed at the detector; (b) signal after presubtraction; (c) optical frequency of the laser as a function of time. The period of the waveforms is 2.5 ms.

Fig. 4
Fig. 4

Traces demonstrating the sensitivity of sweep integration method. The peak-to-peak tuning of the optical frequency of the laser is 0.165 cm−1 for this case.

Fig. 5
Fig. 5

Traces observed using second harmonic detection.

Tables (1)

Tables Icon

Table I Line Position, Intensity, and Concentration which gives an Absorption of 5 × 10−5 over a Path Length of 1 m for the Specified Molecule

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