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  1. See, for example, S. P. Reddy, W. Ivanic, 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 (1979).
    [CrossRef]
  2. M. Hercher, “The sperical mirror Fabry-Perot interferometer,” Appl. Opt. 7, 951 (1968); P. Connes, “Augmentation du produit luminosité x résolution des interférometres par l’emploi d’une différence de marche indépendente de l’incidence,” Rev. Opt. 35, 37 (1956); see also the use of a semiconfocal etalon by A. S. Pine, K. W. Nill, J. Mol. Spectrosc. 74, 43 (1978).
    [CrossRef] [PubMed]
  3. D. E. Jennings, “Absolute lines strengths in ν4, 12CH4: a dual-beam diode laser spectrometer with sweep integration,” Appl. Opt. 19, 2695 (1980).
    [CrossRef] [PubMed]
  4. The etalon produces a fringe pattern in He–Ne laser light and could be stabilized indefinitely, if necessary, to within ~1 MHz by locking to a He–Ne fringe. The FSR of 6328-Å He–Ne laser corresponds to 8 MHz at 12 μm.
  5. E. D. Hinkley, C. Freed, “Direct observation of the Lorenztian line shape as limited by quantum phase noise in a laser above threshold,” Phys. Rev. Lett. 23, 277 (1969).
    [CrossRef]
  6. D. E. Jennings, J. J. Hillman, “Shock isolator for diode laser operation on a closed-cycle refrigerator,” Rev. Sci. Instrum. 48, 1568 (1977).
    [CrossRef]
  7. The etalon cavity might also be used as a sample chamber in this mode to increase the effective optical path through the sample. This was tried here and found to enhance line absorptions by a factor of ~20.

1980

1979

1977

D. E. Jennings, J. J. Hillman, “Shock isolator for diode laser operation on a closed-cycle refrigerator,” Rev. Sci. Instrum. 48, 1568 (1977).
[CrossRef]

1969

E. D. Hinkley, C. Freed, “Direct observation of the Lorenztian line shape as limited by quantum phase noise in a laser above threshold,” Phys. Rev. Lett. 23, 277 (1969).
[CrossRef]

1968

Baldacci, A.

Devi, V. M.

Eng, R. S.

Freed, C.

E. D. Hinkley, C. Freed, “Direct observation of the Lorenztian line shape as limited by quantum phase noise in a laser above threshold,” Phys. Rev. Lett. 23, 277 (1969).
[CrossRef]

Hercher, M.

Hillman, J. J.

D. E. Jennings, J. J. Hillman, “Shock isolator for diode laser operation on a closed-cycle refrigerator,” Rev. Sci. Instrum. 48, 1568 (1977).
[CrossRef]

Hinkley, E. D.

E. D. Hinkley, C. Freed, “Direct observation of the Lorenztian line shape as limited by quantum phase noise in a laser above threshold,” Phys. Rev. Lett. 23, 277 (1969).
[CrossRef]

Ivanic, W.

Jennings, D. E.

D. E. Jennings, “Absolute lines strengths in ν4, 12CH4: a dual-beam diode laser spectrometer with sweep integration,” Appl. Opt. 19, 2695 (1980).
[CrossRef] [PubMed]

D. E. Jennings, J. J. Hillman, “Shock isolator for diode laser operation on a closed-cycle refrigerator,” Rev. Sci. Instrum. 48, 1568 (1977).
[CrossRef]

Mantz, A. W.

Rao, K. N.

Reddy, S. P.

Appl. Opt.

Phys. Rev. Lett.

E. D. Hinkley, C. Freed, “Direct observation of the Lorenztian line shape as limited by quantum phase noise in a laser above threshold,” Phys. Rev. Lett. 23, 277 (1969).
[CrossRef]

Rev. Sci. Instrum.

D. E. Jennings, J. J. Hillman, “Shock isolator for diode laser operation on a closed-cycle refrigerator,” Rev. Sci. Instrum. 48, 1568 (1977).
[CrossRef]

Other

The etalon cavity might also be used as a sample chamber in this mode to increase the effective optical path through the sample. This was tried here and found to enhance line absorptions by a factor of ~20.

The etalon produces a fringe pattern in He–Ne laser light and could be stabilized indefinitely, if necessary, to within ~1 MHz by locking to a He–Ne fringe. The FSR of 6328-Å He–Ne laser corresponds to 8 MHz at 12 μm.

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Figures (2)

Fig. 1
Fig. 1

PQ5 (15) doublet in ν9 of ethane near 809 cm−1 as calibrated with the 50-cm confocal etalon. The etalon pattern and ethane spectral were recorded simultaneously. The etalon fringes give a direct measure of the effective instrument function during the scan.

Fig. 2
Fig. 2

Spectra of a single fringe of the 50-cm confocal etalon. Single sweeps are 0.01 sec in duration. The etalon fringe width is 2 MHz; the 64-sweep average (0.7-sec integration time) fringe profile of ~7-Mhz width is due to broadening by laser frequency jitter. Laser frequency modulation due to refrigerator shocking is apparent in the fourth single sweep.

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