J.P. Sattler

Diode laser heterodyne measurements on 14NH3

Abstract The frequencies of 32 absorption lines of 14 NH 3 were measured to within 2 × 10 −4 cm −1 in the 9- and 10-μm regions by use of a diode laser heterodyne spectrometer.

Diode laser spectra of the C-O stretch band of gaseous methyl alcohol

Abstract High-resolution diode laser spectra of the P and R branches of the C-O fundamental stretch band of gaseous methyl alcohol are presented. Spectral line assignments are made over the range 1027 through 1068 cm −1 . The relationship to other types of spectroscopy is discussed.

Diode laser heterodyne spectroscopy on the ν1 band of sulfur dioxide

Abstract Diode laser heterodyne techniques have been used to obtain the frequencies of 55 ir absorption lines of 32 S 16 O 2 . From these data and from previous microwave and millimeter wave measurements, new spectroscopic constants for the ν 1 band have been determined. The new constants have been used to predict new optically pumped submillimeter wave emissions.

Diode laser spectra of gaseous methyl alcohol

Abstract The infrared absorption spectrum near 1034 cm −1 of the C O stretch band of gaseous methyl alcohol has been measured with a lead-salt diode laser. Stark and heterodyne experiments have permitted the assignment of many J, n, τ. K transitions. The relationship of the infrared absorptions to photon-pumped submillimetre wave laser transitions is discussed

Heterodyne frequency measurements on carbonyl sulfide near 1050 cm−1

Abstract Heterodyne techniques have been used to measure the frequency differences between carbonyl sulfide (OCS) absorption lines and CO 2 laser transitions. A tunable diode laser was used both to scan the OCS absorption spectrum and to provide a beat signal against a CO 2 laser. Frequency differences as great as 8.6 GHz were measured. Many different OCS hot-band transitions were measured near 1050 cm −1 , and the measurements on the 02 0 0-00 0 0 band have been extended to such high J levels ( J ′ = 86) that higher-order centrifugal distortion terms are needed to fit the data.

Heterodyne measurements of infrared absorption frequencies of D 2 O

The frequencies of eight D2O infrared absorptions near 9.4 μm, which are used in optically pumped submillimeter-wave lasers, have been measured by heterodyning CO2 and tunable-diode-laser radiations.

New SMMW laser transitions optically pumped by a tunable CO 2 waveguide laser

Optical pumping of a submillimeter wave (SMMW) laser with a relatively compact RF-excited CW CO 2 laser is described. The increased frequency tunability of the waveguide pump laser has resulted in new low threshold SMMW emissions in C 2 H 2 F 2 , CDF 3 , and CD 2 F 2 by pumping into absorption lines which are beyond the tuning range of a conventional CO 2 laser. Frequency offsets and some assignments obtained with the aid of a tunable diode laser heterodyne spectrometer are reported.

Optically pumped CD 3 F submillimeter-wave laser

Submillimeter-wave laser action is reported for the first time in fully deuterated methyl fluoride. Twelve new laser lines were obtained by optical pumping with twelve CO(2) laser lines in the 9- and 10-microm regions. Milliwatt-level cw lasing was observed on two lines in an unoptimized hole-coupled waveguide resonator.

Diode laser heterodyne spectroscopy on the ν4 and ν9 bands of 1,1-difluoroethylene

Abstract Portions of the ν 4 and ν 9 bands of 1,1-difluoroethylene have been studied with a diode laser spectrometer. Line measurements were made by using markers produced by beating the output of the diode laser with the radiation from a CO 2 laser. With a dual trace oscilloscope presentation, frequencies of infrared lines could be rapidly determined with a precision of better than ± 6 MHz. Ground state constants were derived by combining microwave data with 10 combination differences obtained in this work. Upper state constants were obtained for both bands by combining the infrared measurements of this work with excited state microwave data and heterodyne measured submillimeter laser frequencies.

Technique for wideband, rapid, and accurate diode-laser heterodyne spectroscopy: measurements on 1,1-difluoroethylene

Refinements in the instrumentation of a diode-laser heterodyne spectrometer permit the rapid and routine measurement of infrared absorptions lying within 6.5 GHz of a CO2 laser emission to a precision and accuracy well within 10 MHz. Measurements on 1,1-difluoroethylene, which is used in optically pumped submillimeter-wave lasers, illustrate the technique.