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Development and performance of a laser heterodyne spectrometer using tunable semiconductor lasers as local oscillators
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kostiuk, T. Jennings, D. E. Mumma, M. J. Glenar, D. |
| Copyright Year | 1980 |
| Description | A diode laser based IR heterodyne spectrometer for laboratory and field use was developed for high efficiency operation between 7.5 and 8.5 microns. The local oscillator is a PbSSe tunable diode laser kept continuously at operating temperatures of 12-60 K using a closed cycle cooler. The laser output frequency is controlled and stabilized using a high precision diode current supply, constant temperature controller, and a shock isolator mounted between the refrigerator cold tip and the diode mount. Single laser modes are selected by a grating placed in the local oscillator beam. The system employs reflecting optics throughout to minimize losses from internal reflection and absorption, and to eliminate chromatic effects. Spectral analysis of the diode laser output between 0 and 1 GHz reveals excess noise at many diode current settings, which limits the infrared spectral regions over which useful heterodyne operation can be achieved. System performance has been studied by making heterodyne measurements of etalon fringes and several Freon 13 (CF3Cl) absorption lines against a laboratory blackbody source. Preliminary field tests have also been performed using the Sun as a source. |
| File Size | 537096 |
| Page Count | 10 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800021166 |
| Archival Resource Key | ark:/13960/t6wx26f97 |
| Language | English |
| Publisher Date | 1980-08-01 |
| Access Restriction | Open |
| Subject Keyword | Lasers And Masers Infrared Detectors Semiconductor Lasers Optical Heterodyning Spectral Resolution Spectrum Analysis Tunable Lasers Laser Spectroscopy Line Spectra Diodes Noise Spectra Oscillators Operating Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
