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OBSERVATION OF INTENSE SUPERRADIANT EMISSION IN THE HIGH‐GAIN INFRARED TRANSITIONS OF HF AND DF MOLECULES
1.Laser oscillations in the 2.7‐ and bands of HF and DF molecules formed chemically in a gaseous discharge were reported some time ago by T. F. Deutsch, Appl. Phys. Letters 10, 234 (1967).
1.Similar results obtained in a transverse discharge at the band of HF have recently been reported by M. C. Lin and W. H. Green, J. Chem. Phys. 53, 3383 (1970).
1.See also C. J. Ultee, IEEE J. Quantum Electron. QE‐6, 647 (1970). This publication shows the possibility of obtaining large gains in an electrically pulsed chemical HF laser.
2.For chemical HF and DF lasers produced in a supersonic flowing mixture of or with thermally heated see D. J. Spencer, H. Mirels, and T. A. Jacobs, Appl. Phys. Letters 16, 284 (1970).
2.For the application of flash photolysis, see J. H. Parker and G. C. Pimental, J. Chem. Phys. 51, 91 (1969).
3.A. J. Beaulieu, Appl. Phys. Letters 16, 504 (1970).
4.J. H. Parker and G. C. Pimental, J. Chem. Phys. 51, 91 (1969).
5.The transitions in the and bands ranged from P(3) to P(6) with P(3) generally being more intense. In the band the transitions P(4) through P(6) were observed with P(4) being the most intense.
6.In this process, the rapid decay of the HF molecules in the states to the will be dominated by type collisions with HF molecules in the state. However, the slower decay of the state will result from collisions with and molecules.
7.Under the high‐gain conditions, it was possible to trigger the amplifier into oscillation with a diffuse regenerative feedback. For instance, by holding a sheet of paper at the output end of the folded amplifier, it was possible to obtain strong oscillations. This could be detected by means of the feedback monitor (Fig. 1). For a discussion of nonresonant feedback and its implications see R. V. Ambartsumyan, N. G. Basov, P. G. Kryukov, and V. C. Letokhov, Soviet Phys. JETP 24, 481 (1967);
7.R. V. Ambarsumyan, P. G. Kryukov, and V. C. Letokhov, Soviet Phys. JETP 24, 1129 (1967).
8.When the device was used as a laser with regenerative feedback, the interferometer could be better aligned with respect to the incident beam without introducing feedback into the laser. Accordingly, a better system finesse was then obtained.
9.An additional source of the smearing of the spatial hole burning may also arise from a rapid variation of the refractive index during the build‐up of radiation within the resonator causing a wavelength sweeping of each mode. Such an index change may arise from molecular dissociation due to the current pulse and the buildup of population in the high‐gain amplifying transitions contributing to the refractive index.
10.R. M. Osgood, J. Goldhar, and R. McNair, IEEE J. Quantum Electron. (to be published).
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