DETERMINATION OF 8--15 MICRON SIMULTANEOUS TRANSITION STABILITY UTILIZING REAL TIME VISIBLE DISPLAY IR DETECTION
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Date
1970
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Ohio State University
Abstract
IR detection by thermal quenching of ultraviolet excited phosphorescent screens provides a visible $display^{1}$ of the quenching radiation’s spatial distribution and termporal continuity. By dispersing the IR beam onto the screen, the grating wavelength dependent function determines the line’s visible screen location. An axis on the screen can be directly calibrated in wavelength for convenient employment. Such a technique allows simultaneous observation of all IR transitions occuring within the frequency range of the instrument during the relaxation time of the screen. A concentric plasma laser cavity provides isolated multiline transitions from different vibrational bands of the lasing $molecule.^{2}$ With $CO_{2}$, isolated multiline transitions have been produced from 8--15 microns---see figure $1^{3, 4}$. Understanding the mechanism producing this required spectral/temporal continuity measurement. Whether the observed broadband multiline emission is truly or quasi continuous---as certain dynamic theory suggests---has been determined. A number of lasers appearing to possess a stable single line have been found to emit primarily on this line with wandering to other lines for short durations. Such a technique has proven itself extremely convenient and valuable in these quarters. Efforts are underway to increase the intensity resolution and extend the operating range from 3--30 microns.
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$^{1}$J. E. Kiefer, A. Yariv, Appl. Phys. Letters 15, 26 (1969) $^{2}$J. A. Birken, R. G. Seed, J. A. Macken, to be published. $^{3}$J. A. Birken, R. G. Seed, J. A. Macken, Laser Session---this symposium. $^{4}$W. S. Benedict, private communication.""
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