Full text loading...
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Four‐Hundredth‐Order Harmonic Mixing of Microwave and Infrared Laser Radiation Using a Josephson Junction and a Maser
1.D. G. McDonald, A. S. Risley, J. D. Cupp, and K. M. Evenson, Appl. Phys. Letters 18, 162 (1971).
2.K. M. Evenson, J. S. Wells, and L. M. Matarrese, Appl. Phys. Letters 16, 251 (1970).
3.B. D. Josephson, Rev. Mod. Phys. 36, 216 (1964).
4.J. M. Manley and H. E. Rowe, Proc. IRE 44, 904 (1956).
5.J. E. Zimmerman and N. V. Frederick, Appl. Phys. Letters 19, 16 (1971). In this work it was shown that the output power of a Josephson junction in a SQUID configuration could be increased by a factor of 10 if the bias frequency were increased by the same factor. Our work is with a current‐biased device and spans a much greater range of intermediate frequencies but not with such ideal behavior.
6.L. M. Matarrese and K. M. Evenson, Appl. Phys. Letters 17, 8 (1970).
7.It should be noted in what follows in the text that the basic experiment is down‐converting a fixed frequency signal at 35 GHz, i.e., the infrared frequencies are not changed at all. Consequently, one might expect the same results in the infrared experiments as with an applied signal at 35 GHz. However, to produce a 35‐GHz signal from two infrared sources, substantially more power must be applied to the junction than in the microwave case (see the theory of Ref. 1), and therefore junction performance is expected to be different (indeed, the Josephson effect can be suppressed with sufficient applied power).
8.We did two calibrations of this frequency and obtained 3.8217733 and 3.8217755 THz±3.0 MHz (uncertainty in setting the laser on the peak of its gain curve), both in excellent agreement with K. M. Evenson, J. S. Wells, L. M. Matarrese, and L. B. Elwell [Appl. Phys. Letters 16, 159 (1970)].
9.For the usual resistive or diode mixer, the available output power tends to be independent of the intermediate frequency.
10.Obviously the actual physical processes are far more complicated than this simple sideband counting scheme suggests.
11.A description of this system will be submitted for publication by J. Robert Ashley, A. S. Risley, and Frank M. Palka [IEEE Trans. Microwave Theory Tech. (to be published)].
12.The largest step we have produced at 3.8 THz is in a junction with a critical current of 150 μA and a normal state resistance of 10 Ω. Since the step and beat amplitudes increase with power up to the maximum 3.8‐THz power that is available (≈ 5 mW), larger beat signals could be obtained if more laser power were available. It was possible to suppress the supercurrent only by a factor of 2 in the junctions normally used, i.e., for critical currents
13.R. L. Abrams and W. B. Gandrud, Appl. Phys. Letters 17, 150 (1970);
13.D. R. Sokoloff, A. Sanchez, R. M. Osgood, and A. Javan, Appl. Phys. Letters 17, 257 (1970)., Appl. Phys. Lett.
Article metrics loading...