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Subharmonic Generation in an LC Resonant Josephson Tunnel Junction

We have measured up to 4 subharmonics at 10 GHz in an LC resonant Josephson tunnel junction by using the internal Josephson oscillator as a frequency tuned pump. The oscillator linewidth (6.5 MHz), output power (5 pW), and resonance Q-value (100) for the fundamental oscillation , n=1, agreed with the RSJ model for low critical currents. However for large critical currents and n=1 to 5, narrower linewidths (6.5 to 0.5 MHz), higher output power (5 to 60pW) and different Q's (40 to 530) were observed. These are interesting properties for oscillators where high power,narrow linewidths, and small Q's are required.