PT Journal AU Hocker, LO Sokoloff, DR Daneu, V Szoke, A Javan, A TI Frequency mixing in the infrared and far-infrared using a metal-to-metal point contact diode SO Applied Physics Letters JI Appl Phys Lett PY 1968 VL 12 IS 12 DE optical antennas AB Metal‐to‐metal point contact diodes were used to obtain the 54‐GHz beat notes between two adjacent 10.6‐μ CO2 laser transitions. The speed of the diodes in the far‐infrared is at least 1000 GHz. This was tested with a 337‐μ HCN laser. ER