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Author Hocker, L. O.; Sokoloff, D. R.; Daneu, V.; Szoke, A.; Javan, A. openurl 
  Title Frequency mixing in the infrared and far-infrared using a metal-to-metal point contact diode Type Journal Article
  Year 1968 Publication Applied Physics Letters Abbreviated Journal Appl Phys Lett  
  Volume 12 Issue 12 Pages (down)  
  Keywords optical antennas  
  Abstract 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.  
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  Call Number RPLAB @ gujma @ Serial 742  
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Author Baryshev A.; Hovenier J.N.; Adam A.J.L.; Kašalynas I.; Gao J.R.; Klaassen T.O.; Williams B.S.; Kumar S.; Hu Q.; Reno J.L. openurl 
  Title Phase locking and spectral linewidth of a two-mode terahertz quantum cascade laser Type Journal Article
  Year 2006 Publication Physics Letters Abbreviated Journal  
  Volume 89 Issue Pages (down)  
  Keywords  
  Abstract We have studied the phase locking and spectral linewidth of an ~ 2.7 THz quantum cascade laser by mixing its two lateral lasing modes. The beat signal at about 8 GHz is compared with a microwave eference by applying conventional phase lock loop circuitry with feedback to the laser bias current. Phase locking has been demonstrated, resulting in a narrow beat linewidth of less than 10 Hz. Under requency stabilization we find that the terahertz line profile is essentially Lorentzian with a minimum linewidth of ~ 6.3 kHz. Power dependent measurements suggest that this linewidth does not approach the Schawlow-Townes limit.  
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  Call Number RPLAB @ atomics90 @ Serial 967  
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