High-power tunable, 05-3 THz radiation source based on nonlinear difference frequency mixing of CO_2 laser lines

2007 ◽  
Vol 24 (9) ◽  
pp. 2509 ◽  
Author(s):  
Sergei Ya. Tochitsky ◽  
Chieh Sung ◽  
Sarah E. Trubnick ◽  
Chan Joshi ◽  
Konstantin L. Vodopyanov
Keyword(s):  
High Power ◽  
Radiation Source ◽  
Difference Frequency ◽  
Thz Radiation ◽  
Frequency Mixing

scholarly journals Interaction of high power laser beam with magnetized plasma and THz generation

2010 ◽  
Vol 28 (4) ◽  
pp. 531-537 ◽  
Author(s):  
R.P. Sharma ◽  
A. Monika ◽  
P. Sharma ◽  
P. Chauhan ◽  
A. Ji
Keyword(s):  
Magnetic Field ◽  
Laser Beam ◽  
High Power ◽  
Nonlinear Interaction ◽  
Difference Frequency ◽  
Thz Radiation ◽  
High Power Laser ◽  
Power Laser ◽  
Circularly Polarized ◽  
Paraxial Ray

AbstractThis paper presents an investigation of the excitation of a Tera hertz (THz) radiation by nonlinear interaction of a circularly polarized high power laser beam and density ripple in collisionless magneto plasma. The ponderomotive force due to the nonlinear interaction between the laser and density ripple generates a nonlinear current at a difference frequency. If the appropriate phase matching conditions are satisfied and the frequency of the ripple is appropriate, then this difference frequency can be brought in the THz range. Filamentation (self focusing) of a circularly polarized beam propagating along the direction of ambient magnetic field in plasma is first investigated within paraxial ray approximation. The beam gets focused when the initial power of the laser beam is greater than its critical power. Resulting localized beam couples with the pre-existing density ripple to produce a nonlinear current driving the THz radiation. Analytical expressions for the beam width of the laser beam, electric vector of the THz wave have been obtained. By changing the strength of the magnetic field, one can enhance or suppress the THz emission. For typical laser beam and plasma parameters with the incident laser power flux = 1014 W/cm2, laser beam radius (r0) = 40 µm, laser frequency (ω0) = 1014 rad/s and plasma density (n0) = 3 × 1018 cm−3, normalized ripple density amplitude (μ) = 0.3, the produced THz emission can be at the level of Giga watt in power.

Continuously Frequency Tunable High Power Sub-THz Radiation Source—Gyrotron FU CW VI for 600 MHz DNP-NMR Spectroscopy

2010 ◽  
Vol 31 (7) ◽  
pp. 775-790 ◽  
Author(s):  
Toshitaka Idehara ◽  
Kosuke Kosuga ◽  
La Agusu ◽  
Ryosuke Ikeda ◽  
Isamu Ogawa ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
High Power ◽  
Radiation Source ◽  
Thz Radiation ◽  
Frequency Tunable

scholarly journals Optimization of slow-wave structure in high power 0.34 THz radiation source

2013 ◽  
Vol 62 (12) ◽  
pp. 120703
Author(s):  
Li Shuang ◽  
Wang Jian-Guo ◽  
Tong Chang-Jiang ◽  
Wang Guang-Qiang ◽  
Lu Xi-Cheng ◽  
...  
Keyword(s):  
Slow Wave ◽  
High Power ◽  
Radiation Source ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Thz Radiation

Difference-frequency mixing in AgGaS_2 by use of a high-power GaAlAs tapered semiconductor amplifier at 860 nm

1993 ◽  
Vol 18 (22) ◽  
pp. 1931 ◽  
Author(s):  
Ulrich Simon ◽  
Lew Goldberg ◽  
Frank K. Tittel
Keyword(s):  
High Power ◽  
Difference Frequency ◽  
Frequency Mixing
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