1 November 1994 Diagnostic principles of four-wave mixing for plasmas
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A new method is used to diagnose plasma density space-profiles that involves phase conjugate reflection of four-wave mixing. Theoretical calculations for plasma parameters in the HT-6M tokamak show that two pump-wave beams (HCN laser), with a power of 1 W together with a signal beam (D2O or CH3F laser) of 0.1 W, can create a reflection of 0.1 to 0.43 mW with a phase conjugate to the signal where the cross section of all external beams is 1 cm2. This means that the reflective ratio of four-wave mixing is two orders larger than the ratio of laser superheating scatter. The lower power laser, therefore, can be used to diagnose plasmas.
Yuedong Meng, Yuedong Meng, Jiangang Li, Jiangang Li, Jiarong Luo, Jiarong Luo, } "Diagnostic principles of four-wave mixing for plasmas," Optical Engineering 33(11), (1 November 1994). https://doi.org/10.1117/12.183386 . Submission:

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