| Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2014: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2012: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Outline of Final Research Achievements |
The first chirality control of an optical vortex output from a vortex-pumped optical parametric oscillator was demonstrated. It is found that the chirality of the optical vortex was fully identical to that of the 1um pump vortex beam. Over 2mJ, 2um optical vortex with a topological charge of ± 1 was generated. It is also found that a fractional vortex with a half integer topological charge can also be selectively generated owing to a coherent coupling between the first-order vortex and Gaussian modes. Furthermore, a widely tunable mid-infrared (6.3 - 12um) optical vortex laser was established by employing a ZGP difference frequency generator pumped by a 2um optical vortex laser with a cascaded KTP geometry. The mid-infrared vortex output carried the same topological charge as that of the 1um pump output without any destruction. A pulse energy of over 0.1mJ was
measured in the wavelength region of 6.5-12um.
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