| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
We investigated the local refractive index change i.e., thermal lens effect, in an organic crystal induced by the pump beam during terahertz (THz) wave generation by measuring the focal position change of the probe beam. The measurement system of the thermal lens effect is based on the tunable THz source under difference frequency generation. The change in the focal length of the probe beam incident on the crystal coaxially with the pump beam was measured with and without the pump beam as a function of the incident power. In the case of the DAST crystal, the thermal lens effect was observed only on the a-axis of the crystal regardless of the polarization direction of the pump beam. It is anticipated that results obtained from our measurement technique will enable the development of a non-destructive inspection of the laser damage threshold of an organic nonlinear crystal.
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