In this demonstration setup, P was maximized with R ～ 0.8, and P obtained with R ～ 0.99967 was about a factor of 10 smaller than that with R ～ 0.8. Therefore, if there was no effect of the absorption and scattering, the maximum obtainable thrust in the current PLT with R ～ 0.99967 is estimated to be ～ 350 μN. The maximum photon thrust, 35 μN, observed in the present PLT was obtained at a pump diode laser power a factor of 2 smaller than that of the maximum pump diode laser power limited by the crystal heating. If there was no heating effect, it was estimated that the current PLT with R ～ 0.99967 is estimated to generate ～ 70 μN, and additionally, if there was no effect from the absorption and scattering, its maximum obtainable thrust is estimated to be ～ 700 μN.
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