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Question:
Is running cost of a solar-pumped-laser device free?
Don’t you need energy for sun-autoguider or cleaning cost of a Fresnel lens (especially in a desert) ?

Answer:
The energy required for automatic suntracking system is an order of W and is negligibly small. We can use a small photovoltaic cell since sunlight is available.

Air shower is sufficient for cleaning the lens. Of course it is driven by photovoltaic cell. If we use water to wash the lens, it will be hard to clean out the sand because it will be caked with mud.
Once every few days of air shower might be sufficient. Therefore its energy is negligible. Only serious problem is the damage on the lens owing to sand, but we already resolved this problem but we can not disclose this method because it is an important patent. If you go to Middle East by yourself, you will find that the windows of the hotel have no damage. This is only thing I can tell you at present.
(YABE Takashi)

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