このエントリーをはてなブックマークに追加 Deliciousにブックマーク twitterに投稿する A "solar-pumped laser" system in Chitose

If magnesium oxide is given an energy corresponding to 20,000 °C, the bond between its oxygen and magnesium would be broken naturally. It means we can smelt magnesium with no catalyst. Is it possible to inject an energy which is equivalent to 20,000 °C?
You must have played with a magnifying lens to collect the sun light to burn a sheet of paper when you were a child. There is a theoretical upper limit in the temperature obtained by focusing the sun light, which is 6,000 °C. What this means is that no matter how much of the sun light is focused, it is not possible to surpass the temperature of its source, the sun. However, the human wisdom makes it possible to exceed this limit. It is “solar-pumped laser”.
The sun light arriving on the earth consists of light of various wavelengths. From shorter wavelength, they are ultraviolet light, visible light, infrared light and radio wave. What happens if much of this light of various wavelengths can be converted to light of one wavelength? Light of one wavelength, that is, the laser light, can be focused to a much narrower area than the original sun light, and it can produce a much higher temperature than 6,000 °C.
Our group has developed a laser device to make this possible. This device efficiently converts the sun light ranging from the blue light of about 400nm in wavelength to the near infrared light of about 900nm in wavelength to near infrared laser light of 1,064nm in wavelength.
The sun light is first focused on an area of about 2cm in diameter using a plastic Fresnel lens. A laser device placed in this area will then emit a strong near infrared light which will be further focused using a lens down to an area of less than 1mm in diameter to achieve an ultra high temperature.
We developed an economical and high-efficiency laser system that uses the Fresnel lens of 4m² surface area as sunlight collector and Cr-codoped Nd:YAG ceramic media, and achieved 80W output in 2007.

2 Comments to “An economical “Solar-pumped laser” produces ultra high temperature”

  1. [...] ・マグネシウム製造には大量のエネルギーが必要 ・低コストで超高温を実現する「太陽光励起レーザー」 ・レーザーでマグネシウムを製錬できるのか? [...]

  2. [...] 「低コストで超高温を実現する『太陽光励起レーザー』」で紹介したように、太陽光励起レーザーを使えば、単純に太陽光を集光するよりもはるかに高い温度を実現することができます [...]

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