Why Does Diamond Absorb Infra-Red Radiation?
Why Does Diamond Absorb Infra-Red Radiation?
复制标题
为什么钻石会吸收红外线？
DOI：
10.1002/1521-396x(200210)193:3
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Z. Remeš
中科院分区：
文献类型：
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作者：
G. Davies;A. Mainwood;C. Piccirillo;K. Lewis;T. Mollart;M. Nesladek;Z. Remeš
金刚石被越来越多地用作传输红外辐射的窗口。我们在这里表明，在重要（co2激光）波长10.6 μm处的吸收涉及声子的同时破坏和产生。它在300 K < T < 650 K范围内的强烈温度依赖性被准确地描述为三个主要组成部分，没有任何可调参数：一个335 cm - 1声子的破坏和一个1275 cm - 1声子的产生；声子向低能量的转移；三声子过程包括一个声子的破坏和两个声子的产生。分析表明，为什么金刚石在用作高功率co2激光器的窗口时必须有效冷却。
Diamond is being increasingly used as a window for transmitting infra-red radiation. We show here that absorption at the important (CO 2 laser) wavelength of 10.6 μm involves the simultaneous destruction and creation of phonons. Its strong temperature dependence in the range 300 K < T < 650 K is accurately described, without any adjustable parameters, in terms of three main components: the destruction of one phonon of 335 cm - 1 and the creation of a second of 1275 cm - 1 ; the shift to lower energy of the phonons; and a three-phonon process involving the destruction of one and the creation of two phonons. The analysis demonstrates why diamond has to be effectively cooled when used for the windows of a high-power CO 2 laser.