Abstract
Diamond is being increasingly used as a window for transmitting infra-red radiation. We show here that absorption at the important (CO/sub 2/ laser) wavelength of 10.6 mu m involves the simultaneous destruction and creation of phonons. Its strong temperature dependence in the range 300 K[left angle bracket]T[left angle bracket]650 K is accurately described, without any adjustable parameters, in terms of three main components: the destruction of one phonon of 335 cm/sup -1/ and the creation of a second of 1275 cm/sup -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/sub 2/ laser. (12 References).
| Original language | English |
|---|---|
| Pages (from-to) | 442-7 |
| Number of pages | 6 |
| Journal | PHYSICA STATUS SOLIDI A |
| Volume | 193 |
| Issue number | 3 |
| Publication status | Published - Oct 2002 |