Case, cut away to reveal the interior, containing ruby laser, the second to operate in the United Kingdom, made at the Services Electronics Research Laboratories, Baldock, in 1961 Ruby laser, the second to operate in the United Kingdom.
Neodymium YAG (yttrium aluminium garnet) laser by Services Electronics Research Laboratory, Worcester, 1966, the lamp and crystal are contained in a reflective ellispsoidal cavity Neodymium YAG (yttrium aluminium garnet) laser