| 摘要 |
<p>An upconversion laser system pumped by an infrared pump laser (14) comprises a crystalline lasing medium (4) comprising a host medium having a hexagonal crystal structure with the formulation AMX3, where A is a monovalent metal, M is a divalent metal and X is a halogen, and being doped with a rare earth material (an example of such a lasing medium is CsCdBr3 doped with Er). Means (16) are provided for coupling a pump laser beam into said crystalline lasing medium (4). Further are provided means (6, 8) for reflecting visible radiation generated by said lasing medium (4) in response to a pump laser beam in repeated passes through the lasing medium (4) to establish a visible output from said lasing medium (4). The system is operabel above cryogenic temperatures. <IMAGE></p> |
