| 摘要 |
<p>A semi-conductor light source comprising a single piece of semi-conductor material having formed therein a semi-conductor laser and a semi-conductor optical detector. The semi-conductor laser having a first optical output port, a second optical output port, and a resonant cavity arranged so that in use light is emitted simultaneously through the first and second optical output ports. The semi-conductor laser also includes a pair of reflecting surfaces at right angles to one another which couple an optical output from said first optical output port into said detector.</p> |
