| 摘要 |
A laser rangefinder comprises a semiconductor laser diode (2), a transmission/receiver lens (1), an integrated optics waveguide switch (3) and a photodetector (4). In the transmit mode the laser and one arm (11) of the waveguide switch (3) and an intermediate single mode optical fibre (8) are coupled to form an extended-cavity laser oscillator. In the receive mode the laser acts as an optical amplifier for received pulses and is coupled to the photodetector. Switching of the waveguide switch, by application of a pulse to the gating input, causes switching between the receive and transmit modes. The semiconductor laser diode is permanently current biassed above its oscillation threshold. <IMAGE>
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