Abstract
A coherent 1.06 μm all solid state laser radar system is proposed. The system uses a LD pumped monolithic Nd:YAG ring laser as the source. Very stable output of the laser is linearly frequency modulated by an acousto-optic modulator. The wide modulation bandwidth is achieved by cascading two Bragg cells, in which each cell produces half of the total bandwidth. In order to extinguish the laser beam deflection caused by the Bragg cell, the propagation directions for the acoustic waves are arranged to be opposite in the two cells. Two single mode optical fiber couplers are utilized. One is used as a beam splitter and divides the modulated laser beam into two parts: the transmitted signal beam and the local reference beam. The other coupler mixes the target-reflected signal beam with the local reference beam. The output signal from this coupler is detected by an InGaAs PIN photo diode, then analyzed by a RF electronic spectrum analyzer. The linearly frequency modulated CW ladar system can be applied for measuring both range and velocity of the target. Using this ladar system, true 3-D target imaging can be achieved by additional use of a laser beam-scanning device.
| Original language | English |
|---|---|
| Pages (from-to) | 1-7 |
| Number of pages | 7 |
| Journal | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 4223 |
| DOIs | |
| Publication status | Published - 2000 |
| Event | Instruments for Optics and Optoelectronic Inspection and Control - Beijing, China Duration: 8 Nov 2000 → 10 Nov 2000 |