[en] A Fast Optical Multichannel Analyzer (FOMA) was built for spectroscopic measurements with fast time resolution on the DIII-D tokamak. The FOMA utilizes a linear photodiode array (RETICON RL 1024 SA) as the detector sensor. An external recharge switch and ultrafast operational amplifiers permit a readout time per pixel of 300 ns. In conjunction with standard CAMAC digitizer and timing modules, a readout time of 500 μs is achieved for the full 1024-element array. Data acquired in bench tests and in actual spectroscopic measurements on the DIII-D tokamak is presented to illustrate the camera's capability. 4 refs., 3 figs