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A fast mechanical shutter for spectroscopic applications

2000; IOP Publishing; Volume: 11; Issue: 4 Linguagem: Inglês

10.1088/0957-0233/11/4/308

1361-6501

Paul C. Miles, Robert S. Barlow,

Spectroscopy and Laser Applications

The design and implementation of a fast mechanical shutter for the entrance slit of a spectrograph is presented. The shutter allows the high quantum efficiency, dynamic range and spatial resolution of back-illuminated CCD detectors to be exploited for laser-spectroscopic measurements in environments where continuous background interference exists. It permits a 9.1 µs exposure for a 0.8 mm slit width and has 100% transmission and virtually infinite attenuation in the closed state. Additionally, timing signals are generated in order to permit synchronous laser operation. Testing of the shutter demonstrates that good suppression of background radiation is obtained in Raman line-imaging experiments performed in luminous, partially premixed flames. Shot-noise-limited single-laser-pulse Raman scattering measurements in air are also demonstrated.