Automation of a popular monochromator
- 1 July 1980
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 51 (7) , 968-971
- https://doi.org/10.1063/1.1136356
Abstract
A wavelength‐scan and intensity‐control system for a widely‐used, high‐intensity monochromator is described. The wavelength scan is bidirectional and variable speed, and may be controlled manually or by TTL logic from a computer. The intensity control is effected by use of a programmable dc power supply and D–A converter. Various filters are described which allow an intensity of up to 2×1014 photons/cm2 s to be achieved in a 1 cm×3 cm area over a wavelength range 0.76–2.50 μm, at 0.07 μm bandwidth, with a single grating. (A lesser intensity is available to 3.4 μm.) This wide range is made possible by the use of second‐order light from 0.76–1.00 μm. Photoconductivity data in GaAs:Cr and InP:Fe are presented, as an example.Keywords
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