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Sensitivity enhancement in magnetic circular dichroism of absorption-detected electron paramagnetic resonance with a mirror cavity

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1 Author(s)
Koschnick, F.K. ; Department of Physics, University of Paderborn, 33095 Paderborn, Germany

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A mirror cavity was developed to improve the signal to noise (S/N) ratio of the measurement of the magnetic circular dichroism of the absorption (MCDA) and of the MCDA-detected electron paramagnetic resonance (EPR). In this cavity the measurement light beam passes through the sample several times due to reflections between two mirrors. With our first prototype we improved the S/N ratio of the MCDA of a GaAs sample with five passages through the sample by a factor of approximately 4. MCDA-detected EPR signals were improved by a factor of approximately 3. The gain in sensitivity of the mirror cavity is demonstrated using the well-known EL2+ defect. © 1997 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:68 ,  Issue: 6 )