7C2 - Theoretical and experimental investigation of regenerative laser amplifiers and their applications
- 1 September 1966
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Quantum Electronics
- Vol. 2 (9) , 549-552
- https://doi.org/10.1109/jqe.1966.1074121
Abstract
The quality factorQof optical resonators increases if the cavity losses are reduced by means of an active medium. In this case, the resonator works analogous to a classical RF amplifier, the amplification of which is increased by feedback. Significant for this amplifier type is increasing gainGand decreasing bandwidth\delta vwith increasing single-pass gain G0. An approximate theoretical treatment shows that the bandwidth root gain product should be a constant\delta v \sqrt{G}= const. Our experiments show that this relation is well performed at low signal intensities. At the point nearest to threshold a maximum gain of 20 000 and a minimum bandwidth of 2.104c/s was realized. The amplifier device was used for a measurement of electron densities down to 3.1012cm-3in a helium plasma.Keywords
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