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Double resonance and four wave mixing FEL studies of InAs/GaAs quantum dots and local modes in ionic crystals

Pidgeon, C. R., Wells, J.-P. R., Bradley, I. V. and Murdin, B. N. (2000) Double resonance and four wave mixing FEL studies of InAs/GaAs quantum dots and local modes in ionic crystals In: 25th International Conference on Infrared and Millimeter Waves (Cat. No.00EX442).


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A brief review is given of lifetime and line broadening studies with the free electron laser at FOM-Rijnhuizen (FELIX), emphasising work on far infrared (FIR) modulated photoluminescence (PL) of bound-to-bound transitions in InAs/GaAs quantum dots and mid-infrared (MIR) four wave mixing experiments on localised modes of H- ions in calcium fluoride crystals. We have made new far/near infrared double resonance measurements of self-assembled InAs/GaAs quantum dots. The FIR resonance is unambiguously associated with a bound-bound intraband transition in the neutral dots, and analysis of the FIR double resonance linewidth enables us to show that the inhomogeneous broadening of the PL cannot be attributed solely to size and composition fluctuation. In addition we have made time resolved studies of local modes in ionic crystals, where nonradiative decay plays an important role in the optical pumping cycle of laser gain media. We have made pump-probe studies of the local modes created upon the introduction of a light impurity, in particular the H - ion, in CaF2 in the spectral region 700 to 1200 cm-1. We have also measured the free induction decay of this mode using a noncollinear degenerate four wave mixing geometry. The observed coherent transient is striking in having large quantum beat modulations at negative time which are associated with vibrational ladder climbing.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Authors :
Murdin, B.
Date : 12 September 2000
Identification Number : 10.1109/ICIMW.2000.892982
Additional Information : In Conference Digest of the 2000 25th International Conference on Infrared and Millimeter Waves, 2000. , pp. 163-164.© 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Depositing User : Mr Adam Field
Date Deposited : 27 May 2010 14:44
Last Modified : 31 Oct 2017 14:03

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