Imperial College London
Alternate

ProfessorMichaelDamzen

Faculty of Natural Sciences, Department of Physics

Professor of Experimental Laser Physics
 
 
 
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Contact

 

+44 (0)20 7594 7783m.damzen Website

 
 
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Location

 

610Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Tawy:2019:10.1364/oe.27.035865,
author = {Tawy, G and Wang, J and Damzen, M},
doi = {10.1364/oe.27.035865},
journal = {Optics Express},
pages = {35865--35883},
title = {Pump-induced lensing effects in diode pumped Alexandrite lasers},
url = {http://dx.doi.org/10.1364/oe.27.035865},
volume = {27},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - It is essential to understand the pump-induced lensing and aberration effects in solid-state lasers, such as Alexandrite, since these set limits on laser power scaling whilst maintaininghigh spatial TEM00beam quality. In this work, we present direct wavefront measurements ofpump-induced lensing and spherical aberration using a Shack-Hartmann wavefront sensor, for thefirst time, in a diode-pumped Alexandrite laser, and under both non-lasing and lasing conditions.The lens dioptric power is found to be weakly sub-linear with respect to the absorbed pumppower, and under lasing, the lensing power is observed to decrease to60 %of its non-lasingvalue. The results are inconsistent with a thermal lens model but a fuller theoretical formulationis made of a combined thermal and population lens model giving good quantitative agreementto the observed pump power dependence of the induced-lensing under non-lasing conditionsand the reduced lensing under lasing conditions. The deduced value for the difference inexcited to ground state polarizability is consistent with prior measurement estimates for otherchromium-doped gain media. The finding of this paper provide new insight into pump-inducedlensing in Alexandrite and also provides a basis for a fast saturable population lens mechanism toaccount for self-Q-switching observed recently in Alexandrite laser systems.
AU  - Tawy,G
AU  - Wang,J
AU  - Damzen,M
DO  - 10.1364/oe.27.035865
EP  - 35883
PY  - 2019///
SN  - 1094-4087
SP  - 35865
TI  - Pump-induced lensing effects in diode pumped Alexandrite lasers
T2  - Optics Express
UR  - http://dx.doi.org/10.1364/oe.27.035865
UR  - http://hdl.handle.net/10044/1/75242
VL  - 27
ER  -
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