7-11 July 2014
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=16&confId=34"><font color=#0000ff>SAIP2014 Proceedings published on 17 April 2015</font></a>

A New Technique to Electro-Optically Q-switch Uniaxial Gain Materials.

10 Jul 2014, 10:20
D Les 102

D Les 102

Oral Presentation Track C - Photonics Photonics


Mr Loyiso Maweza (CSIR)

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Main supervisor (name and email)<br>and his / her institution

Dr. Hencharl Strauss and hstrauss@csir.co.za

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Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

We introduce a new technique of Electro-Optic Q-switching which exploits the polarization dependence of a uniaxial gain medium. Conventional Electro-Optic Q-switched cavities require both a polarizer and a wave plate in addition to an Electro-Optic Modulator (EOM) which rotates the beam polarization within a few nano-seconds. The new technique eliminates the need for a polarizer, which is an advantage for short pulse, high peak power Q switched lasers. This is because polarizers are susceptible to damage and can significantly lengthen the cavity, which increases the output pulse length.

Uniaxial gain materials like Nd:YVO4 have different thermo-dioptric constants in two crystallographic directions, which causes the two polarization states to experience different thermal lens strengths for a-cut crystals. The cavity can be switched between stable and unstable states by rotating the polarization with a Pockels cell. The results in a rapid change in the cavity quality, which Q-switches the resonator.

The presentation will first review conventional Electro-Optic Q-switched methods after which the new technique will be introduced. It will then be shown how the new technique was implemented in a short Nd:YVO4 cavity. The experiments confirmed that the new technique is viable and operating regimes, advantages and disadvantages of the new technique will be presented.

Primary author

Mr Loyiso Maweza (CSIR)


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