<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div></div><div data-marker="__QUOTED_TEXT__"><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000;" data-mce-style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000;"><div><div id="zimbraEditorContainer" style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000;" class="2" data-mce-style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000;"><div><div style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;"><strong><b><span lang="HR" style="font-size: 16pt; color: black;" data-mce-style="font-size: 16pt; color: black;"><img><img src="cid:fb559ca8379da07816ebeb024a88bd13dae62179@zimbra" data-mce-src="cid:fb559ca8379da07816ebeb024a88bd13dae62179@zimbra"></span></b></strong></div><div style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;"><p style="text-align: center; margin: 0px;" align="center" data-mce-style="text-align: center; margin: 0px;"><b><span lang="EN-GB" style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;" data-mce-style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;">Institut za fiziku, Bijenička cesta 46,</span></b></p><p style="text-align: center; margin: 0px;" align="center" data-mce-style="text-align: center; margin: 0px;"><b><span lang="EN-GB" style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;" data-mce-style="font-family: 'Century Gothic',sans-serif; color: #5f5f5f;">predavaonica u zgradi Mladen Paić</span></b></p><strong><b><span lang="EN-GB" style="font-size: 14pt; font-family: 'Century Gothic',sans-serif; color: #993300;" data-mce-style="font-size: 14pt; font-family: 'Century Gothic',sans-serif; color: #993300;">utorak, 25. rujna 2018., u 15:00 sati</span></b><br></strong></div><div style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;"><strong></strong> </div><div style="text-align: center;" data-mce-style="text-align: center;"><span style="color: #55913c; font-family: 'Times New Roman', serif;" data-mce-style="color: #55913c; font-family: 'Times New Roman', serif;"><span style="font-size: 21.3333px;" data-mce-style="font-size: 21.3333px;"><b>Laser-Matter Interaction in Dielectrics: Insights from Pulsed Second-Harmonic Generation in Periodically Poled LiTaO<sub>3</sub></b></span></span></div><div style="text-align: center;" data-mce-style="text-align: center;"><span style="font-family: 'Century Gothic', sans-serif;" data-mce-style="font-family: 'Century Gothic', sans-serif;"><span style="font-size: 18.6667px;" data-mce-style="font-size: 18.6667px;"><b>dr. </b></span></span><span style="font-family: 'Century Gothic', sans-serif;" data-mce-style="font-family: 'Century Gothic', sans-serif;"><span style="font-size: 18.6667px;" data-mce-style="font-size: 18.6667px;"><b>Oleg A. Louchev</b></span></span></div><div style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;"><b></b> </div><div style="text-align: center;" data-mce-style="text-align: center;"><span style="font-family: 'Century Gothic', sans-serif;" data-mce-style="font-family: 'Century Gothic', sans-serif;"><span style="font-size: 14.6667px;" data-mce-style="font-size: 14.6667px;"><b>RIKEN Center for Advanced Photonics, Wako, Saitama, Japan</b></span></span></div><div style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; text-align: center;"><span style="font-size: small; font-family: Arial;" data-mce-style="font-size: small; font-family: Arial;"></span><br> </div><p style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; margin: 15px; text-align: justify;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; margin: 15px; text-align: justify;"><span style="font-family: arial, helvetica, sans-serif;" data-mce-style="font-family: arial, helvetica, sans-serif;">This presentation focuses on theoretical and experimental studies of laser second harmonic generation (SHG) in periodically-poled crystals in the range from ns to ps pulse duration. High-intensity and high-efficient SHG operation is inhibited by many side effects associated with dephasing of the involved lased waves caused by generation of non-uniform temperature distributions and plasma generation along the beam propagation. Generation of free electrons by generated second harmonic and accelerated to a high energy by generated pyro-electric field is shown to be able to produce high-density defects and damage in the rear side of the operating crystals. Temperature-controlled experimental study of high-intensity high- frequency ps SHG allowed to find the temperature effect of a single ps pulse. The detailed analysis of the plasma generation kinetics and related recombination pathways related to this experiment allowed to suggest a new modification of the non-equilibrium two-temperature model of short-pulsed laser-matter interaction leading to an excellent agreement with the experiment. This modification is valid for a wide range of laser-matter interactions and related application for operation and processing of dielectric materials for electron density below 10<sup>21</sup> cm<sup>-3</sup>. Finally, we suggest a new scaling estimate for the characteristic time of electron-lattice energy transfer time agreeing well with experimental data for a wide range of materials.</span></p><p style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; margin: 0px;" data-mce-style="color: #000000; font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; margin: 0px;"><b style="font-size: 12pt;" data-mce-style="font-size: 12pt;"><span lang="EN-GB" style="font-size: 12pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 12pt; font-family: 'Century Gothic',sans-serif;"><b><span lang="EN-GB" style="font-size: 11pt;" data-mce-style="font-size: 11pt;"> </span></b></span></b><span style="font-family: arial, helvetica, sans-serif;" data-mce-style="font-family: arial, helvetica, sans-serif;"></span></p></div><div style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt; text-align: left;" data-mce-style="color: #000000; font-family: arial, helvetica, sans-serif; font-size: 12pt; text-align: left;"><b><span lang="EN-GB" style="font-size: 12pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 12pt; font-family: 'Century Gothic',sans-serif;"><b><span lang="EN-GB" style="font-size: 11pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 11pt; font-family: 'Century Gothic',sans-serif;"> </span></b></span></b><b><span lang="EN-GB" style="font-size: 12pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 12pt; font-family: 'Century Gothic',sans-serif;"><b><span lang="EN-GB" style="font-size: 11pt; font-family: 'Century Gothic',sans-serif;" data-mce-style="font-size: 11pt; font-family: 'Century Gothic',sans-serif;">Voditelji seminara IF-a: <a href="mailto:hrvoje@ifs.hr" target="_blank">Hrvoje Skenderović</a> i <a href="mailto:damirs@ifs.hr" target="_blank">Damir Starešinić</a></span></b></span></b></div></div></div></div><br></div></div></body></html>