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Nonlinear refractive indices of disordered NaT(XO4)(2) T=Y, La, Gd, Lu and Bi, X=Mo, W femtosecond laser crystals
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2008 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 91, no 3-4, 507-510 p.Article in journal (Refereed) Published
Abstract [en]

The nonlinear refractive index (n(2)) of several NaT(WO4)(2) (T = Y, La, Gd, Lu and Bi) and NaY(MoO4)(2) femtosecond laser crystals has been measured using the z-scan technique. These tetragonal crystals with structural local disorder present significant n(2) values, which should allow their efficient laser pulsed operation by Kerr-lens mode locking, especially NaBi(WO4)(2), 68x10(-16) cm(2)/W (for sigma light), which is about twice than for the others. This difference is attributed to the high polarizability associated with the lone electron pair of Bi3+.

Place, publisher, year, edition, pages
2008. Vol. 91, no 3-4, 507-510 p.
Keyword [en]
z-scan measurements, ti-sapphire laser, lens mode-locking, raman-scattering, local disorder, operation, spectroscopy, efficient, hosts, power
URN: urn:nbn:se:kth:diva-17568DOI: 10.1007/s00340-008-3041-3ISI: 000256251400019ScopusID: 2-s2.0-44449098647OAI: diva2:335612
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2012-03-30Bibliographically approved
In thesis
1. Nonlinear response in engineered optical materials
Open this publication in new window or tab >>Nonlinear response in engineered optical materials
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Material and structure engineering are increasingly employed in active optical media,in this context defined as media capable of providing laser or/and optical parametric gain. For laser materials, the main aim of the engineering is to tailor the absorption and emission cross sections in order to optimise the laser performance. At the same time, the engineering also results in a collateral modification of the material’s nonlinear response. In the first part of this work, the nonlinear index of refraction is characterised for two crystallographic forms of laser-ion doped and undoped double-tungstate crystals. These laser crystals have broad gain bandwidths, in particular when doped with Yb3+. As shown in this work, the crystals also have large Kerr nonlinearities, where the values vary significantly for different chemical compositions of the crystals. The combination of a broad gain bandwidthand a high Kerr nonlinearity makes the laser-ion doped double tungstates excellent candidates to employ for the generation of ultrashort laser pulses by Kerr-lens modelocking. The second part of the work relates to the applications of engineered second-order nonlinear media, which here in particular are periodically-poled KTiOPO4 crystals. Periodic structure engineering of second-order nonlinear crystals on a submicrometre scale opens up for the realisation of novel nonlinear devices. By the use of quasi-phase matching in these structures, it is possible to efficiently downconvert a pump wave into two counterpropagating parametric waves, which leads to a device called a mirrorless optical parametric oscillator. The nonlinear response in these engineered submicrometre structures is such that the parametric wave that propagates in the opposite direction of the pump automatically has a narrow bandwidth, whereas the parametric wave that propagates with the pump essentially is a frequency-shifted replica of the pump wave. The unusual spectral properties andthe tunabilities of mirrorless optical parametric oscillators are investigated.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xii, 98 p.
Trita-FYS, ISSN 0280-316X ; 2012:13
nonlinear optics, nonlinear index of refraction, double tungstates, periodic poling, KTiOPO4, quasi-phase matching, parametric down-conversion, mirrorless optical parametric oscillators
National Category
Atom and Molecular Physics and Optics
urn:nbn:se:kth:diva-92221 (URN)978-91-7501-295-7 (ISBN)
Public defence
2012-04-27, FD5, Albanova, Roslagstullsbacke 21, KTH, Stockholm, 10:00 (English)
QC 20120330Available from: 2012-03-30 Created: 2012-03-29 Last updated: 2012-03-30Bibliographically approved

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