Broadband optical limiting based on excited state absorption in Pt:ethynyl

Staromlynska, J.; McKay, T. J.; Wilson, Peter

doi:10.1063/1.1303054

Cited by 85 publications

(81 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Population modelling is widely used to model the photophysical dynamics of chromophores [9,10,12,23,27,43]. The technique can basically be described as a numerical implementation of a Jablonsky diagram (figure 1.5), evolved stepwise with ∆t in [s].…”

Section: Population Modelsmentioning

confidence: 99%

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Lundén¹

2017

View full text Add to dashboard Cite

High power laser pulses can be a threat to sensors, including the human eye. Traditionally this threat has been alleviated by colour filters that blocks radiation in chosen wavelength ranges. Colour filters' main drawback is that they block radiation regardless of it being useful or damaging, information is removed for wavelengths at which the filter protect. Protecting the entire wavelength range of a sensor would block or strongly attenuate the radiation needed for the operation of the sensor.Sol-gel glasses highly doped with Pt-Acetylide chromophores have previously shown high optical quality in combination with efficient optical power limiting through reverse saturable absorption 1 . These filters will transmit visible light unless the light fluence is above a certain threshold. A key design consideration of laser protection filters is linear absorption in relation to threshold level. By increasing chromophore concentration the threshold is lowered at the expense of higher linear absorption. This means that the user's view is degraded through the filter.Adding small amounts of gold nanoparticles to the glasses resulted in an increase in optical power limiting performance. The optimal concentration of gold nanoparticles corresponded to a mean particle distance of several micrometers. The work in this licentiate thesis is about the characterization and explanation of this effect.The glasses investigated in this work were MTEOS Sol-Gel glasses doped with either only gold nanoparticles of varying shape and concentration, 50 mM of PE2-CH 2 OH codoped with gold nanoparticles or 50 mM of PE3-CH 2 OH codoped with gold nanoparticles. The glasses only doped with gold nanoparticles showed high optical power limiting performance at 532 nm laser wavelength, but no optical power limiting at the fluences tested at 600 nm. The PE2-CH 2 OH glasses codoped with gold nanoparticles showed an enhancement of optical power limiting at 600 nm for the low gold nanoparticle concentration glasses. The enhancement was weak-1 Standard nomenclature, see section 1.3.3.iii iv ened or not present for higher concentrations. A similar enhancement above noise level for the PE3-CH 2 OH glasses was not found.A population model is used to give a qualitative explanation of the findings. The improvement in optical power limiting performance for the PE2-CH 2 OH glasses is explained by the gold nanoparticles helping to more quickly populate the highly absorbing triplet state during the rising edge of the laser pulse by enhancing two-photon absorption. The lack of any marked enhancement for the PE3-CH 2 OH glasses is explained by the PE3-CH 2 OH chromophore already being of sufficiently high performance to quickly populate the highly absorbing triplet state during the rising edge of the laser pulse. Further work is necessary to validate this model against other chromophores and improving its quantitative predictive power. Populärvetenskaplig sammanfattningLaserpulser med hög effekt kan vara ett hot mot sensorer, inklusive människoögat. Traditi...

show abstract

Section: Population Modelsmentioning

confidence: 99%

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Lundén¹

2017

View full text Add to dashboard Cite

show abstract

“…Furthermore, organometallics usually present intersystem crossing to a triplet state, which can be assisted by 2PA [9]. In the class of organometallic compounds, platinum acetylide complexes have been attracting special attention as interesting candidates for applications [10,11]. These compounds present high conjugation length and a center with weak bound electrons, which may result in relatively high multi-photon cross-section [12,13].…”

Section: Introductionmentioning

confidence: 99%

Broadband three-photon absorption spectra of platinum acetylide complexes

Vivas

Piovesan

Silva

et al. 2011

Opt. Mater. Express

View full text Add to dashboard Cite

Abstract:We investigate the three-photon absorption spectra of four platinum acetylides complexes employing femtosecond pulses. We observed strong three-photon absorption cross-section in the near-infrared region (from 850 nm to 1200 nm). The three-photon absorption (3PA) spectra present resonance enhancement effect as two photons of the excitation wavelength approach the lower two-photon allowed states of the molecules as well as a 3PA allowed band around 1180 nm. The 3PA crosssection spectra were interpreted using the sum-over-essential-states approach, considering a three-energy-level diagram.

show abstract

“…This facilitates many applications of nanocomposite materials for the optical information storage, ultra-high speed communications, optical limitation of laser radiation, all-optical switching, etc. [9,16,17]. The appearance of nonlinear absorption, which can be used when synchronizing laser modes [18], represents another dominant property of the nanocomposite structures mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear optical parameters of borate glasses with Ag nanoparticles formed using reducing Gd3+ ions

Dutka¹,

Адамів²,

Bürak³

et al. 2015

Ukr. J. Phys. Opt.

View full text Add to dashboard Cite

Abstract. Basing on experimental absorption spectra and Z-scan spectra measured in the closed-and open-aperture regimes, we have calculated the nonlinear optical parameters (the refractive index n 2 , the absorption coefficient , and the third-order susceptibility  (3) ) of borate glasses (BGs) Li 2 B 4 O 7 -Gd 2 O 3 -Ag 2 O, CaB 4 O 7 -Gd 2 O 3 -Ag 2 O and LiCaBO 3 -Gd 2 O 3 -Ag 2 O that include Ag nanoparticles (NPs). The Ag NPs have been formed by annealing the glasses in the air atmosphere at the temperatures close to the glass-transition ones. We have proven that Gd 3+ represents an efficiently reducing ion in the BGs. We have also ascertained that the plasmon resonance caused by the presence of Ag NPs increases significantly the nonlinear optical parameters n 2 ,  and│ (3) │of the BGs.

show abstract

Broadband optical limiting based on excited state absorption in Pt:ethynyl

Cited by 85 publications

References 10 publications

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Sol-Gel Glasses Doped with Pt-Acetylides and Gold Nanoparticles for Enhanced Optical Power Limiting

Broadband three-photon absorption spectra of platinum acetylide complexes

Nonlinear optical parameters of borate glasses with Ag nanoparticles formed using reducing Gd3+ ions

Contact Info

Product

Resources

About