Third-order nonlinear susceptibilities of dye solutions determined by third-harmonic generation

Leupacher, W.; Penzkofer, Alfons

doi:10.1007/bf00698033

Cited by 34 publications

(14 citation statements)

References 18 publications

(44 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nonlinear susceptibility x^ of the gases may be expressed in terms of the nonlinear hyperpolarizability T(3) by [7] = eü l NLWy ( $n(-"3> "l> = 0V 0 pr 0 LW/e 0 p 0 7>^1 1 (-co 3 ; coj, co lf c^), n 0 is the refractive index at standard conditions (p 0 = 1 atm, T 0 = 273.15 K). Its value is determined by dispersion formulas [21,22].…”

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

Nonresonant third order hyperpolarizability of rare gases and N2 determined by third harmonic generation

Lehmeier¹,

Leupacher²,

Penzkofer³

1985

Optics Communications

Self Cite

208

View full text Add to dashboard Cite

show abstract

Section: Theorymentioning

confidence: 99%

“…The problem of third harmonic generation along the light path outside the sample is avoided by putting the gas cells into a vacuum chamber behind the focal region of the slightly focused laser beam and using cell windows of thickness equal to an even integer of the coherence length ir/Ak of the interaction [4,7] (Maker fringe minima [8]). …”

Section: Introductionmentioning

confidence: 99%

Nonresonant third order hyperpolarizability of rare gases and N2 determined by third harmonic generation

Lehmeier¹,

Leupacher²,

Penzkofer³

1985

Optics Communications

Self Cite

208

View full text Add to dashboard Cite

show abstract

“…The absorption cross section at the second-harmonic wavelength A 2 = 527 nm is a 2 ~ 4.5 x 10 _19 cm 2 . The S 0 -S l transition is offresonant to the second-harmonic wavelength and therefore two-photon absorption does not influence third-harmonic generation [19,23,24]. The anomalous dispersion of the refractive index of the dye in the S x -absorption band allows phase-matching at a certain dye concentration.…”

Section: Dye and Solvent Characterizationmentioning

confidence: 99%

“…For HFIP the solvent third-harmonic nonlinear susceptibility XTHG s 1 S k nown from previous experiments. The dye's nonlinear susceptibility XTHG D * s thought to be negative because v 3 is above the electronic S 0 -S l transition frequency [23]. Under this assumption, XTHGD A T ^PM (8) and 7THG,D (10) of the dye PMC in HFIP are determined (see Table 1).…”

Section: Determination Of Third-harmonic Nonlinear Susceptibilitiesmentioning

confidence: 99%

“…The contribution of the spectral broadening Ai> SPM to the linear wavevector mismatch is 'dn 3 Ak SPM 67TZA (23) The reduction of the third-harmonic conversion efficiency by Ak SPM may be taken into account by replacing the sample length / by an interaction length For PMC in TFE at J 0L = 2.5 x 10 11 W/cm 2 it is Ai> SF^ 5.6 cm 1 and Ah SPM 1.8 cm-1 (dn 3 /V « 2.8 x 10" cm I' = min(Z,Z I ,3/^fc SPM ).…”

Section: Intensity-dependent Refractive Indicesmentioning

confidence: 99%

See 1 more Smart Citation

Phase-matched third-harmonic generation of Nd: Glass-laser picosecond pulses in a new cyanine-dye solution

et al. 1993

Self Cite

View full text Add to dashboard Cite

Abstract. The phase-matched direct tripling of picosecond light pulses of a mode-locked Nd: glass laser in a new cyanine dye PMC is studied. The solvents trifluoroethanol (TFE) and hexafluoroisopropanol (HFIP) are applied. The S Q -S l absorption peak of the dye is around A = 480 nm and the absorption cross section at the third-harmonic wavelength of A 3 = 351.3 nm is only a 3 « 1 x 10~1 9 cm 2 . Phase-matching occurred at concentrations of C PM = 0.0874 mol/dm 3 in HFIP and 0.1088 mol/dm 3 in TFE. A third-harmonic energy conversion efficiency of r] E « 0.01 was achieved at a pump-laser peak intensity of I 0L « 2.5 x 10 11 W/cm 2 in a 5 mm long sample of PMC in TFE. The conversion efficiency is limited by destruction of phase-matching due to the intensity-dependent nonlinear refractive index of the dye solutions. PACS: 42.65Efficient frequency tripling of laser radiation is performed generally in a two-step process first generating the secondharmonic light in a phase-matched nonlinear optical crystal and then frequency mixing the fundamental and the secondharmonic light in another phase-matched nonlinear optical crystal [1][2][3]. The second-order nonlinear optical susceptibility x ( 2 ) is responsible for these conversion processes. Direct (single-step) angle-tuned phase-matched third-harmonic generation of Nd:laser radiation was realized in the crystals LiI0 3 [4], CaC0 3 [5], and /3-BaB 2 0 4 [6]. In the vapor phase efficient phase-matched third-harmonic generation of Nd: laser radiation was achieved in mixtures of alkali vapors and noble gases [2,[7][8][9][10][11][12][13]. The direct third-harmonic generation is caused by the third-order nonlinear optical susceptibility x (3) .Phase-matched third-harmonic generation of Nd: laser radiation in organic dye solutions was studied in [14][15][16][17][18][19]. Dyes having the S 0 -S l absorption peak between the fundamental and third-harmonic frequency were selected for a low absorption cross section at the third-harmonic frequency. They were dissolved in a solvent of low normal refractive index dispersion. Phase-matching was achieved at a certain dye concentration at which the anomalous refractive index dispersion of the dyes compensated the normal refractive index dispersion of the solvents. For the dye PYC dissolved in hexafluoroisopropanol the absorption cross section at the third-harmonic frequency v 3 was cr 3 = 3.55 x 10~1 8 cm 2 , the two-photon absorption cross section was a^l = 1.8 x 10~4 9 cm 4 s and the excitedstate absorption cross section of third-harmonic light was a 3 e x = 2.6 x 10~1 6 cm 2 [18]. A maximum third-harmonic energy conversion efficiency of r] E = 2 x 10 -4 was achieved for input peak intensities J 0 L > 10 11 W/cm 2 (sample thickness I = 0.2 mm) [18]. The maximum obtainable conversion efficiency was limited by i) the small interaction length because of residual dye absorption at the third-harmonic frequency and ii) by two-photon dye absorption at twice the fundamental laser frequency and concomitant excited-state absorption of the dye....

show abstract

Optical Nonlinearities with Ultrashort Pulses

Laubereau¹

1988

Topics in Applied Physics

View full text Add to dashboard Cite

Third-order nonlinear susceptibilities of dye solutions determined by third-harmonic generation

Cited by 34 publications

References 18 publications

Nonresonant third order hyperpolarizability of rare gases and N2 determined by third harmonic generation

Nonresonant third order hyperpolarizability of rare gases and N2 determined by third harmonic generation

Phase-matched third-harmonic generation of Nd: Glass-laser picosecond pulses in a new cyanine-dye solution

Optical Nonlinearities with Ultrashort Pulses

Contact Info

Product

Resources

About