Optical nonlinearities of glass doped with PbS nanocrystals

Nonlinear absorption of glass doped with PbS nanocrystals is studied and application of this composite material as a saturable absorber for mode locking in lasers is discussed. By using time resolved absorption pump-probe investigation, bleaching due to filling of discrete states caused by quantum confinement in the nanocrystals as well as induced absorption are revealed and characterized. The origin of the induced absorption is discussed. Kinetics of the transient absorption is studied. Two components observed in the decay of the nonlinearities are observed and interpreted in terms of the carrier trapping.

[1]  K. I. Kang,et al.  Room temperature spectral hole burning and elimination of photodarkening in sol‐gel derived CdS quantum dots , 1994 .

[2]  P. Roussignol,et al.  New results on optical phase conjugation in semiconductor-doped glasses , 1987 .

[3]  G. Tamulaitis,et al.  Dynamics of dense exciton gas in semiconductor nanocrystals , 1997 .

[4]  K. Rustagi,et al.  Optical nonlinearities in semiconductor-doped glasses. , 1984, Optics letters.

[5]  Fritz Henneberger,et al.  Exciton-related optical nonlinearities in semiconductors and semiconductor microcrystallites , 1988 .

[6]  Ghassan E. Jabbour,et al.  PbS quantum-dot doped glasses as saturable absorbers for mode locking of a Cr:forsterite laser , 1997 .

[7]  M. Artemyev,et al.  Optical transient induced absorption in ultrasmall particles of amorphous selenium , 1996 .

[8]  R. Baltramiejūnas,et al.  Transient effects in photoexcited CdS microcrystals , 1992 .

[9]  M. G. Ivanov,et al.  Auger ionization of semiconductor quantum drops in a glass matrix , 1990 .

[10]  M. Artemyev,et al.  Picosecond absorption spectroscopy of surface modified copper sulfide nanocrystals in polymeric film , 1996 .

[11]  Goto,et al.  Subpicosecond spectroscopy of the optical nonlinearities of CuCl quantum dots. , 1995, Physical review. B, Condensed matter.

[12]  Ying Wang,et al.  PbS in polymers. From molecules to bulk solids , 1987 .

[13]  J. Cunningham,et al.  Low-loss intracavity AlAs/AlGaAs saturable Bragg reflector for femtosecond mode locking in solid-state lasers. , 1995, Optics letters.

[14]  M. Joffre,et al.  Femtosecond optical nonlinearities of CdSe quantum dots , 1989 .

[15]  Norris,et al.  Measurement of the size dependent hole spectrum in CdSe quantum dots. , 1994, Physical review letters.

[16]  Excitonic optical nonlinearity in quantum‐confined CuCl‐doped borosilicate glass , 1990 .

[17]  N. Peyghambarian,et al.  PbS quantum-dot-doped glasses for ultrashort-pulse generation , 2000 .

[18]  A. I. Ekimov,et al.  Quantum size effect in semiconductor microcrystals , 1985 .

[19]  Nasser N Peyghambarian,et al.  Self-starting mode-locked Cr:forsterite laser with semiconductor saturable Bragg reflector , 1997 .

[20]  M. Rosen,et al.  Auger relaxation processes in semiconductor nanocrystals and quantum wells , 1996 .

[21]  David A. B. Miller,et al.  Theory of the linear and nonlinear optical properties of semiconductor microcrystallites. , 1987, Physical review. B, Condensed matter.

[22]  U. Keller,et al.  Broadly tunable femtosecond Cr:LiSAF laser. , 1997, Optics letters.

[23]  N. Ernsting,et al.  COLLOIDAL ZN1-XCDXS - OPTICAL SATURATION OF THE EXCITON BAND AND PRIMARY PHOTOCHEMISTRY STUDIED BY SUBPICOSECOND LASER FLASH-PHOTOLYSIS , 1990 .