Nonlinear absorption of laser light in Bi12GeO20 single crystals

Influence of femtosecond pulsed laser irradiation on bismuth germanium oxide single crystal properties

“…The repetition rate of 90 fs long laser pulses was 76 MHz. The total irradiation time and energy were intentionally kept low to avoid significant contribution of an accumulative process caused by repopulation of the traps [28]. The Ophir powermeter with thermal and photometric heads was used to perform beam power measurements.…”

“…The properties of non-doped as well as doped Bi 12 GeO 20 were investigated and reported in a number of studies, for example in [13][14][15][16][17][18][19][20][21]. Characteristics of Bi 12 GeO 20 single crystals after exposure to thermal treatment [16][17][18][19]22], to beams of electrons [23], uranium ions [24], fluorine ions [15], g-ray [19] or light [9,18,22,[25][26][27][28] were investigated. Nonlinear properties of Bi 12 GeO 20 crystals were measured with pulsed laser beams in the nanosecond range in [9], whereas in [26][27][28] BGO crystals were irradiated by picosecond laser pulses.…”

“…Characteristics of Bi 12 GeO 20 single crystals after exposure to thermal treatment [16][17][18][19]22], to beams of electrons [23], uranium ions [24], fluorine ions [15], g-ray [19] or light [9,18,22,[25][26][27][28] were investigated. Nonlinear properties of Bi 12 GeO 20 crystals were measured with pulsed laser beams in the nanosecond range in [9], whereas in [26][27][28] BGO crystals were irradiated by picosecond laser pulses. Transmission, absorption [16,19], and Raman spectra [19] were found to be significantly influenced by doping and annealing.…”

Nonlinear optical properties of BSO nanoparticles dispersed in PMMA matrix

“…This characteristic crystalline structure of sillenite single crystals was exploited by doping appropriate metal ions that enhanced nonlinear optical properties [8]. Nonlinear optical properties like nonlinear absorption, refraction and their application towards optical limiting applications were investigated in sillenite family of crystals over the visible and infrared ranges suggesting that in sillenites nonlinear absorption plays a significant role due to the carrier generation process induced by short laser pulses [9][10][11]. Though the bulk single crystals have significant nonlinear optical properties, their major drawback is the growth process leading to the defects eventually introducing the trap states between the valence and the conduction band modifying the energy band structure significantly [12], in turn slowing down their optical response.…”