ABSTRACT
Multiwavelength lasing in the random distributed feedback fiber laser is demonstrated by employing an all fiber Lyot filter. Stable multiwavelength generation is obtained, with each line exhibiting sub-nanometer line-widths. A flat power distribution over multiple lines is obtained, which indicates that the power between lines is redistributed in nonlinear mixing processes. The multiwavelength generation is observed both in first and second Stokes waves.
ABSTRACT
The results of 11 extracorporeal partial nephrectomies for neoplasm with subsequent autologous transplantation of kidney are presented. In 4 patients, resection was performed ex vivo in the presence of a large centrally located tumor in a solitary kidney. Another two patients had bilateral tumor process. In 2 patients, a large, centrally located tumor in solitary kidney was the indication for extracorporeal resection. 3 patients had elective indications for the operation. Early postoperative complications occurred in 5 patients. 3 patients had oligoanuria. One patient developed postoperative bleeding; one patient developed obliteration of the upper third of ureter. Recurrence of renal cell cancer has not been identified; the functional state of the kidney vessels and vessels of upper urinary tract was regarded as satisfactory. Good results of these operations indicate the feasibility of expanding the indications for extracorporeal organ-sparing surgery.
Subject(s)
Carcinoma, Renal Cell/surgery , Kidney Neoplasms/surgery , Kidney Transplantation/methods , Nephrectomy/methods , Adult , Aged , Carcinoma, Renal Cell/diagnosis , Female , Humans , Kidney Neoplasms/diagnosis , Kidney Transplantation/adverse effects , Male , Middle Aged , Nephrectomy/adverse effects , Postoperative Complications/etiology , Transplantation, Autologous , Treatment OutcomeABSTRACT
We report on a 2085 nm holmium-doped silica fiber laser passively mode-locked by semiconductor saturable absorber mirror and carbon nanotube absorber. The laser, pumped by a 1.16 µm semiconductor disk laser, produces 890 femtosecond pulses with the average power of 46 mW and the repetition rate of 15.7 MHz.
ABSTRACT
We develop a theoretical framework for modeling of continuous wave Yb-doped fiber lasers with highly nonlinear cavity dynamics. The developed approach has shown good agreement between theoretical predictions and experimental results for particular scheme of Yb-doped laser with large spectral broadening during single round trip. The model is capable to accurately describe main features of the experimentally measured laser outputs such as power efficiency slope, power leakage through fibre Bragg gratings, spectral broadening and spectral shape of generated radiation.
Subject(s)
Fiber Optic Technology/instrumentation , Lasers , Models, Theoretical , Ytterbium/chemistry , Computer Simulation , Computer-Aided Design , Equipment Design , Nonlinear Dynamics , Reproducibility of ResultsABSTRACT
Three all-fiber Ho-doped lasers emitting in the range of 2050-2100 nm were fabricated. The lasers were pumped by an Yb-doped fiber laser at 1147 nm with a power up to 35 W. For all the lasers tested, the output power was found to be as high as 10 W, the efficiency slope being 30%.
ABSTRACT
We present what is believed to be the first experimental demonstration of a new mechanism of mode coupling in multicore fibers (MCFs) based on their indirect interaction inside the fiber via intermediate mode, analogous to the Bragg mode, which is very sensitive to bending of the fiber. Very strong coupling between the core modes regardless of large spacing (approximately 28 microm) between them has been demonstrated in the MCF laser as well as in the probe beam schemes. 70% of power conversion from one core to another with beating length of tens of centimeters in 4-core MCF is measured.
