Biography
Biography: Nasser Peyghambarian
Abstract
Phosphate, telluride and fl uoride glasses allow new fi ber laser frequencies. Nonlinear eff ects including Second Harmonic Generation (SHG), Optical Parametric Oscillators (OPO), Stimulated Raman Scattering (SRS) and Stimulated Brillouin Scattering (SBS) extend the operating wavelengths. However, some nonlinear eff ects including SRS in some cases are not desirable as they prevent high power operation. Our recent advances include: Demonstration of blue laser using Tm-doped fl uoride glass; Demonstration of midinfrared (mid-IR) frequency comb spanning from 7.5-11.6 μm using diff erence frequency generation (DFG) in a AgGaS2 crystal with a compact all-fi ber source based on Tm and Er-amplifi ers. Th e power of the mid-IR signal is measured to be 1.55mW and the photon conversion effi ciency is 15%. Th e pulse duration achieved in the mid-IR range is estimated to be around 80fs, which corresponds to 2.6 optical cycles at 9.2 μm center wavelength. Th e current approach allows simple power scaling by further amplifi cation of the pump and signal pulses using established amplifi er technologies. Demonstration of Er3+-doped ZBLAN fi ber amplifi er for Q-switched pulses at 2.79 μm is reported. Over 24 μJ pulse energy at an average output power of 1.0 W was achieved at a pump power of 9.4 W. The effi ciency of this pulsed laser fi ber amplifi er is about 10%. Our simulation predicts that over 250 μJ pulses can be achieved with this fi ber amplifi er when a 120 W pump is used. Demonstration of mid-IR supercontinuum sources will also be discussed.