Engineering topics
Truong, Tran-Chau
Publications and source records attributed to Truong, Tran-Chau.
Thermal effects in molecular gas-filled hollow-core fibers
Few-cycle sources with high average powers are required for applications to attosecond science. Raman-enhanced spectral broadening of Yb-doped laser amplifiers in molecular gases can yield few-cycle pulses, but thermal excitation of vibrational and rotational degrees of freedom may preclude high-power operation. Here we investigate changes in the spectral broadening associated with repetitive laser interactions in an N 2 O -filled hollow-core fiber. By comparing experimental measurements of the spectrum associated with each laser pulse to simulations based on a density matrix model, we find that losses in a spectral bandwidth and transmission are largely dominated by thermal excitation of the gas.
Multioctave supercontinuum generation and frequency conversion based on rotational nonlinearity
Molecular gases enable extreme compression of industrial-grade lasers, providing a more accessible platform for attosecond science.