Squeezed Coherent States in Double Optical Resonance

In this work, we consider a “Λ-type” three-level system where the first transition is driven by a radiation field initially prepared in a squeezed coherent state, while the second one by a weak probe field. If the squeezed field is sufficiently strong to cause Stark splitting of the states it connects, such a splitting can be monitored through the population of the probe state, a scheme also known as “double optical resonance”. Our results deviate from the well-studied case of coherent driving indicating that the splitting profile shows great sensitivity to the value of the squeezing parameter, as well as its phase difference from the complex displacement parameter. The theory is cast in terms of the resolvent operator where both the atom and the radiation field are treated quantum mechanically, while the effects of squeezing are obtained by appropriate averaging over the photon number distribution of the squeezed coherent state.

Спектрально-люминесцентные свойства Yb-=SUP=-3+-=/SUP=- в растворах SO-=SUB=-2-=/SUB=-Cl-=SUB=-2-=/SUB=--GaCl-=SUB=-3-=/SUB=--Yb-=SUP=-3+-=/SUP=-

The spectra of absorption, luminescence, and lifetime of Yb3+ in SO2Cl2 – GaCl3 – Yb3+ solutions were measured. Information is obtained on the Stark splitting of energy levels, absorption and stimulated emission cross sections of Yb3+. An analysis of the spectral dependence of the gain cross sections indicates that the SOCl2 – GaCl3 – Yb3 solution is promising as the active medium of a diode-pumped liquid ytterbium laser.

Спектрально-люминесцентные свойства Yb-=SUP=-3+-=/SUP=- в SOCl-=SUB=-2-=/SUB=--GaCl-=SUB=-3-=/SUB=-

The absorption, luminescence, and luminescent lifetimes of the excited state of Yb3+ in SOCl2 – GaCl3 – Yb3+ solutions were measured. Information was obtained on the Stark splitting of energy levels, absorption cross sections, and stimulated emission of Yb3+ in SOCl2 – GaCl3 – Yb3+. The possibility of creating a ytterbium laser based on inorganic liquid SOCl2 – GaCl3 – Yb3+ with diode pumping was considered.

Boosting the branching ratio at 900 nm in Nd3+ doped germanophosphate glasses by crystal field strength and structural engineering for efficient blue fiber lasers

Fine tuning of Stark splitting and the dispersed state of Nd3+ to boost the fluorescence branching ratio and emission intensity of the 4F3/2 → 4I9/2 transition.