Stimulated Raman Scattering in the Anti-Stokes Region

V. N. Lugovoǐ

Valery S. Butylkin, V. G. Venkin, V.P. Protasov +3 more

Suren Sogomonian, L. Niggl, Max Maier

J. C. White

Up-conversion schemes for various excimer laser systems based upon anti-Stokes Raman laser action are proposed. Four atomic systems, TI, In, I, and Br, are considered as host media for the Raman laser up-converter. Gain calculations indicate that anti-Stokes Raman up-converters should permit a variety of new tunable laser sources in the 150-325 nm spectral region.

Anatoliy I. Ivanisik, V. I. Malyi, G. V. Ponezha

Carsten Cleff, Petra Groß, Carsten Fallnich +6 more

We present a theoretical investigation of stimulated emission pumping to achieve sub-diffraction-limited spatial resolution in coherent anti-Stokes Raman scattering (CARS) microscopy. A pair of control light fields is used to prepopulate the Raman state involved in the CARS process prior to the CARS signal generation. Efficient prepopulation is achieved by employing a path via an electronic or vibrational state. Thereby, the buildup of a coherence between the ground and Raman state during irradiation by the light fields for CARS signal generation is prevented, resulting in the suppression of the CARS intensity by more than 99.8$%$. Two-dimensional spatial excitation profiles have been calculated using donut-shaped spatial profiles for the control light fields, thus, an intensity-dependent narrowing of the CARS excitation profiles below the diffraction limit. Using computer-generated test images we demonstrate a resolution beyond the diffraction limit for CARS microscopy, which is scalable by the control light field intensity, similar to stimulated emission depletion microscopy.