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Non-Forward Stimulated Raman Scattering from a Phase-Modulated Pump Beam

Abstract: We present a new theory of non-forward stimulated Raman scattering in the field of a phase modulated pump, where the pump phase modulation is an arbitrary function of time. The theory is accurate enough to be determine the performance limitations on laser systems where SRS is a potentially controlling parasitic. Calculations are described for S:FAP amplifier media where the laser beam has a pure RF modulation typical of those attainable in the laboratory.  The predictions of this theory are compared with the oft-used D’yakov approximation. (Submitted for Publication - 2007))


The Phase Associated with Laser Gain, and the Kramers-Kronig Dispersion Relation

Abstract: We report a rigorous method of calculating the phase that laser gain imparts to a laser pulse as a result of passing through the laser gain medium. The method is based on the very fundamental principle of causality, and does not depend in any way on the mechanism by which gain is achieved nor on the distribution of excited states responsible for the gain. Thus for example, the phase associated with gain in a Nd:glass amplifier does not depend in any way on the distribution of ions or ion species. The only data required to determine the phase pulling associated with the existence of gain is the actual gain spectrum as a function of frequency. (Submitted for Publication - 2007)


Intradermally Focused Infrared Laser Pulses: Thermal Effects at Defined Tissue Depths (PDF)

Study Objective: To produce controlled, spatially confined thermal effects in dermis.
Conclusion:
Spatially confined foci of thermal effects can be achieved by focusing a low-power infrared laser into skin. Size, depth, and density of microscopic, thermal damage foci may be arbitrarily controlled while sparing surrounding tissue. This may offer a new approach for nonablative laser therapy of dermal disorders. (Lasers in Surgery and Medicine 9999:1–11 (2005))

 

 
 
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