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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1988),
  • paper THA2

Short-pulse intracavity Raman laser

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Abstract

We discuss the physics and design of a new class of tunable variable duration, short-pulse laser. Figure 1 shows a unidirectional ring laser containing a medium with gain at the fundamental frequency and a (nearly) copropagating unidirectional ring laser for the Stokes shifted Raman frequency with intersection of the beams in the Raman gain medium common to both rings. The laser cavity lengths are adjusted to differ by the amount Δ/so that the cavity round trip times differ by the desired output pulse duration (i.e., Δl= cτout). A fundamental pulse and a small Raman seed pulse are injected Into the pump and Stokes cavities, respectively. One pulse Is delayed relative to the other so they overlap during successive trips through the cavities. When the fundamental pulse overlaps the seed Raman pulse in the Raman medium, the fundamental pulse is converted into Stokes light via stimulated Raman scattering. Gain at the Stokes frequency occurs only during the overlap of the fundamental and Stokes pulses; this occurs for a time duration Δl/c. The Stokes pulse is partially outcoupled via the partially reflecting mirror which serves as the output coupler. However, some significant fraction of the pulse remains within its cavity. On successive round trip passes through the cavities, more and more of the fundamental pulse is converted to Stokes light, and the fundamental pulse becomes successively narrower as it is consumed. Consumption of the fundamental takes place from either its leading or trailing edge depending on the initial pulse delay and cavity lengths. For efficient conversion to take place during the overlap of the pump and Stokes pulses inside the Raman medium, it is desirable that the response time of the Raman medium (the T2 time of the polarization at the Stokes frequency) be small compared with the overlap time Δl/c. Otherwise the Raman conversion efficiency may not be sufficient to consume the fundamental during the overlap with the seed Stokes pulse.

© 1988 Optical Society of America

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