New CW far-infrared lasing in&amp;lt;sup&amp;gt;14&amp;lt;/sup&amp;gt;NH&amp;lt;inf&amp;gt;3&amp;lt;/inf&amp;gt;using Stark tuning

Redon, M.; Gastaud, C.; Fourrier, M.

doi:10.1109/jqe.1979.1070037

Cited by 22 publications

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“…To do this, we must find the optimal values of the confocal parameters of the pump radiation and the emission of the 1st Stokes component. From expression (5) it follows that the highest gains correspond to the waists of the pump and 1st Stokes component positioned at the center of the Raman-active medium. It is specifically this case that was studied theoretically in [3,4], where it is shown that a decrease in the confocal parameter of the 1st Stokes component leads to a decrease in the threshold power.…”

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“…Therefore it is most advisable to use cavities with a confocal parameter that is 2-3 times smaller than the length of the medium. Note that for each ratio of the length of the medium to the confocal parameter of the cavity, there is an optimal ratio between the confocal parameters of the pump beam and the cavity, which is determined numerically from expression (5).…”

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“…The cavity lengths and radii of curvature of the mirrors provided confocal parameters of the cavity equal to 1.86 cm for mirrors OC1 and OC2, 3.28 cm for the mirror OC3. Thus the confocal parameter for all the cavities is much shorter than the length of the Raman-active crystal, which as shown by analysis of expression (5), is needed to reduce the threshold energy.…”

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Low-threshold lasing in stimulated Raman lasers with nanosecond pumping

et al. 2008

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We have studied the conditions resulting in maximum lowering of the excitation threshold for pulsed stimulated Raman (SRS) lasers. It has been shown theoretically that in order to achieve the lowest possible values of laser radiation pulse energy needed to excite lasing in SRS lasers, we need high reflection of the cavity mirrors and low losses at the wavelength of the 1st Stokes component, high reflection of the output mirror at the wavelength of the pump radiation, and also matching of the confocal parameters for the exciting laser radiation and the cavity with each other and with the length of the Raman-active medium. The experimentally achieved excitation threshold for an SRS laser based on a barium nitrate crystal was 6 µJ, which quantitatively corresponds well to the calculation results. Lasing of up to five Stokes components simultaneously occurred. The efficiency for conversion of the laser radiation to one component was as high as 39%.Introduction. Stimulated Raman scattering (SRS) is a well known nonlinear optical process. It is used most widely for conversion of the frequency of laser radiation to the long-wavelength region of the spectrum, which makes it possible to design new laser radiation sources based on SRS for regions of the spectrum where using conventional laser output is impossible or very difficult.Under usual conditions for SRS lasing, high-power laser radiation is required. In fact, in order to achieve threshold for SRS lasing (conversion efficiency ≈1%) for a single pass of the exciting laser radiation through a Raman-active medium with SRS gain g and length L cr , the intensity of the laser radiation should be [1]

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