Raman optical cavity

ROA Raman optical cavity RUF rigid urethane foam... 

Key words dental, oral cavity, cancer, microorganisms, materials characterization, enamel, caries, polarized Raman spectroscopy, optical coherence tomography, clinic, fibre optics... 

Optical multipass cells have been used for the enhancement of CW Raman scattering(4) however, these cells are typically not well-suited for use with high power, pulsed lasers. A new multipass cell for use with a pulsed Nd YAG laser is proposed whereby the 1.06 micron laser output is admitted into a multipass cell cavity where it is partially converted to 532nm with a Brewster s angle cut second harmonic generating crystal The 532nm pulse is trapped in the mirrored cavity while the 1.06 micron pulse is dumped. This multipass cell concept has been demonstrated with the experimental set-up shown in figure 1. 

The last line of Table 7.2 indicates the total optical output power for each ion laser, in terms of multiline visible power. However, this power is distributed among many wavelengths and is not useful directly for Raman spectroscopy. Multiline output is often used to pump dye lasers or titanium sapphire lasers, but these cases are fairly rare in analytical applications. Most often, a prism is added to the laser cavity to select one of the wavelengths listed in Table 7.2. As apparent in the table, Ar+ and Kr+ have a few strong lines that are popular for Raman (e.g., 488, 514.5, and 647.1 nm) plus several more at lower power. The mixed-gas Ar+/Kr+ laser provides less power but covers a wider range of visible wavelengths than Ar+ or Kr+ alone. 

Various schemes for hybrid quantum processors based on molecular ensembles as quantum memories and optical interfaces have been proposed. In Ref. [17], a hybrid quantum circuit using ensembles of cold polar molecules with solid-state quantum processors is discussed. As described above, the quantum memory is realized by collective spin states (ensemble qubit), which are coupled to a high-Q stripline cavity via microwave Raman processes. This proposal combines both molecular ensemble and stripline resonator ideas. A variant of this scheme using collective excitations of rotational and spin states of an ensemble of polar molecules prepared in a dipolar... 

Figure 9 Three-level atoms with dipole transitions 1,2>- 3) in the Lambda configuration. The dipole forbidden transition between two metastable states 1> and 2) are coupled to each other via microwave transition (a), or Raman transition (b), or two-photon transition (c) with effective half Rabi frequency Qo Another optical field is resonantly coupled to the dipole transition 2)- 3> with half Rabi frequency Qi. The two cavity fields 012 are amplified from Rabi sidebands on the dipole transition 1)- 3>.

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