Intracavity continuous-wave

Continuous-Wave Intracavity Dye Laser Spectroscopy Dependence of Enhancement on Pumping Power... 

Fig. 3. Diagram of continuous wave (cw) laser sources suitable for metalloprotein resonance Raman spectroscopy. The best quality spectra are provided by Ar, Kr, He-Ne, and He-Cd lasers operating at fixed frequencies (the lengths of the lines indicate the relative output for a given laser) throughout the visible and near-UV region. An intracavity frequency-doubled (ICFD) Ar laser has been developed with five useful cw excitation wavelengths in the far-UV region (257, 248, 244, 238, and 228.9 nm). The high-powered Ar and Kr lasers can also be used to pump dye lasers which are tunable between the near-UV and near-IR region. The cw Nd YAG laser with a fundamental at 1064 nm is the primary excitation source in FT Raman spectrometers.

Lupei V, Pavel N, Taira T (2003) Basic enhancement of the overall optical efficiency of intracavity frequency-doubling devices for the 1 pm continuous-wave Nd Y3AI5O12 laser emission. Appl Phys Lett 83 3653-3655... 

All the absorption techniques discussed thus far typically involve the measurement of a very small change in the total transmitted intensity of a light source through an absorbing medium this normally leads to a high background condition that limits sensitivity. State-of-the-art continuous wave (CW) absorption techniques, such as frequency modulation and intracavity methods (no further details provided here, but see Demtroder (2002) for example), can meet or exceed this sensitivity for static absorption measurements. However, they are commonly difficult to implement. 

W.P. Risk, W. Lenth Room temperature continuous wave 946 nm Nd YAG laser pumped by laser diode arrays and intracavity frequency doubling to 473 nm. Opt. Lett. 12, 993 (1987)... 

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