RS. Raman Shifter of Laser Wavelength

Ultrafast Raman converters are designed to decrease the fundamental wavelength frequency of laser radiation in order to generate high-energy femtosecond pulses in the near- and mid-IR ranges.
Input source and corresponding Raman shifter model Active medium

Methane or deuterium

Barium nitrate

Ti:S (titanium-sapphire; 800 nm)
1200 nm

1050 nm

870 nm

Yb-doped systems (1030 nm)

1890 nm

1530 nm

1180 nm

Cr:F (chromium-forsterite; 1250 nm)
2600 nm

1970 nm

1430 nm

The RS Raman shifters are used for downshifting of laser radiation frequency in order to generate powerful IR femtosecond pulses. The RS femtosecond Raman shifters employ a novel scheme that is based on Raman conversion of a chirped laser pulse with subsequent pulse compression. Compressed gases (hydrogen, methane, sulphur hexafluoride) and barium nitrate crystals are used as active media in various models. Raman frequency shift varies from 775 cm-1 for sulphur hexafluoride to 4155 cm-1 for hydrogen, energy conversion efficiency reaches 30%. Usage of small-volume Raman cells (less than 100 cm3) insures safe operation. The optical scheme and size of the Raman lasers depend on pump laser pulse energy which can vary from 0.1 mJ to 100 mJ.

The RS Raman shifter family includes three standard models for traditional sources: the RS-800, the RS-1030 and the RS-1250 (800 nm, 1030 nm and 1250 nm respectively). Customized enquiries are welcome.


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