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Raman shifters are used for downshifting the laser radiation frequency in order to generate powerful IR femtosecond pulses. Laser Support Services offers the RS range of Raman frequency shifters from Avesta.

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Avesta RS Raman Shifters

The RS femtosecond Raman shifters employ a novel scheme. The scheme is based on Raman conversion of a chirped laser pulse with subsequent pulse compression. Compressed gases (hydrogen, methane, sulphur hexafluoride) and barium nitrate crystal are used as active media. The Raman frequency shift varies from 775 cm-1 for sulphur hexafluoride to 4155 cm-1 for hydrogen.

Seed source
and shifter model
Active medium
Hydrogen 
(gas)

Methane or deuterium
(gases)

Barium nitrate 
(crystal)

Ti:S (800 nm)
RS-800
1200 nm

1050 nm

870 nm

Yb:KYW (1058 nm)
RS-1050

1890 nm

1530 nm

1180 nm

Cr:F (1250 nm)
RS-1250
2600 nm

1970 nm

1430 nm


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