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Raman Shifter

Raman Shifter RS

Raman Shifter RS

Product description:

    The Raman shifters are used for downshifting the laser radiation frequency in order to generate powerful IR femtosecond pulses. 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 hexauoride) and barium nitrate crystal are used as active media. The Raman frequency shift varies from 775 cm-1 for sulphur hexauoride to 4155 cm-1 for hydrogen.The energy conversion eciency reaches 30%. The using small volume Raman cells (less than 100 cm3) provides the safety operation. The optical scheme and sizes of Raman lasers depend on the 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 RS-800, RS-1050 and RS-1250 (800 nm,1050 nm and 1250 nm respectively). Customized enquiries are welcome.
• Conversion efficiency up to 30%
• Various active media with different frequency shift values
• Input pulse energies up to 100 mJ
• Standard models for 800, 1058 and 1250 nm
Wavelength after conversion of dierent sources in various active media
RS
         Active medium Hydrogen
(gas)
Methane and
deuterium
(gas)
Barium nitrate
(crystal)
Yb:KYW (1058 nm)RS-1050 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

Pulse shape of the Ti:Sapphire laser pulse with duration of 48 fs at the wavelength of 800 nm (purple curve) and converted to rst Stokes with duration of 52 fs at the wavelength of 1200 nm by stimulated Raman scattering in hydrogen conned in the capillary.

Raman Shifter