Generation of coherent anti‐Stokes rotational Raman radiation in hydrogen gas

Coherent anti‐Stokes rotational Raman scattering (CARS) has been observed for the J=3→5 rotational transition in hydrogen at a Raman frequency shift of 1033.4 cm−1. The pump wavelength of 532.1 nm was provided by a frequency‐doubled acousto‐optic Q‐switched cw krypton‐arc‐lamp‐pumped Nd:YAG laser, and the Stokes radiation at 563.1 nm was generated by a rhodamine 6G jet‐stream dye laser excited by the 532.1‐nm radiation. A comparison is made of the H2 rotational CARS signal with the vibrational CARS signal produced by the 995.4‐cm−1 ν2 vibrational mode of benzene.

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