Abstract
We study the temporal coherence properties of a Nd:YAG pumped Raman shifter (pump wavelength=355 nm) and report the control of its temporal coherence length z c with hydrogen gas pressure P for different input pump energies E in. Within the range: 3.1⩽ E in⩽6.5 mJ, and for: 0.41⩽ P⩽4.83 MPa, z c exhibits an inverse hump-like dependence with P. The shortest z c occurs near a (critical) pressure P= P c≈0.69 MPa, that is independent of E in. At P= P c, the eight Stokes and anti-Stokes lines exist at their strongest in the Raman output spectrum. For P< P c, a sharp increase in z c is obtained with decreasing P due to the relative dominance of the 355 nm Rayleigh line in output spectrum. For P> P c, a slow increase in z c is observed with P due to the dominance of the second-order Stokes line and the weakening of the anti-Stokes lines that is caused by the deterioration of the phase-matching condition for four-wave mixing.
Published Version
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