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arXiv:1604.07619 · Applied Physics B

A tunable Doppler-free dichroic lock for laser frequency stabilization

Vivek Singh, V. B. Tiwari, S. R. Mishra, H. S. Rawat

Published Aug 1, 2016• 9 citations
arXivHTMLPDF
DOI
10.1007/s00340-016-6497-6

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We report on a frequency stabilized laser system with a variable linewidth at a wavelength of 404.7 nm used as an incoherent repump on the 6P30↔7S31 transition in mercury. By directly modulating the laser diode current with Gaussian white noise, the laser linewidth can be broadened up to 68 MHz. A Doppler-free dichroic atomic vapor laser lock spectroscopy provides an error signal suitable for frequency stabilization even for the broadened laser. Without the need of an acousto-optic modulator for the linewidth tuning or lock-in technique for frequency stabilization, this laser system provides an inexpensive approach for an incoherent and highly efficient repumper in atomic experiments.