High power room temperature 10148 nm Yb fiber amplifier and frequency quadrupling to 2537 nm for laser cooling of mercury atoms

0103 physical sciences 7. Clean energy 01 natural sciences
DOI: 10.1364/oe.21.030958 Publication Date: 2013-12-09T18:15:52Z
ABSTRACT
An 8 W continuous wave linearly-polarized single-frequency 1014.8 nm fiber amplifier working at room temperature is developed with commercial double-clad single-mode Yb-doped silica fiber. Re-absorption at the laser wavelength and amplified spontaneous emission at longer wavelength are managed by optimizing the amplifier design. The laser has a linewidth of ~24 kHz without noticeable broadening after amplification. Using two resonant cavity frequency doublers, 1.03 W laser at 507.4 nm and 75 mW laser at 253.7 nm are generated with 4 W 1014.8 nm laser. Both absorption and saturated absorption spectra of the (1)S(0) - (3)P(1) transition of atomic mercury are measured with the 253.7 nm laser.
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