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

• DOI: 10.1364/oe.21.030958
• Publication Date: 2013-12-09T18:15:52Z
• Authors: Jinmeng Hu; Lei Zhang; Hongli Liu; Kangkang Liu; Zhen Xu; Yan Feng
• Keywords: 0103 physical sciences; 7. Clean energy; 01 natural sciences

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.