Abstract
An ultrafast, passively mode-locked fiber laser oscillator has been realized using thulium-doped ZBLAN fibers. Very low dispersion of ZBLAN glass fibers enabled generation of pulses with broad spectra extending from 1730 nm to 2050 nm. Pulses are obtained with the average power of 13 mW at the repetition rate of 67.5 MHz when the pump power is 140 mW. The output pulses are compressed with a pair of SF10 prisms and their durations are measured with SHG FROG, from which we obtained the pulse duration as short as 45 fs.
Highlights
Mode-locked fiber lasers operating around 1 μm and 1.5 μm have been extensively studied over the past decades
Thulium-doped fiber lasers have attracted significant attention because they extend the operating wavelength toward 2 μm region, which will be useful for various fields such as medical applications [1], remote sensing [2], micromachining [3], high harmonic generation [4,5], and mid-infrared generation [6,7,8]
Dispersion compensation was attempted with several methods such as inserting a stretcher in the cavity [10,11] or using normal-dispersion fibers that compensate the dispersion of ordinary fibers [12, 13]
Summary
Mode-locked fiber lasers operating around 1 μm and 1.5 μm have been extensively studied over the past decades. Thulium-doped fiber lasers have attracted significant attention because they extend the operating wavelength toward 2 μm region, which will be useful for various fields such as medical applications [1], remote sensing [2], micromachining [3], high harmonic generation [4,5], and mid-infrared generation [6,7,8]. Broad emission spectra of thulium-doped fibers make them ideal candidates for ultrashort pulse sources in this wavelength region. The shortest pulses reported from thulium-doped fiber laser oscillator so far was 58 fs [14]. Another approach would be using fibers made of materials with less dispersion. The output pulses are compressed down to 45 fs, which are the shortest pulses generated directly from laser oscillators around this wavelength region to our knowledge
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