Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 27, Issue 6, Pages 646-649Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2015.2389631
Keywords
Erbium; femtosecond pulse; high repetition rate; solid-statelaser; optical pulses; optical waveguides; ytterbium
Funding
- EPSRC [EP/J008052/1]
- Engineering and Physical Sciences Research Council [EP/J008052/1] Funding Source: researchfish
- EPSRC [EP/J008052/1] Funding Source: UKRI
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In this letter, we present the use of monolayer graphene saturable absorbers to produce Q-switched and Q-switched mode-locked operation of Yb and Yb: Er-doped phosphate glass waveguide lasers, respectively. For the 1535-nm-wavelength Yb: Er laser, the Q-switched pulses have repetition rates up to 526 kHz and contain mode-locked pulses at a repetition frequency of 6.8 GHz. The measured 0.44-nm bandwidth should allow pulses as short as similar to 6 ps to be generated. Maximum average output powers of 27 mW are obtained at a slope efficiency of 5% in this mode of operation. For the 1057-nm-wavelength Yb laser, Q-switched pulses are obtained with a repetition rate of up to 833 kHz and a maximum average output power of 21 mW. The pulse duration is found to decrease from 292 to 140 ns and the pulse energy increase from 17 to 27 nJ as the incident pump power increases from 220 to 652 mW.
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