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Graphene mode-locked femtosecond Cr:ZnSe laser at 2500 nm.
Cizmeciyan, M N,Kim, J W,Bae, S,Hong, B H,Rotermund, F,Sennaroglu, A Optical Society of America 2013 Optics letters Vol.38 No.3
<P>We report, for the first time to our knowledge, femtosecond pulse generation from a graphene mode-locked Cr:ZnSe laser at 2500 nm. To minimize the insertion losses at the lasing wavelength, high-quality monolayer graphene transferred on a CaF(2) substrate was used in the experiments. Once mode-locking was initiated, the laser generated a stable train of 226 fs pulses with a time-bandwidth product of 0.39. The mode-locked laser operated at a pulse repetition rate of 77 MHz and produced 80 mW output power with an incident pump power of 1.6 W. To our knowledge, this is the longest laser wavelength at which graphene-based passive mode-locking has been demonstrated to date.</P>
Energy scaling of a carbon nanotube saturable absorber mode-locked femtosecond bulk laser.
Baylam, I,Ozharar, S,Cankaya, H,Choi, S Y,Kim, K,Rotermund, F,Griebner, U,Petrov, V,Sennaroglu, A Optical Society of America 2012 Optics letters Vol.37 No.17
<P>We report successful energy scaling of a room-temperature femtosecond Cr4+: forsterite laser by using a single-walled carbon nanotube saturable absorber (SWCNT-SA). By incorporating a q-preserving multipass cavity, a repetition rate of 4.51 MHz was realized, and the oscillator produced 121 fs, 10 nJ pulses at 1247 nm, with an average output power of 46 mW. To the best of our knowledge, the peak power of 84 kW is the highest generated to date from a SWCNT-SA mode-locked oscillator. Furthermore, energy scaling of a femtosecond multipass-cavity laser, mode-locked using a SWCNT-SA, is demonstrated for the first time.</P>