Self-mode-locking semiconductor disk laser

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Date

2014-11-7

Author

Gaafar, Mahmoud
Richter, Philipp
Keskin, Hakan
Möller, Christoph
Wichmann, Matthias
Stolz, Wolfgang
Rahimi-Iman, Arash
Koch, Martin

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The development of mode-locked semiconductor disk lasers received striking attention in the last 14 years and there is still a vast potential of such pulsed lasers to be explored and exploited. While for more than one decade pulsed operation was strongly linked to the employment of a saturable absorber, self-mode-locking emerged recently as an effective and novel technique in this field – giving prospect to a reduced complexity and improved cost-efficiency of such lasers. In this work, we highlight recent achievements regarding self-mode-locked semiconductor devices. It is worth to note, that although nonlinear effects in the active medium are expected to give rise to self-mode-locking, this has to be investigated with care in future experiments. However, there is a controversy whether results presented with respect to self-mode-locking truly show mode-locking. Such concerns are addressed in this work and we provide a clear evidence of mode-locking in a saturable-absorber-free device. By using a BBO crystal outside the cavity, green light originating from second-harmonic generation using the out-coupled laser beam is demonstrated. In addition, long-timespan pulse trains as well as radiofrequency-spectra measurements are presented for our sub-ps pulses at 500 MHz repetition rate which indicate the stable pulse operation of our device. Furthermore, a long-time-span autocorrelation trace is introduced which clearly shows absence of a pedestal or double pulses. Eventually, a beam-profile measurement reveals the excellent beam quality of our device with an M-square factor of less than 1.1 for both axes, showing that self-mode-locking can be achieved for the fundamental transverse mode.

Subject Keywords

ghz, Train, Operation, Integration, Ultrafast, Pulses, High-power, Surface-emitting laser, Pyrrolidine-thiourea, Recyclable organocatalysts, Bfunctional organocatalyst, Alpha,alpha-disubstituted aldehydes, Nitro-olefins, Silyl ether, Beta-nitrostyrenes, Chiral ionic liquids, Amine-thiourea catalyst, Enantioselective conjugate addition

URI

https://hdl.handle.net/11511/51274

Journal

Optics Express

DOI

https://doi.org/10.1364/oe.22.028390

Collections

Department of Physics, Article

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Citation Formats

M. Gaafar et al., “Self-mode-locking semiconductor disk laser,” Optics Express, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/51274.