Numerical Investigation and Prediction of Simultaneous Pulse-shaping and Mode-locking of Semiconductor Lasers

Numerical investigations based on a modified multimode laser rate equation model are reported that incorporate both active mode-locking and shaping of ultra-short optical pulses by linear Fourier-optical spectral filtering. At first glance, mode-locking and pulse-shaping seem to exclude each other, since mode-locking requires many longitudinal (axial) modes while pulse-shaping by linear-optical spectral filtering means suppression of many modes or even mode groups. Our results show that both features are possible simultaneously (even in the case with both an amplitude and a phase filter) due to the fact that energy transfer between suppressed modes, on the basis of spontaneous emission, can be strong enough for stable mode-locking. These findings suggest that the usually high signal loss for external pulse-shaping of semiconductor laser pulses can be circumvented by use of a pulse-shaping set-up internal to the mode-locking resonator; in this case only modes useful for pulse-shaping survive competition for inversion.

[1]  Mohammd Mohebbi,et al.  Compression of Femtosecond Optical Pulses Using Hollow-Core Fibers , 2004 .

[2]  H. Fouckhardt,et al.  Technology and realization of metallic curved waveguide mirrors in polymer film waveguides based on anisotropic plasma etching , 2001 .

[3]  K R Wilson,et al.  Effect of pulse shape on the efficiency of multiphoton processes: implications for biological microscopy. , 1999, Journal of biomedical optics.

[4]  H. Fouckhardt,et al.  Microoptical and integrated optical fs/ps pulse shapers. , 1999, Optics express.

[5]  Andrew M. Weiner,et al.  Femtosecond pulse shaping for synthesis, processing, and time-to-space conversion of ultrafast optical waveforms , 1998 .

[6]  K. M. Mahoney,et al.  A femtosecond pulse-shaping apparatus containing microlens arrays for use with pixellated spatial light modulators , 1996 .

[7]  P. Emplit,et al.  Passive amplitude and phase picosecond pulse shaping. , 1992, Optics letters.

[8]  Andrew M. Weiner,et al.  Programmable shaping of femtosecond optical pulses by use of 128-element liquid crystal phase modulator , 1992 .

[9]  Yaron Silberberg,et al.  Use of femtosecond square pulses to avoid pulse breakup in all-optical switching , 1989 .

[10]  Andrew M. Weiner,et al.  High-resolution femtosecond pulse shaping , 1988 .

[11]  J P Heritage,et al.  Encoding and decoding of femtosecond pulses. , 1988, Optics letters.

[12]  J P Heritage,et al.  Picosecond pulse shaping by spectral phase and amplitude manipulation. , 1985, Optics letters.

[13]  C.-C. Chang,et al.  Code-division multiple-access encoding and decoding of femtosecond optical pulses over a 2.5-km fiber link , 1998, IEEE Photonics Technology Letters.

[14]  D. Bucknall,et al.  Control of Chemical Reactions by Feedback-Optimized Phase-Shaped Femtosecond Laser Pulses , 1998 .