Pure phase-modulation mode locking in semiconductor lasers

Area of Science:

• Optics and Photonics
• Semiconductor Lasers
• Nonlinear Optics

Background:

• Mode locking is crucial for generating ultrashort optical pulses.
• Semiconductor lasers offer compact and cost-effective solutions for various photonic applications.
• Extended-cavity designs enhance laser performance and tunability.

Purpose of the Study:

• To demonstrate pure phase-modulation mode locking in an extended-cavity semiconductor laser.
• To investigate the performance of a two-section optical amplifier for simultaneous gain and phase modulation.
• To explore a novel approach for generating ultrashort pulses from semiconductor lasers near 1.5 micrometers.

Main Methods:

• Utilized an extended-cavity semiconductor laser architecture.
• Employed a two-section optical amplifier integrated within the laser cavity.
• Implemented pure phase modulation for mode locking.
• Operated the laser near the 1.5 micrometer wavelength range.

Main Results:

• Successfully achieved pure phase-modulation mode locking.
• Demonstrated stable mode-locked operation using the two-section amplifier.
• The device operated effectively near 1.5 micrometers, a key wavelength for optical communications.

Conclusions:

• Pure phase-modulation mode locking is feasible in extended-cavity semiconductor lasers.
• The two-section optical amplifier is a viable component for achieving mode locking through combined gain and phase modulation.
• This work presents a promising method for developing compact and efficient pulsed semiconductor laser sources.