Mr. Mohammad Ali Alloush Profile

Mohammad Ali Alloush

PhD Student at Ruhr-Univ Bochum

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Publications (5)

Proceedings Article | 5 March 2021 Presentation

Passive- and self- mode-locking based ultrashort pulse generation in monolithic diode laser at 1550 nm

Ali Alloush, Navina Kleemann, Lukas Braun, Carsten Brenner, Marlene Zander, Wolfgang Rehbein, Martin Moehrle, Martin R. Hofmann

Proceedings Volume 11705, 1170509 (2021) https://doi.org/10.1117/12.2583134

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Proceedings Article | 22 April 2020 Paper

Self-mode-locking and chirp compensation in an external cavity diode laser at 1550 nm

Ali Alloush, Amer Bassal, Carsten Brenner, Catherine Fortin, Karim Mekhazni, Piero Gamarra, Cosimo Calò, Martin Hofmann

Proceedings Volume 11356, 113560H (2020) https://doi.org/10.1117/12.2555946

KEYWORDS: Dispersion, Semiconductor lasers, Ultrafast phenomena, Mode locking, Picosecond phenomena, Single mode fibers, Molybdenum, Autoregressive models, Alternate lighting of surfaces, Semiconductors

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Proceedings Article | 24 February 2020 Paper

Comparison of self-mode-locking in monolithic and external cavity diode laser at 1550 nm

M. Ali Alloush, Amer Bassal, Carsten Brenner, Catherine Fortin, Karim Mekhazni, Piero Gamarra, Cosimo Calo, Martin Hofmann

Proceedings Volume 11301, 113011T (2020) https://doi.org/10.1117/12.2545780

KEYWORDS: Dispersion, Semiconductor lasers, Ultrafast phenomena, Molybdenum, Picosecond phenomena, Electrocardiography, Mode locking, Single mode fibers, Alternate lighting of surfaces, Semiconductors

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Proceedings Article | 9 May 2018 Paper

Mode-locked diode laser with resonant ring amplifier

M. Ali Alloush, Rouven Pilny, Carsten Brenner, Thomas Prziwarka, Andreas Klehr, Andrea Knigge, Günther Tränkle, Martin Hofmann

Proceedings Volume 10682, 106820N (2018) https://doi.org/10.1117/12.2307220

KEYWORDS: Optical amplifiers, Semiconductor lasers, Amplifiers, Mode locking, Oscillators, Ultrafast phenomena, Resonators

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We present a ring semiconductor amplifier system which is seeded by ultrashort pulses for additive amplification. An external cavity diode laser configuration is built to generate the ultrashort pulses based on a hybrid modelocking scheme. A monolithic multi-segment diode laser is utilized as a light source in the operating oscillator. It has the advantage that the gain and absorber are integrated on one chip. The oscillator operates at a fundamental repetition-rate of 206MHz and can be driven on various harmonics of this frequency. The generated pulses are injected into a tapered amplifier (TA) which consists of a ridge waveguide section (RWS) for coupling and a tapered section (TS) for amplification. The amplified pulses are coupled back after amplification towards the TAs RWS forming a ring resonator setup. By matching the cavity lengths of the oscillator and ring resonator, we can obtain additively amplified pulses. The emission spectrum of the chosen TA is centered around 850nm which is in the wavelength range of the oscillator. The spectrum of the additively amplified pulses is observed for different pumping parameters of the TA using an optical spectrum analyzer. Additionally, we characterized the system for the best seeding parameters by monitoring the output signal with an autocorrelator. We figured out that the best performance is achieved when the amplifier is seeded by pulses at the second harmonic of 412 MHz. When blocking the seeding pulses the amplifier operates in continuous wave (CW) regime. By comparing the obtained spectra for CW and additively amplified pulses, we conclude that the system operates with a CW background also in pulsed operation. However, from the comparison of the spectra, we estimate that the amplified pulsed power is about 120mW for a seed power of 1:1mW. Thus, the ring amplifier provides a significantly higher amplification than a single pass amplifier. In future work the CW background has to be suppressed, e.g. by synchronous modulation of the current into the amplifiers ridge waveguide section.

Proceedings Article | 19 February 2018 Paper

Passive, active, and hybrid mode-locking in a self-optimized ultrafast diode laser

M. Ali Alloush, Rouven Pilny, Carsten Brenner, Andreas Klehr, Andrea Knigge, Günther Tränkle, Martin Hofmann

Proceedings Volume 10553, 105530N (2018) https://doi.org/10.1117/12.2290086

KEYWORDS: Mode locking, Semiconductor lasers, Spatial light modulators, Ultrafast phenomena, Evolutionary algorithms, Diodes, Pulsed laser operation, Laser resonators

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