Femtosecond diode laser MOPA system at 920 nm based on asymmetric colliding pulse mode-locking

Ulm, Thorsten; Klehr, A.; Erbert, G.; Harth, Florian; L’huillier, Johannes A.

doi:10.1007/s00340-010-3963-4

“…Recently, methods to increase power output and reduce pulse width for diode lasers have been researched. Ulm et al developed a master oscillator power amplifier system for a 920nm wavelength to achieve pulse widths as short as 267fs with an average power of 708mW and a peak power of 661W, at a repetition rate of 3.3GHz and pulse energy of 213pJ [45]. This was done by compressing picoseconds pulses that are output from an oscillator to femtosecond pulses post amplifier.…”

Section: Diode Lasers For Micropropulsionmentioning

confidence: 99%

Using A High Repetition Rate Nd: YAG Laser For Pulsed Laser Ablation Propulsion

Hayek¹

2021

Preprint

0

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Laser propulsion is a relatively new technology being researched for its vast potential. A test apparatus was developed to measure small forces using piezoelectric films and a developed amplifier tuned to the specific frequencies expected from the system. The system provided consistent results comparable to published values. The tests conducted in this thesis evaluated the effects of using a high repetition rate laser for laser propulsion. The results are on the micropropulsion scale, however, the findings are expected to perform similarly on a larger scale. The thrust, moment coupling coefficient, and specific impulse values were evaluated for aluminum, brass, and PVC of differing thicknesses. The results concluded that the repetition rate in fact did not have much effect on the thrust; thrust was primarily dependent on the pulse energy and the material thickness. The repetition rate was found to affect the specific impulse values; a result of the heat affected zone created by the laser ablation, thereby reducing the effective propellant used for propulsion.

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“…Recently, methods to increase power output and reduce pulse width for diode lasers have been researched. Ulm et al developed a master oscillator power amplifier system for a 920nm wavelength to achieve pulse widths as short as 267fs with an average power of 708mW and a peak power of 661W, at a repetition rate of 3.3GHz and pulse energy of 213pJ [45]. This was done by compressing picoseconds pulses that are output from an oscillator to femtosecond pulses post amplifier.…”

Section: Diode Lasers For Micropropulsionmentioning

confidence: 99%

Using A High Repetition Rate Nd: YAG Laser For Pulsed Laser Ablation Propulsion

Hayek¹

2021

Preprint

0

View full text Add to dashboard Cite

Laser propulsion is a relatively new technology being researched for its vast potential. A test apparatus was developed to measure small forces using piezoelectric films and a developed amplifier tuned to the specific frequencies expected from the system. The system provided consistent results comparable to published values. The tests conducted in this thesis evaluated the effects of using a high repetition rate laser for laser propulsion. The results are on the micropropulsion scale, however, the findings are expected to perform similarly on a larger scale. The thrust, moment coupling coefficient, and specific impulse values were evaluated for aluminum, brass, and PVC of differing thicknesses. The results concluded that the repetition rate in fact did not have much effect on the thrust; thrust was primarily dependent on the pulse energy and the material thickness. The repetition rate was found to affect the specific impulse values; a result of the heat affected zone created by the laser ablation, thereby reducing the effective propellant used for propulsion.

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“…Lower repetition rates have been demonstrated by use of external cavities [5][6][7] or pulse picking. 8 GHz repetition rate lasers offer the advantage of a high average power, because a short repetition time allows for an efficient energy extraction from the semiconductor gain medium.…”

Section: Introductionmentioning

confidence: 97%

“…7,12 However, the low output power of few tens of milliwatts from a single-stripe oscillator requires a high-power amplification stage, which usually tends to introduce pulse broadening. We therefore abandon the attempt to form femtosecond pulses within the laser cavity and rely on the principle of chirped-pulse amplification (CPA) instead 5,6 to maximize the energy extraction from the amplifier. We can then take advantage from the fact that our master oscillators emit spectrally broad picosecond pulses.…”

Section: Introductionmentioning

confidence: 99%

Passively mode-locked 1 GHz MOPA system generating sub-500-fs pulses after external compression

Ulm

¹

,

Harth

²

,

Klehr

³

et al. 2012

SPIE Proceedings

2

0

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We compared the performance of DQW and TQW edge-emitters in a passively mode-locked 1 GHz MOPA system at 1075 nm wavelength. Passive mode-locking is induced by applying a reverse DC voltage to the absorber section. The average power is increased up to 0.9 W by a single-stripe pre-amplifier and a tapered amplifier. After compensation of the quadratic chirp in a grating compressor we achieved a pulse duration of 342 fs. We found that the oscillator gain current and the absorber bias voltage have significant impact on the pulse duration. Both parameters were used to optimize the MOPA system with respect to the shortest pulse length after compression.

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Femtosecond diode laser MOPA system at 920 nm based on asymmetric colliding pulse mode-locking

Cited by 6 publications

References 19 publications

Using A High Repetition Rate Nd: YAG Laser For Pulsed Laser Ablation Propulsion

Using A High Repetition Rate Nd: YAG Laser For Pulsed Laser Ablation Propulsion

Using A High Repetition Rate Nd: YAG Laser For Pulsed Laser Ablation Propulsion

Passively mode-locked 1 GHz MOPA system generating sub-500-fs pulses after external compression

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