50 W passively cooled, fiber coupled diode laser at 976 nm for pumping fiber lasers using 100 μm fiber bundles

Wessling, Christian; Hengesbach, St.; Geiger, Jens; Dolkemeyer, Jan; Traub, Martin; Hoffmann, D. H. H.

doi:10.1117/12.763739

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…To overcome these drawbacks, the two pump modules are polarization-coupled and symmetrized by means of step mirrors [19] to balance the beam qualities and provide a round pump beam cross section. After the pump optics, the beam quality is M 2 = 100 in fast-and M 2 = 150 in slow-axis.…”

Section: Pump Optics Designmentioning

confidence: 99%

Diode-pumped Alexandrite laser instrument for next generation satellite-based Earth observation

Strotkamp

Munk

Jungbluth

et al. 2019

International Conference on Space Optics — ICSO 2018

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In this work the first diode-pumped Alexandrite ring laser in Q-switched single-longitudinal mode (SLM) operation is presented. A carefully designed and complex ring resonator with several functional components is combined with an innovative pumping scheme with high-power red laser diodes.The spectral and energetic suitability of a first laser was demonstrated in hundreds of operating hours and, with a novel mobile lidar system, by the first measurements in the atmosphere by means of a diode-pumped Alexandrite laser, yielding data from the stratosphere to the mesosphere.An improved laser yields a pulse energy of 1.7 mJ at a repetition rate of 500 Hz with an excellent beam quality of M 2 < 1.1. By seeding the resonator with a narrow-band diode laser, SLM operation with a linewidth below 4 MHz is achieved. The electro-optical efficiency of 2 % is the highest archived for all Alexandrite lasers in SLM operation and reasonable for space-operation.The performance analysis as well as benchmarking with the space-qualified mounting technology point out the TRL and the remaining effort of development of the technology. INTRODUCTIONUnderstanding temperature distributions and wind fields in the atmosphere at altitudes between 80 and 110 km, i.e. the mesosphere and lower thermosphere (MLT), is crucial for performing numerical simulations of the Earth's climate. The effects of gravity waves on the global wind system and atmospheric dynamics are hardly understood and item of research of space agencies and ground-based observations [1-6]. One well-established approach to provide such data is to measure the Doppler-broadened and -shifted resonance line of metal atoms, e.g. potassium (770 nm or 772 nm) [6,7], iron (386 nm) [8,9] and sodium (589 nm) [10][11][12], by means of a Doppler lidar.While localized measurements have been performed over the last 20 years from the ground and revealed fundamental deviations from the predicted conditions, there is no coverage of global scale by lidar. The development of a spaceborne resonance lidar instrument is deferred by the lack of laser sources at the demanded wavelengths that are suitable for spaceborne operation.The currently used Alexandrite (Cr 3+ :BeAl2O4) lasers with their broad tunability (700-800 nm) [13] are well suited for the generation of several interesting wavelengths, either operating at their fundamental wavelength or intra-cavity frequency-doubled. The flashlamp-pumped Alexandrite ring lasers operating in Q-switched single-longitudinal mode (SLM) operation are commonly used as beam sources in resonance potassium and iron resonance lidar systems [6][7][8][9].However the usage of flashlamps as pump source makes them unsuitable for spaceborne operation, due to the poor efficiency and limited lifetime. One hopeful approach to overcome these drawbacks is by replacing the flashlamps with diode lasers [14,15]. Recently, new basic investigations in the field of diode-pumped Alexandrite lasers have been conducted with focus on altimetry lidar and vegetation monitoring (red-edge) [...

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Section: Pump Optics Designmentioning

confidence: 99%

Diode-pumped Alexandrite laser instrument for next generation satellite-based Earth observation

Strotkamp

Munk

Jungbluth

et al. 2019

International Conference on Space Optics — ICSO 2018

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“…To overcome these drawbacks, the two pump modules are polarization coupled and symmetrized by means of step mirrors [22] to balance the beam qualities and provide a round pump beam cross section. A detailed description of the optical setup can be found in [20].…”

Section: Pump Opticsmentioning

confidence: 99%

Diode-pumped Alexandrite laser for next generation satellite-based earth observation lidar

et al. 2019

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In this work, the design of a diode-pumped Alexandrite ring laser in Q-switched single-longitudinal-mode (SLM) operation for a spaceborne lidar mission is presented. The laser is pumped by a self-developed fiber-coupled laser diode pump device and yields a pulse energy of 1.7 mJ at a repetition rate of 500 Hz with an excellent beam quality of M 2 < 1.1. By seeding the resonator with a narrow band diode laser, SLM operation with a linewidth of approximately 10 MHz is achieved. The electrooptical efficiency of 2% is the highest achieved for all Alexandrite lasers in SLM operation and reasonable for space operation. The performance analysis as well as benchmarking with the space-qualified mounting technology points out the TRL and the remaining effort for the development of the technology. An estimation of the requirements for a spaceborne resonance lidar mission underlines the suitability of such a lidar system with a diode-pumped Alexandrite laser as the beam source.

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“…Fiber coupling conditions of diode laser were shown in Figure 1, The beam parameter product of optical fiber can be expressed as follows [6] :…”

Section: The Conditions Of Fiber-couplingmentioning

confidence: 99%

The research of fiber-coupled high power diode laser

et al. 2011

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High-power diode laser system is still belonging to the novel laser system currently. To realize the output of fiber coupled high power diode laser will greatly enhance the applications of diode laser. In this article, we simulated beam shaping and fiber coupling of diode laser with optical design software ZEMAX®, and discussed the problems would be attended in the process of fiber coupling. Experiments on the beam shaping and fiber coupling were studied. Shape the diode laser beam, homogenize fast and slow axis beam quality, and then realize high power diode laser output through polarization coupling and wavelength coupling. Finally through the self-developed fiber coupling device, we achieved a multi-wavelength high-power fiber-coupled diode laser output, the fiber core diameter 600um, NA 0.22. Before fiber coupling the power of the diode laser was 773W, after fiber coupling, the output power was 664W, and the efficiency of the fiber coupling is up to 85.9%.The fluctuation of the power is less than 1%.

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50 W passively cooled, fiber coupled diode laser at 976 nm for pumping fiber lasers using 100 μm fiber bundles

Cited by 10 publications

References 4 publications

Diode-pumped Alexandrite laser instrument for next generation satellite-based Earth observation

Diode-pumped Alexandrite laser instrument for next generation satellite-based Earth observation

Diode-pumped Alexandrite laser for next generation satellite-based earth observation lidar

The research of fiber-coupled high power diode laser

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