Use of Intracavity Adaptive Optics in Solid-State Lasers Operation at 1 µm

Lubeigt, Walter; Grol, P. van; Valentine, G.J.; Burns, D.

doi:10.1007/3-540-28867-8_23

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…Thus, using equation (5) and considering that the SHG power is quadratically dependent of the fundamental power and that the SHG conversion efficiency is strongly dependent on the beam quality of the fundamental beam, a brightness assessment based on SHG should be an efficient brightness sensing technique.…”

Section: Second-harmonic Generation-based Fitness Sensormentioning

confidence: 99%

“…This inadequacy led to the development and implementation of a range of more advanced non-deterministic algorithms. One such procedure, the Genetic Algorithm (GA) 5,10 , was developed to ensure that the global maximum was always returned by the optimisation process. The GA is closely based on the principles of Darwinian natural selection 11 , a full description can be found 5 and a flowchart of the routine is displayed in figure 5.…”

Section: Optimisation Algorithmsmentioning

confidence: 99%

“…One such procedure, the Genetic Algorithm (GA) 5,10 , was developed to ensure that the global maximum was always returned by the optimisation process. The GA is closely based on the principles of Darwinian natural selection 11 , a full description can be found 5 and a flowchart of the routine is displayed in figure 5. The GA, albeit a little slow, works well, however, issues specifically relating to the time taken to reach an equilibrium state in high average power 'hot' lasers, implied that further algorithm development was necessary.…”

Section: Optimisation Algorithmsmentioning

confidence: 99%

“…The MHC was, as expected very efficient and fast, however, the inability to locate the global maximum was a clear drawback. The flowchart of the MHC routine is show in figure 5. [A full description of the MHC was given 5 .] This inadequacy led to the development and implementation of a range of more advanced non-deterministic algorithms.…”

Section: Optimisation Algorithmsmentioning

confidence: 99%

“…Our initial studies demonstrated the potential for spatial mode enhancement by using an intra-cavity adaptive optics element 5,6 where (as shown in figure 1) a 15mm diameter OKOTECH deformable membrane mirror (DMM) 7 was operated in a computer-controlled, self-optimisation, feedback scheme. Voltage amplifier + multi-channel Digital/Analog converter In this system, the laser output was detected by a beam quality assessor to determine a so-called 'fitness' value, which is then sent to the optimisation algorithm.…”

Section: Introductionmentioning

confidence: 99%

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Brightness enhancement of a solid-state laser using an intra-cavity deformable mirror

2005

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An intra-cavity deformable membrane mirror (DMM) has been used to optimise the brightness of a 15W, diode-pumped, grazing incidence Nd:GdVO 4 laser. In one configuration an order of magnitude improvement of laser beam quality was recorded with negligible drop in output power. Local and global optimum-locating algorithms have been developed to enable automatic optimisation of the laser quality, and have been tested in both intra-and extra-cavity configurations. A novel laser brightness sensor based on second-harmonic-generation has also been developed to assess the progress of the laser towards optimisation. A tip & tilt mirror was also incorporated in the laser resonator cavity and initial tailoring of the algorithm procedure was performed in order to enhance the optimisation capabilities.

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Section: Second-harmonic Generation-based Fitness Sensormentioning

confidence: 99%

Section: Optimisation Algorithmsmentioning

confidence: 99%

Section: Optimisation Algorithmsmentioning

confidence: 99%

Section: Optimisation Algorithmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Brightness enhancement of a solid-state laser using an intra-cavity deformable mirror

2005

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Exploration of the optimisation algorithms used in the implementation of adaptive optics in confocal and multiphoton microscopy

Wright¹,

Burns²,

Patterson³

et al. 2005

Microsc. Res. Tech.

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We report on the introduction of active optical elements into confocal and multiphoton microscopes in order to reduce the sample-induced aberration. Using a flexible membrane mirror as the active element, the beam entering the rear of the microscope objective is altered to produce the smallest point spread function once it is brought to a focus inside the sample. The conventional approach to adaptive optics, commonly used in astronomy, is to utilise a wavefront sensor to determine the required mirror shape. We have developed a technique that uses optimisation algorithms to improve the returned signal without the use of a wavefront sensor. We have investigated a number of possible optimisation methods, covering hill climbing, genetic algorithms, and more random search methods. The system has demonstrated a significant enhancement in the axial resolution of a confocal microscope when imaging at depth within a sample. We discuss the trade-offs of the various approaches adopted, comparing speed with resolution enhancement.

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