Dr. Alexander Bachmann Profile

Dr. Alexander Bachmann

at Univ of Applied Sciences Nuernberg

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Publications (4)

Proceedings Article | 28 April 2010 Paper

2.34-µm electrically pumped VECSEL with buried tunnel junction

Antti Härkönen, Alexander Bachmann, Shamsul Arafin, Kimmo Haring, Jukka Viheriälä, Mircea Guina, Markus-Christian Amann

Proceedings Volume 7720, 772015 (2010) https://doi.org/10.1117/12.854467

KEYWORDS: Mirrors, Semiconductor lasers, Gallium antimonide, Vertical cavity surface emitting lasers, Mid-IR, Environmental monitoring, Laser applications, Reflectivity, Gases, Molecular beam epitaxy

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Proceedings Article | 16 May 2008 Paper

Strain sensor using phase measurement techniques in polymer optical fibers

A. Bachmann, M. Luber, H. Poisel, O. Ziemann

Proceedings Volume 7004, 70041N (2008) https://doi.org/10.1117/12.785797

KEYWORDS: Sensors, Phase only filters, Modulation, Phase shift keying, Polymer optical fibers, Phase measurement, Transmitters, Receivers, Fiber Bragg gratings, Phase shifts

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Proceedings Article | 13 July 2007 Paper

Preliminary results on diode-laser assisted vaporization of prostate tissue

Ronald Sroka, Michael Seitz, Oliver Reich, Alexander Bachmann, Verena Steinbrecher, Alexander Ackermann, Christian Stief

Proceedings Volume 6632, 663206 (2007) https://doi.org/10.1117/12.728390

KEYWORDS: Prostate, Semiconductor lasers, Laser tissue interaction, Laser therapeutics, Tissues, Bladder, Laser ablation, Absorption, Ferroelectric materials, Surgery

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Introduction and objectives: The aim was to identify the capability and the laser parameter of under water tissue vaporisation by means of a diode laser (1470 nm). Afterwards the feasibility and postoperative clinical outcome of vaporization of the prostate was investigated. Method: After acquiring suitable laser parameters in in-vitro experiments using a perfused tissue model patients (n=10) suffering from bladder outlet obstruction due to benign prostatic hyperplasia (BPH) were treated by diode laser. Their clinical outcome, in terms of acceptance and post-operatively voiding were evaluated. The diode laser emitted light of the wavelength of 1470 nm at 50 W (Biolitec GmbH) and delivered to the tissue by means of a side-fire fibre introduced through a 24F continuous-flow cystoscope. Normal saline was used for irrigation with an additive of 1% ethanol. The prostatic lobes (volume range 35-80ml) were vaporized within the prostatic capsular using sweeping and push and pull technique. The mean time of laser application was 2400 sec (1220-4000 sec) resulting in applied energies of 121 kJ in the mean (range: 61-200kJ). Results: During laser treatment none of the 10 patients showed any significant blood loss or any fluid absorption (no ethanol uptake). Foley catheters were removed between 18 and 168 hours postoperatively (mean: 49.8h±46h). After removal of the catheter the mean peak urine flow rate increased from 8.9ml/s ± 2.9ml/s pre-operatively in comparison to 15.7ml/s ± 5 ml/s (p=0.049) post-operatively. 8/10 patients were satisfied with their voiding outcome. None of the patients showed appearance of urgency, dysuria, hematuria, or incontinence but two patients required re-catheterization. After a follow-up of 1month, 8/10 patients showed evidence of good results and are satisfied with the outcome. Two patients required consecutive TUR-P. After a follow-up of 6-month the 8 patients are still satisfied. Conclusions: This very early and limited experience using a 50W-Diode laser emitting at 1470 nm indicates a safe and effective treatment modality for quickly relieving bladder outlet obstruction due to BPH. Larger randomized clinical trials to compare this technique with standard transurethral resection of the prostate and increased follow-up data are needed to determine its long-term efficacy and durability.

Proceedings Article | 9 July 2004 Paper

Future directions for microstructured polymer optical fibers

Maryanne Large, Alexander Argyros, Geoff Barton, Felicity Cox, Geoffrey Henry, Nader Issa, Steven Manos, Whayne Padden, Leon Poladian, Martijn van Eijkelenborg, Alexander Bachmann, Karl-Friedrich Klein, Hans Poisel

Proceedings Volume 5360, (2004) https://doi.org/10.1117/12.531138

KEYWORDS: Polymers, Phase only filters, Optical fibers, Signal attenuation, Polymer optical fibers, Multimode fibers, Structured optical fibers, Doping, Diffusion, Endoscopy

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