High Power Diode Lasers - Center for Biomedical Optics and New ...

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CeramOptec GmbH Medical applications : laser diodes at 732 nm Coupling of 4W at 732nm from single emitters into an optical fibre with 400µm core and NA < 0.3 • Bundle of 8 lasers (9 fibres) – ∅≈470µm, NA = 0.15 – P ~ 11W • Coupling to application fibre – ∅ = 200µm, NA = 0.35 – P ~ 8.4W • Outmatches originally planned specs significantly • Runs in “time- mode” = ON for pre- selected treatment time • Has been applied for test of photo- toxicity of photosensitizer
CeramOptec GmbH Application Test of 732 nm system I Evaluation of photo-toxicity of PDT substance (BLC2025) Typical test procedure • Growth of cell cultures • Incubation with photosensitizer in varying concentrations • Excitation of the sensitizer with different energy densities and total energy • Continuation of cell growth • Determination of survival rate, e.g. via concentration of enzymes, which only exist in living cells 100µl cell suspension per well
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Bio-Photonics ’03 Summer School H
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How is a laser diode Max. size : 3
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Which material system for which wav
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substrate Schematic of the growth o
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Layers growth : 2 kinds of epitaxy
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Process Three steps of the planar p
Page 13 and 14: And electrical wires soldering …
Page 15 and 16: The laser diode : assymetric device
Page 17 and 18: • power measurement : high diverg
Page 19 and 20: • far-field measurement Laser dio
Page 21 and 22: W(z) = W W(z) 0 ⎛ 1+ ⎜ ⎜ ⎝
Page 23 and 24: • Catastrophic optical mirror dam
Page 25 and 26: Fabrication •Materials • Epitax
Page 27 and 28: Fabrication •Materials • Epitax
Page 29 and 30: Why a high brightness laser diode a
Page 31 and 32: 12 11 10 CW optical power records d
Page 33 and 34: In the parallel direction : 2 main
Page 35 and 36: The broad-area laser 100 µm large
Page 37 and 38: The ridge laser 5 µm large * 2mm l
Page 39 and 40: Others solutions to improve the bri
Page 43 and 44: Semiconductor amplifier and refract
Page 47 and 48: Between the broad-area laser and th
Page 49 and 50: Index guided tapered lasers bar Min
Page 51 and 52: • Tapered laser bars coupled in a
Page 53 and 54: Beam shaping technique General prin
Page 55 and 56: Beam shaping technique Schematic op
Page 57 and 58: ars at 808-980 nm On the laser diod
Page 59 and 60: Results with broad-area lasers - FB
Page 61 and 62: Results with tapered lasers - FBH 6
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Page 69 and 70: Application Test of 975 nm system C
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High Power Diode Lasers - Center for Biomedical Optics and New ...

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