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

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Laser structure 732 nm : GaAsP / AlGaAs / AlGaAs • Tensile strained GaAsP QW TM polarisation • High Al – content of waveguide and cladding layers • LOC structure (1µm waveguide)
Fabrication •Materials • Epitaxy • Process Characterization Laser diodes • power and spectrum measurement • far-field and near-field measurement • The M² factor : definition, measurement • Saturation of the power : cause and solution = the large optical cavity Main epitaxial structures : at 808 nm, 940 nm, 980 nm and 732 nm Examples of lasers diodes • Ridge and broad-area lasers at 980 nm • high brigthness lasers near at 980 nm • state of the art • external approach : four-wave mixing • internal approach : the tapered laser diode • Tapered lasers bars at 980 nm coupled into an optical fiber • Laser diodes at 732 nm : broad-area laser results and aging test • Application to photodynamic therapy of laser diodes at 732 nm • Application to surgery and denistry of laser diodes at 980 nm
Page 1 and 2: Bio-Photonics ’03 Summer School H
Page 3 and 4: How is a laser diode Max. size : 3
Page 5 and 6: Which material system for which wav
Page 7 and 8: substrate Schematic of the growth o
Page 9 and 10: Layers growth : 2 kinds of epitaxy
Page 11 and 12: 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: 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
Page 63 and 64: CeramOptec GmbH Medical application
Page 65 and 66: CeramOptec GmbH Application Test of
Page 67 and 68: CeramOptec GmbH Application Test of
Page 69 and 70: Application Test of 975 nm system C

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

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