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

More documents

Recommendations

Info

What is the limitation of the emitted power • <strong>Diode</strong> heating : power saturation , normally non-destructive (thermal roll-over) 400 350 300 250 P (mW) 200 150 100 • Catastrophic optical mirror damage (COMD) : destructive 50 0 0 200 400 600 800 1000 I (mA) BC BV hν Recombinaison non-radiative électron-trou de surface Elévation de température Réabsorption optique COMD Face-miroir Filamentation
• Catastrophic optical mirror damage (COMD) : destructive Maximal emitted power: P MAX (mW / µm ) = P ( λ) COMD 1−R . 1+ R d Γ PCOMD: internal optical power density at threshold COMD R: mirror reflectivity d: active region thickness (reabsorbing) Γ: overlap of the transverse mode with the active region d : transverse spot size Γ Active-Region material P COMD (MW /cm 2 ) InGaAs (0.92 - 0.98µm) 18-19 InGaAsP (0.81µm) 18-19 InAlGaAs (0.81µm) 13-14 GaAs (0.81 - 0.87µm) 10-12 Al 0.07 GaAs (0.81µm) 8-9 Al 0.13 GaAs (0.78µm) 5 (Botez, SPIE proceedings, vol. 3628, p5, 1999) To increase P max : >Structure design: - enlarged guides >Active region materials: -InAlGaAs - InGaAsP (Al-free)
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: W(z) = W W(z) 0 ⎛ 1+ ⎜ ⎜ ⎝
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
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 ...

Create successful ePaper yourself

Delete template?

Save as template?