High Power Diode Lasers - Center for Biomedical Optics and New ...
High Power Diode Lasers - Center for Biomedical Optics and New ...
High Power Diode Lasers - Center for Biomedical Optics and New ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
• Catastrophic optical mirror damage (COMD) : destructive<br />
Maximal emitted power:<br />
P<br />
MAX<br />
(mW /<br />
µm )<br />
= P ( λ)<br />
COMD<br />
1−R<br />
.<br />
1+<br />
R<br />
d<br />
Γ<br />
PCOMD: internal optical power density at threshold COMD<br />
R: mirror reflectivity<br />
d: active region thickness (reabsorbing)<br />
Γ: overlap of the transverse mode with the active region<br />
d : transverse spot size<br />
Γ<br />
Active-Region material P COMD (MW /cm 2 )<br />
InGaAs (0.92 - 0.98µm) 18-19<br />
InGaAsP (0.81µm) 18-19<br />
InAlGaAs (0.81µm) 13-14<br />
GaAs (0.81 - 0.87µm) 10-12<br />
Al 0.07 GaAs (0.81µm) 8-9<br />
Al 0.13 GaAs (0.78µm) 5<br />
(Botez, SPIE proceedings, vol. 3628, p5, 1999)<br />
To increase P max :<br />
>Structure design:<br />
- enlarged guides<br />
>Active region materials:<br />
-InAlGaAs<br />
- InGaAsP (Al-free)
Change language