Biomedical Engineering Reference
In-Depth Information
E
r
-Doped
No
E
r
≈ 1.7 ×
I
th
≈ 1.7 ×
I
th
≈ 1.5 ×
I
th
≈ 1.5 ×
I
th
≈ 1.2 ×
I
th
≈ 1.1 ×
I
th
≈
I
th
20 Å
40 Å
15,322 Å
15,655 Å
Wavelength
(a)
Wavelength
(b)
FIGURE 4.24
Comparison of the lasing spectra for (a) an EA-doped HRO laser and (b) control (no Er) HRO
laser at different current injection levels.
• Use an antireflection facet if reflections cannot be avoided.
• Rare-earth doping of the heteropitaxial ridge overgrown layer shows
encouraging results.
• Automatic phase control and automatic current control can be used
to achieve reduced linewidth and stable frequency of operation.
• Maintain a constant laser temperature during operation using ther-
moelectric control.
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