Page 240 - Photonics Essentials an introduction with experiments
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Measurements in Photonics
234 Characterizing Photonic Devices in the Laboratory
Replicas made from classically ruled masters measured under near Littrow conditions
with 8° between incident and diffracted beams—relative to reflectance of aluminum.
Polarized to grooves (S-Plane) Polarized to grooves (P-Plane)
100
90 Reflectance of Aluminum
80
BLAZE ANGLE
5.2°
70
BLAZE WAVELENGTH
300 nm
Efficiency, % 60 GROOVES/mm
600
50
40
DIFFRACTION GRATING
EFFICIENCY FOR RELATIVE
COMPARISON ONLY
10
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
Wavelength, m
(a)
100
90 Reflectance of Aluminum
80
BLAZE ANGLE
8.6°
70
BLAZE WAVELENGTH
Efficiency, % 60 GROOVES/mm
500 nm
600
50
40
30
20
10
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6
Wavelength, m
(b)
Figure 10.6. Grating efficiency curves for three different grating structures. (a) Blaze
wavelength 300 nm, 600 grooves/mm. (b) Blaze wavelength 500 nm, 600 grooves/mm.
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