
94
Hologram Lasers
Notice
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GH5CD05B3D
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Electro-optical Characteristics
Parameter
1
Focal offset
2
Focal error symmetry
3
Radial error balance
4
RF output amplitude
(V
CC
=5V, V
S
=1/2 V
CC
,T
C
=25
C)
Symbol
DEF
B
FES
B
RES
V
RF
MAX.
+0.7
+25
+25
-
Unit
μ
m
%
%
V
6
RES output amplitude
Threshold current
Operating current
Operating voltage
Wavelength
Output current
V
RES
I
th
I
op
V
op
λ
p
I
m
0.49
39
50
2.2
795
1.00
V
Differential efficiency
η
d
0.55
mW/mA
Conditions
V
RF
=1.1V
V
RF
=1.1V
P
H
=3.0mW
P
H
=3.0mW
V
RF
=1.1V
V
RF
=1.1V
P
H
=3.0mW
P
H
=3.0mW
P
H
=3.0mW
P
H
=3.0mW, V
R
=15V
MIN.
-0.7
-25
-25
0.90
TYP.
-
-
-
1.70
0.25
-
-
-
770
(0.12)
0.36
25
36
1.75
780
0.55
2.0mW
I(3.0mW)-I(1.0mW)
0.17
0.27
5
FES output amplitude
V
FES
0.46
0.70
0.94
V
mA
mA
V
nm
mA
1
Distance between FES=0 and jitter minimum point
At the condition of FES sensitivity = 20%/1μm
2
(a–b) / (a+b)
3
Offset of hologram laser is included.
4
Amplitude of V
A
+V
B
+2V
C
(focal servo ON, radial servo ON)
5
V
A
–V
B
(Focal vibration)
6
V
E
–V
F
(focal servo ON, radial servo OFF)
a–b
2
(a+b)
a (+amplitude of RES)
b (–amplitude of RES)
GND
a (+amplitude of FES)
b (–amplitude of FES)
NA=0.50
f =4.5mm
NA=0.11
f =20.6mm
Disc
(SONY : YEDS-18)
Laser driver
APC circuit
Actuator
Collimated lens
Hologram laser
Measuring System of Hologram Laser