82
GH5D305B3D
Hologram Lasers
■
Electro-optical Characteristics
Parameter
1
Focal offset
2
Focal error symmetry
3
Radial error balance
4
RF output amplitude
5
FES output amplitude
Threshold current
Operating current
Operating voltage
Wavelength
Output current
(V
CC
=5V, Vs=1/2 V
CC
, T
C
=25
C)
1
Distance between FES=0 and jitter minimum point
2
(a–b) / (a+b)
3
DPD signal
4
RF output amplitude (focal servo ON, radial servo ON)
5
V
A
–V
B
(Focal vibration)
6
(V
A
+V
B
) / (V
E
+V
F
) (focal servo ON, radial servo OFF)
7
V
E
/ V
F
a–b
2
(a+b)
a (+amplitude of DPD)
b (–amplitude of DPD)
a (+amplitude of FES)
b (–amplitude of FES)
NA=0.60
f =3.3mm
NA=0.13
f =19.07mm
Actuator
Collimated lens
Hologram laser
Single layer DVD disc
Laser driver
APC circuit
Measuring System of Hologram Laser
Symbol
DEF
B
FES
B
RES
V
RF
V
FES
I
th
I
op
V
op
λ
p
I
m
MAX.
+0.5
+20
+20
1.11
0.61
38
49
2.77
660
0.3
Unit
μ
m
%
%
V
V
mA
mA
V
nm
mA
7
Radial spot balance
RSB
125
%
Conditions
V
RF
=0.83V
V
RF
=0.83V
P
H
=3.0mW
P
H
=3.0mW
V
RF
=0.83V
P
H
=2.85mW
P
H
=2.85mW
P
H
=2.85mW
P
H
=2.85mW, V
R
=15V
1.9mW
I(2.85mW)-I(0.95mW)
P
H
=3.0mW
MIN.
-0.5
-20
-20
0.55
0.29
-
-
-
640
0.05
TYP.
-
-
-
0.83
0.44
30
40
2.5
654
(0.2)
P
H
=3.0mW
75
-
Differential efficiency
η
d
0.34
0.52
0.75
mW/mA
6
Main spot balance
MSB
75
-
125
%
Notice
In the absence of confirmation by device specification sheets, SHARP takes no responsibility for any defects that may occur in equipment using any SHARP
devices shown in catalogs, data books, etc. Contact SHARP in order to obtain the latest device specification sheets before using any SHARP device.
Internet address for Electronic Components Group http://sharp-world.com/ecg/
Internet