RLD78MYA1
Laser diodes
!Electrical and optical characteristics (Tc=25°C)
Parameter
Symbol
Min. Typ. Max.
Unit
mA
mA
V
Conditions
Threshold current
I
th
op
op
−
−
−
35
45
60
70
−
Po=
Po=
Operating current
Operating voltage
I
3mW
3mW
V
1.9
2.3
2mW
Differential efficiency
η
0.1
0.25
0.6 mW/mA
(
)
(
)
I 3mW −I 1mW
Po=
(
)
=
Monitor current
I
m
0.05 0.15
0.3
15
45
2
mA
deg
deg
deg
deg
3mW,VR PIN 15V
∗
∗
Parallel divergence angle
Perpendicular divergence angle
Parallel deviation angle
Perpendicular deviation angle
θ
//
8
20
−
11
37
−
θ
⊥
Po=
3mW
∆φ//
∆φ
⊥
−
−
3
∆X
∆Y
∆Z
Emission point accuracy
−
−
100
µm
−
Po=
f=
Peak emission wavelength
Signal-to-noise ratio
λ
770
60
785
810
nm
dB
3mW
∆ =
S / N
−
−
720kHz, f 10kHz
∗
θ
// and
θ
⊥ are defined as the angle within which the intensity is 50% of the peak value.
!Electrical and optical characteristic curves
1.0
100
90
5
4
3
2
−10°C
0°C
80
70
60
25°C
40°C
60°C
70°C
75°C
θ
θ
direction
direction
50
40
0.5
30
20
1
0
0
-40
10
-10
0
40
0
10 20 30 40 50 60 70 80
10 20 30 40 50 60 70 80
ANGLE (deg)
PACKAGE TEMPERATURE : T (°C)
C
OPERATING CURRENT : I (mA)
F
Fig.3 Far field pattern
Fig.2 Dependence of threshold
current on temperature
Fig.1 Optical output vs.operating current
800
790
780
770
5
4
3
2
T =25°C
C
P
P
P
O
=2.5mW
=2mW
=1mW
O
O
1
0
775
780
785
790
-10
0
10 20 30 40 50 60 70 80
0.1
0.2
0.3
0.4
0.5
WAVELENGTH : λ (nm)
PACKAGE TEMPERATURE : Tc (°C)
MONITOR CURRENT : I
m
(mA)
Fig.5 Dependence of emission
spectrum on optical output
Fig.4 Dependence of wavelength
on temperature
Fig.6 Monitor current vs.optical output
2/3
ROHM [ ROHM ]
