ROHM RLD-78NP-G1, RLD-78PP-G1 Datasheet

RLD-78PP-G1 / RLD-78NP-G1

Laser Diodes

Title AlGaAs, double-heterojunction,
visible laser diodes

RLD-78PP-G1 / RLD-78NP-G1

RLD-78PP-G1 and RLD-78NP-G1 are the semiconductor laser developed for the laser beam printer application.
We have achieved the very small variations of the optical characteristics and low droop by ROHM original Epitaxial
growth technology using Molecular Beam Epitaxy.
In addition, they have the appropriate characteristics for sensor application as well.

Applications

!!!!

Laser beam printers
Sensors

Features

!

1) Minimum variation of radiation
beam angle.

2) Low droop.

3) High stability wave length.

4) Can be driven by single power
supply.

Absolute maximum ratings

!!!!

Parameter Symbol

Output

Laser
PIN photodiode

Reverse

voltage

Operating temperature
Storage temperature

(Tc=25°C)

Po

R

V

R(PIN)

V

Topr
Tstg

External dimensions

!!!!

90˚±2˚

0.4±0.1

1.0±0.1

φ5.6

2.3
(1.27)

1.2±0.1

6.5±0.5

(3)

Limits

5
2

30

-10~+60

-40~+85

(Units : mm)

+0

−0.025

3−φ0.45

(2)
(1)

Unit
mW

V
V

˚C
˚C

φ1.0Min.

φ3.6

Glass window

Chip

φ4.4+0

P
T

y
p

e

N
T

y

p
e

(3)

L.D. P.D.

(1) (2)

(3)

L.D. P.D.

(1) (2)

Laser Diodes

Electrical and optical characteristics

!!!!

RLD-78PP-G1 / RLD-78NP-G1

(Ta=25°C)

Parameter Symbol
Threshold current
Operating current
Operating voltage

Differential efficiency
Monitor current

Parallel divergence

angle

Perpendicular

divergence angle

Parallel deviation angle
Perpendicular deviation

angle

Emission point

accuracy

Peak emission

wavelength

Droop

θ

//

and

θ ⊥

*

are defined as the angle within which the intensity is 50% of the peak value.

I

th

I

op

V

η

I

m

θ

θ

∆φ

∆φ ⊥

∆X
∆Y
∆Z

λ

∆P

Min.

Typ.

Max.

10

25

15

45

op

//

⊥

-

1.9

0.1

0.2

0.3

0.55

*

8

11

*

25

30

-

//

-

-

-

-

770

-

±80

--

795

785

5

45
65

2.3

0.3

0.9
15

38
±2
±3

10

Unit

mA
mA

V

mW/mA

mA

deg

deg
deg
deg

µm

nm

%

Conditions

-

Po=

3mW

Po=

3mW

2mW

I(3mW)−I(1mW

Po=

3mW

Po=

3mW

Po=

3mW

Po=

3mW

)

Electrical and optical curves

!!!!

5

25˚C
40˚C
50˚C
60˚C

10

20 30 40 50 60 70 80

OPERATING CURRENT : IF (mA)

OPTICAL POWER : PO (mW)

4

3

2

1

0

Fig. 1 Optical output vs. operating current

100

90
80
70

mA)

(

60

th

50
40

30

20

THRESHOLD CURRENT : I

10

-10 0 10-20 20 30 40 50 60 70
PACKAGE TEMPERATURE : T

Fig. 2 Dependence of threshold current

on temperature

1.0

θ direction
θ direction

0.5

RELATIVE OPTICAL INTENSITY

0

-40

C

(˚C)

040

ANGLE (deg)

Fig. 3 Far field pattern