Optically pumped light emitting diodes (OP LEDs) Specifications (T

1
Optically pumped light emitting diodes (OP LEDs)
Specifications (T=24 0C)
Type No.
MIRO36-xx-xxxxx series
λ
Peak wavelength
Spectral FWHM,
Pulse duration
τ
Pulse period
T
μm
3.6±0.1
μm
0.60÷0.65
≤10
μs
Pulse conditions:
≥1000
Maximum pulse current
Ipulse
mA
1000
Pulse voltage at I=1000 mA
Upulse
V
2.1÷2.8
Pulse power at I=1000 mA
Ppulse
μW
300±40
Maximum CW current (with a heatsink)
Icw
mA
50
CW voltage at I=50 mA
Ucw
V
1.30÷1.4
CW power at I=50 mA
PCW
μW
25±4
dλ/dT
nm/K
-3.1
dP/dT
%/K
-(0.6÷0.7)
Package
House
code
Lens
type
TO18
-
TO18
mIL
TO39
-
TO39
IL
Lens
material
Chalcogenide
glass
CdSb or Si
Emission
size
Angle of
view FWHM
mm
deg
∅ 0.8
≤140
-25 to +55
-25 to +50
short leg or
key is
negative
∅ 1
≤50
-25 to +50
-25 to +45
the same
∅ 0.8
≤140
-25 to +55
-25 to +50
the same
∅ 3.5
≤35
-25 to +50
-25 to +45
the same
Type No. MIRO36-140-18s MIRO36-50-18GmL
(TO18)
Package
photo
(TO18+mIL)
Storage
conditions
0
Operation
conditions
Polarity
0
C
C
MIRO36-140-39s
MIRO36-50-39GmL
MIRO36-35-39CL
(TO39)
(TO39+mIL)
(TO39+IL)
2
General characterization
Current dependence of the output power (L-I) (24
0
C)
Pulse power (mW)
Pulse power (mW)
0.30
TO39 attached
to a heatsink
0.4
0.3
0.2
o
24 C, f=2 kHz
τ=10 μs
τ=50 μs
τ=250 μs
0.1
0.0
0
0.20
0.15
o
24 C, f=2 kHz
τ=10 μs
τ=50 μs
τ=250 μs
0.10
0.05
0.00
200 400 600 800 1000 1200 1400 1600
TO18 attached
to a heatsink
0.25
0
200
600
800
1000
0.20
Pulse power (mW)
TO39 without
a heatsink
0.25
0.20
0.15
o
24 C, f=2 kHz
τ=10 μs
τ=50 μs
τ=250 μs
0.10
0.05
0
200
400
600
800
1000
TO18 without
a heatsink
0.15
0.10
o
24 C, f=2 kHz
τ=10 μs
τ=50 μs
τ=250 μs
0.05
0.00
0
Current (mA)
100
200
300
400
500
Current (mA)
Maximal current vs. operation conditions
3000
Duty cycle = τ/T,
τ - pulse duration,
2000
T - period duration
Maximum current, mA
Pulse power (mW)
0.30
0.00
400
Current (mA)
Current (mA)
1000
900
800
700
600
500
400
300
200
TO39 attached to a heatsink
TO39 without and TO18 with a heatsink
TO18 without a heatsink
100
90
80
70
60
50
0.01
0.1
Duty cycle
1
600
3
Current dependence of the emission spectra(24
3.0
2.5
2.0
1.5
100 mA
500 mA
1000 mA
2000 mA
0.5
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
1.0
1.0
o
24 C,
f=2 kHz,
τ=5 μs
0.5
Normalized intensity
Intensity (arb.un.)
100 mA
500 mA
1000 mA
0.5
100 mA
1000 mA
2000 mA
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
2.0
TO18 without
a heatsink
TO18 attached
to a heatsink
o
24 C,
f=2 kHz,
τ=5 μs
1.0
1.5
C, f=2kHz, τ=5 μs)
1.0
TO18 attached
to a heatsink
Normalized intensity
Intensity (arb.un.)
3.5
0
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
0.5
TO18 without
a heatsink
100 mA
500 mA
1000 mA
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
Normalized emission spectra at maximal current(24
TO18 attached
to a heatsink
o
24 C,
f=2
kHz,
0.5
τ=50 μs
I=500 mA
Normalized intensity
Normalized intensity
C)
1.0
1.0
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
o
24 C,
f=2 kHz,
0.5
τ=50 μs
I=250 mA
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
o
0.5
24 C,
f=2 kHz,
τ=250 μs
I=150 mA
1.0
Normalized intensity
TO18 without
a heatsink
TO18 attached
to a heatsink
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
1.0
Normalized intensity
0
TO18 without
a oheatsink
24 C,
f=2 kHz,
τ=250 μs
0.5
I=100 mA
0.0
2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
Wavelength (μm)
4
3.80
1.5
3.75
1.4
Power at fix. current
Peak wavelength (μm)
Emission spectra and output power vs. temperature
3.70
3.65
3.60
3.55
3.50
1.3
1.2
1.1
1.0
0.9
0.8
3.45
-20 -10
0
10
20
30
40
50
-20 -10
0
10
20
30
40
50
Temperature (C)
Temperature (C)
500
3000
400
2500
Current (mA)
Current (mA)
Current-voltage (I-V) characteristics
300
200
100
0
2000
1500
1000
500
1.2
1.3
1.4
1.5
1.6
0
1.0
1.7
1.5
2.0
2.5
3.0
3.5
4.0
Voltage (V)
Voltage (V)
Far-field pattern
1.0
1.0
1.0
Lens type: IL
FWHM=34 deg.
Lens type: miL
FWHM=50 deg
Intensity, arb. units
0.8
0.6
0.5
0.5
No lens
FWHM=140 deg
0.4
0.2
0.0
-90
-60
-30
0
30
Angle, deg.
60
90
0.0
-90
-60
-30
0
30
Angle, deg.
60
90
0.0
-90
-60
-30
0
30
Angle, deg.
60
90
5
Several useful notes
Microimmersion lenses (mIL) are made from chalcogenide glass with low
melting temperature (60-70oC). That’s why, please, try to install them
vertically, pay attention to heasinking conditions and avoid any
heaters close to the miL-LEDs.
Maximum operating current is defined as that producing Δt=10-20 K
overheating of the p-n junction relative to a heatsink temperature. We
recommend not exceeding 0.75×Imax for long term operating devices.
In certain applications it’s important to
know that in addition to mid-IR radiation
most optically pumped LEDs emit NIR pumping
radiation λ≅0.87 μm as well (see graph on
the right). This “parasitic” emission can
be cut off by filters or by a detector
window, e.g. by CdSb lens in TO-39 packed
LEDs.
Intensity (arb.un.)
1.0
0.5
0.0
0.80
0.85
0.90
0.95
Wavelength (μm)
Don’t touch the chip, connecting wires and miL surface.
Answers to frequently asked questions
Q: What are the advantages of the IL and mIL package?
A: OP LEDs with immersion lenses emit radiation within small spatial
angle, so it is easier to get a signal at some distance from the LED.
Q: What is the main difference between LEDs with microimmersion lens
(mIL) and LEDs with immersion lens (IL)?
A: miL LEDs are brighter/smaller than the L-equipped LEDs and thus
standard detectors with 1×1 mm2 area can be used (spherical mirror or
close “face-to-face” schemes). However, IL LEDs are more stable than
the mil LEDs with respect to heating and high drive currents.