LarryDFW
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- Dec 6, 2008
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After seeing several LPF enthusiasts lose their expensive diodes over the last week,
I think we need to come up with reasonable currents to drive these laser diodes.
With that in mind, I assembled as much data as I could find on various BR diodes.
Sanyo provided a nice chart of pulse LD power.
Sony & Sharp also have pulse power information available on line.
In PM's, Igor & I have discussed the fact that we feel some people are overdriving these LD's.
This is the data that I assembled to give guidelines of operating currents
for reasonably long diode lifetimes (>100 hours).
The chart below starts with:
Pulse Power (from Manufacturer Stated Specs),
Efficiency, Input Power, Voltage (pulse), Input Current(pulse), % Overdrive Power.
I figured backward from Input peak Pulse or Peak power ...,
and in the last column I increased the peak current by 25% to 60% to give estimated operating points.
BR Diode -PulseP-Effic InPow Volt - Input - Overdrive
----------mw---%-----mw--------ma---- Rec.ma - % Over -- - Power
---PHR -- 100 - 24 - - 417 - 5.0 -- 83 --- 104 ma - - 125%- - - 90mw
-4X/S03- 175 - 24 - - 700 - 5.2 - 134 --- 168 ma - - 125% - - 130mw
-SF-210- 200 - 24 - - 800 - 5.3 - 151 --- 189 ma - - 125% - - 175mw
GGW-20L 210 - 24 - - 875 - 5.2 - 168 --- 210 ma - - 125% - - 190mw
---8X --- 250 - 24 -- 1042 - 5.2 - 200 --- 300 ma - - 150% - - 356mw - Tested over 450 hrs.
---8X --- 250 - 24 -- 1042 - 5.2 - 200 --- 348 ma - - 174% - - 455mw - Failed @ 195 hrs.
10X/12X 320 - 25 -- 1280 - 5.3 - 261 --- 420 ma - - 161% - - 600mw - Tested ~ 120 hrs.
S06J-12X 400 - 25 -- 1600 - 5.4 - 296 --- 500 ma - - 165% - - 750mw -
--------------------------------------------------
445 Diode-PulseP-Effic InPow Volt - Input - Overdrive
------------mw---%-----mw--------ma---- Rec.ma - % Over -- - Power
- 445nm - 1000 -25 -- 4000 - 4.5 -1000 -- 1600 ma - - 160% - - 1.75w - 100 hours
445/9mm 1600 -25 -- 5600 - 4.5 -1000 -- 2560 ma - - 160% - - 2.6 w - 100 hours
I also recommend a Schottky diode wired across the power pins with opposite polarity,
to help prevent electrostatic damage.
LarryDFW
I think we need to come up with reasonable currents to drive these laser diodes.
With that in mind, I assembled as much data as I could find on various BR diodes.
Sanyo provided a nice chart of pulse LD power.
Sony & Sharp also have pulse power information available on line.
In PM's, Igor & I have discussed the fact that we feel some people are overdriving these LD's.
This is the data that I assembled to give guidelines of operating currents
for reasonably long diode lifetimes (>100 hours).
The chart below starts with:
Pulse Power (from Manufacturer Stated Specs),
Efficiency, Input Power, Voltage (pulse), Input Current(pulse), % Overdrive Power.
I figured backward from Input peak Pulse or Peak power ...,
and in the last column I increased the peak current by 25% to 60% to give estimated operating points.
BR Diode -PulseP-Effic InPow Volt - Input - Overdrive
----------mw---%-----mw--------ma---- Rec.ma - % Over -- - Power
---PHR -- 100 - 24 - - 417 - 5.0 -- 83 --- 104 ma - - 125%- - - 90mw
-4X/S03- 175 - 24 - - 700 - 5.2 - 134 --- 168 ma - - 125% - - 130mw
-SF-210- 200 - 24 - - 800 - 5.3 - 151 --- 189 ma - - 125% - - 175mw
GGW-20L 210 - 24 - - 875 - 5.2 - 168 --- 210 ma - - 125% - - 190mw
---8X --- 250 - 24 -- 1042 - 5.2 - 200 --- 300 ma - - 150% - - 356mw - Tested over 450 hrs.
---8X --- 250 - 24 -- 1042 - 5.2 - 200 --- 348 ma - - 174% - - 455mw - Failed @ 195 hrs.
10X/12X 320 - 25 -- 1280 - 5.3 - 261 --- 420 ma - - 161% - - 600mw - Tested ~ 120 hrs.
S06J-12X 400 - 25 -- 1600 - 5.4 - 296 --- 500 ma - - 165% - - 750mw -
--------------------------------------------------
445 Diode-PulseP-Effic InPow Volt - Input - Overdrive
------------mw---%-----mw--------ma---- Rec.ma - % Over -- - Power
- 445nm - 1000 -25 -- 4000 - 4.5 -1000 -- 1600 ma - - 160% - - 1.75w - 100 hours
445/9mm 1600 -25 -- 5600 - 4.5 -1000 -- 2560 ma - - 160% - - 2.6 w - 100 hours
I also recommend a Schottky diode wired across the power pins with opposite polarity,
to help prevent electrostatic damage.
LarryDFW
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