Hello all,
Long time did not posted here. Now I'm back with a strange problem.
Yesterday I received few "445nm" diodes.
Start to mount first one in an AIXIZ nut. - done
Preseted current on LM317 driver at 600mA - done
Join togetger diode + driver - done
powered from a bench supply using 7.5-8V as input
After few seconds (3-4seconds) lasing, first 2 diodes died!
Now strange things: current even preseted at 600mA before connecting 445nm diode, will sit at 130mA and diode is lasing! (not so strong, but lasing). Very unexpected behaviour!!! I know that all casio A130 and A140 diodes has treshold current over 200mA! This one start lasing under 200mA which makes me to suspect that I received wrong diodes.
Grab another diode. Same scenario, input voltage 8V. Start lasing.
Preseted current 600mA (max adjustable value 800mA)
- flow trough diode ONLY 130mA, lasing
- start rotating pot and increase curent up to 250-260mA (max I could get and corresponding to 800mA max value position)!!! mesured optical power 70mW!
Replaced driver with other model (CW current regulator too). Now at 7.2V input I am getting 130mW at 430mA using 405G1 glass lens! Still under xj-A130 or xj-A140 specs from other forum members! Trying to increase input voltage increased the current. When reached 500mA/8V diode died instantly!
I want to mention that booth drivers used are CW, and with other diodes are working - red, blue (405nm) and IR - without any problems.
In the afternoon I will try to take some pictures from diodes I received. On the back side it has a stamp. Maybe someone can recognize them and confirm or infirm my doubt: are those diodes A130, or A140 or ARE NOT 445nm diodes and seller sent to me by mistake some 405nm diodes!
Regards,
Alx
Long time did not posted here. Now I'm back with a strange problem.
Yesterday I received few "445nm" diodes.
Start to mount first one in an AIXIZ nut. - done
Preseted current on LM317 driver at 600mA - done
Join togetger diode + driver - done
powered from a bench supply using 7.5-8V as input
After few seconds (3-4seconds) lasing, first 2 diodes died!
Now strange things: current even preseted at 600mA before connecting 445nm diode, will sit at 130mA and diode is lasing! (not so strong, but lasing). Very unexpected behaviour!!! I know that all casio A130 and A140 diodes has treshold current over 200mA! This one start lasing under 200mA which makes me to suspect that I received wrong diodes.
Grab another diode. Same scenario, input voltage 8V. Start lasing.
Preseted current 600mA (max adjustable value 800mA)
- flow trough diode ONLY 130mA, lasing
- start rotating pot and increase curent up to 250-260mA (max I could get and corresponding to 800mA max value position)!!! mesured optical power 70mW!
Replaced driver with other model (CW current regulator too). Now at 7.2V input I am getting 130mW at 430mA using 405G1 glass lens! Still under xj-A130 or xj-A140 specs from other forum members! Trying to increase input voltage increased the current. When reached 500mA/8V diode died instantly!
I want to mention that booth drivers used are CW, and with other diodes are working - red, blue (405nm) and IR - without any problems.
In the afternoon I will try to take some pictures from diodes I received. On the back side it has a stamp. Maybe someone can recognize them and confirm or infirm my doubt: are those diodes A130, or A140 or ARE NOT 445nm diodes and seller sent to me by mistake some 405nm diodes!
Regards,
Alx
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