I have a consideration about this "power versus speed" thing ..... Premise that i'm not a burner maker, anyway i'm working with lasers from "a little while"
, so, maybe isn't completely wrong
That what i mean, basically, is that the writing speed also have to do with the lenght of the pulses you shoot from your diode, and that the diodes that have a certain maximum level of power and mW in CW mode, can easily doubled and more, in pulsed mode, like the normal leds (well, ok, not exactly like a normal led, i know).
So, if, for example, at, say, 4x, you need to shoot pulses of 1ms at 100mw for write the disk (the numbers are indicative, i don't have way for measure the real ones), for write at 8x, you need to shoot pulses at 0.5ms, but this way you can drive the diode at 200mW ..... so, there's a risk, maybe, that dismantling a more high speed sled, you just find a diode of the previous serie, just drived with an optimized driver and better cooled ?
I know it's not so easy, there's also to considerate the collective medium time of working respect the pulsed power, duty cycles, and so on, but as example, i have some phr803 sleds i'm experimenting with, and powering the diode at just 85mA
on the sled, it become really too much hot in few time, for a long work like a reader have to do, so probably the diode in the normal use is drived at very less power of the maximum that it can hold ..... and this drive me to think that, also some burners sleds, does the same, mean, increasing the speed, just increasing the power and optimizing the driver.
It's just a personal reflection ..... anyway, cause i've never found a single part number on these diodes, i suppose there's no way for get datasheets and be sure about that :thinking:
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