Recent batch of 455nm 500mW laser diodes made available on YKW ...

[drlava]

at 34 feet:

the white oval above was from a flashlight to trick the camera exposure for the laser dot.

[allthatwhichis]

The only real problem I have with my projector is the blue's "beam data". It is approx 4mmx26mm, or 1/6 an inch by 1 inch at about 60 feet. I only see one lense on it. I took it this was a common problem with 445nm diodes.

[heroic]

at 34 feet:

the white oval above was from a flashlight to trick the camera exposure for the laser dot.

Is that ruler inches or centimetres? If it's centimetres then it looks like the fat axis has 1.5 mrad divergence or thereabouts. Not bad! Definitely better than my *ugh* 635nm red.

[drlava]

That's right, it's in centimeters. And I plan to do better for the final rev.

[FourDee]

Would you please be so kind to (in due time) share your final setup with the rest of us?

[rfourt]

Hòw much power is that beam?

[allthatwhichis]

Hòw much power is that beam?

Which beam? Mine, close to 400mW after 2 dichros, a mirror and galvos. dr_lava's, good"?"

[andythemechanic]

Hallo everybody,

I tested my Diode today. Final Setup with Thorlabs C610TM-A and an anamorphic prism pair gave a 20x10mm spot in 18.7m distance. Prisms are uncoated but used at brewster angle. Losses from the prisms are 16%. My diode performs a bit underspec, threshold is at 280mA. Reason might be that I gave her a bit reverse current (unknwon current 1s ups ) at the beginning. Final output at 650mA is 370mW.
Some photos to enjoy:


The last photo shows the beam spot (bottom spot ) compared to my 200mW 473nm Lasever (top spot).

Greetings
Andreas

[LesioQ]

Andy,

Where the heck was Your dedicated Lasorb during reverse biasing the diode ??
Piotr.K

[andythemechanic]

Had only red ones left, unfortunately.
But joking aside, can reverse bias lead to just an increased treshhold while everyting else stays more or less the same? Do I have to expected the diode dying faster now? Anybody knows from experience?

Andreas