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THANK YOU!! :D that brings me to the next question. should i use a single mode fiber or a multi mode fiber( as a trade off of resolution and intensity) in an experiment where i scan an optical fiber across the laser beam to measure the intensity distribution ?... and what happens if i propagate...

and how does a single mode look like?

how do i know from a picture?

well i cant post a picture but it is the typical red laser pointer the key chain laser pointers. another thing, i am doing an experiment to measure the intensity distribution of the beam by scanning an optical fiber across the beam. should i use a single mode fiber or a multi mode as a trade...

hello everyone, can someone help me and tell me is the red laser diode in the laser pointer a multimode or a single mode? the wavelength is around 632nm and i am actually trying to figure out whether to use a multimode or a single mode.

Re: LD Driver help anyone

Re: LD Driver help ok i think i figured it out. now when i measure the output current from the circuit without the dummy circuit, it measures 30 BUT NOT MA, micro amp and when i measure the voltage across the 1 ohm resistance using the test load it measure 30mv. shouldn't 30mv equal to 30ma...

Re: LD Driver help first of all, thanks for replying ofc i want to share my experience with everybody and laserbee was of gr8 help. the problem is that i posted the other thread in the wrong section, so i thought i would post in the right section to get more answers. the circuit is on a...

hi i followed the diagram for the driver on the website www.rog8811.com/laserdiver.htm and the circuit is working and i measure the mv across the 1 ohm resistor and it measures 26mv which is equal to 26ma ( the current the laser diode will see). it laso measure 2.9 v across the diodes in the...

guys i need some help and i really hope someone can help me. i need to buy a red laser diode but i live in egypt and i have a project to submit in a week and a half. i was wodnering if any one knows about the fastest way to ship some laser diodes to egypt in less than a week ? or any one has...

yes yes i did that.. dont worry but still it didnt work. i honestly dont know what is wrong. i connected the tes load , measure the mv acroos the 1 ohm resistor and it was at first 26mv. i discharged and everything then i connected the laser diode but nothing worked, i tried to increase the...

oh nvm u were right. 1 and 2 bad news :S i connected everything and i checked that the diode will see 30 ma then i discharged and everything and i connected the diode but it didn't work. ofc if it is doesnt work this means it is burned right ?

when u said pins 1 and 2.... i think u meant 1 and 3 right ? and 1 is the negative and 3 is the positive right ?

dude, i seriously cant thank you enough :D. u are like my idol right now. THANK YOU i am using 2 x10 ohm( giving only 5 ohm in total ) as a fixed resistance... should i just change the 2x10 with one 27 ? ok just going over the steps: 1- disconnect the dummy circuit 2- connect both wires...

i know i ask a lot of stupid questions but i only have one laser diode and i have to submit the project in less than a week and i live in egypt ( they dont sell laser diodes here). i am pretty much screwed if the laser diode burns. 3 questions : 1- some people told me that this laser diode i...

anyone plz?

ok thanks a lot man, it is working now. however, i still have a problem when i measure across the diodes it gives 2.9 v and the operating voltage is 2.3 and max of 2.6. how can i reduce this 2.9 to like 2.3 or 2.5?

yes it is 1 ohm and i am sure it is across the 1 ohm. i am not what u mean by what scale if u mean mv or V i used mv when i measure across the 1 ohm and volts across the diodes. about the direction of the diode, is the little gray circle the positive or negative?

i measured tat the vout and adj and i got 1.25v but when i connect across the 1 ohm resistance i get zero and across the 4 diodes i get max 0.87 v and voltage supply is 9v

the one i attached but i added another 10 ohm to get a total of 5 ohm and i am using a 100 ohm pot but as i said i need 35- 45 ma for the circuit so thats 1.25/35-45ma and 2.3-26 volts operating voltage