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CW vs pulsed?

darklandz

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i know the main difference between the two are down to operating mode and diode lifetime. but interms of visibility/beam brightness, which 1 is better?
i always thought CW was brighter than pulsed?
say u have two 473nm 30mw pointers, 1 CW and other pulsed.. which one would seem brighter?
also, i read somwhere that 100mw pulsed would seem equivalent to 60mw CW- is this true?
if a pulsed laser was mode-hopping, would you see tem01-02 beam changes like CW lasers?
i want a high powered blue pointer which i could use for long distance pointing. ive had a 20mw blue CW which really is beautiful, but its just not powerful enough for me, even without ambient lighting.
DL's claim their spartan BP 60mw is perfect for long distance pointing but how can i be so sure of this?
im thinking about buying the spartan BP 60mw as a tryout. im willing to pay the $1500 asked but their returns policy states u can get full refund minus shipping costs within 7 days, no questions asked.
 

Razako

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Just get a blue RPL 30 and you will get CW+true tem00 for $300 less. I have heard that most of them are actually putting out >40mw average. Try asking curiously_coherent about his.

Also The spartan bp 60mw seems to be out of stock.
 

styropyro

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To start off, some pulsed lasers are different than other pulsed lasers. Lets say that Laser X is pulsed at 300mW with a 50:50 on/off time. That means it changes on and off 50/50, so the average power would be 150mW. So a 50:50 on/off pulsed 300mW laser would look the same as a 150mW CW laser.

So if you had two 30mW blue lasers, the CW would be brighter for sure because it is always putting out 30mW, The pulsed laser would be putting out 30mW one millisecond and 0mW the next millisecond (or something along the lines of that), and it would continue that cycle. for as long as you kept the button pressed.

If it was mode-hopping, you could tell just as easy as a CW laser.

I don't know about the spartan BP though, I'm not sure if it is claiming 60mW peak or average. DL is known for sending out underspec laser you know so I would take caution when ordering from them.

Blue (473nm) lasers aren't really sold at power outputs over 30mW by compaines unless they are freaks. Maybe try building a 100mW Blu-ray from a blu-ray burner, the beam on that thing would be super bright.
 
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Actualy if you had a 30mw pulsed and a 30mw cw it would be the exact same power, they are both measured on there average power which pulsing doesnt effect it at all.

Now if you had a 100mw laser that was being ran cw and you changed that to pulse 50:50 then it would turn to a 50mw, but the advantage of this is that it can be pushed harder so you could turn it up to make it a 150mw average laser thus being more powerful than when it started.

..lazer... ;D ;D ;D
 

Razako

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Anyone know what the actual "on" time of the spartan bp is?
 

darklandz

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i am fully aware that dragonlasers kinda have a rep of sending out underspec lasers but i just wanted to tryout the spartanbp to see it for myself.
my first choice is still an RPL >40mw but Jack doesnt have any in at the moment.
someone on LPF has a >40mw blue RPL from Jack which i was about to buy.
lucky sod :D
as for 405nm, i have had a few quotes from users on LPF but theyr asking between $4-800 for a >20mw. isnt that a bit steep? i understand the diode itself costs between $2-300.
 

styropyro

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wooooooolazer said:
Actualy if you had a 30mw pulsed and a 30mw cw it would be the exact same power, they are both measured on there average power which pulsing doesnt effect it at all.
Not all lasers are rated by their average rating. Anybody could call a 30mW peak pulsed laser a 30mW laser because it is a 30mW laser, even though the average would only be ~15mW.
 

Razako

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styropyro said:
[quote author=wooooooolazer link=1204597968/0#3 date=1204599381]Actualy if you had a 30mw pulsed and a 30mw cw it would be the exact same power, they are both measured on there average power which pulsing doesnt effect it at all.
Not all lasers are rated by their average rating. Anybody could call a 30mW peak pulsed laser a 30mW laser because it is a 30mW laser, even though the average would only be ~15mW.[/quote]
I think dragon might be rating them by their peak. You will notice that the 30mw pulsed laser on dragon costs much less than a blue rpl30. In reality the 30mw spartan bp might only be the equivalent of ~20~mw cw.
Here is a quote that I found in the blue section of optotronics.

The RPL-Blue laser provides true continuous output of it's rated power, not the cheaper and less powerful
Q-switched type that is rated at the peak power of a beam that is switched on & off with a duty cycle of typically 50% or less.
 

laserjim

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We just once tested our 50mw blue laser,hope it is useful to you. the test's result is at youtube.
 




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