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Old 05-08-2017, 01:31 PM #1
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Default LASER Dimming and Life Span Question

Hello All Members

I am quite new in field of LASER.

Recently i have bought 5mW Red LASER from local market (Cheaper one).I have attached photo of it.

I am powering it with constant current power supply made by LM317.

I have noticed that at ambient temperature LASER intensity becomes 50% less when i power it up continuous for 1 day.

My questions are as following

(1) Will intensity reduce in every LASER diodes if i power it up continuous for long time say 15 days at constant current ?

(2) Suppose i have laser diode rated at 5000 Hour life span and i power it up by 50% duty cycle PWM will it increase it life?

I want to use LASER in security system so i will remains on continuously.

Looking for suggestions and advice from you!!



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Old 05-08-2017, 01:59 PM #2
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Default Re: LASER Dimming and Life Span Question

Is that the exact diode? Doesn't that already have a driver on it. I powered that exact or similar diode with an 18650 for about 5 days straight no problem
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Old 05-08-2017, 02:49 PM #3
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Default Re: LASER Dimming and Life Span Question

Quote:
Originally Posted by 10fenny View Post
Doesn't that already have a driver on it.

It does, you just need to hook up 3V or whatever voltage they need.
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Old 05-08-2017, 05:45 PM #4
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Default Re: LASER Dimming and Life Span Question

Yes exact this diode ....driver is connected extranally custom made .I don't think it has in built driver.actually it has single resistor in case.


What is your opinion on pwm Base operation of such diode ?
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Old 05-08-2017, 06:16 PM #5
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Default Re: LASER Dimming and Life Span Question

What 5mw red module did Stryo run for 5 years straight?
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Old 05-08-2017, 07:23 PM #6
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Default Re: LASER Dimming and Life Span Question

http://www.laserpointerforums.com/f5...uld-86460.html
Check out this one..by Javalin
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Last edited by GSS; 05-08-2017 at 07:25 PM.
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Old 05-08-2017, 10:30 PM #7
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Default Re: LASER Dimming and Life Span Question

Quote:
Originally Posted by 10fenny View Post
Doesn't that already have a driver on it.
Depends on if you consider a single surface-mount resistor a driver.

Quote:
Originally Posted by Chaitanya View Post
I am powering it with constant current power supply made by LM317.
And everything hinges on the answer to:

AT WHAT CURRENT??
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Old 05-09-2017, 05:24 AM #8
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Default Re: LASER Dimming and Life Span Question

Current is about 1mA approx.as we are using 10% tolerance resistor so current may vary some what ....

Yesterday I read on Internet that such cheap cost modules made using bad semiconductors so it may cause shorter life and reduced optical output with time ...

What about PWM based operation of this CW module? Will it provide any advantage like long life?
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