Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the database of laser pointer companies. The link will open in a new window for your convenience.

 Laser Pointer Forums - Discuss Laser Pointers Question about analog modulation on a lab laser Laser Pointer Company Database     Laser Top Sites List     Lasers by Type     Green Lasers

01-23-2012, 06:51 PM #1
 Class 2M Laser Join Date: Sep 2011 Location: Long Island, NY Posts: 832 Rep Power: 33
sopark4000
Class 2M Laser

Join Date: Sep 2011
Location: Long Island, NY
Posts: 832
Rep Power: 33
Question about analog modulation on a lab laser

Ok I just recently purchased an 1,800mW 532nm lab laser from Meierlight.com and the analog modulation works by connecting 5V to input wires so 5V equals max power, 2.5V equals half power and 0V equals off. What I'm wondering is how many amps will this wire be able to handle because I actually have a very small variable voltage power supply that can output 0-15V at a constant 1Amp. Do I need lower current, is that 1Amp going to be too much power? I tried checking there website and asking them and unfortunately there english isn't great. All help is appreciated.

__________________
MY LASERS
Dragon Lasers- 532nm viper 35mW output=67mW
Dragon Lasers- 532nm Hulk 100mW output=213mW
Laserglow- 532nm lab 2,500mW output= 2,573mW
Meierlight- 532nm lab 1,800mW output=2,000mW+
Survival Laser- 445nm 1-1.3W output= 1,153mW
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 2,000mW+Power graph
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 1,634mW Power graph
Danefex-445nm Minisabre V2 output=1,736mW
SkyraySR5-445nm 2W diode and host from DTR output=2,231mW
DIY bench top- 650nm in mini cylindrical CPU heat sink. Diode from lazerer. Focusing ring from FlaminPyro Output=304mW
DIY bench top- 635nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from Flaminpyro. Output=I've pushed it to 576mWPower graph
SkyraySR5-635nm 300mW diode from DTR output=
DIY bench top- 405nm in cylindrical CPU heat sink 12X diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 552mWPower graph
Lazerer- 405nm Rifle 500mW. Actual output=551mW
DIY 40W Co2

Last edited by sopark4000; 01-23-2012 at 06:57 PM.

01-23-2012, 07:13 PM #2
 Class 4 Laser Join Date: Nov 2008 Posts: 5,736 Rep Power: 395
ElektroFreak
Class 4 Laser

Join Date: Nov 2008
Posts: 5,736
Rep Power: 395
Re: Question about analog modulation on a lab laser

The modulation input requires negligible current, only voltage. In other words you can use very small wire for modulation.
__________________
Laser Resources (for n00bs and veterans alike!)

Sam's Laser FAQ (The Laser Bible)

http://www.repairfaq.org/sam/laserfaq.htm

RP Photonics Encyclopedia of Laser Physics and Technology

http://www.rp-photonics.com/encyclopedia.html

ULTIMATE DIY PROJECTOR REFERENCE

http://nqlasers.com/scannerreference...itle=Main_Page

SUCCESS is the best revenge.

01-23-2012, 07:18 PM #3
 Class 3B Laser Join Date: Nov 2008 Location: Germany Posts: 4,239 Rep Power: 292
Elektrotechniker
Class 3B Laser

Join Date: Nov 2008
Location: Germany
Posts: 4,239
Rep Power: 292
Re: Question about analog modulation on a lab laser

Modulation only draws a few mA.
The psu you got is a variable voltage power supply that can provide a max of 1 A as you said.
The modulation will draw as much current as it needs, thus those few mA.
As long as you keep the psu's output voltage between 0-5 V it will be just fine.
Don't try it yet though. This is that's a logical way to see it, but I may be totally wrong, as I haven't tried modulating a dpss via a psu before.

EDIT: EF beat me to it.

Last edited by Elektrotechniker; 01-23-2012 at 07:19 PM.

01-23-2012, 08:28 PM #4
 Class 2M Laser Join Date: Sep 2011 Location: Long Island, NY Posts: 832 Rep Power: 33
sopark4000
Class 2M Laser

Join Date: Sep 2011
Location: Long Island, NY
Posts: 832
Rep Power: 33
Re: Question about analog modulation on a lab laser

Ok thanks for the info guys. I'll do some testing with a multimeter and a test load just to make sure that It is only supplying low current and not 1A. I was just worried that wether it was set to 1V or 15V that it would give a constant 1A.
__________________
MY LASERS
Dragon Lasers- 532nm viper 35mW output=67mW
Dragon Lasers- 532nm Hulk 100mW output=213mW
Laserglow- 532nm lab 2,500mW output= 2,573mW
Meierlight- 532nm lab 1,800mW output=2,000mW+
Survival Laser- 445nm 1-1.3W output= 1,153mW
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 2,000mW+Power graph
DIY bench top- 445nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 1,634mW Power graph
Danefex-445nm Minisabre V2 output=1,736mW
SkyraySR5-445nm 2W diode and host from DTR output=2,231mW
DIY bench top- 650nm in mini cylindrical CPU heat sink. Diode from lazerer. Focusing ring from FlaminPyro Output=304mW
DIY bench top- 635nm in cylindrical CPU heat sink. Diode from DTR. Focusing ring from Flaminpyro. Output=I've pushed it to 576mWPower graph
SkyraySR5-635nm 300mW diode from DTR output=
DIY bench top- 405nm in cylindrical CPU heat sink 12X diode from DTR. Focusing ring from FlaminPyro. Output=I've pushed it to 552mWPower graph
Lazerer- 405nm Rifle 500mW. Actual output=551mW
DIY 40W Co2

01-24-2012, 12:31 PM #5
 Class 3R Laser Join Date: Aug 2009 Location: The Netherlands Posts: 1,482 Rep Power: 61
Bluefan
Class 3R Laser

Join Date: Aug 2009
Location: The Netherlands
Posts: 1,482
Rep Power: 61
Re: Question about analog modulation on a lab laser

U = I*R

The modulation input is VERY likely high impedance, so a high R. I'd guess 1k or higher. Take a fixed input voltage U and the current I flowing will be low. It's very much impossible to have a huge current at a low voltage with a high resistance load. If you want to have 1A into 1kohm you'll need 1000V. Not gonna happen spontaneously.
__________________
Highlights of my laser collection:
Big Sky Er:YAG - HP 8168D 1480-1570nm tunable laser source - Spectra Physics 3800 modelocked Nd:YAG - lots of IR diodes and bars - LPC-815 200mW 650nm - DL 6353TL 635nm 5mW - HP5501A stabilized HeNe - 2x Melles Griot 05-STP-910 stabilized HeNe - Spectra Physics 3500 Dye laser - REO 30536 543nm 2mW - Coherent DPY315-100 532nm 100mW SLM DPSS - Lexel 85 - 3x B&W tek 10mW 473nm - 445nm 3W Bluefan Sabre module - SF-AW210 150mW 405nm - DPSS inc 355nm 100mW Q-switched

Power meters:
Laser precision RkP-575 w/ RK-5710 - Ophir 10A-V2-SH - Ophir OEM 20C-A - HP 8152A w/ 2x 81521B - Coherent 212 - Anritsu ML93 w/ MA98A - 2x laser precision AM-400 - Leader LPM-8000

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT. The time now is 11:27 AM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointer Forums - Archive - Top