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 Old threads, why not lock them? Laser Pointer Company Database     Laser Top Sites List     Lasers by Type     Green Lasers

06-29-2014, 04:00 AM #1
 Class 3B Laser Join Date: Jan 2014 Location: Baghdad, Iraq Posts: 4,239 Rep Power: 2080
Class 3B Laser

Join Date: Jan 2014
Posts: 4,239
Rep Power: 2080
Old threads, why not lock them?

Why not lock old threads if some members become upset if a new post is added to them? How old is old? I accidentally posted in a thread that was just under a year old and was neg'd and insulted by a member for posting in it.

__________________

http://www.lexellaser.com/techinfo_wavelengths.htm

Laser Safety:
http://www.laserpointersafety.com/index.html

Angular Size Calculator; use with diode angle of radiation specification to calculate the needed lens diameter for a given FL:
http://www.1728.org/angsize.htm

Divergence to spot size calculator: http://tinyurl.com/spotsize - 1 mRad is about .057 degrees which from the earth would expand to be ~10% the diameters of the moon or sun at their distances.

Divergence Calculator: http://www.pseudonomen.com/lasers/ca...alculator.html - Measure your lasers beamwidth at 1 foot & then at a further distance to calculate the divergence.

Online calculator to determine spot intensity at different mRad's & powers @ distances: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: http://www.ophiropt.com/laser-measur...ity-calculator

How to build a laser beam expander to reduce divergence: http://tinyurl.com/BeamExpander

RHD's Relative Perceived Brightness Calculator. Compare brightness @nm: http://lsrtools.1apps.com/relativebrightness

YAG Power Calculator, i.e. convert ns @ mJ to peak power in watts http://tinyurl.com/YAG-Pulse

The forum costs more to run than donations received, if you wish to help click this link: http://laserpointerforums.com/donations.htm

_______

06-29-2014, 04:27 AM #2
 Class 3B Laser Join Date: Dec 2011 Location: Michigan's U.P. Posts: 4,380 Rep Power: 630
Sigurthr
Class 3B Laser

Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,380
Rep Power: 630
Re: Old threads, why not lock them?

Because occasionally the original poster or a major contributor or an expert of the field will come in with relevant and insightful data or updates. The problem with necroposting is that it is usually done by laymen posters who do not actually contribute anything at all to the thread. Asking questions is NOT contributing, it is baiting someone else to contribute, and this is what most laymen posters don't understand.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert

 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 09:35 AM.

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