> 50%? I think that is physically impossible, due to the nature of a > population inversion.
http://www.rp-photonics.com/diode_bars.html has a paragraph on power efficiency. the practical limit of efficiency has more to do with interaction cross sections of excitation source with gain medium (in the case of diodes is very high), and gain medium with oscillating modes (also high with diodes). the ultimate conversion limit is the quantum efficiency of the specific set of electronic transitions in question; in semiconductors, these can be tailored in construction of the diode emitting area. in laser pumped lasers, conversion efficiency can be 80% optical to optical. --- On Sat, 10/22/11, Viesturs Lācis <viesturs.la...@gmail.com> wrote: From: Viesturs Lācis <viesturs.la...@gmail.com> Subject: Re: [Emc-users] Laser diode for engraving To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Date: Saturday, October 22, 2011, 10:11 AM 2011/10/22 Jon Elson <el...@pico-systems.com>: > charles green wrote: >> most diodes can actually hit 30%-50% electrical to optical efficiency. >> > 50%? I think that is physically impossible, due to the nature of a > population inversion. Thanks, guys, for Your input! I think that I found acceptable solution, this seller has reasonably priced lasers and seems that they provide complete solution, which just needs to be connected to 12 VDC power: http://stores.ebay.com/electronictoysshop Their webpage: http://www.kalecnc.com/ With regards to laser efficiency, these are power consumption data for their 0,7W laser: Operating Current : 1100 mA Operating Voltage : 10 - 12 Vdc As You can see, it is below 10%. Viesturs ------------------------------------------------------------------------------ The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
