High power diode lasers or semiconductor lasers are the basis of modern all solid state lasers (ASSLs), its wavelength now could extend from UV to 2 micometer. However, we could find that its wall-plug efficiency strongly depend on wavelength and peak at 9xxnm, for example, 940nm & 976nm for Yb doped fiber pumping, when the wavelength shorter or longer than 9xxnm, its efficency will begin to drop, hence, 70% efficiency could be got by commercial products at 9xxnm, lower at 808nm (
Have a look at the following article which may lead to a probable answer.
https://www.researchgate.net/.../Power-and-Wall-plug-efficiency-for-a-50-fill-factor-975...
Wall-plug Efficiency is the measure of how efficiently a laser source is converting electrical power into optical power. Even though, often a constant value of wall-plug efficiency is associated with a laser, in reality it varies significantly with the optical power output. The laser wall-plug efficiency also has high variance with change in temperature. Therefore, it is crucial to understand and take this variance into consideration for optimal laser performance.
Rajib Biswas Thank you! Dear Rajib, I have failed to link the article you mentioned, by reading similiar articles, I guess the internal loss should be main cause?
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