Re: [Vo]:Acoustic demonstration of beats

[Jones Beene]

   AlanG wrote:  
 
  > Recent progress in THz lasers has made the heterodyne laser technique moot:
 
 https://phys.org/news/2020-06-breakthrough-multi-watt-terahertz-lasers.html
 
 
 
Have you been able to buy one?

  

Re: [Vo]:Acoustic demonstration of beats

[AlanG]

Recent progress in THz lasers has made the heterodyne laser technique moot:

https://phys.org/news/2020-06-breakthrough-multi-watt-terahertz-lasers.html


On 10/13/2020 12:21 PM, JonesBeene wrote:


The beat frequency they were after  was in the THz range and this was 
 in order to fit Hagelstein’s theory of optical phonons –


… and yes - small gain was seen.

However, in the  earlier similar work without beat frequencies – 
single laser only - much higher gain (order of magnitude more) has 
been reported by Letts/Cravens.


The reproducibility was apparently better in the later experiments - 
 but I  do not think the lower  result with the beat frequency is 
leading anywhere.


*From: *H LV 

Beat frequencies of two lasers irradiating a surface appear in

_Stimulation of Optical Phonons in Deuterated Palladium_ by Dennis 
Letts and Peter Hagelstein


https://www.lenr-canr.org/acrobat/LettsDstimulatio.pdf

Harry

RE: [Vo]:Acoustic demonstration of beats

[JonesBeene]

The beat frequency they were after  was in the THz range and this was  in order 
to fit Hagelstein’s theory of optical phonons – 

… and yes - small gain was seen.

However, in the  earlier similar work without beat frequencies – single laser 
only - much higher gain (order of magnitude more) has been reported by 
Letts/Cravens.

The reproducibility was apparently better in the later experiments -  but I  do 
not think the lower  result with the beat frequency is leading anywhere.



From: H LV

Beat frequencies of two lasers irradiating a surface appear in   
_Stimulation of Optical Phonons in Deuterated Palladium_ by Dennis Letts and 
Peter Hagelstein 
https://www.lenr-canr.org/acrobat/LettsDstimulatio.pdf

Harry