Recent content by pallab

I am looking for a high-voltage DC power supply (1K volt & 10mA) for the Hamamatsu L2783-70NE-Yb hollow cathode lamp. Please suggest me some power supply for the lamp. I have found one from the Standford Research System but looking for other options which is suitable for the lamp-related experiment.

I am looking for the thesis Frequency stabilized solid-state lasers for coherent optical Communications by Day, Timothy. I am working with laser stabilization so can anyone share this thesis? I am trying to understand the basic of this topic. This thesis is suggested by others but failed to get...

Project: spectroscopic studies on Eu3+/Yb3+ doped Y2O3 phosphors Yes, I am clueless but I am trying to fathom out the physics behind this luminescence. what I was considering as true for this luminescence, faced a challenge to the result of UV light excitation

physics

I have seen that Eu3+/Yb3+ doped phosphor emitting reddish light while excited with NIR laser. and it stopped emission immediately the laser turned off. So my thought was that it is a fluorescence. though for the 5D0--->7F2 transition it was excited with UV light, not with NIR laser. then I...

Thanks for your reply

As it is mentioned fluorescence is a singlet to singlet transition and this is the reason that fluorescence is a fast process. now consider the Eu doped phosphor material where 5D0--->7F2 and other transitions show the prominent intensity peaks in down-conversion process. those are not singlet...

no difference but I was thinking maybe k-K is the conventional one rather than k+K to use in this case or maybe there is "something special" with the k-K choice.

why the general wave vector q (in the proof of Bloch theorem in Ashcroft Mermin) is represented by k-K, where k is in the 1st BZ ? why not q=k+K ( usual vector form) what is special about k-K?

the answer is NE^0.5 but my answer is E^0.5N the # of state is Ω=( one particle phase-space volume)^N one particle phase-space volume=integration of dq*integration of dp from space part dq I get V and dp is converted into Energy E variable via E=p^2/2m

for the case, r>>r' the higher-order term like 1/r^2 and above that is negligible. so V(r)=cons.*1/r*P0(cos a) but for the case r'>>r will it be V(r)=cons.*1/r'[ summation Pn(cos a')t'^n] where t'=r/r' now if we neglect higher-order term of r/r' then V(r)=cons.*1/r'*P0(cos a') which is...

the question that can we express Pauli's 2x2 matrices for spin 1/2 in higher-order matrices, say 3x3, 4x4 arose in my mind.

What are the rules to write Pauli's spin matrices in higher-order matrices (especially in 4x4 matrices)

what are Dirac's gamma matrices . especially , does it have many forms?

please refer me a good book for the Matlab beginner.