Recent content by pallab

thanks for your input. there is a constraint in our setup. the controller is far from the sensor (but not more than 3m) and a BNC connector has been used to connect two cables to connect the photodetector and the controller. We suspect this is one source of problems. would you explain, what...

two plots are the responses of the locked laser. What are the possible reasons behind the drift or oscillation-like result? I have tried different PID parameters but have not been able to get rid of the drift completely.

After adjusting the PID parameters I have got this response plot. the magnitude is not crossing the 0dB line. Is there any issue? PID is locking the laser.

Yes, I have locked the laser, but I don't want to tune the PID using the trial-and-error method. I have gone through a few links as well but could not able to relate them to the mentioned plot. And I am assuming that for perfect tuning, there will be a corresponding amplitude and phase curve and...

No, I do not have that thesis copy.

I am trying to stabilize the laser by locking it to a transition peak with the help of the PID controller. On the controller frequency response plot if I change any parameter of the P,I or D the amplitude or phase response changes. I do not know how to read the graph of the transfer function...

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.