Chris Bohr

7 Questions 4 Answers 0 Followers

Questions related from Chris Bohr

Why nobody talks about the momentum mismatch of bulk phonon polariton as they do in surface phonon polariton?

Why nobody talks about the momentum mismatch of bulk phonon polariton as they do in surface phonon polariton? Thanks!

15 September 2024 8,924 3 View

What is the displacement of A1g and Eg Raman modes of SrTiO3 in tetragonal phase?

Hi, I am wondering if anyone who is familiar with Raman spectroscopy/group theory can help me with the displacement of A1g and Eg Raman modes of SrTiO3 in tetragonal phase. Thanks in advance!

21 August 2024 2,771 2 View

Weird noise from Newport Nirvana photodetector?

Hi guys, I am now using Newport Nirvana balanced photodetector and measuring with a locking at 250 Hz. The background noise (connected to the power supply but with the switch is off) is huge...

01 August 2024 8,589 0 View

COMSOL simulation of transient wave optics propagation is not physical?

Hi guys, I am trying to simulate a 1 ps long plane wave propagating in a dispersive material, with the wave optics transient module. According to the drude-lorentz model, when the frequency of...

30 June 2024 644 1 View

How long can an Ultrafast amplifier (Solstice or Astrella) work continuously?

It is hard to find such parameters. I know it can work at least 2 weeks continuously. Has anyone tried longer? really curious about the limit.

28 February 2024 5,038 1 View

Quarter waveplate can't be calibrated for electro-optical sampling?

Hi, I am recently having an issue to calibrate the quarter waveplate for the electro-optical sampling purpose. I can balance the detector for one polarization (e.g., 0 degree) but then to 45...

08 August 2023 7,477 1 View

Suggestions about aligning the telescope for THz?

It is quite challenging to build a telescope of terahertz beam as it is invisible. Can anyone give some suggestions so that the lab life can be easier?

21 June 2022 9,768 3 View