Recent content by einstein1921

  1. E

    Graduate The unit of atom scattering factor

    Hi, I read in some papers which say the unit of atom scattering factor is e/atom. what is the meaning of that? thank you!
  2. E

    Graduate Can we make a circular polarization laser directly?

    thank you,why linear polarization pump don not induced birefringence in the gain medium?
  3. E

    Graduate Can we make a circular polarization laser directly?

    Now,we get the circular polarization photon using 1/4 waveplate, can we make a circular polarization laser directly through Stimulated Emission Radiation? or, when a electron transition from one level to another level,what kind of polarization of the photon, linear or circular? thank you!
  4. E

    What is program used in ray tracing simulation?

    what is program used as attached.thank you!
  5. E

    Undergrad What happen when monochromatic light irradiated on reflective grating

    still no idea! I am stupid!
  6. E

    Undergrad What happen when monochromatic light irradiated on reflective grating

    what happen when monochromatic light irradiated on reflective grating? where is the light will be? what is the pattern like? thank you very much! best wishes!
  7. E

    Graduate Question about toroidal mirror

    thank you for your answer!how to use toroidal mirror to collimate the beam from a point source?
  8. E

    Graduate Question about toroidal mirror

    http://www.lasertechn.com/index.php/toroidal-mirrors in the figure, what does S’s – for the sagittal plane means? the distance between the image point and the sagittal plane ?? I see in some papers,they use toroidal mirror to collimate the beam from a point source, how does this happen and...
  9. E

    Graduate Does Diffracted Light Need to Be Focused or Collimated on CCD?

    what I want to build is a EUV spectroscopy!
  10. E

    Graduate Does Diffracted Light Need to Be Focused or Collimated on CCD?

    What is difference between the plane of CCD and the position of CCD chip ? where does the light should be attack? what I want to build is a EUV spectroscopy!
  11. E

    Graduate Does Diffracted Light Need to Be Focused or Collimated on CCD?

    Does CCD have itself focus system?
  12. E

    Graduate Does Diffracted Light Need to Be Focused or Collimated on CCD?

    If I want to design a spectrograph , I need plane grating ,colimator, focus mirror. what confused me is where should I place the CCD?
  13. E

    Graduate Does Diffracted Light Need to Be Focused or Collimated on CCD?

    If I want to design a spectrograph , I need plane grating ,colimator, focus mirror. what confused me is where should I place the CCD?
  14. E

    Graduate Does Diffracted Light Need to Be Focused or Collimated on CCD?

    The question could be stupid,but It really confused me. when we capture spectroscopy using reflected grating and CCD, Does the diffracted light must be focused on the plane of CCD (using a plane grating),or it must be collimated to arrive the CCD.
  15. E

    Graduate Synchrotron X-ray Measurements

    thank you sir,I have read the materials on the website! how do they measure x rays? after the measure, they should use them,but where is the measurement intruments. Does they block the x ray or they are removed?