Laser Diode Calculator

Contains specifications of several commercial lasers and allows the user to calculate far field divergence angles and near field spot size values for typical laser diodes One of the main uses of this calculator is to lookup or calculate values to use in the custom pattern generator since most laser diode specifications list far field divergence in degrees while Optiscan works with the spot size in meters. The custom pattern generator can then be used to generate a realistic laser diode source.

Getting Started:

The Laser Diode Calculator can be accessed through the Accessories menu or from the Custom Pattern Panel.

Notes:

  • when you change the wavelength all values are recalculated assuming that the near-field spot fwhm is constant
  • when you change any X value the other three X values are re-calculated to match your input
  • when you change any Y value the other three Y values are re-calculated to match your input
  • X direction is parallel to the junction
  • Y direction is perpendicular to the junction

Buttons:

  • New Laser Button: Clears the edit boxes
  • Save Laser Button: Saves current values of the edit boxes
  • Delete Laser Button: Deletes the current laser (as shown in the drop down menu)

Parameters:

  • Name: name of the laser
  • Wavelength: wavelength of the laser in meters.
  • Astigmatism: axial astigmatism of the laser in meters
  • X FWHM Far Field: X direction Full Width Half Maximum of the laser in degrees for a Gaussian distribution
  • X FW 1/e^2 Far Field: X direction Full Width 1/e^2 of the laser in degrees for a Gaussian distribution
  • X Spot FWHM: X direction Full Width Half Maximum of the spot in meters for a Gaussian distribution
  • X Spot FW 1/e^2: X direction Full Width 1/e^2 of the spot in meters for a Gaussian distribution
  • Y FWHM Far Field: Y direction Full Width Half Maximum of the laser in degrees for a Lorentzian shape
  • Y FW 1/e^2 Far Field: Y direction Full Width 1/e^2 of the far field in degrees for a Lorentzian shape
  • Y Spot FWHM: Y direction Full Width Half Maximum of the spot in meters for a decaying exponential shape
  • Y Spot FW 1/e^2: Y direction Full Width 1/e^2 of the spot in meters for a decaying exponential shape

Example

See Also: