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d2:spectroscopy_module_210

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d2:spectroscopy_module_210 [2019/06/25 22:53]
Michael Radunsky [Inputs, Outputs, and Controls]
d2:spectroscopy_module_210 [2020/03/16 15:17] (current)
Michael Radunsky [Theory of Operation]
Line 72: Line 72:
 The remaining portion is passed through a fixed λ/2 waveplate and PBS to split off the pump beam from the probe beam.  The pump beam is directed to the Output Optics assembly where it is combined with the probe beam on a PBS in a counter-propagating configuration. The pump beam is dumped through the reflection port of the PBS that separated the pump and probe and terminates on the wall of the housing.  The probe is detected on the signal photodiode. The remaining portion is passed through a fixed λ/2 waveplate and PBS to split off the pump beam from the probe beam.  The pump beam is directed to the Output Optics assembly where it is combined with the probe beam on a PBS in a counter-propagating configuration. The pump beam is dumped through the reflection port of the PBS that separated the pump and probe and terminates on the wall of the housing.  The probe is detected on the signal photodiode.
  
-The beam diameters were designed to provide enough photocurrent (~50-100μA) to give shot-noise-limited performance out to 5 MHz while limiting saturation broadening.  For Vescent's DBR lasers, the bandwidth is useful to provide for tight and stable locking by feedback to injection current.  +The beam diameters were designed to provide enough photocurrent (~50-100 μA) to give shot-noise-limited performance out to 5 MHz while limiting saturation broadening.  For Vescent's DBR lasers, the bandwidth is useful to provide for tight and stable locking by feedback to injection current.  
  
  
d2/spectroscopy_module_210.1561528435.txt.gz · Last modified: 2019/06/25 22:53 by Michael Radunsky