cavity lock electronics n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
CAVITY LOCK ELECTRONICS PowerPoint Presentation
Download Presentation
CAVITY LOCK ELECTRONICS

Loading in 2 Seconds...

play fullscreen
1 / 10

CAVITY LOCK ELECTRONICS - PowerPoint PPT Presentation


  • 89 Views
  • Uploaded on

CAVITY LOCK ELECTRONICS. Dan Sexton, Sirish Nanda, and Abdurahim Rakhman. Design Goals. Lock-In on Cavity Resonance Slow and Fast Laser Frequency Scan Slow and Fast Error Compensation Incorporate on board micro-controller Compatible with Stanford Research SIM900 Crate. Beam Splitter.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'CAVITY LOCK ELECTRONICS' - chad


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
cavity lock electronics

CAVITY LOCK ELECTRONICS

Dan Sexton, Sirish Nanda, and Abdurahim Rakhman

design goals
Design Goals
  • Lock-In on Cavity Resonance
    • Slow and Fast Laser Frequency Scan
    • Slow and Fast Error Compensation
    • Incorporate on board micro-controller
    • Compatible with Stanford Research SIM900 Crate
system schematic

Beam Splitter

Tunable Laser

Cavity

Oscillator

PID-Regulator

Photo detector

Phase Shifter

0

Error signal

Mixer

Low Pass Filter

System Schematic
  • Keep the cavity resonate forever
  • It is very hard to stabilize the cavity length in nm level

Pound-Drever-Hall Locking Scheme

  • Detect phase of the resonance from reflected light
  • Feedback to tunable element to stay “locked” to resonance
electronics overview
Electronics Overview
  • Slow and Fast Laser Frequency Scan
    • Search for Signal of Interest
      • Slow Scan Rate – 0.01 Hz – 1Hz
      • Fast Scan Rate – 3 Hz – 30Hz
    • External Modulation
      • 10-30 mV @ 1MHz Signal
    • Error Input and Output
      • Polarity Selection (+/-)
electronics overview cont d
Electronics Overview (cont’d)
  • Slow and Fast Error Feedback
    • Integration and Gain Control Loops (PI)
      • Gain Range – x0.1 – x1
      • Integration Time – 1mS – 10mS
  • Optional Features
    • Trigger Monitor or Input
    • Threshold Monitor or Input
electronics overview cont d1
Electronics Overview (cont’d)
  • Analog Devices ADuC-70xx series Micro-Controller
    • 32-Bit 44MHz ARM processor
    • 8 ADC CHs and 4 DAC CHs
    • Drop in module in two different packages
      • Option A – OLIMEX Evaluation Card

ADuC-7026 (3” x 3”)

      • Option B – OLIMEX DIP Socket

ADuC-7020 (1” x 2”)

electronics overview cont d2
Electronics Overview (cont’d)
  • Stanford Research SIM900 Crate
    • Off the shelf “Modular System”
    • GPIB and RS-232 interface
    • Regulated Power Supply
current status
Current Status
  • PCB and enclosure in hand and assembled
  • Bench Testing completed
  • In System Calibration Beginning