Table of Contents
How to change the Rb vapor cell set point temperature.
Follow these instructions to change the temperature of the vapor cell for the day 2 study of thermal doppler broadening.
On the left side of the Laser Diode Controller you will find the Cell Temperature controller as shown in Picture #1. The illuminated display shows the current temperature of the vapor cell in degrees C. There are 4 push buttons along the bottom of the controller as shown; Menu, Up, Down, and Enter.
Picture #1
Press the Menu button once to bring up the Set Point 1 (SP1) menu as shown in Picture #2.
Picture #2
Press the enter button to bring up the current set point temperature as shown in Picture #3. You can now use the up and down arrows to change the set point temperature. Note that the buttons sometimes do not respond immediately. Pressing and holding the up or down arrow button will cause the set point temperature to begin incrementing in the last digit, but it will quickly switch to the higher digits making it easy to over shoot your target. Single presses of the buttons is recommended.
Picture #3
When you have reached the desired set point temperature setting, pressing the enter button will store the new setpoint, press the menu botton to bring up SP2 as shown in Picture #4. DO NOT ENTER A VALUE FOR SET POINT 2! Just press the menu button again to move to the next menu CNFG as shown in Picture #5, DO NOT ENTER THE CNFG MENU, simply press the menu button again to get back to RUN mode as shown in Picture #1.
Picture #4
Picture #5
At this point you should see the temperature of the vapor cell slowly begin changing to match the new set point value.
Since the vapor cell is encased in an insulated oven, it heats up faster than it cools down. It can take up to 15 minutes to heat up to a new temperature, and 45 minutes to cool down to room temperature. Be patient and wait for the vapor cell to come to equilibrium at the new temperature before collecting more data.