  Simultaneous laser locking of IR and UV lasers to a visible stabilized
reference laser is demonstrated via a Fabry-Perot cavity. LabVIEW is used to
analyze the input and an internal PID algorithm converts the Fabry-Perot signal
to an analog locking feedback signal. The locking program stabilized both
lasers to a long term stability of better than 9 MHz, with a custom-built IR
laser undergoing significant improvement in frequency stabilization. The
results of this study demonstrate the viability of a simple
computer-controlled, non temperature-stabilized Fabry-Perot locking scheme for
our application, laser cooling of Ca+ ions, and its use in other applications
with similar modest frequency stabilization requirements.
