Laser system for rydberg gates based on tapered amplifier driven frequency doubler.

Abstract

In this thesis project, effort is concentrated on realizing a 480nm laser system which allows one to excite atoms into Rydberg states with principal quantum number n>>1 for quantum information processing experiment. A 960nm interference-stabilized external-cavity diode laser (ECDL) has been realized. The output power of this laser is amplified by a tapered amplifier to more than 1W. The output of this 960nm laser system is then resonate in a bow-tie cavity resonator to enhance the fundamental beam circulating in the nonlinear crystal to convert the 960nm light to 480nm light.

A microcontroller based PI (Proportional-Integral) temperature controller has been realized. The controller enable one to have a constantly updating information of target system temperature using LCD display. It also allows one to be able to store the value of the temperature set point, PI constant or current set point in an external memory chip. This controller is found to able to stabilize the target system temperature within +/- 0:001 degree Celsius.