Frequency evaluation of collimated blue light generated by wave mixing in Rb vapour

TL;DR

This paper evaluates the frequency stability and tunability of collimated blue light generated via wave mixing in rubidium vapor, demonstrating a tuning range over 100 MHz and a stabilization technique.

Contribution

It introduces a method to evaluate and stabilize the frequency and power of blue light generated in rubidium vapor, with a tunability of over 100 MHz.

Findings

CBL tuning range exceeds 100 MHz around specific Rb transition

A simple stabilization technique achieves power stability within a few percent

Frequency stabilization within 10 MHz is demonstrated

Abstract

An evaluation of the absolute frequency and tunability of collimated blue light (CBL) generated in warm Rb vapour excited by low-power cw laser radiation at 780 nm and 776 nm, has been performed using a Fabry-Perot interferometer and a blue diode laser. For the conditions of our experiments the CBL tuning range is more than 100 MHz around the resonant frequency of the 85Rb 5S1/2 (F=3) to 6P3/2 (F'=4) transition. A simple technique for stabilizing the power and frequency of the CBL to within a few percent and 10 MHz, respectively, is suggested and demonstrated.