A $4\pi$ Fluorescence Detection Region for Collinear Laser Spectroscopy

TL;DR

This paper introduces a novel fluorescence detection system for collinear laser spectroscopy that achieves nearly 4π solid angle coverage using curved mirrors, enhancing photon collection efficiency and stray light suppression.

Contribution

The paper presents a new detection system employing curved surface mirrors and angular filters, significantly improving fluorescence photon collection in collinear laser spectroscopy.

Findings

Achieved nearly 4π solid angle photon detection

Demonstrated system effectiveness at two spectroscopy setups

Enabled investigation of $^{36}$Ca with high detection rates

Abstract

We report on a novel detection system for collinear laser spectroscopy which provides an almost $4\pi$ solid angle for fluorescence photon detection by employing curved surface mirrors. Additional parabolic angular filters offer passive stray light suppression and can be configured to match the experimental conditions. The mirror surfaces have an excellent reflectivity over a broad band of wavelengths in the optical spectrum and can be substituted to expand the wavelength acceptance range even further. Experiments with this system were performed at two collinear laser spectroscopy setups, including the laser spectroscopic investigation of $^{36}$Ca using rates of 25/s at NSCL, MSU.