Experimental demonstration of an excited-state Faraday filter operating at 532 nm

Abstract

We outline what is to our knowledge the first experimental demonstration of an excited-state Faraday filter. The filter consists of potassium vapor between crossed polarizers in a dc magnetic field and operates on the 4P((1/2)) ? 8S((1/2)) transition in potassium. The 4P((1/2)) state is populated by a linearly polarized, 10-ns light pulse from a dye laser operating at 769.9 nm. Another linearly polarized, 10-nsec pulse at 532.33 nm traverses the pumped volume of the K cell and is absorbed from the 4P((1/2)) state to the 8S((1/2)) state. The transmission of the filter is approximately 3.5% at 532.33 nm with a bandwidth of less than 10 GHz.

Subnatural linewidths in two-photon excited-state spectroscopy

“…Spectroscopy of excited state transitions is of growing interest for a variety of applications including the search for stable frequency references [1,2], state lifetime measurement [3], optical filtering [4], frequency up-conversion [5], multiphoton laser cooling [6], as well as Rydberg gases [7,8] and their application to electro-optics [9][10][11] and nonlinear optics [12]. Twophoton excited state spectroscopy can be achieved without significant transfer of population out of the ground state using electromagnetically induced transparency (EIT) [13] in the ladder configuration [14].…”

Theory and experiment for atomic optical filter based on optical anisotropy in rubidium

“…For example, Faraday anomalous dispersion optical filter (FADOF) based on Faraday effect has been extensively studied [5][6][7][8][9][10][11] and has been utilized to many practical applications, such as laser communication [12] and lidar [13], with their merits of high transmission, narrow-bandwidth and excellent out-of-band rejection. In addition, atomic optical filters based on optical anisotropy induced by another selective-polarized pumping beam were preliminarily experimentally demonstrated [14][15][16], however, the theoretical model and the analysis of filter characteristics for this category of filter have not been reported.…”

Electrodeless-discharge-vapor-lamp-based optical atomic filter

“…1). In the past two decades, much effort has been focused on improving the transmittance of the ESFADOF, and there is limited progress on how to simplify the system effectively [7][8][9][10].…”