Hyperfine measurement of the 6P_1/2 state in ⁸⁷Rb using double resonance on blue and IR transition

Abstract

In this paper, we present the spectroscopy of the 6P 1/2 state in 87 Rb using a double-resonance technique at 780 nm and 421 nm. The double-resonance technique is implemented using electromagnetically induced transparency (EIT) and optical pumping methods. Using these spectroscopy methods, we have measured the hyperfine splitting of the 6P 1/2 state with precision of <400 kHz, which agrees well with other spectroscopy methods such as electrical discharge and saturated absorption spectroscopy at 421 nm.

Narrow-line cooling of $^{87}$Rb using 5S$_{1/2} \rightarrow$ 6P$_{3/2}$ open transition at 420 nm

“…The second part is sent to the MOT chamber after mixing it with the MOT beams. The third part is sent as probe beam to another Rb vapor cell for double resonance spectroscopy of the 420 nm laser with similar scheme as [27,28].…”

Resolving closely spaced levels for Doppler mismatched double resonance

“…The blue transition (5S 1/2 → 6P 3/2 ) at 420 nm is weak and the infrared (IR) transition (5S 1/2 → 5P 3/2 ) at 780 nm is strong. The direct detection of absorption on the weak blue transition [13,14] is a bit challenging and hence the double-resonance spectroscopy [8,[15][16][17][18] is commonly used which again suffers through partial Doppler broadening. The previously double resonance spectroscopy at 420 nm and 780 nm in Rb was mainly done in 87 Rb due to the limitation posed by the residual Doppler broadening effect [8,15,17,18].…”

“…The direct detection of absorption on the weak blue transition [13,14] is a bit challenging and hence the double-resonance spectroscopy [8,[15][16][17][18] is commonly used which again suffers through partial Doppler broadening. The previously double resonance spectroscopy at 420 nm and 780 nm in Rb was mainly done in 87 Rb due to the limitation posed by the residual Doppler broadening effect [8,15,17,18]. Resolving the hyperfine levels and stabilizing the blue laser at particular transition of Rb is very important for precision measurement [14,17,19] and laser cooling as the expected temperature is 5 times lower in the magnetooptical trap than the routinely used IR transition, similar to the case of K [20] and Li [21].…”

“…The previously double resonance spectroscopy at 420 nm and 780 nm in Rb was mainly done in 87 Rb due to the limitation posed by the residual Doppler broadening effect [8,15,17,18]. Resolving the hyperfine levels and stabilizing the blue laser at particular transition of Rb is very important for precision measurement [14,17,19] and laser cooling as the expected temperature is 5 times lower in the magnetooptical trap than the routinely used IR transition, similar to the case of K [20] and Li [21]. This transition is also useful for the coherent Rydberg excitation of Rb for quantum computation and information processing [22].…”

Absorption spectroscopy and Stokes polarimetry in a $^{87}$Rb vapour in the Voigt geometry with a 1.5 T external magnetic field

“…Applications of such atomic sensors span a variety of disciplines, ranging from explosives detection [11]; gyroscopes [12]; medical imaging of soft tissues [13][14][15][16]; microfluidics [17] and measurements on spin-active solidstate systems [18]. In order to improve and sustain the development of these technologies, atomic spectroscopy in the presence of external magnetic fields has become an area of wide interest [19][20][21][22][23]. This in turn has given rise to a variety of experiments and optical devices [24][25][26][27][28][29][30][31] that help demonstrate the depth of understanding of the physics involved in said interactions, furthering the reach and possible applications of this area.…”