Generation of pulsed and continuous-wave squeezed light with ⁸⁷Rb vapor

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We present experimental studies on the generation of pulsed and continuous-wave squeezed vacuum via nonlinear rotation of the polarization ellipse in a ⁸⁷Rb vapor. Squeezing is observed for a wide range of input powers and pump detunings on the D1 line, while only excess noise is present on the D2 line. The maximum continuous-wave squeezing observed is - 1.4 ±0.1 dB (-2.0 dB corrected for losses). We measure -1.1 dB squeezing at the resonance frequency of the ⁸⁵Rb F=3 → F' transition, which may allow the storage of squeezed light generated by ⁸⁷Rb in a ⁸⁵Rb quantum memory. Using a pulsed pump, pulsed squeezed light with -1 dB of squeezing for 200 ns pulse widths is observed at 1 MHz repetition rate.