Unmodulated diode laser stabilized by the Zeeman modulation technique

Abstract

The extended cavity diode lasers’ frequencies were stabilized by the usage of the 1st and 3rd derivatives signals obtained from hyperfine resonances of the ⁸⁷Rb D₂ line with the Zeeman modulation technique. By using the 3rd derivatives of the F = 1 → F^/ = 2 and CO_10–11 resonances 4.2 × 10⁻¹² τ^−1/2, 3.5 × 10⁻¹³ τ^−1/2 and, 1.2 × 10⁻¹² τ^−1/2 frequency stability values were obtained at 1, 400 and 10⁴ s integration times, respectively. Frequency stability measurements were also measured concerning derivative signals obtained from F = 2 → F^/ = 3, CO_21–23, and CO_22–23 crossover resonances. The 1.4 × 10^–12 τ^−1/2 @1 s, 2.7 × 10^–13 τ^−1/2 @300 s, and 9.6 × 10⁻¹³ τ^−1/2 @10⁴ s frequency stability values were attained with using of 1st derivative of CO_22–23, and CO_21–23.