Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Frequency stabilization of a fiber laser to rubidium: a high-accuracy 1.53-μm wavelength standard

Sarah L. Gilbert

Published Apr 30, 1993• 10 citations

Abstract

Spectroscopy of the rubidium 5P3/2 yields 4D5/2 transition near 1.529 micrometers has been performed using a single-longitudinal-mode erbium-doped fiber laser. Rubidium atoms were laser-cooled and confined in a vapor-cell Zeeman optical trap. This produced a dense sample of cold atoms and reduce the Doppler broadening of the transition to less than the natural linewidth. Transition linewidths of 10 MHz were observed on the 5P3/2 yields 4D5/2 transition and the fiber laser was actively stabilized to the 5P3/2, F equals 3 yields 4D5/2, F' equals 3 line of 87Rb.

DOI: 10.1117/12.143669

Related papers

High-resolution spectroscopy of laser-cooled rubidium in a vapor-cell trap

Sarah L. Gilbert

A goal of the wavelength-standard research at NIST is to produce a primary wavelength standard in the 1.5-µm region with a linewidth and reproducibility' of better than 1 MHz. Accurate wavelength standards in this region are important for many of the proposed optical-communication schemes involving frequency-division multiplexing and coherent detection.

Quantum Electronics and Laser Science ConferenceMay 2, 19934 citations

Absorption spectroscopy of trapped rubidium atoms

S. Cauchi, Andrejs Vorozcovs, M. Weel +3 more

We determine the absolute density of a sample of laser-cooled atoms in a two-level system by recording the absorption spectrum of the 85Rb 5S1/2 (F = 3, mf = 3) → 5P3/2 (F′ = 4, m′f = 4) transition. Trapped atoms were prepared in the (F = 3, mf = 3) ground state through optical-pumping techniques. We compare our results with an independent measure of the density that relies on a direct measurement of the number of atoms and size of the atomic sample. We also study the contributions of power broadening, laser line width, and Doppler broadening to the measured absorption spectrum. Our studies suggest that the natural line width (~6 MHz) can be measured to a precision of less than ~50 kHz if the laser line width is measured in real-time with a high-finesse Fabry–Perot cavity. PACS Nos.: 32.70.Cs, 32.70.Jz, 32.80.Pj, 42.62.Fi, 32.70.–n, 32.30.–r

Canadian Journal of PhysicsNov 1, 200410 citations

A Cold-Atom Optical Frequency Standard for Optical Fiber Communication by Using an Erbium-Fiber-Based Frequency Comb

Haoyuan Lu, Jianxiao Leng, Ping Guo +3 more

We demonstrate an approach of cold-atom frequency standard based on the two-photon transition (TPT) in rubidium (Rb), using an Erbium-fiber-based Frequency Comb. By introducing the technique of laser cooling and atoms trapping, our scheme can eliminate most of Doppler-broadening background. The fractional stability of the frequency standard can reach 6×10-12 and 4.5×10-13 at 1 s and 1000 s. This system has many applications, particularly for optical fiber communication.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)May 1, 20180 citations

Frequency stabilization of diode laser on the wavelength of 5P3/2→5D5/2of rubidium transition

A.Yu. Kalatskiy, Anton E. Afanasiev, Павел Николаевич Мелентьев +1 more

The method of frequency stabilization of diode laser on the wavelength of 5P3/2→5D5/2 of rubidium (776 nm) has been realized. The two-photon absorption spectroscopy of the rubidium vapors is underlie of the suggested scheme. The basic parameters such as the intensity of laser radiation and concentration of the vapors have been investigated. The frequency stability of radiation was about 1 MHz

EPJ Web of ConferencesDec 13, 20160 citations

Frequency Stabilization Technology of 1560 nm Fiber Laser Based on Rubidium Modulation Transfer Spectroscopy

Yang Bai, Jun Ruan, Dandan Liu +3 more

The modulation transfer spectroscopy (MTS) technique used to stabilize two different transition lines of rubidium, required for laser cooling of atoms, is investigated. The laser source is based on a 1560 nm semiconductor laser diode that is amplified by an erbium doped fiber amplifier (EDFA). The laser output is frequency doubled with a fiber coupled periodically poled Lithium Niobate (PPLN) crystal to 780 nm. To address the weak spectral features of repumping laser, a theoretical study is conducted followed by experimental verification. The 87Rb D2 line F = 1 → F' = 0 transition temperature-enhanced MTS signal is observed, which provides a choice to stabilize the repumping laser frquency on the F = 1 → F ' = 2 transition using frequency shifting with acousto-optic modulators (AOMs). Compared with the orignal MTS signal, this method is shown to be more stable and accurate for laser frequency locking. Laer frequency locking is realized by controlling the driving current of the seed laser using digital PID feedback. After locking, the laser linewidth is 35.36 kHz.

IEEE photonics journalMay 20, 20245 citations

Improving 795 nm Single-Frequency Laser’s Frequency Stability by Means of the Bright-State Spectroscopy with Rubidium Vapor Cell

Junye Zhao, Yongbiao Yang, Lulu Zhang +2 more

The utilization of atomic or molecular spectroscopy for frequency locking of single-frequency laser to improve laser frequency stability plays an important role in the experimental investigation of optically pumped atomic magnetometers, atomic clocks, laser cooling and trapping of atoms, etc. We have experimentally demonstrated a technique for frequency stabilization of a single-frequency laser employing the bright state spectroscopy (BSS) with a rubidium atomic vapor cell. By utilizing the counter-propagating dual-frequency 795 nm laser beams with mutually orthogonal linear polarization and a frequency difference of 6.834 GHz, which is equal to the hyperfine splitting of rubidium-87 ground state 5S1/2, an absorption-enhanced signal with narrow linewidth at the center of Doppler-broadened transmission spectroscopy is observed when continuous scanning the laser frequency over rubidium-87 D1 transition. This is the so-called BSS. Amplitude of the absorption-enhanced signal in the BSS is much larger compared with the conventional saturation absorption spectroscopy (SAS). The relationship between linewidth and amplitude of the BSS signal and laser beam intensity has been investigated. This high-contrast absorption-enhanced BSS signal has been employed for the laser frequency stabilization. The experimental results show that the frequency stability is 4.4×10−11 with an integration time of 40 s, near one order of magnitude better than that for using the SAS.

PhotonicsDec 11, 20244 citations