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Conference on Lasers and Electro-Optics

Demonstration of dichroic atomic vapor laser lock in micro fabricated vapor cell using light induced atomic desorption

Eliran Talker, Pankaj Arora, Roy Zektzer, Yefim Barash, Noa Mazurski, Yoel Sebbag, Uriel Levy

Published Jan 1, 2019• 1 citation
Publisher

Abstract

We demonstrate Dichroic Atomic Vapor Laser Lock (DAVLL) using light induced atomic desorption in micro fabricated vapor cell. We have stabilized a 780 nm laser with a precision better than 400 kHz without heating.
DOI
10.1364/cleo_at.2019.jw2a.110

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Review of Scientific Instruments•Apr 1, 2018•3 citations
A dichroic atomic vapor laser lock (DAVLL) system exploiting buffer-gas-filled millimeter-scale vapor cells is presented. This system offers similar stability as achievable with conventional DAVLL system using bulk vapor cells, but has several important advantages. In addition to its compactness, it may provide continuous stabilization in a multi-gigahertz range around the optical transition. This range may be controlled either by changing the temperature of the vapor or by application of a buffer gas under an appropriate pressure. In particular, we experimentally demonstrate the ability of the system to lock the laser frequency between two hyperfine components of the (85)Rb ground state or as far as 16 GHz away from the closest optical transition.
The design and performance of a compact heated vapor cell unit for realizing a dichroic atomic vapor laser lock (DAVLL) for the D(2) transitions in atomic rubidium is described. A 5 cm long vapor cell is placed in a double-solenoid arrangement to produce the required magnetic field; the heat from the solenoid is used to increase the vapor pressure and correspondingly the DAVLL signal. We have characterized experimentally the dependence of important features of the DAVLL signal on magnetic field and cell temperature. For the weaker transitions both the amplitude and gradient of the signal are increased by an order of magnitude.
We report the frequency stabilization of a diode laser by applying the dichroic-atomic-vapor laser lock (DAVLL) method to a thin Rb vapor cell. A 1-mm-long Rb vapor cell is used to obtain a sub-Doppler spectrum that is required for frequency locking, which is easier than in the case of using a saturated absorption spectrometer. A 794-nm diode laser is tuned to the Rb D 1 line, and sub-Doppler signals are observed by introducing a pumping beam and a probe beam in a perpendicular direction. We obtain error signals by subtracting the signals of σ+ polarized beams from that of σ- polarized beams in the presence of a magnetic field and stabilized the 794 nm diode laser frequency without modulating laser parameters. The stability of the 794-nm diode laser is evaluated using other independently stabilized diode laser.
In the quest to employ miniaturized atomic vapor cells for quantum applications, unfortunately such a short optical path is insufficient to obtain a decent signal that can be used to lock a laser. Heating up the cell would work, but at the price of undesired currents and linewidth broadening. Instead, the authors use light-induced atomic desorption (LIAD) to increase the atomic (and optical) density. Using LIAD yields a much larger contrast than does conventional spectroscopy---even at room temperature. Furthermore, eliminating the need for heating allow remote operation, without the need to provide electrical contacts to the device, which can be an important advantage in applications.