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Tunable narrow-linewidth laser at 2 μm wavelength for gravitational wave detector research.

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TLDR
A narrow-linewidth external-cavity diode laser at 2 μm is presented and characterized, and it is shown that it represents a low-cost, high-performance alternative to fiber lasers for research into 2 μm photonic technologies for next-generation gravitational-wave detectors.
Abstract
We present and characterize a narrow-linewidth external-cavity diode laser at 2 μm, and show that it represents a low-cost, high-performance alternative to fiber lasers for research into 2 μm photonic technologies for next-generation gravitational-wave detectors. A linewidth of 20 kHz for a 10 ms integration time was measured without any active stabilization, with frequency noise of ∼ 15 Hz/Hz between 3 kHz and 100 kHz. This performance is suitable for the generation of quantum squeezed light, and we measure intensity noise comparable to that of master oscillators used in current gravitational wave interferometers. The laser wavelength is tunable over a 120 nm range, and both the frequency and intensity can be modulated at up to 10 MHz by modulating the diode current. These features also make it suitable for other emerging applications in the 2 μm wavelength region including gas sensing, optical communications and LIDAR.

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5 W ultra-low-noise 2 µm single-frequency fiber laser for next-generation gravitational wave detectors

TL;DR: An ultra-low-noise polarization-maintaining single-frequency fiber laser at 2 µm is demonstrated, and both relative intensity noise (RIN) and frequency noise were improved by suppressing the pump source RIN using feedback control.

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References
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Novel method for high resolution measurement of laser output spectrum

TL;DR: In this paper, the authors proposed a method by which 50 kHz resolution can be obtained for measuring the spectrum of stabilised semiconductor laser with high spectral spread, and the principle, experimental set up and results are described.
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Using diode lasers for atomic physics

TL;DR: A review of the use of diode lasers in atomic physics with an extensive list of references can be found in this article, where the authors discuss the relevant characteristics of dioder lasers and explain how to purchase and use them.
Journal ArticleDOI

Simple approach to the relation between laser frequency noise and laser line shape

TL;DR: A simple approach to this relation with an approximate formula for evaluation of the laser linewidth that can be applied to arbitrary noise spectral densities is presented.
Journal ArticleDOI

A compact grating-stabilized diode laser system for atomic physics

TL;DR: In this paper, the authors describe a compact, economic and versatile diode laser system based on commercial laser diodes, optically stabilized by means of feedback from a diffraction grating, which offers singlemode operation with a linewidth of a few 100 kHz, continuous scans over 25 GHz, high chirp rates (up to 9 GHz/ms) and FM-modulation up to the GHz range.
Journal ArticleDOI

A narrow‐band tunable diode laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb

TL;DR: In this paper, detailed instructions for the construction and operation of a diode laser system with optical feedback are presented, which uses feedback from a diffraction grating to provide a narrowband continuously tuneable source of light at red or near-IR wavelengths.
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