Accurate frequency noise measurement of free-running lasers

Schiemangk, Max; Spießberger, Stefan; Wicht, Andreas; Erbert, G.; Tränkle, G.; Peters, A.

doi:10.1364/ao.53.007138

Cited by 55 publications

(35 citation statements)

References 13 publications

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“…Frequency noise PSD spectra are determined for a wide bandwidth, from very low noise frequencies (1 Hz) all the way up to 3 GHz. This is accomplished by combining phase noise data derived from a time series measurement with the IQ (in-phase/quadrature) tool of the RF analyzer [5], which provides access to noise frequencies up to 12.8 MHz, and from the RF phase noise data measured with the phase noise measurement tool (PN tool; option FSV-K40 for R&S FSV-30), which provides access to noise frequencies above 12 MHz. At low noise frequencies (below 1 kHz) increased noise can be observed, which may be attributed to residual thermal and mechanical instabilities of the setup.…”

Section: B Mode-locking Performancementioning

confidence: 99%

Compact mode-locked diode laser system for high precision frequency comparisons in microgravity

Christopher

Kovalchuk

Wicht

et al. 2017

International Conference on Space Optics — ICSO 2014

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Section: B Mode-locking Performancementioning

confidence: 99%

Compact mode-locked diode laser system for high precision frequency comparisons in microgravity

Christopher

Kovalchuk

Wicht

et al. 2017

International Conference on Space Optics — ICSO 2014

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“…There is also a significant DC offset. different procedure in [11]. A quadratic fit is also performed on the extracted amplitude to account for a slow laser power drift.…”

Section: Signal Processingmentioning

confidence: 99%

“…When a second laser that is more frequency-stable than the laser under test is available to act as the LO, the so-called heterodyne approach is often preferred [10,11].…”

Section: Introductionmentioning

confidence: 99%

Passive coherent discriminator using phase diversity for the simultaneous measurement of frequency noise and intensity noise of a continuous-wave laser

et al. 2016

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The frequency noise and intensity noise of a laser set the performance limits in many modern photonics applications and, consequently, must often be characterized. As lasers continue to improve, the measurement of these noises however becomes increasingly challenging. Current approaches for the characterization of very high-performance lasers often call for a second laser with equal or higher performance to the one that is to be measured, an incoherent interferometer having an extremely long delay-arm, or an interferometer that relies on an active device. These instrumental features can be impractical or problematic under certain experimental conditions. As an alternative, this paper presents an entirely passive coherent interferometer that employs an optical 90° hybrid coupler to perform in-phase and quadrature detection. We demonstrate the technique by measuring the frequency noise power spectral density of a highly-stable 192 THz (1560 nm) fiber laser over five frequency decades. Simultaneously, we are able to measure its relative intensity noise power spectral density and characterize the correlation between its amplitude noise and phase noise. We correct some common misconceptions through a detailed theoretical analysis and demonstrate the necessity to account for normal imperfections of the optical 90° hybrid coupler. We finally conclude that this passive coherent discriminator is suitable for reliable and simple noise characterization of highly-stable lasers, with bandwidth and dynamic range benefits but susceptibility to additive noise contamination.

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“…Both beams interfere on a fast photo-detector (New Focus, 1554-B, 12 GHz). We record the resulting beat note signal with a RF-spectrum analyzer (Rohde und Schwarz, FSW) and determine the frequency noise PSD with the method described by Schiemangk et al [15]. Figure 2 shows the measured frequency noise PSD of the DFB-diode laser with resonant optical feedback, of the DFB-laser without feedback, and of a narrow linewidth ECDL [9].…”

Section: Setupmentioning

confidence: 99%

Ultra-narrow linewidth DFB-laser with optical feedback from a monolithic confocal Fabry-Perot cavity

Lewoczko‐Adamczyk¹,

Pyrlik²,

Häger³

et al. 2015

Opt. Express

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We present a compact, ultra-narrow-linewidth semiconductor laser based on a 780 nm distributed feedback diode laser optically self-locked to a mode of an external monolithic confocal Fabry-Perot resonator. We characterize spectral properties of the laser by measuring its frequency noise power spectral density. The white frequency noise levels at 5 Hz(2)/Hz above a Fourier frequency as small as 20 kHz. This noise level is more than five orders of magnitude smaller than the noise level of the same solitary diode laser without resonant optical feedback, and it is three orders of magnitude smaller than the noise level of a narrow linewidth, grating-based, extended-cavity diode laser. The corresponding Lorentzian linewidth of the laser with resonant optical feedback is 15.7 Hz at an output power exceeding 50 mW.

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Accurate frequency noise measurement of free-running lasers

Cited by 55 publications

References 13 publications

Compact mode-locked diode laser system for high precision frequency comparisons in microgravity

Compact mode-locked diode laser system for high precision frequency comparisons in microgravity

Passive coherent discriminator using phase diversity for the simultaneous measurement of frequency noise and intensity noise of a continuous-wave laser

Ultra-narrow linewidth DFB-laser with optical feedback from a monolithic confocal Fabry-Perot cavity

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