Locking Electronics | TOPTICA Photonics AG

Specification

	PFD	FALC110	DLC pro Lock	DFC CORE + internal Lock
Description	Phase Frequency Detector	Fast Analog PID	All-digital PID	All-digital PID
Recommended for lock of DL pro to DFC	x	x	x
Recommended for lock of DFC to opt. reference	x	x		x
Task	Error signal generation	High bandwidth phase lock	Slow feedback to DLC pro laser	Slow feedback to DFC
Max. bandwidth		≈ 45 MHz	≈ 30 kHz	≈ 30 kHz
Remote control	x	via PFD	x	x
Rack compatibility	x	x	x	x
Stand alone		x	optional software license for DLC pro	included in any DFC CORE +
Power supply	DLC Ext	DLC Ext
Dimensions PFD, FALC110, DLC EXT	131 x 184 x 286 mm³		included in DLC pro	included in DFC CORE +

Applications

The DFC locking electronics consisting of the Phase Frequency Detector (PFD) and FALC 110 provides high-end phase frequency locking for comb applications. The PFD RF input is designed for use with the RF output signal of the DFC MD. The error signal generated by the PFD is fed to the input of the FALC 110 regulator. The main output of the FALC is passed through the PFD to allow for remote switching of the fast feedback loop which modulates the laser diode current. A copy of the error signal (mon. out) is used to close the slow feedback loop acting on the DL pro piezo (Fine In) with the all-digital PID of the DLC pro. Slow and fast feedback loop can be enabled and disabled with a push of a button in the DFC user interface (TOPAS DFC).

Downloads

Literature

Scientific Article: E. Benkler et al., End-to-end topology for fiber comb based optical frequency transfer at the 10⁻²¹ level, Optics Express [27], 36886 (2019)
Scientific Article: E. C. Cook et al., Resonant two-photon spectroscopy of the 2s3d ¹D₂ level of neutral ⁹Be Phys. Rev. Applied 101, 042503 (2020)
Scientific Article: M. Collombon et al., Experimental Demonstration of Three-Photon Coherent Population Trapping in an Ion Cloud, Phys. Rev. Applied 12, 034035, (2019)
Scientific Article: M. Collombon et al., Phase transfer between three visible lasers for coherent population trapping, Optics Letters Vol. 44, Issue 4 (2019)
Scientific Article: A. Liehl et al., Ultrabroadband out-of-loop characterization of the carrier-envelope phase noise of an offset-free Er:fiber frequency comb. Optics Letters Vol. 42, Issue 10 (2017)
Scientific Article: T. Puppe et al., Characterization of a DFG comb showing quadratic scaling of the phase noise with frequency, Optics Letters Vol. 41, Issue 8 (2016)
Scientific Article: G. Krauss et al., All-passive phase locking of a compact Er:fiber laser system, Opt. Lett., 36, 540 (2011)
Scientific Article: D. Fehrenbacher et al., Free-running performance and full control of a passively phase-stable Er:fiber frequency comb. Optica Vol. 2, Issue 10 (2015)
Scientific Article: R. Kliese et al., Difference-frequency combs in cold atom physics, arXiv:1605.02426v1 (2016)
Scientific Article: D. Brida et al., Ultrabroadband Er:fiber lasers, Laser & Photonics Review 8(3) (2014)

Locking Electronics: FALC & PFD

Push-button phase-frequency lock