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Fast Analog Linewidth Control:
FALC 110
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High-bandwidth regulator for fast locking and laser linewidth reduction
Plug-in Module for Diode Laser Supply and
Monitor Unit DC 110
- PID regulator with 10 MHz bandwidth
- Wide range of control parameters, manually adjustable
- Two high-speed differential inputs
- Low-voltage output for fast current control
- Additional slow integrator for drift cancellation via grating Piezo or laser temperature
- Sub-kHz laser linewidths demonstrated
Applications
- High-bandwidth laser frequency stabilization
- Linewidth reduction of ECDL and selected DFB lasers
- Phase locking of two lasers
- Difference frequency stabilization
- Precision frequency control (BEC, quantum optics, metrology)
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The Fast Analog Linewidth Control FALC 110 is a high-speed control amplifier designed for advanced laser frequency stabilization tasks, such as diode laser linewidth reduction, high-bandwidth frequency locking, or the realization of auxiliary high-bandwidth control loops. The module fits into TOPTICA's established SYS DC 110 rack system and can be used with tunable diode lasers such as the DL 100, the DL pro and the DL DFB.
The design of the FALC 110 was optimized with respect to a fast circuit layout (signal delay times < 15 ns). A PID regulator with 10 MHz output bandwidth controls the driver current of an external-cavity or DFB diode laser. Additionally, a slow integrator serves to cancel out long-term drifts of the laser frequency, by acting either on the grating Piezo of an ECDL, or on the current or temperature of a DFB laser. Dip switch banks on the front panel of the module allow the user to select the most appropriate settings for his locking task: the controller parameters can be varied widely.
A typical application example is the stabilization of the frequency of a DL 100, DL pro or DL DFB laser to the transmission peak of a high-finesse interferometer. Here, the FALC 110 is advantageously combined with the Pound-Drever-Hall module PDD 110 to generate a high-bandwidth error signal. Initial tests with DL pro lasers @ 780 nm, or DL DFB lasers @ 855 nm locked to TOPTICA's FPI 100, have demonstrated that linewidths far below 1 kHz can be realized, even on a time scale of several seconds.
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| Example of a locking circuit with FALC 110 and PDD 110 |
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| Beat measurement of two DL pro lasers, each laser being locked to a FPI 100 with FALC 110 and PDD 110. The beat linewidth is < 300 Hz. |
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| Application Notes |
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| Contact |
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TOPTICA Photonics AG
Lochhamer Schlag 19
82166 Graefelfing (Munich)
Germany
T +49 89 85837-0
F +49 89 85837-200
TOPTICA Photonics Inc.
1286 Blossom Drive
Victor, NY 14564
USA
T 585.657.6663
F 877.277.9897
 sales@toptica.com
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