Liquid Instruments Moku:Go User Manual
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Liquid Instruments Moku:Go User Manual

Laser lock box
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Laser Lock Box
Moku:Go User Manual
The Moku:Go Laser Lock Box enables you to stabilize a laser's frequency to a reference cavity or
atomic transition using high-performance modulation locking techniques. The Laser Lock Box is
designed with the concept of staged locking and a "Lock Assist", enabling a user-defined locking
process to quickly lock to any zero-crossing on the demodulated error signal. It also features an
integrated two-channel Oscilloscope, allowing you to observe signals at any point in the signal
processing chain at up to 125 MSa/s. Additionally, the built-in Data Logger enables long-term
recording of signals.
liquidinstruments.com
 2023 Liquid Instruments. All rights reserved.

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Summary of Contents for Liquid Instruments Moku:Go

  • Page 1 Laser Lock Box Moku:Go User Manual The Moku:Go Laser Lock Box enables you to stabilize a laser's frequency to a reference cavity or atomic transition using high-performance modulation locking techniques. The Laser Lock Box is designed with the concept of staged locking and a “Lock Assist”, enabling a user-defined locking process to quickly lock to any zero-crossing on the demodulated error signal.

  • Page 2: Table Of Contents

    Lower user interface ......................... 14 Locking stage Add action Oscilloscope Lock Assist feature Data Logger Additional tools ..........................18 File Manager File Converter Power Supply .............................20 | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.
  • Page 3 Ensure Moku:Go is fully updated. For the latest information, visit: liquidinstruments.com | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 4: Introduction

    • referred to as frequency tracking. Whether used for frequency stabilization or frequency tracking, the Moku:Go Laser Lock Box is designed to assist in laser locking systems. It offers compact setup, acquisition, and diagnostic features that makes it easier and quicker to set up and characterize laser locking systems.

  • Page 5: User Interface

    The main user interface is divided into upper and lower screen sections. The upper user interface displays the processing chain and principal controls of the Laser Lock Box. | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.
  • Page 6 The lower half is readily set to display one of three parameter control panels: locking stages, Oscilloscope, and Data Logger. Description Locking stages Oscilloscope Data Logger | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 7: Main Menu

    Main menu The main menu can be accessed by pressing the icon, allowing you to: | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 8: Upper User Interface

    Apply output offset to fast PID chain Control local oscillator frequency Apply output offset to slow PID chain Control local oscillator phase Output limiter on fast PID chain | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 9: Signal Input

    Make similar configurations on input 2. Scan configurations Tap the icon to configure the settings for the scan signal. | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 10: Modulation Configuration

    Modulation configuration Tap the icon to configure the settings for the modulation signal. | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 11: Digital Filter Configuration

    Fixed sample rate of 7.8125 MHz Filter shapes Select the shape of the filter by tapping the filter icon. There are two pre-defined filter shapes and a fully customizable filter option. | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 12: Pid Controllers

    PID controllers The Moku:Go Laser Lock Box implements two cascaded PID controllers: a fast controller and a slow controller. The input of the slow PID controller is the output of the fast PID controller. Both the fast and slow PID controllers can be configured graphically by dragging interactively on the magnitude chart or by tapping on cross-over tabs and entering frequency or gain on the soft keypad.

  • Page 13: Local Oscillator

    The input signal can be demodulated with an internally generated reference signal (independent from modulation signal). This local oscillator is derived from the Moku:Go internal clock and thus shares the same timebase. The frequency range of the internal reference is 1 mHz to 20 MHz.

  • Page 14: Lower User Interface

    Choose any of the available actions to add to each locking stage. When engaged, all of the actions associated with that stage will be enabled simultaneously. | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 15: Oscilloscope

    Oscilloscope The Moku:Go Laser Lock Box includes a built-in Oscilloscope, enabling you to observe and record data of up to two signals at a time in the Laser Lock Box’s processing chain. Description Description Close Oscilloscope panel Tap to configure Oscilloscope settings,...
  • Page 16 Additional details about the Oscilloscope can be found in the Moku:Go Oscilloscope manual. | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

  • Page 17: Data Logger

    Change filename and comments for the logged file Record a new measurement The embedded Data Logger can stream over a network or save data on Moku:Go. For details, refer to the Data Logger user manual. More streaming information is in our API documents at apis.liquidinstruments.com...

  • Page 18: Additional Tools

    Additional tools The Moku:Go app has two built-in file management tools: File Manager and File Converter. The file manager allows users to download the saved data from Moku:Go to a local computer, with optional file format conversion. The File Converter converts the Moku:Go binary (.li) format on the local computer to either .csv, .mat, or .npy format.

  • Page 19: File Converter

    File Converter The converted file is saved in the same folder as the original file. The Liquid Instruments File Converter has the following menu options: Shortcut Description Options File Ctrl+O Select a .li file to convert. • Open file Ctrl+Shift+O Select a folder to convert.

  • Page 20: Power Supply

    Power Supply The Moku:Go Power Supply is available on M1 and M2 models. M1 features a 2-channel power supply, while M2 features a 4-channel power supply. The Power Supply control window can be accessed in all instruments under the main menu.
  • Page 21 Ensure Moku:Go is fully updated. For the latest information, visit: liquidinstruments.com | Moku:Go Laser Lock Box User Manual © 2023 Liquid Instruments. All rights reserved.

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