The LB1005-S High-Speed Servo Controller makes stabilizing the frequency or amplitude of lasers easy and intuitive. And, unlike competitive products currently available, the LB1005-S Servo Controller is a one-box solution - no expensive external chassis required.
This high-speed proportional integral (P-I) controller has an intuitive front panel for the independent control of the P-I corner frequency, overall servo gain, and low-frequency gain limit. This flexibility enables the Model LB1005 to cascade with other units for the high-speed control of diode lasers using both piezo-electric transducers and current modulation inputs.
While narrow-linewidth lasers are used throughout atomic, molecular, and optical physics, their short-term wavelength stability is often not adequate for many applications without active stabilization. Feedback (or servo) control forces a system, such as a laser, to stay actively "locked" to a desired value, e.g., a specific wavelength - automatically correcting for external disturbances that might cause the system to deviate from the desired value. The New Focus LB1005 High-Speed Servo Controller provides critical signal-processing electronics for performing the feedback control. In the case of wavelength locking, an error signal is generated by transmitting a portion of the laser output through a wavelength reference such as a gas cell or etalon. Any wavelength instability is converted to an amplitude charge that can be detected by a photodetector. The resulting error signal is filtered by the LB1005 Servo Controller to form a control signal that is sent back to the laser.
The LB1005 Servo Controller consists of three stages of analog electronics processing: Input Stage, Filter Stage, and Output Stage. (Figure 2) The Filter Stage is the most important because it sets the behavior of the system. The user controls three important filter parameters that impact the stability of the system, and how well the actual output matches the desired value (P-I corner, Proportional Gain, and Low Frequency Gain Limit). Differential inputs that are auto-terminated if not used, a sensitive, low-noise offset for lock point selection, and an error monitor output make the Input Stage flexible. The Output Stage not only provides the correction signal, but also control over the amplitude of the correction signal to match the input to the laser being locked. Sweep input, span, and center adjustments make it easy to find the desired lock point and a TTL "Integrator Hold" and modulation inputs allow for more advanced locking techniques not available in competitors' models.
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