Balanced Receivers

Product catalog summary

Overview: This document provides comprehensive specifications and operational details for various models of auto-balanced photoreceivers. These devices are engineered to minimize laser noise and improve signal detection in optical experiments.

Specifications:

Models 20X7: Includes Models 2007 and 2017, featuring a patented auto-balancing circuit that reduces laser noise by 50 dB. They support signal, balanced, and auto-balanced modes, with a 125 kHz bandwidth and a peak conversion gain of up to 1×10⁶ V/W.
Models 23X7: Large-area balanced photoreceivers with adjustable gain settings, reducing common-mode noise by 40 dB, suitable for coherent heterodyne-detection applications.
Models 21X7: Higher-gain, lower-bandwidth photoreceivers with adjustable gain and bandwidth settings, offering a 25 dB noise reduction, ideal for Doppler LIDAR and OCT applications.
Models 18X7: 80-MHz balanced photoreceivers with a 25 dB common-mode rejection ratio, suitable for high-frequency applications.
650-MHz & 800-MHz Models: Provide large bandwidths for various laboratory experiments, with a 25 dB common-mode rejection ratio.

Key Features:

Auto-balancing circuit for noise reduction.
Multiple operational modes for flexibility in different applications.
Compatibility with both free-space and FC-fiber inputs.
Adjustable gain and bandwidth settings for tailored performance.

Recommendations:

Use the recommended Model 0901 power supply for safe operation.
Select the specific model based on required bandwidth and application needs.

Graphical Data: Includes graphs demonstrating typical responsivity and noise reduction capabilities, emphasizing their effectiveness in reducing laser noise and enhancing signal clarity.

Additional Overview: Discusses the functionality and applications of balanced photoreceivers, focusing on models 1607-AC and 1617-AC, designed to cancel laser intensity noise and enhance sensitivity.

Additional Specifications: Operate by subtracting photocurrents from two matched photodetectors to cancel common-mode noise. Require manual power equalization between signal and reference beams. Key specifications include:

Wavelength Range: 320–1000 nm (1607-AC), 900–1700 nm (1617-AC)
3-dB Bandwidth: 40 kHz–650 MHz (1607-AC), 40 kHz–800 MHz (1617-AC)
Peak Conversion Gain: 350 V/W (1607-AC), 700 V/W (1617-AC)
Typical Maximum Responsivity: 0.5 A/W (1607-AC), 1.0 A/W (1617-AC)
Power Requirements: ±15 V, <200 mA

Applications: Useful in absorption spectroscopy, heterodyne detection, and ellipsometric measurements, designed to detect small signals by cancelling residual intensity noise.

Design and Features: Feature free-space and FC-connectorized versions, high-bandwidth performance due to unique photodetector packaging, and a low-frequency feedback loop in the Nirvana™ auto-balanced photoreceiver for automatic DC balance.

Technical Insights: Highlights the use of the Nirvana™ photoreceiver in a laser-based atomic-absorption sensor for process control, demonstrating high sensitivity and specificity in real-time control applications.

Conclusion: Balanced photoreceivers provide significant advantages in noise cancellation and sensitivity enhancement, making them valuable tools in various optical measurement applications.

Catalog excerpts

1.16" (29.5) battery check LED photodetectors2x 1.040-32 THDfor mounting Model 1280 Filter Holders and Model 1281 FC Fiber Adapters (not included) output BNCgain-setting switchpower switch 4.06"(103.1) external input power (15VDC) 1.00" (25.4)1.25" (31.8)0.585" (14.9)1.33" (33.8) 8-32 (M4) THD0.58" (14.7) Wavelength Range 4001070 nm 800֖1750 nm > Responsivity,A/W 0.00.20.40.60.81.0 3-dB Bandwidth > 1MHz, 200 kHz, 150 kHz 150 kHz, 30 kHz, 30 kHz > 400800120016002000 Typical Common-Mode Rejection 40 dB 40 dB Wavelength, nm Rise Time 500 ns 3.3 Ƶs > Peak Conversion Gain 1.2 10 > 6 V/W 1.6 ח 10 >...

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