Newport Spectra-Physics Newsletter - #32 - May 2010 - (Page 10)
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New Focus™ Quadrant Photoreceivers Family
Ideal for measuring deviations of laser beams.
The New Focus™ quadrant-cell photoreceivers are ideal when you need to measure deviations in the position or pointing of your laser beam, such as that required in beam-stabilization systems. Quadrant-cell photoreceivers consist of four individual yet identical photocells positioned very close to each other (100 µm gaps). To increase the sensitivity of these photoreceivers, each of the cells’ photocurrents is sent to its own individual amplifier before being processed with the other photocell signals to generate top-minus-bottom difference (vertical error) and right-minus-left difference (horizontal error) signals. A sum-of-all quadrants signal is also provided for normalization purposes. Model 2923 is the latest addition to New Focus’ high performance, with both the USB and analog output, quadrant cell detector family and the technical specifications are provided in the table below.
Model # 2901 2921 2903 2923 Wavelength Range (nm) 190–1050 300–1050 900–1700 900–1700 3-dB Bandwidth, Typical (kHz) 100 50 100 100 to analog output Conversion Gain (V/W) 102 to 106 103 to 105 2 x 102 to 2 x 105 3 x 103 to 3 x 105
D E T E C T O R S
See our website for more info. www.newfocus.com/QCD
0 0 -5 -10 -15 -20 5 10 15 20
Biased Photodiode Detectors
Suitable for many high speed laser applications.
Newport’s 818-BB series biased photodiode detectors are cost effective diagnostic tools suitable for a variety of high speed applications such as viewing of Q-switched, modelocked, or rapidly modulated laser signals and picosecond laser alignment. The 818-BB-50 high-speed biased photodetector consists of a free-space 830 to 2100 nm extended InGaAs photodiode with a 40 µm active diameter and a fast <35 ps rise time. With the wavelength range extended up to 2100 nm, it allows monitoring Thulium (Tm) and Holmium (Ho) doped lasers as well as other NIR lasers. It includes a built-in 3 V bias supply, an on-off switch and an SMA connector output. The batteries are easily replaceable and by disconnecting the detector from the oscilloscope input, when not in use, you can extend the lifetime of the batteries. Model 818-BB-50F is a fiber pigtailed version with a FC/PC connector.
Frequency (GHz) Extended InGaAs
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 1.4 1.6 1.8 2.0 2.2
Model Detector Type Spectral Range Bias Voltage Cut Off Frequency 818-BB-50 Semiconductor PIN, biased 0.83–2.1 µm 3V >10 GHz
See our website for more info. www.newport.com/818-BB
Table of Contents for the Digital Edition of Newport Spectra-Physics Newsletter - #32 - May 2010
Cover and Contents
- Mai Tai® SP Short Pulse One Box Amplifier Seeder
- SCG-800-CARS Optimized Supercontinuum GenerationFiber Device
- Model 6100 Combo Laser Diode and TemperatureController
- Milan™ Laser Safety Eyewear
- Agilis™ AG-LS25-27 Piezo Motor-Driven Linear Stage
- S-2000AN Non-Magnetic Isolator
- OTS-LSC Laser Safety Curtain for SmartTable OTS Optical Tables
- DMH-DL-U Data Link for DMH-1 Digital Micrometer, USB Interface
- New Catalog Offering of Colored-Glass Alternative Filters
- Newport Optics Offered at Greatly Reduced Prices!
- New Focus™ Quadrant Photoreceivers Family
- 818-BB-50 AND 818-BB-50F Biased Photodiode Detectors
- WEU-01 Wavelength Extension Unit
- CARS-KT Coherent anti-Stokes Raman Scattering Microspectrometer
Newport Spectra-Physics Newsletter - #32 - May 2010