EnergyMax-USB/RS Sensors January 2011 EnergyMax-USB/RS Sensor Guide Superior Reliability & Performance

Coherent Operational Excellence Operational Experience You Can Count On nical Support Tech For Product Reliability, Speed of Responsiveness, and Technical Support, make the safe choice you can always count on – Coherent. Overall product warranty rate <1% Calibration turnaround time <5 days On-time delivery for all new orders >95% Shipment of C24 orders within 24 hours Operational Excellence In a recent customer survey we found that Product Reliability, Speed of Responsiveness, and Technical Support are the three top criteria when choosing a laser test and measurement supplier. That’s why we place...

Coherent has expanded their meterless laser measurement concept with a new range of energy sensors in which all meter electronics are miniaturized and integrated within the sensor head cable. Specifically, Coherent's entire range of high performance EnergyMax sensors are now available in this form factor with either RS-232 or USB 2.0 connectivity. This product range enables measurement of the energy per pulse or average power of pulsed lasers from the nanojoule to the multi-joule level, over wavelengths from the deep ultraviolet through the far infrared, and from single pulses to repetition rates...

EnergyMax-USB/RS Sensors Product Overview Main Product Features • Able to measure every pulse up to 10 kHz and stream this data over the host port (USB only). RS-232 capable of measuring every pulse up to 10 Khz and streaming data over host port at a rate of 1 kHz. • EnergyMax-USB provides direct USB high speed 2.0 connection to PC. Power provided via USB connection. • EnergyMax-RS provides RS-232 connectivity. Power input provided via +4-20 VDC input. EnergyMax PC operating with multiple sensors • Fast 14-bit A/D converter supports measurement accuracy similar to that found in Coherent’s top-of...

EnergyMax-USB/RS Sensors Introduction and Selection Charts Features • Superior damage resistance • High repetition rate operation • Large dynamic range gives each sensor broad coverage • Low noise and excellent linearity for greater accuracy • Large active area Coherent EnergyMax sensors enable laser pulse energy measurement over a broad range of wavelengths, repetition rates, pulse energies and beam diameters. With their unique combination of superior performance and user-friendly convenience, EnergyMax sensors are your best choice no matter what your particular laser energy measurement need....

All pyroelectric EnergyMax sensors incorporate a diffuse coating to minimize specular reflections and eliminate spurious beams that can re-enter the laser cavity. In addition, all EnergyMax sensors include onboard electronics that contain built-in wavelength compensation factors. Enter the wavelength of the laser being measured into the software and this will automatically compensate for the sensor output. The chart below plots the typical absorption percentage of each coating. Explanation of Part Numbers EnergyMax part numbers are "Smart" part numbers that have the following meaning: MT for...

Overall measurement accuracy is a combination of calibration uncertainty (found in the sensor specification tables) and the wavelength compensation accuracy (found in the "Wavelength Compensation Accuracy" table, below). The combined accuracy is based upon practices outlined in the National Institute of Standards Guidelines for Evaluating and Expressing Uncertainty (NIST Technical Note 1297, 1994 Edition). The combined accuracy of the measurement is calculated by using the law of propagation of uncertainty using the "root-sum-of-square" (square root of the sum of squares), sometimes described...

The next table summarizes the maximum average power rating for each sensor. These power levels are achieved by combining active temperature compensation circuitry and enhanced thermal management techniques. Maximum average power is wavelength dependent because absorption changes with wavelength. Reference the spectral absorption chart on the previous page for use at wavelengths other than those listed in the table below. Maximum average power is inversely proportional to the spectral absorption. The 25 mm and 50 mm aperture sensors can accept optional heat sinks that users can install by mounting...

The next selection chart shows the range of wavelengths that can be measured with each sensor. This characteristic is coating dependent, so sensors with diffusers may have a narrower spectral range than similar sensors without diffusers. The spectral compensation of each sensor is unique to that serial number, and is based upon spectral scans performed on each sensor disk (and on each optic if the sensor has a diffuser). The spectral compensation provides greater measurement accuracy for wavelengths that differ from the optical calibration wavelength. EnergyMax Repetition Rate Capabilities

Energy Sensor Summary Specifications Before using a sensor, it is important to ensure that the laser beam will not damage the sensor coating. The damage threshold is also wavelength dependent, and maximum energy density thresholds are listed for common laser wavelengths in the table below. At other wavelengths it is safe to interpolate between the listed values. EnergyMax Damage Threshold (mJ/cm2) Damage Threshold Model 193 nm 248 nm 266 nm 355 nm 532 nm 1064 nm The table below shows the key specifications for each sensor. Additional specifications can be found on pages 7 to 11 Heat Sink. Diffuse...

EnergyMax-USB/RS Sensors MaxBlack Coating Features • Unique MaxBlack coating increases damage threshold, allows high repetition rate operation, and improves mechanical durability • Operate over the 190 nm to 12 μm range • Enable pulse energy measurements from 500 nJ to 2J with high signal-to-noise characteristics • Measure single shot to 1 kHz repetition rate • Spectral compensation characteristics built into each unit • Onboard sensors provide automatic temperature compensation These sensors allow measurements over a wide range of wavelengths, beam diameters, average power levels, and repetition...