Large-aperture sensors accurately measure very low-energy laser pulses

Three new Quantum EnergyMax sensors from Coherent enable accurate measurement of laser pulse energies down to 20 pJ, as well as the average power of pulsed systems from the nanowatt to milliwatt level, across a broad range of wavelengths.

Oct 13th, 2009

Three new Quantum EnergyMax sensors from Coherent enable accurate measurement of laser pulse energies down to 20 pJ, as well as the average power of pulsed systems from the nanowatt to milliwatt level, across a broad range of wavelengths. Specifically, the J-10SI-LE and J-10SI-HE are both silicon-photodiode-based sensors with apertures of 10 mm and a spectral range of 325 to 900 nm, which measure down to 20 and 200 pJ, respectively, at repetition rates of up to 10 kHz. The J-10GE-LE utilizes a 10-mm-aperture germanium photodiode to measure minimum pulse energies of 200 pJ over the 800 to 1700 nm spectral range, also at up to 10 kHz. The 10 mm aperture is the largest currently available on the market for detectors of this sensitivity, and can often eliminate the need to utilize an integrating sphere. All three sensors are compatible with the Coherent LabMax-TOP and LabMax-TOP with GPIB meters. Quantum EnergyMax sensors are useful for a broad range of research, commercial, and military applications involving low power pulses.
Coherent
Santa Clara, CA
www.Coherent.com


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PRESS RELEASE

Three new Quantum EnergyMax sensors from Coherent Inc. (Santa Clara, CA) (Nasdaq: COHR) enable accurate measurement of laser pulse energies down to 20 pJ, as well as the average power of pulsed systems from the nanowatt to milliwatt level, across a broad range of wavelengths. Specifically, the J-10SI-LE and J-10SI-HE are both silicon photodiode based sensors with apertures of 10 mm and a spectral range of 325 nm to 900 nm, which measure down to 20 pJ and 200 pJ respectively, at repetition rates of up to 10 kHz. The J 10GE-LE utilizes a 10 mm aperture germanium photodiode to measure minimum pulse energies of 200 pJ over the 800 nm to 1700 nm spectral range, also at up to 10 kHz. The 10 mm aperture is the largest currently available on the market for detectors of this sensitivity, and can often eliminate the need to utilize an integrating sphere.

All three Quantum EnergyMax sensors are compatible with the Coherent LabMax-TOP and LabMax-TOP with GPIB meters. Quantitative measurement of picojoule pulses is notoriously difficult, but with these low noise meters and the new sensors' built in wavelength compensation feature, an absolute accuracy of better than 6% can be achieved. Quantum EnergyMax sensors also deliver an excellent repetition rate linearity of less than ±1% error, from single pulse measurement to 10 kHz.

Quantum EnergyMax sensors are useful for a broad range of research, commercial and military applications involving low power pulses. Examples include measurement of infrared pulsed lasers beyond 1064 nm, typically used for military targeting purposes. Other examples are measurement of kHz ultrafast oscillators and regenerative amplifier systems with outputs at the microjoule level or lower.

Founded in 1966, Coherent, Inc. is a Russell 2000 Index company and a world leader in providing laser-based solutions to the commercial and scientific research markets. Please direct any questions to Sean Bergman, product manager, at (503) 454-5785, e-mail sean.bergman@coherent.com. For more information about Coherent, including product and financial updates, visit our website at www.Coherent.com.

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