Quantum EnergyMax

Coherent Inc.

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Large-Aperture Sensors

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

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 pJ and 200 pJ, respectively, at repetition rates of up to 10 kHz. The J 10GE-LE uses 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 large aperture can eliminate the need for an integrating sphere.

All three sensors are compatible with the company’s LabMax-TOP and LabMax-TOP with general-purpose interface bus meters. Quantitative measurement of picojoule pulses is 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. The sensors also deliver repetition rate linearity of less than ±1% error, from single-pulse measurement to 10 kHz.

The 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, and measurement of kilohertz ultrafast oscillators and regenerative amplifier systems with outputs at the microjoule level or lower.

For more information, visit: www.coherent.com

Coherent Inc.
5100 Patrick Henry Drive
Santa Clara, CA 95054
Phone: (408) 764-4983
Toll Free: (800) 527-3786
Fax: (408) 764-4646

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Published: October 2009