Laser drive electronics are a very important consideration when designing any DPSS laser system. Controlling multiple laser system functions and managing the operational and safety interlocks are critical requirements.
Cutting Edge Optronics (CEO) recently manufactured one of the largest commercially available diode pumped laser amplifiers in the world. The laser amplifier pumps a one inch diameter Nd:YAG laser rod with more than 400 QCW laser diode bars, and produces more than 9 Joules of gain-switched energy and over 7.5 Joules of stored energy. This is one example of several large laser amplifiers CEO has manufactured over the past 12 months. In order to keep up with the record demand level for laser amplifiers, CEO has doubled its manufacturing capability in 2014.
Cutting Edge Optronics (CEO Laser) recently manufactured one of the largest, commercially available, diode pumped laser amplifiers in the world. This REA Series laser amplifier pumps a one inch diameter Nd:YAG laser rod with more than 400 QCW laser diode bars, and produces more than 9 Joules of gain switched energy and over 7.5 Joules of stored energy.
Dr. Jun Kojima of the Ohio Aerospace Institute with Dr. David Fischer and Dr. Quang-Viet Nguyen of the NASA Glenn Research Center recently tested a new architecture for SRS laser spectroscopy to realize time-resolved combustion diagnostics.
Ti:Sapphire lasers have become prominent in the field of ultrafast lasers and oscillators due to their broad emission bandwidth and the ability to minimize opto-thermal effects over a wide range of operating parameters. This article examines the construction of a high-power Ti:Sapphire laser from the ground up. Mode-locked lasers are discussed, as are single-pass, multi-pass, and regenerative amplifiers. The use of pulse pickers to help generate higher pulse energies is also discussed.
In order to build high-average-power Ti:Sapphire lasers, high-quality high-average-power green pump lasers are required as pumps for the final amplification stage. This article examines the main requirements on the pump lasers, and also discusses the relative merits of Nd:YAG and Nd:YLF systems.
Ti:sapphire lasers have become prominent in the field of ultrafast lasers and oscillators due to their broad emission bandwidth and the ability to minimize opto-thermal effects over a wide range of operating parameters. In order to build high-average-power Ti:sapphire lasers, high-quality high-average-power green pump lasers are required.
Cutting Edge Optronics (CEO) offers the Patara-HP family of Q-switched green lasers, which are ideally suited as pump sources for pulsed Ti:sapphire amplifiers. The performance of the Patara-HP pump lasers is examined in this work, particularly the 100W and 200W average power systems. An analysis of pulse energies at varying repetition rates, beam quality and stability, pulse-to-pulse stability, long-term power stability and beam pointing stability is presented. A discussion of laser system reliability is also included.
Northrop Grumman Cutting Edge Optronics has developed a laser diode array package with minimal bar-to-bar spacing. These High Density Stack (HDS) packages allow for a power density increase on the order of ~ 2.5x when compared to industry-standard arrays.
This work contains an overview of the manufacturing process, as well as representative data for 5-, 10-, and 20-bar arrays. Near-field and power vs. current data is presented in each case. Power densities approaching 15 kW/cm² are presented. In addition, power and wavelength are presented as a function of pulse width in order to determine the acceptable operational parameters for this type of array. In the low repetition rate Nd:YAG pumping regime, all devices are shown to operate with relatively low junction temperatures.
A discussion of future work is also presented, with a focus on extending the HDS architecture to reliable operation at 300W per bar. This will enable power densities of approximately 25 kW/cm².
Northrop Grumman Cutting Edge Optronics has developed a family of arrays for high-power QCW operation. These arrays are built using CTE-matched heat sinks and hard solder in order to maximize the reliability of the devices.
A summary of a recent life test is presented in order to quantify the reliability of QCW arrays and associated laser gain modules. A statistical analysis of the raw lifetime data is presented in order to quantify the data in such a way that is useful for laser system designers.
The life tests demonstrate the high level of reliability of these arrays in a number of operating regimes. For single-bar arrays, a MTTF of 19.8 billion shots is predicted. For four-bar samples, a MTTF of 14.6 billion shots is predicted. In addition, data representing a large pump source is analyzed and shown to have an expected lifetime of 13.5 billion shots. This corresponds to an expected operational lifetime of greater than ten thousand hours at repetition rates less than 370 Hz.
Newly published data for the next generation high energy, short pulse, Nd:YAG laser system is now available. The GIGASHOT DPSS high energy laser delivers 320 mJ of pulse energy in pulses that are less than 9 ns at 1064 nm. Integrated harmonic generation and wavelength separation options for 532 nm and 355 nm output are also available. This article contains specification data, beam images, beam quality data, and stability runs at 1064 nm, 532 nm and 355 nm.
Newly published data for one of CEO’s highest energy QCW laser amplifiers is now available for viewing. This article details typical small signal gain, stored energy, thermal lens strength and gain uniformity data.