Brimrose Corp. of America

Where can you find next generation radiation detectors that are resilient and quickly deployable? At Brimrose, we offer breakthrough in radiation detection technologies, especially for security and defense applications as a domestic manufacture in the US. We developed both room temperature semiconductor detector materials for direct detection as well as scintillators for indirect detection. On the semiconductor direct detection size, we offer wide bandgap CdMgTe which is ultra-fast pico-second photodetector which is a replacement for the discontinued Hamamatsu GaAs-based photodetector and all inorganic perovskite CsPbBr3 which is a cost-effective alternative to CZT, the current standard room temperature semiconductor detector. On the scintillator indirect detection side, we offer ultra-fast organic scintillator P-terphenyl, a robust, versatile material addressing many issues by current COTS detectors such as fast timing, fast neutron detection, alpha and beta spectroscopy and easy scalability while can also be used in quantum sensing and maser. We are also one of the first manufacturers in the US, offer the ground breaking new inorganic scintillator material Cs3Cu2I5, which is ultra-bright, lead-free, high performance 0D perovskite for dual-use scintillation radiation detection applications, especially for security and defense including radiovoltaic (deep-sea/underground sensors, nuclear pacemaker, military beacons…) along with usages in high energy/nuclear physics and medical imaging.

Highly efficient hyperspectral imagers, based on tunable filters, are commercially available for operating in the visible through short wavelength infrared (SWIR) region. However, acousto-optic tunable filter (AOTF) devices that operate at the two opposite ends of the spectrum (i.e. Ultraviolet (UV) and long wavelength infrared (LWIR)) are still at the developing stage. Brimrose research team aims to fill this void by developing AOTF operating in the ultraviolet (UV) as well as long wavelength Infrared (LWIR) regions. These devices can be useful for building hyperspectral imagers which can operate from UV through LWIR wavelengths. One of the objectives of our research involves development of AOTF operating from deep UV to Short Wave Infrared (SWIR) using Alpha-BaB2O4 (Alpha-BBO) and potassium dihydrogen phosphate (KDP). The LWIR operating AOTF has been fabricated using mercurous bromide (Hg2Br2) single crystals, grown in-house, using physical vapor transport (PVT). The crystalline quality and the crystallographic directions of the grown Hg2Br2 crystals are determined using x-ray diffraction technique. Hg2Br2 inherits a large Figure of merit (M2) value, the material also possesses the largest optical transparency range from visible through Tera-Hertz range. These properties along with very high birefringence make Hg2Br2 an excellent material for AOTF device fabrication. We report characterization of both the devices from UV to LWIR range. Recently, Brimrose research team has also designed and developed a highly efficient, low power acousto-optic modulator device for operating in the UV region using alpha-BBO material. If you would like to learn more about these research and developments, please contact Jan S. Kasprzak, Business Development at jkasprzak@brimrose.com or via phone during the show at 443-417-8439.

A powerful and unique AOTF based instrument that combines both, hyperspectral imager and spectropolarimeter into one package. Brimrose new hyperspectral spectropolarimeter imager (HSPI) can easily switch from a hyperspectral imager to a spectropolarimeter and back again. There are significant advantages to having both in one instrument. For example, if one image is hazy, the other may provide significantly more information by adjusting the polarimetry. Brimrose new series of AOTF-based HSPI offers significantly larger number of bands that can be used in image post processing analysis with more accurate information. When incorporated with waveplate/retarders, the imager system can be easily configured to measure all six polarization states needed for Stokes vector measurement on each pixel. The instrument can be used to develop ground based, airborne, or space-flight instrument with similar configurations, without pushbroom scan. The AOTF device is controlled electronically, which provides correct acoustic frequency driving the transducer as RF frequencies. AOTF HSI have several advantages over traditional pushbroom HSI. Traditional HSI requires careful handling and frequent calibration. They also suffer lower scan speed and lower reliability. An AOTF is an all solid-state tunable filter with no moving parts and is therefore immune to orientation changes or even severe mechanical shock and vibrations. Moreover, the AOTF is a high throughput and high-speed programmable device capable of accessing wavelengths at rates up to 16 kHz, making it an excellent tool for in-situ spectroscopy. Some of the key advantages of the AOTF HSI technology are summarized below: • Polarization Selection – AOTF can be used as analyzer for linear polarized light. • Fast speed. up to 16,000 wavelengths per sec • High optical throughput efficiency. As a result of a high diffraction efficiency (up to 90%). • Large field of view (FOV) angle up to ~ 13 degrees • Increasing reliability and ruggedness. As a result of the AOTF being a compact solid-state device (typically 1 to 5 cm3) without any mechanical moving parts, it is insensitive to mechanical vibration / shock, and can be battery powered. Temperature change induced shift of wavelength can be virtually eliminated by adjusting the acoustic frequency accordingly and thus can operate over extreme temperature ranges. The HSPI is available in both the VIS and SWIR ranges and can be customized per customer requirements in terms of camera frame rate or spatial resolution. For more information, contact Jan Kasprzak at 410-472-7070 or jank@brimrose.com.