If your ready paying your camera the price of a small car, Xenics has a few alternatives that work well. They also have a support team who replies to your quest

If your ready paying your camera the price of a small car, Xenics has a few alternatives that work well. They also have a support team who replies to your questions. It's important to note that some technologies (Micro-bolometers, InGaAs) have export restrictions due to applications for weapons systems, etc..