DURABLE, HIGH-QUALITY PUMPS FOR INDUSTRIAL CRYOGENIC APPLICATIONS. We are dedicated to providing prompt, professional service and repair work. Learn More SERVICES Services at Texas Cryogenics we believe in providing quality service to our Cryogenic products let you handle, store, transport, and safeguard your valuable cryogenic samples. Cryogenics, or ultracold freezing, is not a new idea, and with a couple of exceptions, the equipment used is similar to that of 25 years ago. Liquid nitrogen, or occasionally liquid helium, is retained in a cryovessel or dewar. Dec 16, 2013 · Photocarrier densities are calculated for a pump spot area of 3 μ m 2, a sample reflectance R = 0.3 , a pump wavelength of 780 nm, and a pump pulse energy of 0.14 pJ (corresponding to a 5 μ W time-averaged pump power at a repetition rate of 36.4 MHz).