Soft X-ray Streak Camera with Dynamic Range of 2000 and Picosecond Temporal Resolution
A new streak camera with more wider dynamic range and picosecond temporal resolution for soft X-ray was developed.The photocathode′s working area is 30 mm in diameter,and its focusing voltage is reduced to 8 kV to prevent electrical discharge.A post-accelaration system was introduced into the image tube for improving the phosphor screen′s quantum efficiency largely,and an external image intensifier with wide dynamic range was adopted.Experimental evaluation was carried out by means of a picosecond laser,and the results show that the dynamic range of more than 2000 can be achieved.
We show that one can optically control the photoresponse of semiconductor devices by the phase of the EM incident radiation. This can be achieved by interfering two phase-locked quantum pathways, both projecting the same initial bound state to the same energy level in the continuum. An experimental study on quantum well infrared photodectectors is presented.