A novel intensity interferometer for synchrotron radiation in the vacuum ultraviolet and soft x-ray regions

作者：Tai RZ^*; Takayama Y; Takaya N; Miyahara T; Yamamoto S; Sugiyama H; Urakawa J; Hayano H; Ando M

来源：Review of Scientific Instruments, 2000, 71(3): 1256-1263.

DOI：10.1063/1.1150450

Based upon a method of Hanbury-Brown and Twiss, while considering the nonstationary characteristics of synchrotron radiation (SR), a novel optical intensity interferometer was constructed to extract the true two-photon correlation of soft x-ray SR. This intensity interferometer consists of an optical vacuum chamber, which includes a wire scanner, a beam divider, and a grating monochromator with a coherence time modulator, and of an electric correlator which completes the multiplication of two broadband electric currents. The technique of coherence time modulation, together with the two bandpass filters in the correlator, play an essential role to cancel a huge trivial correlation, which arises from the accidental coincidence between a pair of divided pulses being largely enhanced by the finite slow time response of the detection system compared to the coherence time of the photon. A preliminary performance test was conducted, and the results exhibit satisfactory functions of this interferometer.

• 出版日期2000-3