Ultrafast x-ray diffraction of laser-irradiated crystals
- Lawrence Berkeley National Lab., CA (US). Advanced Light Source
- Univ. of California, Berkeley, CA (US). Physics Dept.
- Univ. of Michigan, Ann Arbor, MI (US). Center for Ultrafast Optical Science
An apparatus has been developed for measuring time-dependent x-ray diffraction. X-ray pulses from an Advanced Light Source bend magnet are diffracted by a sagittally-focusing Si(111) crystal and then by a sample crystal, presently InSb(111). Laser pulses with 100 fs duration and a repetition rate of 1 KHz irradiate the sample inducing a phase transition. Two types of detectors are being employed: an x-ray streak camera and an avalanche photodiode. The streak camera is driven by a photoconductive switch and has a 2 ps temporal resolution determined by trigger jitter. The avalanche photodiode has high quantum efficiency and sufficient time resolution to detect single x-ray pulses in ALS two bunch or camshaft operation. A beamline is under construction dedicated for time resolved and micro-diffraction experiments. In the new beamline a toroidal mirror collects 3 mrad horizontally and makes a 1:1 image of the bend magnet source in the x-ray hutch. A laser induced phase transition has been observed in InSb occurring within 70 ps.
- Research Organization:
- Lawrence Berkeley National Lab., CA (US); Advanced Light Source (US)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 567361
- Report Number(s):
- LBNL--40925; CONF-9706157--; LSBL--417; LBNL/ALS-844; ON: DE98001382
- Country of Publication:
- United States
- Language:
- English
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