Optical heterodyne interferometry technique for solution crystal growth rate measurement

Yong-Kee Kim; B. Rami Reddy; T G George; Ravindra B. Lal

doi:10.1117/1.601861

1 February 1998 Optical heterodyne interferometry technique for solution crystal growth rate measurement

Yong-Kee Kim, B. Rami Reddy, T G George, Ravindra B. Lal

Optical Engineering, Vol. 37, Issue 2, (February 1998). https://doi.org/10.1117/1.601861

A noncontact optical heterodyne technique was implemented for in situ measurement of crystal growth rate from solutions. A two- frequency Zeeman laser with a total output power of 1 mW (each polarized component is 0.5 mW) was used at 633 nm and is composed of two frequencies v1 and v2 that are collinear but polarized orthogonally to each other and separated by precisely 250 kHz. The sensitivity of the system was found to be 0.77 nm. This value is larger than the theoretical resolution limit of 0.065 nm because of the noise associated with the vibrations. The critical factors of the heterodyne technique for the monitoring of solution crystal growth have been studied. The growth rate of L-arginine phosphate crystal was 6.15Â±0.13 nm/s (0.53 mm/day) at the solution temperature of 28.2Â°C and seed crystal temperature of 26.0Â°C. This is the first experiment in which the heterodyne technique has been applied for real-time in situ measurement of crystal growth rate.

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Yong-Kee Kim, B. Rami Reddy, T G George, and Ravindra B. Lal "Optical heterodyne interferometry technique for solution crystal growth rate measurement," Optical Engineering 37(2), (1 February 1998). https://doi.org/10.1117/1.601861

Published: 1 February 1998

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