A simple setup for measurement of the coherence length of a laser diode using holographic optics

Dubey, Rajeev and Kumar, Raj (2019) A simple setup for measurement of the coherence length of a laser diode using holographic optics. European Journal of Physics, 40 (5). ISSN Online ISSN: 1361-6404 Print ISSN: 0143-0807

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Official URL: https://doi.org/10.1088/1361-6404/ab1d6a


Due to improvements in the technology of laser diodes, nowadays they have become an integral part of most physics and engineering undergraduate courses. Laser diodes, which generally have low coherence, are extensively used in various educational experiments due to their compactness, ease of operation and handling, as well as their cost-effectiveness. Thus, knowledge about the coherence length of beams from these laser diodes becomes important when designing experiments using these as light sources. Generally, students find it difficult to measure coherence length with most of the existing techniques. In the present work an experimental arrangement using holographic optics is designed and demonstrated to measure the temporal coherence of a laser diode beam in a compact and easy-to-align manner. The proposed scheme is particularly suitable to measure short coherence lengths. The temporal coherence of a laser diode is measured to be 2.1 ± 0.02 mm, by varying separation between two holographic optical components. The results obtained are experimentally compared with results from a Michelson interferometer.

Item Type: Article
Uncontrolled Keywords: Coherence; Holographic
Subjects: CSIO > Optics
Depositing User: Ms T Kaur
Date Deposited: 26 Feb 2020 12:13
Last Modified: 26 Feb 2020 12:13
URI: http://csioir.csio.res.in/id/eprint/793

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