[6] Yan Li, Shulian Zhang, Yanmei Han. Dual-frequency He-Ne lasers of 3~40 MHz frequency difference. High Technology Letters, 41-44(2001).
[6] Yan Li, Shulian Zhang, Yanmei Han. Dual-frequency He-Ne lasers of 3~40 MHz frequency difference. High Technology Letters, 41-44(2001).
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