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Chin. Opt. Lett.
 Home  List of Issues    Issue 03 , Vol. 17 , 2019    10.3788/COL201917.031404


Observation of spectral modulation coupled with broadband transverse-mode-locking in an Yb:CALGO frequency-degenerate cavity
Yijie Shen, Zhensong Wan, Xing Fu, and Mali Gong
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, [Tsinghua University], Beijing 100084, China

Chin. Opt. Lett., 2019, 17(03): pp.031404

DOI:10.3788/COL201917.031404
Topic:Lasers and laser optics
Keywords(OCIS Code): 140.3410  140.3518  140.3580  

Abstract
A frequency-degenerate cavity (FDC) is the resonator that the ratio of transverse and longitudinal mode frequency spacings is a simple rational number. When an optical resonator is close to the FDC, transverse-mode-locking (TML) takes place with drastic changes of laser mode. We report for the first time, to the best of our knowledge, the multi-frequency emission and spectral modulation effects coupled with TML in FDC. The Yb:CaGdAlO4 (Yb:CALGO) crystal with large gain bandwidth was used as a gain medium in an off-axis-pumped hemispherical FDC for realizing broadband emission. Interestingly, the spectrum can transform from a single smooth packet shape to a multi-peak structure; meanwhile, the transverse pattern accordingly transforms into some exotic wave-packet profiles through controlling off-axis displacement in a special degenerate state.

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Received:2018/8/29
Accepted:2018/12/27
Posted online:2019/3/7

Get Citation: Yijie Shen, Zhensong Wan, Xing Fu, and Mali Gong, "Observation of spectral modulation coupled with broadband transverse-mode-locking in an Yb:CALGO frequency-degenerate cavity," Chin. Opt. Lett. 17(03), 031404(2019)

Note: This work was funded by the National Key Research and Development Program of China (No. 2017YFB1104500), the Natural Science Foundation of Beijing Municipality (No. 4172030), and the Beijing Young Talents Support Project (No. 2017000020124G044).



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