Broadband difference frequency generation around phase-match singularity

Tsutomu Yanagawa; Hirohisa Kanbara; Osamu Tadanaga; Masaki Asobe; Hiroyuki Suzuki; Junji Yumoto
April 2005
Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p161106
Academic Journal
It is shown that a wide tunability range of greater than 500 nm can be obtained in the 2 μm band in an 18 mm long periodically poled lithium niobate chip with a single quasiphase-matching grating period at a constant temperature. This letter demonstrates the difference frequency generation bandwidth. A tunable bandwidth of over 130 nm is experimentally confirmed in the 2 μm region. This broad bandwidth can be realized by means of the phase-match curve distortion caused by the phase-match singularity. The wavelength conversion temperature dependence is also shown for several quasiphase-matching grating periods.


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