Klenner Alexander, Emaury Florian, Schriber Cinia, Diebold Andreas, Saraceno Clara J, Schilt Stéphane, Keller Ursula, Südmeyer Thomas
Opt Express. 2013 Oct 21;21(21):24770-80. doi: 10.1364/OE.21.024770.
We phase-stabilized the carrier-envelope-offset (CEO) frequency of a SESAM modelocked Yb:CaGdAlO₄ (CALGO) thin disk laser (TDL) generating 90-fs pulses at a center wavelength of 1051.6 nm and a repetition rate of 65 MHz. By launching only 2% of its output power into a photonic crystal fiber, we generated a coherent octave-spanning supercontinuum spectrum. Using a standard f-to-2f interferometer for CEO detection, we measured CEO beats with 33 dB signal-to-noise ratio in 100 kHz resolution bandwidth. We achieved a tight lock of the CEO frequency at 26.18 MHz by active feedback to the pump current. The residual in-loop integrated phase noise is 120 mrad (1 Hz-1 MHz). This is, to our knowledge, the first CEO-stabilized SESAM modelocked TDL. Our results show that a reliable lock of the CEO frequency can be achieved using standard techniques in spite of the strongly spatially multimode pumping scheme of TDLs. This opens the door towards fully-stabilized low-noise frequency combs with hundreds of watts of average power from table-top SESAM modelocked thin disk oscillators.
我们对一个SESAM锁模Yb:CaGdAlO₄（CALGO）薄盘激光器（TDL）的载波包络偏移（CEO）频率进行了相位稳定，该激光器在中心波长1051.6 nm和重复频率65 MHz下产生90飞秒脉冲。通过仅将其2%的输出功率注入到光子晶体光纤中，我们产生了一个相干的倍频程超连续谱。使用标准的f - 2f干涉仪进行CEO检测，我们在100 kHz分辨率带宽下测量到信噪比为33 dB的CEO拍频。通过对泵浦电流的有源反馈，我们实现了将CEO频率紧密锁定在26.18 MHz。环路内的残余积分相位噪声为120 mrad（1 Hz - 1 MHz）。据我们所知，这是首个实现CEO稳定的SESAM锁模TDL。我们的结果表明，尽管TDL采用了强空间多模泵浦方案，但使用标准技术仍可实现对CEO频率的可靠锁定。这为利用桌面型SESAM锁模薄盘振荡器产生数百瓦平均功率的全稳定低噪声频率梳打开了大门。
