Demonstration of cascaded harmonic generation in a silica nanowire for deep UV to NIR frequency comb using nJ pulse energies

Posted on 13.09.2021 - 16:16
Compact, turn-key frequency combs in the deep ultra-violet (UV) to near infrared (NIR) wavelength region are important for applications ranging from frequency metrology, quantum memory to light-atom interactions. Translation of an IR (1550 nm) comb from a compact mode-locked laser to visible wavelength region, using cascading of optical nonlinearities, provides the simplest way to realize an on-demand deep UV to NIR comb. However, the translation of an IR comb to the visible region extending from deep UV to NIR has been difficult to achieve in a single device. We exploit chirped pulsed compression and dispersion engineering to report the simultaneous generation of second- (780 nm), third- (520 nm) and sixth-order (260 nm) harmonics of a 1560 nm mode-locked laser in a 10 mm long silica nanowire using nJ pulse energies. Phase noise and RF spectrum measurements of the 520 nm signal show that the 82 MHz frequency comb at 1560 nm is translated to visible with good fidelity. The use of a single-mode fiber nanotaper and turn-key mode locked IR laser creates a hybrid platform that provides deep UV to NIR comb and enable applications in quantum optics through trapping and probing of atoms using the evanescent field of nanotaper.

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Pant, Ravi; Mishra, Akhileshwar (2021): Demonstration of cascaded harmonic generation in a silica nanowire for deep UV to NIR frequency comb using nJ pulse energies. The Optical Society. Collection. https://doi.org/10.6084/m9.figshare.c.5541480.v2
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