High-energy single-frequency 167  nm deep-ultraviolet laser

Abstract

We report a high-energy single-frequency deep-ultraviolet (DUV) solid-state laser at 167.079 nm by the eighth-harmonic generation of a diode-pumped Nd:LGGG laser. A maximum DUV laser output energy of 1.5 μJ at a 5 Hz repetition rate with a 200 μs pulse duration is achieved. The central wavelength of the DUV laser is located at 167.079 nm and can be finely tuned from 167.075 to 167.083 nm. The linewidth is estimated to be 0.025 pm. To the best of our knowledge, this is the first Letter reporting a high-energy single-frequency solid-state DUV laser below 170 nm. The successful demonstration of the high-energy single-frequency DUV laser source with the unique wavelength is useful for direct detection of a Al27 ion via resonance fluorescence in a multi-ion optical clock.

Simulation and experiment of the cooling effect of trapped ion by pulsed laser*

“…Next, we take the 27 Al + as an example, using the pulse width and duty ratio of the laser mentioned in Refs. [20,21] (the pulse width of the 167 nm pulsed laser is 200 µs, and the duty ratio is 1‰) as the input value of the model, through calculation and simulation, the possibility of using this pulsed 073701-5 laser to achieve Doppler laser cooling of the 27 Al + has been explored.…”

“…The pulse width is 200 µs with a duty ratio of only 1‰ limited by technical reasons related to the crystal growth. [20,21] It can be expected that the pulsed laser Doppler cooling effect for ions with low duty cycle should be different from that by continuous laser, which makes the efficiency and effectiveness of pulsed laser cooling has become a valuable research topic.…”

All-solid-state VUV frequency comb at 160 nm using high-harmonic generation in nonlinear femtosecond enhancement cavity

“…The extension of frequency comb metrology beyond the UV spectral range into the DUV [1][2][3][4] and even into the VUV and XUV [5][6][7][8][9] gives an opportunity to measure new important atomic and molecular transitions for testing quantum electrodynamics or to look for new atomic clock transitions. Perturbative non-linear conversion methods in solids such as second-and sum-frequency generation are limited at about 160 nm by the transparency of the used non-linear crystal [10][11][12], and have been realized at low (kHz or lower) repetition rates. To reach short wavelengths at high repetition rates, non-perturbative highharmonic generation is currently the only candidate.…”

10.3 W diode-pumped passively mode-locked Nd:YAG laser at 1319 nm with a semiconductor saturable absorber mirror

“…For example, peak power in excess of 10 W at 1.3 µm is important for all-optical fiber loop switches [9][10][11][12]. For nonlinear frequency conversion, ~0.16 µm deep-ultraviolet (DUV) lasers, which have been demonstrated by eighth harmonic generation of 1.3 µm [13][14][15], is significant and may bring great benefits for scientific instruments and some potential applications, such as angle-resolved photo-emission spectroscopy (ARPES) [16], direct frequency comb spectroscopy [17], 27 Al + ion optical clock [18], and direct nuclear laser excitation for 229m Th [19]. Especially, compared with 0.177 µm laser source [15], 0.16 µm DUV laser with photon energy of 7.5 eV in ARPES can observe the electronic structure around the antinode region of copper-based high temperature super-conductors.…”