High-performance frequency stabilization of ultraviolet diode lasers by using dichroic atomic vapor spectroscopy and transfer cavity*

Abstract

We develop a high-performance ultraviolet (UV) frequency stabilization technique implemented directly on UV diode lasers by combining the dichroic atomic vapor laser lock and the resonant transfer cavity lock. As an example, we demonstrate a stable locking with measured frequency standard deviations of approximately 200 kHz and 300 kHz for 399 nm and 370 nm diode lasers in 20 min. We achieve a long-term frequency drift of no more than 1 MHz for the target 370 nm laser within an hour, which is further verified with fluorescence count rates of a single trapped 171Yb+ ion. We also find strong linear correlations between lock points and environmental factors such as temperature and atmospheric pressure. Our approach provides a simple and stable solution at a relatively low cost, and features flexible control, high feedback bandwidth and minimal power consumption of the target UV laser.

A 37 mJ, 100 Hz, high energy single frequency oscillator*

“…Single-frequency Nd:YAG laser has a wide range of applications, as optical metrology, high-resolution spectroscopy, coherent detection, [1][2][3][4][5][6][7][8] and especially Fouriertelescopy (FT). [9][10][11][12][13][14][15][16][17][18] To obtain a single-frequency laser, three problems need to be solved, including single longitudinal mode selection, single transverse mode selection, and energy enhancement.…”

Realization of ultralow power phase locking by optimizing Q factor of resonant photodetector*

“…Pound-Drever-Hall (PDH) technique, as a powerful and elegant locking method, has been widely adopted to achieve a narrow-linewidth and low-noise laser by stabilizing the frequency of the laser to a high-finesse optical cavity. [1][2][3][4][5][6] Precision metrology, [7][8][9][10][11] atomic [12,13] and molecular [14][15][16] manipulations have directly benefited from the resulting improvement in laser stability. For example, interferometric measurements such as the search for gravitational waves critically depend on the availability of narrow-linewidth laser systems with extremely low frequency and amplitude noise.…”