Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Laser development: Nonlinear effects
Q 57.1: Vortrag
Freitag, 22. März 2013, 11:00–11:15, F 128
1.3-mW tunable and narrow-band continuous-wave light source at 191 nm — Matthias Scholz1, Dmitrijs Opalevs1, •Jürgen Stuhler1, Patrick Leisching1, Wilhelm Kaenders1, Guiling Wang2, Xiaoyang Wang2, Rukang Li2, and Chuangtian Chen2 — 1TOPTICA Photonics AG, 82166 Gräfelfing, Germany — 2Beijing Center for Crystal Growth and Development, Chinese Academy of Sciences, Beijing 100190, China
We present a cw narrow linewidth deep-UV source at 191 nm, consisting of a grating-stabilized diode laser which is frequency-quadrupled by two consecutive second harmonic generation (SHG) stages. In the first SHG stage, the fundamental light at 764 nm is resonantly enhanced and frequency doubled to 382 nm in a lithium triborate (LBO) crystal. The resulting uv light is beam shaped and enhanced in the second SHG stage. Using the novel crystal potassium fluoroboratoberyllate (KBBF) [1], an output power of up to 1.3 mW at 191 nm is achieved [2]. The linewidth of the laser output at 191 nm (1570 THz) is estimated to be below 300 kHz (1 km coherence length). Automatic fine tuning of the laser up to 40 GHz and coarse wavelength changes of 1 nm are possible. Similar techniques should provide wavelengths between 165 nm and 205 nm. The demonstrated light source is a unique tool for deep-UV metrology, photoemission spectroscopy, or atomic spectroscopy.
[1] C. Chen et al., Appl. Phys. B 97, 9-25 (2009).
[2] M. Scholz et al., Opt. Express 20, No. 17, 18659-18664 (2012).