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We have developed and characterised a stable, narrow linewidthexternal-cavity laser (ECL) tunable over 100 nm around 1080 nm, using asingle-angled-facet gain chip. We propose the ECL as a low-cost,high-performance alternative to fibre and diode lasers in this wavelength rangeand demonstrate its capability through the spectroscopy of metastable helium.Within the coarse tuning range, the wavelength can be continuously tuned over30 pm (7.8 GHz) without mode-hopping and modulated with bandwidths up to 3 kHz(piezo) and 37(3) kHz (current). The spectral linewidth of the free-running ECLwas measured to be 22(2) kHz (Gaussian) and 4.2(3) kHz (Lorentzian) over 22.5ms, while a long-term frequency stability better than 40(20) kHz over 11 hourswas observed when locked to an atomic reference.

Widely tunable, narrow linewidth external-cavity gain chip laser for spectroscopy between 1.0 - 1.1 um