Abstract
A guided-wave chip laser operating in a single longitudinal mode at 2860 nm is presented. The cavity was set in the Littman-Metcalf configuration to achieve single-frequency operation with a side-mode suppression ratio above 33 dB. The chip laser's 2 MHz linewidth on a 10 ms scale was found to be limited by mechanical fluctuations, but its Lorentzian contribution was estimated to be lower than 1 Hz using a heterodyne technique. This demonstration incorporates a high coherence source with the simplicity provided by the compactness of chip lasers.
Highlights
Single-frequency (SF) lasers, which are sources operating in a single longitudinal mode (SLM), offer low intensity noise and long coherence properties granted by their narrow linewidth
Optical parametric oscillators (OPOs) have been extensively used [8,9,10,11]. They offer wide wavelength tuning range, high output power, narrow linewidth, and high-stability, but they use a nonlinear crystal and a cavity in which an etalon is inserted to suppress undesired modes, which quickly escalates the level of complexity
We present a Ho3+ and Pr3+-codoped ZBLAN chip laser [31] that is operated in the free-running single-frequency regime with a Lorentzian linewidth measured to be below 1 Hz
Summary
Single-frequency (SF) lasers, which are sources operating in a single longitudinal mode (SLM), offer low intensity noise and long coherence properties granted by their narrow linewidth. These valued attributes have enabled the use of SF lasers in a broad range of applications such as atomic physics [1,2], spectroscopy [3,4], sensing [5], LIDAR [6], and gravitational wave detection [7]. The FPI is used to provide an approximation of the side-mode suppression ratio (SMSR), which is validated by the mixing of the laser’s longitudinal mode
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