Abstract
We demonstrate the increasing applicability of compact ultra-fast laser inscribed glass guided-wave lasers and report the highest-power glass waveguide laser with over 1.1 W of output power in monolithic operation in the short-infrared near 2070 nm achieved (51% incident slope efficiency). The holmium doped ZBLAN chip laser is in-band pumped by a 1945 nm thulium fiber laser. When operated in an extended-cavity configuration, over 1 W of output power is realized in a linearly polarized beam. Broad and continuous tunability of the extended-cavity laser is demonstrated from 2004 nm to 2099 nm. Considering its excellent beam quality of M² = 1.08, this laser shows potential as a flexible master oscillator for single frequency and mode-locking applications.
Highlights
Compact lasers emitting near 2.1 μm are desirable owing to a spectral overlap with strong liquid water absorption lines that are located in a high atmospheric transmission window
We demonstrate the increasing applicability of compact ultra-fast laser inscribed glass guided-wave lasers and report the highest-power glass waveguide laser with over 1.1 W of output power in monolithic operation in the short-infrared near 2070 nm achieved (51% incident slope efficiency)
To substantially improve the power available and efficiency from a compact chip laser, we demonstrate the first in-band pumping of a Ho3+ only doped fluorozirconate chip laser by a fiber Bragg grating (FBG) stabilized thulium fiber laser operating at 1945 nm
Summary
Compact lasers emitting near 2.1 μm are desirable owing to a spectral overlap with strong liquid water absorption lines that are located in a high atmospheric transmission window. By using a simple thulium fiber laser pump we achieve a relatively low-cost high-brightness pump source, in contrast to power limited 790 nm single emitter diode lasers (< 350 mW), or expensive semiconductor optical amplifier chips This compact guided-wave laser is an efficient gain module that can be configured in a range of cavities designed for single frequency, q-switched, or mode-locked operation. We did have an opportunity to briefly run it at higher power and achieved an output of 1.1 W for a period of approximately 2 minutes before having to allow the pump diode to cool This experiment could not be redone to improve the overall efficiency as after this experiment the waveguide ends were re-polished with a wedge on one end of the chip and a new design AR coating was applied in order to realize an extended cavity guided-wave chip laser setup (Fig. 2). The free running spectrum of this laser was measured to be centered at 2070 nm with a FWHM of 8 nm for 350 mW output
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