Abstract
A compact solid-state single-longitudinal-mode (SLM) Q-switched laser based on a compound cavity is demonstrated. SLM operation is achieved through the enhancement of mode competition (via manipulation of the effective reflectivity of the resonator mirrors and intracavity field accumulation time) and does not require the use of a feedback loop. In this work, SLM emission with a linewidth of 254.3 MHz is demonstrated, and a high SLM ratio of up to 99.6% is achieved. The laser operates at a repetition rate of 10 Hz, producing 10 ns pulses with a pulse energy of 14.81 mJ.
Highlights
IntroductionLasers with different spectral and time-domain characteristics have been widely used in spectral detection, space exploration, manufacturing, etc. [1–4]
A number of methods have been used to produce SLM output from solid-state lasers include twisted-mode cavities (TMC) [15], ring cavities [16], the application of etalons or gratings [17–19], microchip lasers [15, 16], and seed injection lasers [20, 21]
Quarter-wave plates (QWPs) were used to form a TMC which limited the spatial hole burning in the laser gain medium
Summary
Lasers with different spectral and time-domain characteristics have been widely used in spectral detection, space exploration, manufacturing, etc. [1–4]. Across the domains of coherent optical communications, sodium guide star technology, gravitational wave detection, and non-linear optics, solid-state single-longitudinal-mode (SLM) laser sources with a narrow spectral bandwidth are attracting significant interest [5–10] These lasers, which often carry additional characteristics such as broad wavelength tuning capability, high pulse energy, and good beam quality, are enabling a host of new techniques and methodologies. It should be noted that many of these approaches yield laser outputs with quite low SLM ratio ( defined as the ratio of the number of single longitudinal mode pulses to the total number of pulses in a certain time) This is due to the wide gain bandwidth and narrow longitudinal mode spacing which is a common characteristic of solid-state lasers. The summary focusses on advancements in cavity design and mode-selecting/isolating capability
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