Abstract
We present an EO Q-switched Tm:YAP laser constructed with a periodically poled Mg-doped congruent lithium niobate (PPMgCLN) Bragg modulator. A 2-mm-thick PPMgCLN modulator was adopted, and the internal stress generated in the electric poling process was released by annealing. The peak stress-induced refractive index variance for e-wave was deduced to be 2.29 × 10 -5 at 1064 nm. When the absorbed pump power and repetition rate were 13.4 W and 1 kHz, respectively, the laser had a Q-switched pulse energy of 2 mJ, a pulse duration of 60 ns, and a peak power of 33.3 kW. By varying the reflection of the output coupler, output wavelengths of between approximately 1985 and approximately 1940 nm can be selected, making this laser a potential tool for pumping mid-IR sources and biomedical applications.
Highlights
Two-micrometer lasers have been widely adopted for several applications including eye-safe light detection and ranging, plastic welding, wind speed measurement, and ambient gas detection [1]
We present an EO Q-switched thulium-doped yttrium aluminum perovskite (Tm):YAP laser constructed with a periodically poled Mg-doped congruent lithium niobate (PPMgCLN) Bragg modulator
We demonstrate an EO Q-switched Tm:YAP laser using an Electro-optic periodically poled lithium niobate Bragg modulators (EPBMs) with pulse energy greater than 2 mJ
Summary
Two-micrometer lasers have been widely adopted for several applications including eye-safe light detection and ranging, plastic welding, wind speed measurement, and ambient gas detection [1]. Several Q-switching devices are typically adopted in pulsed 2-μm lasers, including active acousto-optic modulators (AOMs) [7], electro-optic modulators (EOMs) [8], and passive saturable absorbers (SAs) [9]. Electro-optic periodically poled lithium niobate Bragg modulators (EPBMs) have been demonstrated to have low applied voltage and to be insensitive to temperature [10]. Due to the low damage threshold (100 MW/cm at 1064 nm) [13] and limited thickness, ∼1 mm, of periodically poled congruent lithium niobate (PPCLN), the practical applications of EPBM were restricted and only ∼200 μJ pulse energy was demonstrated in Nd:YVO4 laser [10]. Poled magnesium-doped congruent lithium niobate (PPMgCLN) has a thickness of up to 10 mm [14], giving it potential application for producing a high-energy electro-optic (EO) Q-switched laser. Compared with a previous report [10], a 10-fold improvement was achieved
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