High energy single-frequency double-pulse hybrid MOPA system

Abstract

A laser system capable of offering double single-frequency pulses based on a hybrid master oscillator power amplifier structure is presented. Combining the advantages of all-fiber amplifier, bulk-amplifier-chain of Nd:YVO 4 and Nd:YAG, this novel design is capable of providing a pair of nanosecond laser pulses at 1064 nm wavelength with a temporal interval of 200 μs. Approximately 13 mJ of output pulse energy is recorded at a repetition rate of 30 Hz. The pulse width is around 20 ns and the spectrum linewidth is 34.1 MHz. The beam quality factor M 2 of output radiation is less than 1.30.

High efficiency single frequency 355 nm all-solid-state UV laser

“…In the fiber pre-amplifier chain, a single frequency continuous-wave (CW) NPRO 1064 nm seeder laser with linewidth of several kHz is used as the seeder laser. After chopped into nanosecond pulse sequence at 30 Hz by an AOM, the pulsed seeder laser is coupled into two identical single-mode Yb-doped fiber amplifiers (SM-YDFA) to extract energy and then further amplified by a double-clad (DC) YDFA [13]. In order to increase the side-mode suppression ratio (SMSR), another AOM is inserted before the last fiber amplifier.…”

“…A conduction-cooled LD-end-pumped angle-multiplexed double-pass Nd:YVO4 crystal amplifier and a LD-side-pumped polarization-multiplexed double-pass Nd:YAG zig-zag slab laser amplifier are employed as the high gain bulk pre-amplifier chain to amplify the laser pulse output from the fiber preamplifiers [13].…”

“…As a result, the work life of UV laser will be reduced and even the whole laser system may fall into breakdown. In this paper, combining with single-frequency hybrid MOPA system and highly efficient conductively cooled zigzag slab laser amplification technique [3,12,13], we constructed a novel high energy single-frequency 355 nm UV pulse laser to overcome the aforementioned problems. It possesses the advantages of compactness, stability with no need of separate active cavity length control and ease of modifying pulse due to acoustooptic modulation compared with injection-seeded MOPA technique.…”

Passive Phase Locking Coherent Combination of Solid-State Lasers through Stimulated Brillouin Scattering Effect

“…Therefore, it is difficult to achieve a laser system that meets the same high power, high beam quality, and high reliability laser output by solely relying on laser oscillator or power amplifier technology. Thermal lensing, thermo-optical wedge, and thermally induced birefringence effects are inevitable, which lead to a serious decrease in the average power of the output laser and the deterioration of the beam quality [6,7].…”

Injection-seeded single frequency 2.05 μm output by ring cavity optical parametric oscillator

“…The OPO is pumped by a 1064 nm single frequency nanosecond pulsed laser at a pulse repetition frequency of 20 Hz [23] . It is capable of providing a maximum single pulse energy of 11.4 mJ with a pulse width of 23.6 ns and a linewidth of 20 MHz.…”