Transversally diode-pumped Q-switched Nd:YAG laser with improved power and spatial characteristics (original) (raw)
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Applied Optics, 1998
As much as 1.6-W average output power was emitted in a simple setup from a diffusion-bonded Nd:YAG rod with 70 -100-ns Q-switched pulses at 946 nm and repetition frequencies between 15 and 45 kHz at 22-W incident diode-pump power. A Cr 4ϩ :YAG crystal with a bleachable loss of approximately 2.5% and a length of 0.5 mm was used as a saturable absorber. The extraction efficiency was 47% in comparison with the continuous-wave laser output power of 3.37 W in the free-running regime.
57 mJ with 10 ns passively Q-switched diode pumped Nd:YAG laser using Cr4+:YAG crystal
Optical and Quantum Electronics, 2015
In this paper, a side diode pumped passively Q-switched Nd:YAG laser is presented using a Cr 4? :YAG as saturable absorber. The performance of the Nd:YAG laser in the free-running and Q-switched modes is theoretically and experimentally studied with different output coupler reflectivities and different initial transmissions of Cr 4? :YAG crystals. The optimum reflectivity of the output coupler is found to be 25 % in the Q-switched mode according to the theoretical calculations and experimental results. The initial transmission of Cr 4? :YAG is set to 20 % in order to achieve maximum output energy in a single laser pulse. The experimental results are in good agreement with calculated values. In the Q-switched mode, single pulse output energy is obtained around 57 mJ with 10 ns pulse duration over 1-20 Hz pulse repetition rates. The optical to optical conversion efficiency reaches 14.25 %.
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2005
Nd:YAG and Nd:YAP slab crystal in the form of triangle with the Brewster-angle-cut polished input faces was used as an active medium for diode-side-pumped laser. A horizontal projection of the active medium form is a triangle with 19.22 mm long base, 5 mm height, and thickness of 4 mm. This active crystal shape is one from the simplest form which makes possible to realise a slab side-pumped configuration with a total internal reflection. Optical pumping was accomplished by a quasi-cw diode ARR18P400 with peak power 400 W closely attached to the active crystal without any coupling optics. Both material were operated for most known Nd3+ ion transition F3/2 → I11/2 (1 μm) as well as for transition F3/2 → I13/2 which leads to the emission at 1.3 μm. The systems were tested in free running and Q switch regime. This system is enough compact to be useful tools for direct medical application.
High-power diode-pumped actively Q-switched Nd:YAG laser at 1123 nm
Optics Communications, 2004
A high-power diode-pumped Nd:YAG laser at 1123 nm is acousto-optically Q-switched at a pulse repetition rate range of 5-20 kHz. Experimental results reveal that the resonator mirrors need to suppress parasitic oscillations on lines in the 1064 nm as well as 1319 nm regions for actively Q-switching operation. With an incident pump power of 19.2 W, the pulse energy increases from 0.15 mJ at 20 kHz to 0.4 mJ at 5 kHz. The highest peak power is up to 8.0 kW at 5 kHz. Furthermore, a conventional model of coupled rate equations is used to analyze the experimental data. The general agreement indicates that the simple model is adequate for a first order prediction of the low-gain laser characteristics.
Diode-pumped high-efficiency high-brightness Q-switched ND:YAG slab laser
Optics Letters, 1997
A high-eff iciency diode-pumped Q-switched Nd:YAG oscillator designed for future spaceborne applications has been demonstrated and characterized. The laser is based on a side-pumped slab geometry and uses an unstable resonator with a radially variable-ref lectivity output coupler. The laser provides an output pulse energy of 100 mJ at a 100-Hz repetition rate, with a near-diffraction-limited beam and an overall electricaloptical efficiency exceeding 6%.
2005
The effect of simultaneous diode-end-pumping to a diode-side-pumped Nd:YAG rod laser has been experimentally studied at the intracavity frequency doubled laser configuration in a highly compact linear cavity geometry. It has been observed that simultaneous end-pumping significantly improves the optical to optical conversion efficiency. With an application of 8 W of end-pumping power to a diode side-pumped acousto-optically Q-switched Nd:YAG/KTP based laser, the average green power was enhanced by 5 W improving the optical to optical conversion efficiency from 17% to 19.4%. The effect of simultaneous end-pumping in addition with the side-pumping power on the thermal focal length, resonator stability and output beam profile have been studied.
High-Repetition-Rate Q-Switched Diode-Pumped Nd:YAG Laser at 1.444 μm
Applied Optics, 1998
A diode-pumped Q-switched Nd:YAG laser that operates at the eye-safe 1444 nm wavelength has been developed. When pumped by a 10-W fiber-coupled array at 808 nm, it generated 1 W in cw operation and 560 mW at 20-kHz repetition rate with active Q-switching. Design issues such as thermal lensing characterization and beam quality are discussed.
Optics & Laser Technology, 2004
We analyzed a linear cavity for intracavity frequency doubling of a diode-pumped acousto-optic Q-switched Nd:YAG rod laser, and showed that a green laser beam with a short pulse width can be generated e ciently. A green laser output power of 73 W corresponding to the 83.9% of maximum IR output power was obtained with a 40 ns pulse width at a 10 kHz repetition rate. A green output power of 40 W with a 35 ns pulse width was measured at a 5 kHz repetition rate. Minimum laser pulse width of approximately 32 ns was obtained around 1 kHz repetition rate for both green and IR laser beams.
Evaluation Study of an Electro-optics Q-switched in End Pumped Nd: YAG Laser System
Research Journal of Applied Sciences, Engineering and Technology, 2015
We evaluation the operation of 1064 nm electro-optically Q-switched Nd: YAG rod laser that is end pumped by laser diode. The width of 400 ns, 350 ns and 250 ns were obtained at reflectivity of output coupler mirror of 99, 98 and 95%, respectively and also observed the optical resonator (L= 70-90 mm) and input optical power (350-430 mW) is effective in the value of energy per pulse (6-23 µJ) and pulse width (250-600 ns). The optimum switching time of Q-switching is obtained at 750 µs and the beam that a near-diffraction-limited quality.