High-power near diffraction-limited 1 064-nm Nd:YAG rod laser and second harmonic generation by intracavity-frequency-doubling (original) (raw)
Related papers
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.
Review of Scientific Instruments, 2010
We have developed an efficient and high power repetitively Q-switched diode-pumped intracavity frequency doubled Nd:YAG/LiB 3 O 5 based green laser capable of generating 124 W of average green power with 50 ns pulse duration in a highly compact and robust linear cavity configuration. The pump to green beam conversion efficiency is 16.8% and the overall wall-plug efficiency is 8.3%. The long term power stability is excellent with Ϯ0.4 W variation at the maximum output power and Ϯ2% amplitude fluctuation with Ϯ2.9 ns timing jitter. The M 2 parameter of the green beam was measured to be ϳ27. This, combined with the short pulse duration and the high average power, makes this laser ideal for pumping ultrafast Ti:sapphire laser amplifier systems and for micromachining applications.
43W picosecond laser and second-harmonic generation experiment
Optics Communications, 2009
Combining the advantages of diode-end-pumped Nd: YVO 4 and diode-side-pumped Nd: YAG amplifiers, a high average power and high beam quality picosecond laser is designed. The system delivers a picosecond laser with average power of 43.4 W and good beam quality of M 2 < 1.7. By focusing the high power picosecond laser in LBO crystal, 532 nm green laser with maximal power of 20.8 W is generated and the conversion efficiency of second-harmonic generation reaches 56.4% when 17.7 W green laser obtained from the fundamental frequency laser with power of 31.4 W and beam quality of M 2 < 1.25.
High-power solid-state 4-µm laser based on Nd:YAG technology and difference-frequency generation
Journal of The Optical Society of America, 1992
We present an analysis of difference-frequency generation techniques used to produce laser output in the 4-,m atmospheric window. A numerical model is developed for investigation of the mixing of 1.44and 1.06-/gLm Nd:YAG lasers to produce 4.04-gum radiation in a LiNbO 3 crystal. The results indicate that output energies of 40-50 mJ at 4.04 gum can be obtained from a realistic laser system.
High average power diode-end-pumped intracavity-doubled Nd:YAG laser
Advanced Solid State Lasers, 1998
A compact diode-pumped Nd:YAG laser was frequency-doubled to 0.532 pm with an intracavity KTP or LB0 crystal using a "V" cavity configuration. Two acousto-optic Q-switches were employed at repetition rates of lo-30 kHz. Dichroic fold and end mirrors were used to output two beams with up to 140 W of 0.532 pm power using KTP and 116 W using LB0 as the frequency doubling crystal. This corresponds to 66% of the maximum output power at 1.064 pm obtained with an optimized output coupler reflectivity. The minimum output pulse duration varied with repetition rate from 90 to 130 ns. The multimode output beam had a smooth profile and a beam quality of M2 = 5 1.
Diode pumped Ho:YAG and Ho:LuAG lasers, Q-switching and second harmonic generation
Applied Physics B, 2011
Direct diode pumped Ho:YAG generated laser pulses at 2.12 µm with an optical to optical slope efficiency of 0.24. Ho:YAG and Ho:LuAG laser rods were evaluated with both wide and narrow bandwidth pump diodes. The laser wavelength varies with the level of pumping and optical design. This variation was found to be predictable. Second harmonic at 1.06 µm was produced in a 6.0 mm long BBO crystal.
Development of a UV Source Based on Frequency Quadrupling of a Q-switched Nd:YAG laser
2009
In this master thesis project, a pulsed 236 nm light source operating in the UV spectral region was designed and constructed. A passively Q-switched quasi-three level Nd:YAG laser operating at 946 nm was first constructed to act as the fundamental source. Through an extra-cavity frequency doubling process using PPKTP and BiBO crystals, laser emission of 473 nm was produced with conversion efficiencies of 8.4% and 26% respectively. Using a second single pass configuration through a BBO crystal, UV emission was produced where 2.4 mW average power was obtained. Chapter 1: Introduction 1.1 Background After the construction of the first working laser in 1960 by Theodore Maiman [1] the development of new lasers having different properties followed fast. A year later second harmonic generation was demonstrated by P. Franken et al [2] which was also the first experiment on optical frequency conversion. By 1962 Q-switching was independently discovered and demonstrated by R.W. Hellwarth and F.J. McClung using electrically switched Kerr cell shutters in a ruby laser [3]. The first working Nd:YAG laser, which still remains the most versatile and commonly used solid-state laser, was demonstrated by Geusic et al. [4] at Bell Laboratories in 1964. The pace of progress is a sure indication of how fast laser advances progressed in the short time after its invention. Today lasers comprise an important and irreplaceable part in a variety of applications in industrial, medical as well as scientific fields. Lasers operating in the UV spectral range represent one of the fastest growing segments of the laser market today, since their application extends to various fields. Some examples for applications that utilize UV lasers are as follows: Scientific uses include ultraviolet spectroscopy, nonlinear spectroscopy, remote sensing and pollution monitoring materials. Industrial applications include semiconductor fabrication systems, thin film deposition, precision micromachining and micro-lithography. For many years the only sources for UV radiation were gas lasers, however these lasers have drawbacks as they have limited reliability, high power consumption, and high cost. Recent developments in solid-state laser technology have allowed the production of reliable UV lasers with high powers and excellent mode quality. Using multiple nonlinear frequency processes for obtaining lasers working in the UV spectral range, is becoming a common technique. The crystals used for this purpose however, have low nonlinear coefficients leading to low powers, so in order to obtain increased power and performance, pulsed solid-state lasers operating in the infrared range are frequently utilized. This enables the production of higher peak powers hence making it suitable for efficient nonlinear frequency conversion. 1.2 Objective The objective of this thesis was to design and construct a solid-state laser operating at 236 nm, corresponding to the UV spectral range, by means of frequency quadrupling. As the fundamental laser, an Nd:YAG laser operating at 946 nm was constructed and later Q-switched for pulsed operation using Cr 4+ :YAG as a saturable absorber. For generation of blue light at 473 nm, frequency doubling in BiBO cut for type-I phase-matching and periodically poled KTP (PPKTP) with a nominal grating of 6.09 µm designed for first order quasi-phase matching at o C was investigated. The output emission at 476 nm was frequency doubled a second time using a BBO crystal cut for type-I phase-matching.