Optical Parametric Oscillators of Bariumborate and Lithiumborate: New Sources for Powerful Tunable Laser Radiation in the Ultraviolet, Visible and Near Infrared

Low-threshold operation of a 355-nm pumped nanosecond β-BaB2O4 optical parametric oscillator

“…The measured threshold pump energy was found to vary from $0.8 mJ at 420 nm to $0.5 mJ at 670 nm. Observation of measured threshold being lower than that calculated are not uncommon [1,4]. One of the likely reasons is use of a lower value of measured, d eff .…”

“…Attractive features of such sources include all-solid-state design and the possibility of very broad wavelength tuning range using just a single nonlinear crystal. Of the numerous configurations, the type-I phase matched pulsed OPO based on b-Ba 2 BO 4 (BBO), pumped by the third harmonic of a Q-switched Nd:YAG, has been established as the most versatile and practical source of nanosecond pulsed radiation, with output wavelength tunable over the range from 412 nm to 2.7 mm [1][2][3][4][5][6]. However, most of these visible-NIR OPOs, especially when high-loss dispersive elements such as gratings are incorporated in the cavity to reduce the output linewidth, exhibit a high-pulse energy threshold in the UV.…”

Highly Efficient Wavelength Conversion of Q-Switched Nd:YAG Lasers Into a Red Wavelength

“…Fourier transforming (1)-(5) into the spatial-frequency domain results in where and are the spatial frequencies in and directions, respectively, ( 1, 2, 3, 4, 6) are the Fourier transforms of the complex field amplitudes, and Fourier-transforms a function in the transverse dimension by calculating (12) Equations (7)- (11) are integrated using the Cash-Karp Runge-Kutta algorithm [33]. At the beginning of each step, terms are inverse-Fourier-transformed to obtain and the arguments of the Fourier transform function in (7)-(11) are calculated.…”

Locking the cavity of a pulsed periodically poled lithium niobate optical parametric oscillator to the wavelength of a continuous-wave injection seeder by an “intensity-dip” method

“…Early implementations of the injection-seeding strategy have been reviewed, 9,10 beginning with the pioneering work of Bjorkholm and Danielmeyer, 11 who used pulsed, single-mode ruby and Nd:YAG lasers as pump and seed, respectively, for a LiNbO 3 OPO. In addition to our own contributions, 2,3,12-16 there are numerous previous instances 11,[17][18][19][20][21][22][23][24][25][26][27][28][29] of injection-seeded pulsed OPO devices in which the seed radiation is of sufficiently narrow bandwidth to attain SLM operation of the OPO. Many of these examples pertain to TDL-seeded OPOs, 2,3,[12][13][14][15][16][19][20][21][22][24][25][26][27]29 whereas others include OPO injection seeding with cw dye, 17,28 color-center, 18 and Ti:sapphire 23 lasers.…”