Self-frequency-doubled BaTeMo_2O_9 Raman laser emitting at 589 nm

Abstract

In this paper, the spontaneous Raman spectra and second harmonic generation (SHG) properties at 589 nm of a novel Raman crystal BaTeMo(2)O(9) (BTM) were investigated. The BTM crystal was cut along the type-II SHG phase-matching direction for the first-order Raman shift at 1178 nm to realize the SRS and SHG simultaneously. Pumped by a nanosecond 1064 nm laser source, a self-frequency-doubled BTM Raman laser operating at 589 nm has been demonstrated for the first time. At the pump pulse energy of 48 mJ, the maximum yellow laser output pulse energy of 5.6 mJ was obtained with an optical-to-optical conversion efficiency of 11.7%. Our results show that BTM crystal is one of the promising candidate Raman materials to generate yellow laser radiation.

Multifunctional Optical Crystals for All-Solid-State Raman Lasers

“…In 2012, Yu et al confirmed that the BTM crystal has a wide transmission band (0.4-5 µm), large nonlinear coefficient (d 31 = 9.88 pm/V) and high optical damage threshold (544 MW/cm 2 ), flexible phase-matching, and high chemical, and mechanical stabilities [116]. Its strongest Raman shift is 915.2 cm −1 with line width of~4.4 cm −1 [6]. In 2013, the BTM crystal was employed as self-frequency-doubled Raman crystal to generate the yellow laser at 589 nm, as illustrated in Figure 10…”

“…For instance, in 2009, Liu et al [5] used a single KTA crystal to perform self-frequency-doubled Raman conversion from the 1064 nm fundamental beam to the 573 nm yellow beam. Another self-frequency-doubled Raman crystal, BTM, was reported by Gao et al [6] in 2013, and a maximum pulse energy of 5.6 mJ was attained for 589 nm yellow laser radiation.…”

“…As a result, the multifunctional Raman optical crystal has the advantages of compactness, easy operation, and low insertion loss [2]. Up to now, most multifunctional Raman optical crystals are self-Raman crystals with laser and Raman properties [3,4], and only a few multifunctional Raman optical crystals are self-frequency-doubled Raman crystals, with both frequencydoubled and Raman properties [5,6]. There are four kinds of self-Raman crystals: tungstate, vanadate, molybdate and silicate crystals.…”

“…[6]. Maximum pulse energy of 5.6 mJ was achieved at a pump pulse energy of 48 mJ, corresponding to optical-to-optical conversion efficiency of 11.7%.…”

Design, growth, and characterization of Y2Mo4O15 crystals for Raman laser applications

“…In order to simplify the laser configuration, the self-Raman laser for rare-earth doped crystals, including Nd:YVO 4 , 5 Nd:GdVO 4 , 6 and Yb:KGd(WO 4 ) 2 , 7 have been applied as laser and SRS crystals simultaneously. Recently, both the molybdate and tungstate, such as CaMoO 4 , 8 SrMoO 4 , 9 BaTeMo 2 O 9 , 10,11 BaWO 4 , 12 SrWO 4 , 13 and CaWO 4 , 8 have been paid attention owing to their excellent SRS properties. Although the above molybdate and tungstate crystals exhibit excellent Raman property, they are difficult for rare-earth doping due to the mismatch of their cation valence.…”