Ga(IO₃)₃: a mid-IR nonlinear optical iodate with balanced performance between band gap and second harmonic generation response

Abstract

The balance between band gap and second harmonic generation (SHG) response, which are usually inversely related, is the key factor for achieving good performance in a mid-infrared (mid-IR) nonlinear optical...

Anhydrous Aluminum Iodate: Strong Second Harmonic Generation Effect Contributed by Unbonded and Antibonding Orbitals

“…Ultraviolet–visible–near-infrared (UV–vis–NIR) diffuse reflectance spectroscopy measurements show that AIO has a band gap of 4.03 eV (Figure ), which is relatively larger than those of Ga­(IO 3 ) 3 (3.94 eV) and α-In­(IO 3 ) 3 (∼3.9 eV), and a similar IR absorption edge of about 12.3 μm (Figure S2). , …”

“…Furthermore, according to the Kurtz−Perry rule, it is phase-matchable within the particle size range of 40−125 μm (Figure 6b). 24 It is noteworthy that this effect surpasses that of classical nonlinear crystals α-LiIO 3 and the other compounds Ga(IO 3 ) 3 (13 × KDP) 17 and In(IO 3 ) 3 [<Ga(IO 3 ) 3 ] 16 in the M IIIA (IO 3 ) 3 series.…”

“…16 Very recently, the SHG effect of Ga(IO 3 ) 3 has been studied in more detail. 17 However, the NLO effect of iodates containing Al element has been rarely studied, 18,19 except for Al(IO 3 ) 3 •8H 2 O 20 containing crystalline water. It is well known that compounds containing crystalline water often have lower thermal stability, which is very unfavorable for NLO crystals used for high-energy lasers.…”

“…Ultraviolet−visible−near-infrared (UV−vis−NIR) diffuse reflectance spectroscopy measurements show that AIO has a band gap of 4.03 eV (Figure 5), which is relatively larger than those of Ga(IO 3 ) 3 (3.94 eV) and α-In(IO 3 ) 3 (∼3.9 eV), and a similar IR absorption edge of about 12.3 μm (Figure S2). 16,17 The powder SHG responses of AIO were evaluated by using a Q-switched Nd:YAG laser with a modified Kurtz−Perry method under a 1064 nm fundamental laser (5 ns and 1 Hz). AIO shows a strong SHG response of approximately 18.3 × KDP with particle sizes ranging from 112 to 125 μm (Figure 6a).…”

“…The NLO effect of Ga­(IO 3 ) 3 and In­(IO 3 ) 3 in the M IIIA (IO 3 ) 3 (M IIIA = Al, Ga, and In) series has been reported in 2007 . Very recently, the SHG effect of Ga­(IO 3 ) 3 has been studied in more detail . However, the NLO effect of iodates containing Al element has been rarely studied, , except for Al­(IO 3 ) 3 ·8H 2 O containing crystalline water.…”