[1] Zha S Q, Chen Y J, Li B X et al. High-repetition-rate 1.5 μm passively Q-switched Er∶Yb∶YAl3(BO3)4 microchip laser[J]. Chinese Optics Letters, 19, 071402(2021).

[2] Song Q K, Li H B, Dong Y J et al. Influence of thermal lens effect on output energy of Er 3+, Yb 3+∶glass laser[J]. Chinese Journal of Lasers, 48, 1701002(2021).

[3] Gorbachenya K N, Kisel V E, Yasukevich A S et al. Eye-safe 1.55 μm passively Q-switched Er, Yb∶GdAl3(BO3)4 diode-pumped laser[J]. Optics Letters, 41, 918-921(2016).

[4] Vitiello M, Pizzarulli A, Ruffini A. A compact high power Er∶Yb∶glass eyesafe laser for infrared remote sensing applications[J]. Proceedings of SPIE, 7836, 78360C(2010).

[5] Mak A A, Polyakov V M, Vitkin V V et al. 1 mJ single-rod fiber Er∶glass laser for range finding[J]. Proceedings of SPIE, 9342, 93421K(2015).

[6] Chinn S R, King V. Subnanosecond (Er, Yb) glass Q-switched microlasers: 3-D transient modeling and experiments[J]. IEEE Journal of Quantum Electronics, 42, 1128-1136(2006).

[7] Belghachem N, Mlynczak J. Comparison of laser generation in thermally bonded and unbonded Er 3+, Yb 3+∶glass/Co 2+∶MgAl2O4 microchip lasers[J]. Optical Materials, 46, 561-564(2015).

[8] Yumashev K V, Denisov I A, Posnov N N et al. Nonlinear absorption properties of Co 2+∶MgAl2O4 crystal[J]. Applied Physics B, 70, 179-184(2000).

[9] Volk Y V, Malyarevich A M, Yumashev K V et al. Anisotropy of nonlinear absorption in Co 2+∶MgAl2O4 crystal[J]. Applied Physics B, 88, 443-447(2007).

[10] Fang Z J, Hui Y L, Li G T et al. Study on the saturable absorption characteristics of Co 2+∶MgAl2O4 with different orientations[J]. Acta Optica Sinica, 40, 2214001(2020).

[11] Okhrimchuk A G, Shestakov A V. Absorption saturation mechanism for YAG∶Cr 4+ crystals[J]. Physical Review B, 61, 988(2000).

[12] l’Ichev N N, Kir’yanov A V, Pashinin P P et al. Investigation of nonlinear-absorption anisotropy in YAG∶Cr 4+[J]. Journal of Experimental and Theoretical Physics, 78, 768-776(1994).

[13] Sickafus K E, Wills J M, Grimes N W. Structure of spinel[J]. Journal of the American Ceramic Society, 82, 3279-3292(1999).

[14] Kuleshov N V, Mikhailov V P, Scherbitsky V G et al. Absorption and luminescence of tetrahedral Co 2+ ion in MgAl2O4[J]. Journal of Luminescence, 55, 265-269(1993).

[15] Yumashev K V, Denisov I A, Posnov N N et al. Excited state absorption and passive Q-switch performance of Co 2+ doped oxide crystals[J]. Journal of Alloys and Compounds, 341, 366-370(2002).

[16] Kuo Y K, Huang M F, Birnbaum M. Tunable Cr 4+∶YSO Q-switched Cr∶LiCAF laser[J]. IEEE Journal of Quantum Electronics, 31, 657-663(1995).