Cr:LiSAF
Cr3+:LiSAF gain medium possesses broad emission bands in the near infrared that allow widely tunable laser operation and generation of ~10 fs light pulses via mode-locking technique. Cr:LiSAF crystals can be grown with a very low loss level (0,2%/cm) and it enables to construct high-Q-cavities, resulting in lasing thresholds as low as 2 mW and slope efficiencies above 50%. Moreover, nonlinear refractive index of Cr:LiSAF is about four times lower than Ti:sapphire, which reduces unwanted nonlinearities in ultrashort pulse generation and amplification. It’s excellent laser material with high energy storage and high slope efficiency. It’s also ideal working materials under conditions of ultra short pulse and ultra high power. Currently, Cr:LiSAF related products such as flashlight pumping and semi-conductor pumping laser have been widely used.
Parameter
| Orientation | a-cut |
| Parallelism | <10〞 |
| Perpendicularity | 10ˊ |
| Chamfer | 0.1mm@45° |
| Surface Quality | 10-5 S-D |
| Wavefront Distortion | λ/8 @632.8 nm |
| Surface Flatness | λ/10 @632.8 nm |
| Clear Aperture | >90% |
| Face Diameter Tolerance | +0/-0.1mm |
| Length Tolerance | ±0.1mm |
| Coatings | R<1%@670nm+R<0.5%@700～1100nm on both faces |
| Laser Induced Damage Threshold | >10J/cm2@1064nm, 10ns |
| Crystal Structure | Trigonal |
| Space Group | P31C |
| Lattice Constants | a=5.08, c=10.21 Å |
| Density (g/cm3) | 3.45 |
| Melting Point | 766°C |
| Mohs Hardness | 4 |
| Modulus of Elasticity(GPa) | 109 |
| Specific Heat(J/gK@298K) | 0.842 |
| Thermal Conductivity(W·m-1·K-1) | 4.6(∥a), 5.1(∥c) |
| Thermal Expansion(10-6K-1) | 2.2(∥a), 3.6(∥c) |
| Typical Doping Level | 0.8～1.5@.% |
| Absorption Peak Wavelength(nm) | 670 |
| Absorption Cross-section at Peak(10-20cm2) | 5.5 |
| Absorption Bandwidth at Peak Wavelength | ～100nm |
| dn/dT (10-6K-1) | -4.2(no), -4.6(ne) |
| Refractive Index | n=1.41 |
| Laser Wavelength(nm) | 830(780-920) |
| Lifetime of 4T2 Energy Level(μs) | 67 |
| Emission Cross-Section(10-20cm2) | 5 |
| Scatter Losses(%/cm) | <0.2 |
| λ(nm) | nc | na |
| 846 | 1.407 | 1.405 |
| 670 | 1.409 | 1.407 |
| 423 | 1.413 | 1.412 |
| 290 | 1.42 | 1.42 |
| 266 | 1.422 | 1.424 |
Feature
- Broad absorption and emission bands
- Nonlinear refractive index is about four times lower than Ti:sapphire
- Custom crystals available upon request
Application
- Femtosecond lasers and CPA laser systems
- Flashlight pumping and semi-conductor pumping laser
Literature
| [1] Wang J , Qi L , Zheng Q , et al. 430nm DPSS blue laser generated by sum-frequency mixing[J]. Optik, 2018, 170:233-236. |
| [2] Dowling K , Hyde S , Dainty J C , et al. 2-D fluorescence lifetime imaging using a time-gated image intensifier[J]. Optics Communications, 1997, 135(1-3):27-31. |
| [3] Dai J , Zhang W , Zhang L , et al. A diode-pumped, self-starting, all-solid-state self-mode-locked Cr:LiSGAF laser[J]. Optics & Laser Technology, 2001, 33(2):71-73. |
| [4] Mondal N N . A novel detection system for laser cooling of ortho-positronium[J]. Nuclear Inst & Methods in Physics Research A, 2002, 495(2):161-169. |
| [5] Knappe R , Bitz G , Boller K J , et al. Compact single-frequency diode-pumped Cr:LiSAF lasers[J]. Optics Communications, 1997, 143(1-3):42-46. |
| [6] Demirbas U . Cr: Colquiriite Lasers: Current Status and Challenges for Further Progress. 2018. |
| [7] Robertson A , Knappe R , Wallenstein R . Diode-pumped broadly tunable (809–910 nm) femtosecond Cr:LiSAF laser[J]. Optics Communications, 1998, 147(4-6):294-298. |
| [8] Eichenholz J M , Richardson M , Mizell G . Diode pumped, frequency doubled LiSAF microlaser[J]. Optics Communications, 1998, 153(4-6):263-266. |
| [9] G.R Morrison and M Ebrahimzadeh and C.F Rae and M.H Dunn. Diode-pumped, Q-switched, 1.321 μm Nd:YLF laser and its frequency doubling[J]. Optics Communications, 1995. |
| [10] Sutherland J M , Ruan S , Mellish R , et al. Diode-pumped, single-frequency, Cr:LiSAF coupled-cavity microchip laser[J]. Optics Communications, 1995, 113( 4–6):458-462. |
| [11] Parsons-Karavassilis D , Gu Y , Ansari Z , et al. Diode-pumped spatially dispersed broadband Cr:LiSGAF and Cr:LiSAF c.w. laser sources applied to short-coherence photorefractive holography[J]. Optics Communications, 2000, 181(4-6):361-367. |
| [12] Isemann A , Weels P , Fallnich C . Directly diode-pumped Colquiriite regenerative amplifiers[J]. Optics Communications, 2006, 260(1):211-222. |
| [13] Kunpeng L , Li Y , Yanlong S , et al. Dual-wavelength operation in all-solid-state Cr:LiSAF lasers with grating-controlled coupled-cavities[J]. Optics & Laser Technology, 2015, 74:1-5. |
| [14] BC Weber, Hirth A . Efficient single-pulse emission with submicrosecond duration from a Cr:LiSAF laser[J]. Optics Communications, 1996, 128(1-3):158–165. |
| [15] Sadao, Uemura, and, et al. Femtosecond Cr:LiSAF laser pumped by a single diode laser[J]. Optics Communications, 1997, 138(4-6):330-332. |
| [16] Agnesi A , Pirzio F , Ugolotti E , et al. Femtosecond single-mode diode-pumped Cr:LiSAF laser mode-locked with single-walled carbon nanotubes[J]. Optics Communications, 2012, 285(5):742-745. |
| [17] Kunpeng L , Yanlong S , Li Y , et al. High-efficiency tunable dual-wavelength Cr:LiSAF laser with external grating feedback[J]. Optics Communications, 2017, 405:233-237. |
| [18] Fromzel V A , Prasad C R . Influence of a small inhomogeneous broadening of Cr^3^+:LiSrAlF[J]. |
| [19] Demirbas U , Uecker R , Klimm D , et al. Intra-cavity frequency-doubled Cr:LiCAF laser with 265 mW continuous-wave blue (395–405 nm) output[J]. Optics Communications, 2014, 320:38-42. |
| [20] Barbosa E A , Vieira N D . Kerr-lens mode locking resonator calculation with two nonlinear elements[J]. Optics Communications, 2001, 188(1-4):205-211. |
| [21] Samtleben T A , Hulliger J . LiCaAlF6 and LiSrAlF6: Tunable solid state laser host materials[J]. Optics and Lasers in Engineering, 2005, 43(3-5):251-262. |
| [22] Uemura S , Miyazaki K . Operation of a femtosecond Cr:LiSAF solitary laser near zero group-delay dispersion[J]. Optics Communications, 1997, 133(1-6):201-204. |
| [23] Munin E , Villaverde A B , Bass M . Optical absorption, absorption saturation and a useful figure of merit for chromium doped glasses[J]. Journal of Physics & Chemistry of Solids, 1997, 58(1):51-57. |
| [24] DA Biasetti, Liscia E , Torchia G A . Optical waveguides fabricated in Cr:LiSAF by femtosecond laser micromachining[J]. Optical Materials, 2017, 73:25-32. |
| [25] Passilly N , Haouas E , V Ménard, et al. Population lensing effect in Cr:LiSAF probed by Z-scan technique[J]. Optics Communications, 2006, 260(2):703-707. |
| [26] Weber B C , Hirth A . Presentation of a new and simple technique of Q-switching with a LiSrAlF 6:Cr 3+ oscillator[J]. Optics Communications, 1998, 149(4-6):301-306. |
| [27] Robertson A , Ernst U , Knappe R , et al. Prismless diode-pumped mode-locked femtosecond Cr:LiSAF laser[J]. Optics Communications, 1999, 163(1-3):38-43. |
| [28] Agate B , Stormont B , Kemp A J , et al. Simplified cavity designs for efficient and compact femtosecond Cr:LiSAF lasers[J]. Optics Communications, 2002, 205(1-3):207-213. |
| [29] Ruiz M , Barbosa E A , Maldonado E P , et al. Zone melting growth of LiSrAlF6:Cr crystals for diode laser pumping[J]. Journal of Crystal Growth, 2002, 241(1-2):177-182. |
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Related Product
I’m looking for an undoped LiSAF crystal,
– diameter 5 mm, thickness 5 mm
or
– diameter 1/”, thickness 5 mm
or
diameter 1″, thickness 5 mm
all with optically polished faces.