The following are suggested optimal configurations of H200 series modules for various output wavelengths: Output pulse energy specifications

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1 CONFIGURATIONS The following are suggested optimal configurations of H series modules for various output wavelengths: 1. For 2 nd harmonics output only: the HSHC 2. For 2 nd and 3 rd harmonics: a) HSH+HS+HTHC for SH and TH output. b) HSTH+HST a cost-effective solution not requiring the replacement of modules when changing from a to beam and vice versa. The beam specification will, however, be 15% lower relative to the values specified above due to extra components in the beam path. Modules Selection Guide 3. For attenuators for all wavelengths up to the 3 th harmonic: HA1+HSH+HA2+HTH+HA3 modules. Module Description Output pulse energy Dimensions W L H, mm Extension possible? tes HSH HS HSHC Second harmonic generator beam separator Second harmonic generator with beam separator Port 1: 1064, N/d 1 12 Yes Port 1: Port 2: residual Port 1: Port 2: residual for beam for beam HSH HTH HTHC HSTH HST HA1 HA2 HA3 Third harmonic generator Third harmonic generator with beam separator Second and third harmonics generator beam separator Attenuator for beam Attenuator and beam separator for beam Attenuator and beam separator for beam Port 1: 1064, 532 & N/a 1 12 Yes Port 1: Port 2: residual 1064 & for beam 12 Port 1: 1064, 532 & N/a 12 Yes Port 1: Port 2: residual Port 1: beam Port 1: Port 2: residual Port 1: Port 2: residual for beam Transmission in 5 90% range at Transmission in 5 90% range at Transmission in 5 90% range at HSH HSH Recommended to use with HSTH HSH HTH or HSTH 62 Savanoriu AV. 237, lt Vilnius, Lithuania tel sales@ekspla.com rev

2 NL NL220 NL230 NL300 NL303D NL740 Harmonic generators For NL230 Series Lasers Nanosecond Q-switched lasers enable simple and cost effective laser wavelength conversion to shorter wavelengths through harmonics generation. EKSPLA offers a broad selection of wavelength conversion accessories for NL230 series lasers. The harmonics module uses a modular design that allows reconfiguration of laser output for the appropriate experiment wavelength. A typical module houses a non linear crystal together with a set of dichroic mirrors for separating the harmonic beam from the fundamental wavelength. nlinear crystals used for the purpose of wavelength conversion are kept at an elevated temperature in a thermo-stabilized oven. Two or more modules can be joined together for higher harmonics generation: attaching one extra module to a second harmonic generator allows for the generation of 3 rd wavelengths. It should be noted that only modules with a single output port can be joined together: it is possible to attach a HS module to a HSH unit for beam separation. Modules with two output ports (e.g., HSHC) cannot be attached to extra units. Compact harmonic modules Thermo stabilized crystals for long lifetime Dichroic mirrors AR coatings on crystals Phase matching by mechanical adjustment High conversion efficiency Wide selection of different HSH 2 nd harmonic generator Typical conversion efficiency wavelength beam conversion efficiency. HWP SHG Fig.1. Optical layout of the HSH. te: The optical layout drawing does not 1064 & 50 % (depending on laser model) N/A 12 1 mm Yes 1064 & position of HSH Contains SH crystal with and outputs SH crystal thermo stabilized H300SH H300SH Savanoriu AV. 237, lt Vilnius, Lithuania tel sales@ekspla.com rev

3 HS separators module 1064 & Fig.1. Optical layout of the HS. te: The optical layout drawing does not HSHC 2 nd harmonic generator with separator Typical conversion efficiency wavelength beam conversion efficiency. HWP Fixing screw SHG Fig.1. Optical layout of the HSHC. te: The optical layout drawing does not residual for beam 12 1 mm position of HS residual 50 % (depending on laser model) for beam 12 mm position of HSHC H300SHC and outputs H300S Contains SH crystal with H300S and outputs SH crystal thermo stabilized 6 1 H300SHC 45 High Energy Lasers Nanosecond Tunable Lasers rev Savanoriu AV. 237, lt Vilnius, Lithuania tel sales@ekspla.com 65

4 HTH 3 rd harmonic generator Typical conversion efficiency 2) wavelength beam conversion efficiency. 2) When HSH. 1064, 532 & 20 30% (depending on laser model) N/A 12 1 mm Yes Contains TH crystal with, and outputs TH crystal thermo stabilized H300TH & THG Fig. 1. Optical layout of the HTH. te: The optical layout drawing does not 1064, 532 & position of HTH H300TH HST 2 nd and 3 rd harmonic separator When HSTH. 1064, 532 & M3 Fig. 1. Optical layout of the HST. te: The optical layout drawing does not residual for beam 12 1 mm position of HST and outputs High damage threshold dielectric mirrors H300ST H300ST Savanoriu AV. 237, lt Vilnius, Lithuania tel sales@ekspla.com rev

5 HTHC 3 rd harmonic generator with separator Typical conversion efficiency 2) From wavelength to respective harmonic wavelength. 2) When HSH & Fig. 1. Optical layout of the HTHC. te: The optical layout drawing does not Contains TH crystal with and outputs TH crystal thermo stabilized HSTH 2 nd and 3 rd harmonic generator without separator Typical conversion efficiency From wavelength to respective harmonic wavelength. HWP THG s SHG THG Fig. 1. Optical layout of the HSTH. te: The optical layout drawing does not residual 1064 & % (depending on laser model) for beam 12 mm position of HTHC and residual 1064 & % (depending on laser model) N/A 12 mm 1064, 532 & position of HSTH H300THC H300STH 6 1 H300THC Contains SH and TH crystals with, and outputs SH and TH crystals thermo stabilized 6 1 H300STH High Energy Lasers Nanosecond Tunable Lasers rev Savanoriu AV. 237, lt Vilnius, Lithuania tel sales@ekspla.com 67

6 NL NL220 NL230 NL300 NL303D NL740 ATTENUatorS For NL230 Series Lasers NL230 series lasers offer several options for changing output pulse energy. The easiest option is to change the timing of the Q-switch opening relative to the flashlamp pump pulse. This option is a standard feature for all NL230 series lasers. A change in Q-switch timing, however, changes other laser pulse parameters along with the pulse energy. A decrease in pulse energy results in longer pulse duration, decreased pulse-to-pulse-stability, and possible changes in the spatial beam profile. For applications that require smooth adjustment of output pulse energy while keeping other parameters stable, EKSPLA offers HAx series attenuator modules. Compact design Smooth adjustment of output pulse energy HA1 attenuator at HWP1 P1 HWP2 Fig.1. Optical layout of the HA1. te: The optical layout drawing does not reflect the actual positions or number of optical components it is simplified for easier understanding. Half wave plate (HWP2) is adjusted automatically. P2 transmission in 5 90 % range at 12 mm position of HA1 H300A1 Smooth adjustment of output pulse energy without change of other pulse parameters 6 1 H300A1 6 Savanoriu AV. 237, lt Vilnius, Lithuania tel sales@ekspla.com rev

7 HA2 attenuator at When HSH & Fig.1. Optical layout of the HA2. te: The optical layout drawing does not reflect the actual positions or number of optical components it is simplified for easier understanding. Half wave plate (HWP is adjusted automatically. residual transmission in 5 90 % range at 12 mm HA3 attenuator at When HTH or HSTH. 1064, 532 & HWP1 HWP1 Fig.1. Optical layout of the HA3. te: The optical layout drawing does not reflect the actual positions or number of optical components it is simplified for easier understanding. Half wave plate (HWP is adjusted automatically. P1 P2 P1 P2 position of HA2 residual transmission in 5 90 % range at 12 mm Residual Residual and output port position of HA3 H300A2 H300A3 Smooth adjustment of output pulse energy without change of other pulse parameters 6 Smooth adjustment of output pulse energy without change of other pulse parameters 6 H300A2 H300A High Energy Lasers Nanosecond Tunable Lasers rev Savanoriu AV. 237, lt Vilnius, Lithuania tel sales@ekspla.com 69