H-SMART technical details

H-SMART is stand-alone automated harmonic generator module designed to be used with our Q2 and Q2HE series lasers. Module is intended to be mounted side-by-side with laser on common optical table or breadboard.
H-SMART has three exit ports that can be factory-configured to emit up to 5th harmonic wavelengths. Most common exit port standard configurations are listed in the “Exit port configuration options” table below. Custom configurations are available by request.

Specifications ¹⁾

Model	H-SMART
Conversion efficiency 2)
Fundamental to second harmonic	> 50 %
Fundamental to third harmonic	> 30 %
Fundamental to fourth harmonic	> 15 %
Fundamental to fifth harmonic	> 6 %
Pulse to pulse energy stability @ 3)
526.5/532 nm	<2.5 % RMS
351/355 nm	<3.5 % RMS
263/266 nm	<4 % RMS
211/213 nm	<5 % RMS
Spectral purity for Port #1 4)	>99%
Typical pulse duration	10-20% shorter in each conversion stage
Typical beam diameter	10-30 % smaller than pump beam
Beam pointing stability	same as of pump beam
Dimensions
Harmonic generator (W×L×H)	160× 270× 141 mm3
Weight	<5 kg
Operating requirements
Ambient temperature	15 – 30 ºC
Relative humidity	10 – 80 % (non-condensing)
Powering	12 VDC 5)
Average power consumption	<20 W

Exit ports configuration options

H-SMART-	Port #1			Port #2	Port #3
	WL 7)	AT 8)	EM 9)	WL 7)	WL 7)
SH	532 nm	-AT2	-EM2	1064 nm 10)	N/A
SH/SP	532/1064 nm selectable	-AT	-EM/BB	N/A	N/A
SH-AT1	1064 nm	build-in	-EM1	532 nm 10)	N/A
SH-AT2	532 nm	build-in	-EM2	1064 nm 10)	N/A
TH	355 nm	-AT3	-EM3	532&1064 nm 11)	N/A
TH-2P	355 nm	-AT3	-EM3	532&1064 nm 11)	N/A
TH-AT1	355 nm	-AT3	-EM3	532 nm 10)	N/A
TH-3P	1064 nm	build-in	build-in	532 nm 10)	355 nm 10)
TH/SP	355/532/1064 nm selectable	build-in	-EM/BB	N/A	N/A
TH/OPO	355/1064 nm selectable	build-in	-EM/BB	532 nm 10)	N/A
FH	266 nm	-AT4	-EM4	532&1064 nm 11)	N/A
FH-1P	266 nm	-AT4	-EM4	N/A	N/A
FH-2P	266 nm	-AT4	-EM4	532&1064 nm 11)	N/A
FH-AT1	266 nm	-AT4	-EM4	532 nm10)	N/A
FH-3P	1064 nm	build-in	build-in	532 nm10)	266 nm 10)
FH/SP	266/532/1064 nm selectable	build-in	-EM/BB	N/A	N/A
SH/TH/FH-3P	355 nm	-AT3	-EM3	532&1064 nm 11)	266 nm 10)
SH/TH/FH-2P	266/355 nm selectable	N/A	-EM/BB	532&1064 nm 11)	N/A
SH/TH/FH-UN	266&355&532& 1064 nm	buil-in	N/A	N/A	N/A
FiH	213 nm 12)	-AT5	-EM5	N/A	N/A
FiH/FH	213/266 nm selectable 12)	N/A	-EM/BB	N/A	N/A

H-SMART flexible design and microprocessor controlled operation enabled us to implement number of advanced features:
Single output port – motorized selection of required wavelength, emitted trough the same exit aperture.
Self-tuning – automatic, microprocessor controlled tuning of non-linear crystal temperatures for maximum pulse energy.
Monitoring – monitoring of pulse energy at fundamental or harmonic wavelength.
Bypass – laser fundamental beam can bypass H-SMART with minimal losses on internal optical components.
Attenuation – ability to attenuate output pulse energies without change of laser pump energy, helping to minimize changes to beam profile and pulse duration.
Enhanced spectral purity– improved to 99.9% spectral purity of exit wavelengths.
“Features” table below summarizes features of each model and available extensions.

Features

H-SMART-	No. of exits	Self-tuning	Monitoring	Bypass	Attenuation	Enhanced spectral purity
SH	2	optional	optional	–	optional	–
SH/SP	1	√	√	√	optional	–
SH-AT1	2	optional	optional	√	√	–
SH-AT2	2	optional	optional	–	√	–
TH	2	optional	optional	–	optional	–
TH-2P	2	√	√	–	optional	–
TH-AT1	2	√	optional	–	√	–
TH-3P	3	√	optional	√	√	–
TH/SP	1	√	optional	–	√	–
TH/OPO	2	√	√	√	√	–
FH	2	optional	optional	–	optional	–
FH-1P	1	√	optional	–	optional	√
FH-2P	2	√	√	–	optional	–
FH-AT1	2	√	√	–	√	–
FH-3P	3	√	√	√	√	–
FH/SP	1	√	optional	–	√	√
SH/TH/FH-3P	3	√	√	–	optional	–
SH/TH/FH-2P	2	√	√	–	optional	–
SH/TH/FH-UN	1	–	–	–	√	–
FiH	1	√	optional	–	optional	√
FiH/FH	1	√	optional	–	–	√

1. Due to continuous improvements all specifications are subject to change. The parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture.
2. Conversion efficiency presented here is for Port #1. Conversion efficiency at Port #2 or Port #3 depends on unit configuration and typically are lower than presented here. Please inquire for details.
3. When unit is pumped by our Q2 or Q2HE series laser. Measured during 30 seconds operation after warm-up.
4. Spectral purity at Port #2 or Port #3 could not be specified for two-wavelength output configuration.
5. When supplied with Q2 or Q2HE laser, H-SMART is powered from laser controller.
6. See Figure 1 below for port number assignment.
7. Wavelength is shown for 1064 nm pump wavelength. For 1053 nm pump wavelength recalculate wavelengths accordingly.
8. Shows compatible attenuator model. This option is available only when H-SMART is supplied together with Q2 or Q2HE series laser.
9. Shows compatible pulse energy monitor model. This option is available only when H-SMART is supplied together with Q2 or Q2HE series laser.
10. Spectral purity is >98 %.
11. Both wavelengths exit Port #2, for separation external dichroic mirror is required.
12. Spectral purity for this model is >99.9%.

When supplied together with QLI lasers, status of H-SMART can be remotely monitored and controlled from laser control panel (PC is required). Alternatively, control is possible directly via build-in Ethernet interface.
Most of high performance birefringent crystals are hygroscopic, which might limit their lifetime in humid environment. However, if they are continuously kept at higher than ambient temperatures, the lifetime of crystals can be significantly extended and can be even longer than laser system itself. To keep crystals dry, H-SMART module needs to be always connected to the power source. If power is not available, the module should be stored in dry environment.

Figure 1. H-SMART harmonic generator port number assignment