diff --git a/book/book.toml b/book/book.toml
index 26729c594dcb9a146e0abf3731c2046ecfe77322..4713fc5dadc9c4c89e364c52aeb8d8d2dd29d6d0 100644
--- a/book/book.toml
+++ b/book/book.toml
@@ -4,3 +4,7 @@ language = "en"
 multilingual = false
 src = "src"
 title = "OPOSSUM Handbook"
+
+
+[preprocessor.katex]
+after = ["links"]
diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md
index be71ce9073c830045bc62273178d1fc4df26adaf..d477b8dda438e559f9a358e30468ab756e7202cf 100644
--- a/book/src/SUMMARY.md
+++ b/book/src/SUMMARY.md
@@ -4,10 +4,11 @@
   - [Goals](./goals.md)
   - [Project plan](./plan.md)
 - [Existing Software](./existing_software.md)
-- [Modelling optical systems](./optical_model.md)
+- [Modeling optical systems](./optical_model.md)
   - [Nodes](./nodes.md)
   - [Edges](./edges.md)
   - [Materials](./materials.md)
+  - [Physical processes, Subsystems and Components](./optical_components_effects.md)
 - [Model analysis](./model_analysis.md)
   - [Analyzers](./analyzers.md)
   - [Interfacing with external code](./interfacing.md)
diff --git a/book/src/optical_components_effects.md b/book/src/optical_components_effects.md
new file mode 100644
index 0000000000000000000000000000000000000000..740260c3c76b9f24d61d087417a881565fe8fa61
--- /dev/null
+++ b/book/src/optical_components_effects.md
@@ -0,0 +1,15 @@
+# Subsystems and Components
+
+Modern laser systems are composed of a large number of optical subsystems and individual optical components. For a holistic description of such a system, all these optical components and the structures that are built from these must be modeled. Furthermore, a numerous amount of physical effects/processes must be included to create a realistic view of the full system.
+
+In the following, a, probably not complete, list of relevant effects/processes, subsystems and components for high-intensity lasers will be compiled. 
+
+## Physical Effects/Processes
+### Second-order nonlinear effects
+Second-order nonlinear effects include all processes that result from the response of the second-order susceptibility $\chi^{(2)}$:
+* Second-Harmonic Generation (SHG)
+* Sum-Frequency Generation (SFG)
+* Difference-Frequency Generation (DFG)
+* Optical Rectification (OR)
+* Optical Parametric Amplification (OPA)
+
diff --git a/src/optic_node.rs b/src/optic_node.rs
index 62a28f24fc047768d03545aae1494ad8319cde47..e753cc7843f23952d71dfc99554893006b96e130 100644
--- a/src/optic_node.rs
+++ b/src/optic_node.rs
@@ -18,7 +18,7 @@ impl OpticNode {
     /// use opossum::optic_node::OpticNode;
     /// use opossum::nodes::NodeDummy;
     ///
-    /// let node=OpticNode::new("My node", Box::new(NodeDummy));
+    /// let node=OpticNode::new("My node", NodeDummy);
     /// ```
     pub fn new<T: Optical+ 'static>(name: &str, node_type: T) -> Self {
         let ports=node_type.ports();